Convert numerous UNIQUE INDEX to PRIMARY KEY

[lhc/web/wiklou.git] / maintenance / mssql / tables.sql

-- Experimental table definitions for Microsoft SQL Server with
-- content-holding fields switched to explicit BINARY charset.
-- ------------------------------------------------------------

-- SQL to create the initial tables for the MediaWiki database.
-- This is read and executed by the install script; you should
-- not have to run it by itself unless doing a manual install.

--
-- General notes:
--
-- The comments in this and other files are
-- replaced with the defined table prefix by the installer
-- and updater scripts. If you are installing or running
-- updates manually, you will need to manually insert the
-- table prefix if any when running these scripts.
--


--
-- The user table contains basic account information,
-- authentication keys, etc.
--
-- Some multi-wiki sites may share a single central user table
-- between separate wikis using the $wgSharedDB setting.
--
-- Note that when a external authentication plugin is used,
-- user table entries still need to be created to store
-- preferences and to key tracking information in the other
-- tables.

-- LINE:53
CREATE TABLE /*_*/mwuser (
   user_id           INT           NOT NULL  PRIMARY KEY IDENTITY(0,1),
   user_name         NVARCHAR(255)  NOT NULL UNIQUE DEFAULT '',
   user_real_name    NVARCHAR(255)  NOT NULL DEFAULT '',
   user_password     NVARCHAR(255)  NOT NULL DEFAULT '',
   user_newpassword  NVARCHAR(255)  NOT NULL DEFAULT '',
   user_newpass_time varchar(14) NULL DEFAULT NULL,
   user_email        NVARCHAR(255)  NOT NULL DEFAULT '',
   user_touched      varchar(14)      NOT NULL DEFAULT '',
   user_token        NCHAR(32)      NOT NULL DEFAULT '',
   user_email_authenticated varchar(14) DEFAULT NULL,
   user_email_token  NCHAR(32) DEFAULT '',
   user_email_token_expires varchar(14) DEFAULT NULL,
   user_registration varchar(14) DEFAULT NULL,
   user_editcount    INT NULL DEFAULT NULL,
   user_password_expires varchar(14) DEFAULT NULL
);
CREATE UNIQUE INDEX /*i*/user_name ON /*_*/mwuser (user_name);
CREATE INDEX /*i*/user_email_token ON /*_*/mwuser (user_email_token);
CREATE INDEX /*i*/user_email ON /*_*/mwuser (user_email);

-- Insert a dummy user to represent anons
INSERT INTO /*_*/mwuser (user_name) VALUES ('##Anonymous##');

--
-- The "actor" table associates user names or IP addresses with integers for
-- the benefit of other tables that need to refer to either logged-in or
-- logged-out users. If something can only ever be done by logged-in users, it
-- can refer to the user table directly.
--
CREATE TABLE /*_*/actor (
  actor_id bigint unsigned NOT NULL CONSTRAINT PK_actor PRIMARY KEY IDENTITY(0,1),
  actor_user int unsigned,
  actor_name nvarchar(255) NOT NULL
);
CREATE UNIQUE INDEX /*i*/actor_user ON /*_*/actor (actor_user);
CREATE UNIQUE INDEX /*i*/actor_name ON /*_*/actor (actor_name);

-- Insert a dummy actor to represent no actor
INSERT INTO /*_*/actor (actor_name) VALUES ('##Anonymous##');

--
-- User permissions have been broken out to a separate table;
-- this allows sites with a shared user table to have different
-- permissions assigned to a user in each project.
--
-- This table replaces the old user_rights field which used a
-- comma-separated nvarchar(max).
CREATE TABLE /*_*/user_groups (
   ug_user  INT     NOT NULL REFERENCES /*_*/mwuser(user_id) ON DELETE CASCADE,
   ug_group NVARCHAR(255) NOT NULL DEFAULT '',
   ug_expiry varchar(14) DEFAULT NULL,
   PRIMARY KEY(ug_user, ug_group)
);
CREATE INDEX /*i*/ug_group ON /*_*/user_groups(ug_group);
CREATE INDEX /*i*/ug_expiry ON /*_*/user_groups(ug_expiry);

-- Stores the groups the user has once belonged to.
-- The user may still belong to these groups (check user_groups).
-- Users are not autopromoted to groups from which they were removed.
CREATE TABLE /*_*/user_former_groups (
  ufg_user INT NOT NULL REFERENCES /*_*/mwuser(user_id) ON DELETE CASCADE,
  ufg_group nvarchar(255) NOT NULL default ''
);
CREATE UNIQUE INDEX /*i*/ufg_user_group ON /*_*/user_former_groups (ufg_user,ufg_group);

-- Stores notifications of user talk page changes, for the display
-- of the "you have new messages" box
-- Changed user_id column to user_id to avoid clashing with user_id function
CREATE TABLE /*_*/user_newtalk (
   user_id INT         NOT NULL REFERENCES /*_*/mwuser(user_id) ON DELETE CASCADE,
   user_ip NVARCHAR(40) NOT NULL DEFAULT '',
   user_last_timestamp varchar(14) DEFAULT NULL,
);
CREATE INDEX /*i*/un_user_id ON /*_*/user_newtalk (user_id);
CREATE INDEX /*i*/un_user_ip ON /*_*/user_newtalk (user_ip);

--
-- User preferences and other fun stuff
-- replaces old user.user_options nvarchar(max)
--
CREATE TABLE /*_*/user_properties (
        up_user INT NOT NULL REFERENCES /*_*/mwuser(user_id) ON DELETE CASCADE,
        up_property NVARCHAR(255) NOT NULL,
        up_value NVARCHAR(MAX),
);
CREATE UNIQUE CLUSTERED INDEX /*i*/user_properties_user_property ON /*_*/user_properties (up_user,up_property);
CREATE INDEX /*i*/user_properties_property ON /*_*/user_properties (up_property);

--
-- This table contains a user's bot passwords: passwords that allow access to
-- the account via the API with limited rights.
--
CREATE TABLE /*_*/bot_passwords (
        bp_user int NOT NULL REFERENCES /*_*/mwuser(user_id) ON DELETE CASCADE,
        bp_app_id nvarchar(32) NOT NULL,
        bp_password nvarchar(255) NOT NULL,
        bp_token nvarchar(255) NOT NULL,
        bp_restrictions nvarchar(max) NOT NULL,
        bp_grants nvarchar(max) NOT NULL,
        PRIMARY KEY (bp_user, bp_app_id)
);


--
-- Edits, blocks, and other actions typically have a textual comment describing
-- the action. They are stored here to reduce the size of the main tables, and
-- to allow for deduplication.
--
-- Deduplication is currently best-effort to avoid locking on inserts that
-- would be required for strict deduplication. There MAY be multiple rows with
-- the same comment_text and comment_data.
--
CREATE TABLE /*_*/comment (
  comment_id bigint unsigned NOT NULL PRIMARY KEY IDENTITY(0,1),
  comment_hash INT NOT NULL,
  comment_text nvarchar(max) NOT NULL,
  comment_data nvarchar(max)
);
-- Index used for deduplication.
CREATE INDEX /*i*/comment_hash ON /*_*/comment (comment_hash);

-- dummy row for FKs. Hash is intentionally wrong so CommentStore won't match it.
INSERT INTO /*_*/comment (comment_hash, comment_text) VALUES (-1, '** dummy **');


--
-- Core of the wiki: each page has an entry here which identifies
-- it by title and contains some essential metadata.
--
CREATE TABLE /*_*/page (
   page_id        INT          NOT NULL  PRIMARY KEY IDENTITY(0,1),
   page_namespace INT          NOT NULL,
   page_title     NVARCHAR(255)  NOT NULL,
   page_restrictions NVARCHAR(255) NOT NULL,
   page_is_redirect BIT           NOT NULL DEFAULT 0,
   page_is_new BIT                NOT NULL DEFAULT 0,
   page_random real     NOT NULL DEFAULT RAND(),
   page_touched varchar(14) NOT NULL default '',
   page_links_updated varchar(14) DEFAULT NULL,
   page_latest INT, -- FK inserted later
   page_len INT NOT NULL,
   page_content_model nvarchar(32) default null,
   page_lang VARBINARY(35) DEFAULT NULL
);
CREATE UNIQUE INDEX /*i*/name_title ON /*_*/page (page_namespace,page_title);
CREATE INDEX /*i*/page_random ON /*_*/page (page_random);
CREATE INDEX /*i*/page_len ON /*_*/page (page_len);
CREATE INDEX /*i*/page_redirect_namespace_len ON /*_*/page (page_is_redirect, page_namespace, page_len);

-- insert a dummy page
INSERT INTO /*_*/page (page_namespace, page_title, page_restrictions, page_latest, page_len) VALUES (-1,'','',0,0);

--
-- Every edit of a page creates also a revision row.
-- This stores metadata about the revision, and a reference
-- to the TEXT storage backend.
--
CREATE TABLE /*_*/revision (
   rev_id INT NOT NULL UNIQUE IDENTITY(0,1),
   rev_page INT NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,
   rev_text_id INT NOT NULL CONSTRAINT DF_rev_text_id DEFAULT 0, -- FK added later
   rev_comment NVARCHAR(255) NOT NULL CONSTRAINT DF_rev_comment DEFAULT '',
   rev_user INT REFERENCES /*_*/mwuser(user_id) ON DELETE SET NULL,
   rev_user_text NVARCHAR(255) NOT NULL DEFAULT '',
   rev_timestamp varchar(14) NOT NULL default '',
   rev_minor_edit BIT NOT NULL DEFAULT 0,
   rev_deleted TINYINT  NOT NULL DEFAULT 0,
   rev_len INT,
   rev_parent_id INT DEFAULT NULL REFERENCES /*_*/revision(rev_id),
   rev_sha1 nvarchar(32) not null default '',
   rev_content_model nvarchar(32) default null,
   rev_content_format nvarchar(64) default null
);
CREATE UNIQUE CLUSTERED INDEX /*i*/rev_page_id ON /*_*/revision (rev_page, rev_id);
CREATE INDEX /*i*/rev_timestamp ON /*_*/revision (rev_timestamp);
CREATE INDEX /*i*/page_timestamp ON /*_*/revision (rev_page,rev_timestamp);
CREATE INDEX /*i*/user_timestamp ON /*_*/revision (rev_user,rev_timestamp);
CREATE INDEX /*i*/usertext_timestamp ON /*_*/revision (rev_user_text,rev_timestamp);
CREATE INDEX /*i*/page_user_timestamp ON /*_*/revision (rev_page,rev_user,rev_timestamp);

-- insert a dummy revision
INSERT INTO /*_*/revision (rev_page,rev_text_id,rev_comment,rev_user,rev_len) VALUES (0,0,'',0,0);

ALTER TABLE /*_*/page ADD CONSTRAINT FK_page_latest_page_id FOREIGN KEY (page_latest) REFERENCES /*_*/revision(rev_id);

--
-- Temporary tables to avoid blocking on an alter of revision.
--
-- On large wikis like the English Wikipedia, altering the revision table is a
-- months-long process. This table is being created to avoid such an alter, and
-- will be merged back into revision in the future.
--
CREATE TABLE /*_*/revision_comment_temp (
  revcomment_rev INT NOT NULL CONSTRAINT FK_revcomment_rev FOREIGN KEY REFERENCES /*_*/revision(rev_id) ON DELETE CASCADE,
  revcomment_comment_id bigint unsigned NOT NULL CONSTRAINT FK_revcomment_comment_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),
  CONSTRAINT PK_revision_comment_temp PRIMARY KEY (revcomment_rev, revcomment_comment_id)
);
CREATE UNIQUE INDEX /*i*/revcomment_rev ON /*_*/revision_comment_temp (revcomment_rev);

CREATE TABLE /*_*/revision_actor_temp (
  revactor_rev int unsigned NOT NULL CONSTRAINT FK_revactor_rev FOREIGN KEY REFERENCES /*_*/revision(rev_id) ON DELETE CASCADE,
  revactor_actor bigint unsigned NOT NULL,
  revactor_timestamp varchar(14) NOT NULL CONSTRAINT DF_revactor_timestamp DEFAULT '',
  revactor_page int unsigned NOT NULL,
  CONSTRAINT PK_revision_actor_temp PRIMARY KEY (revactor_rev, revactor_actor)
);
CREATE UNIQUE INDEX /*i*/revactor_rev ON /*_*/revision_actor_temp (revactor_rev);
CREATE INDEX /*i*/actor_timestamp ON /*_*/revision_actor_temp (revactor_actor,revactor_timestamp);
CREATE INDEX /*i*/page_actor_timestamp ON /*_*/revision_actor_temp (revactor_page,revactor_actor,revactor_timestamp);

--
-- Holds TEXT of individual page revisions.
--
-- Field names are a holdover from the 'old' revisions table in
-- MediaWiki 1.4 and earlier: an upgrade will transform that
-- table INTo the 'text' table to minimize unnecessary churning
-- and downtime. If upgrading, the other fields will be left unused.
CREATE TABLE /*_*/text (
   old_id INT NOT NULL  PRIMARY KEY IDENTITY(0,1),
   old_text nvarchar(max) NOT NULL,
   old_flags NVARCHAR(255) NOT NULL,
);

-- insert a dummy text
INSERT INTO /*_*/text (old_text,old_flags) VALUES ('','');

ALTER TABLE /*_*/revision ADD CONSTRAINT FK_rev_text_id_old_id FOREIGN KEY (rev_text_id) REFERENCES /*_*/text(old_id) ON DELETE CASCADE;

--
-- Holding area for deleted articles, which may be viewed
-- or restored by admins through the Special:Undelete interface.
-- The fields generally correspond to the page, revision, and text
-- fields, with several caveats.
-- Cannot reasonably create views on this table, due to the presence of TEXT
-- columns.
CREATE TABLE /*_*/archive (
   ar_id int NOT NULL PRIMARY KEY IDENTITY,
   ar_namespace SMALLINT NOT NULL DEFAULT 0,
   ar_title NVARCHAR(255) NOT NULL DEFAULT '',
   ar_comment NVARCHAR(255) NOT NULL CONSTRAINT DF_ar_comment DEFAULT '',
   ar_comment_id bigint unsigned NOT NULL CONSTRAINT DF_ar_comment_id DEFAULT 0 CONSTRAINT FK_ar_comment_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),
   ar_user INT CONSTRAINT ar_user__user_id__fk FOREIGN KEY REFERENCES /*_*/mwuser(user_id),
   ar_user_text NVARCHAR(255) NOT NULL CONSTRAINT DF_ar_user_text DEFAULT '',
   ar_actor bigint unsigned NOT NULL CONSTRAINT DF_ar_actor DEFAULT 0,
   ar_timestamp varchar(14) NOT NULL default '',
   ar_minor_edit BIT NOT NULL DEFAULT 0,
   ar_rev_id INT NOT NULL, -- NOT a FK, the row gets deleted from revision and moved here
   ar_text_id INT NOT NULL CONSTRAINT DF_ar_text_id DEFAULT 0 CONSTRAINT ar_text_id__old_id__fk FOREIGN KEY REFERENCES /*_*/text(old_id) ON DELETE CASCADE,
   ar_deleted TINYINT NOT NULL DEFAULT 0,
   ar_len INT,
   ar_page_id INT NULL, -- NOT a FK, the row gets deleted from page and moved here
   ar_parent_id INT NULL, -- NOT FK
   ar_sha1 nvarchar(32) default null,
   ar_content_model nvarchar(32) DEFAULT NULL,
  ar_content_format nvarchar(64) DEFAULT NULL
);
CREATE INDEX /*i*/name_title_timestamp ON /*_*/archive (ar_namespace,ar_title,ar_timestamp);
CREATE INDEX /*i*/ar_usertext_timestamp ON /*_*/archive (ar_user_text,ar_timestamp);
CREATE INDEX /*i*/ar_actor_timestamp ON /*_*/archive (ar_actor,ar_timestamp);
CREATE UNIQUE INDEX /*i*/ar_revid_uniq ON /*_*/archive (ar_rev_id);


--
-- Slots represent an n:m relation between revisions and content objects.
-- A content object can have a specific "role" in one or more revisions.
-- Each revision can have multiple content objects, each having a different role.
--
CREATE TABLE /*_*/slots (

  -- reference to rev_id
  slot_revision_id bigint unsigned NOT NULL,

  -- reference to role_id
  slot_role_id smallint unsigned NOT NULL CONSTRAINT FK_slots_slot_role FOREIGN KEY REFERENCES slot_roles(role_id),

  -- reference to content_id
  slot_content_id bigint unsigned NOT NULL CONSTRAINT FK_slots_content_id FOREIGN KEY REFERENCES content(content_id),

  -- The revision ID of the revision that originated the slot's content.
  -- To find revisions that changed slots, look for slot_origin = slot_revision_id.
  slot_origin bigint NOT NULL,

  CONSTRAINT PK_slots PRIMARY KEY (slot_revision_id, slot_role_id)
);

-- Index for finding revisions that modified a specific slot
CREATE INDEX /*i*/slot_revision_origin_role ON /*_*/slots (slot_revision_id, slot_origin, slot_role_id);

--
-- The content table represents content objects. It's primary purpose is to provide the necessary
-- meta-data for loading and interpreting a serialized data blob to create a content object.
--
CREATE TABLE /*_*/content (

  -- ID of the content object
  content_id bigint unsigned NOT NULL CONSTRAINT PK_content PRIMARY KEY IDENTITY,

  -- Nominal size of the content object (not necessarily of the serialized blob)
  content_size int unsigned NOT NULL,

  -- Nominal hash of the content object (not necessarily of the serialized blob)
  content_sha1 varchar(32) NOT NULL,

  -- reference to model_id
  content_model smallint unsigned NOT NULL CONSTRAINT FK_content_content_models FOREIGN KEY REFERENCES /*_*/content_models(model_id),

  -- URL-like address of the content blob
  content_address nvarchar(255) NOT NULL
);

--
-- Normalization table for role names
--
CREATE TABLE /*_*/slot_roles (
  role_id smallint NOT NULL CONSTRAINT PK_slot_roles PRIMARY KEY IDENTITY,
  role_name nvarchar(64) NOT NULL
);

-- Index for looking of the internal ID of for a name
CREATE UNIQUE INDEX /*i*/role_name ON /*_*/slot_roles (role_name);

--
-- Normalization table for content model names
--
CREATE TABLE /*_*/content_models (
  model_id smallint NOT NULL CONSTRAINT PK_content_models PRIMARY KEY IDENTITY,
  model_name nvarchar(64) NOT NULL
);

-- Index for looking of the internal ID of for a name
CREATE UNIQUE INDEX /*i*/model_name ON /*_*/content_models (model_name);


--
-- Track page-to-page hyperlinks within the wiki.
--
CREATE TABLE /*_*/pagelinks (
   pl_from INT NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,
   pl_from_namespace int NOT NULL DEFAULT 0,
   pl_namespace INT NOT NULL DEFAULT 0,
   pl_title NVARCHAR(255) NOT NULL DEFAULT '',
);
CREATE UNIQUE INDEX /*i*/pl_from ON /*_*/pagelinks (pl_from,pl_namespace,pl_title);
CREATE UNIQUE INDEX /*i*/pl_namespace ON /*_*/pagelinks (pl_namespace,pl_title,pl_from);
CREATE INDEX /*i*/pl_backlinks_namespace ON /*_*/pagelinks (pl_from_namespace,pl_namespace,pl_title,pl_from);


--
-- Track template inclusions.
--
CREATE TABLE /*_*/templatelinks (
  tl_from int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,
  tl_from_namespace int NOT NULL default 0,
  tl_namespace int NOT NULL default 0,
  tl_title nvarchar(255) NOT NULL default ''
);

CREATE UNIQUE INDEX /*i*/tl_from ON /*_*/templatelinks (tl_from,tl_namespace,tl_title);
CREATE UNIQUE INDEX /*i*/tl_namespace ON /*_*/templatelinks (tl_namespace,tl_title,tl_from);
CREATE INDEX /*i*/tl_backlinks_namespace ON /*_*/templatelinks (tl_from_namespace,tl_namespace,tl_title,tl_from);


--
-- Track links to images *used inline*
-- We don't distinguish live from broken links here, so
-- they do not need to be changed on upload/removal.
--
CREATE TABLE /*_*/imagelinks (
  -- Key to page_id of the page containing the image / media link.
  il_from int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,
  il_from_namespace int NOT NULL default 0,

  -- Filename of target image.
  -- This is also the page_title of the file's description page;
  -- all such pages are in namespace 6 (NS_FILE).
  il_to nvarchar(255) NOT NULL default ''
);

CREATE UNIQUE INDEX /*i*/il_from ON /*_*/imagelinks (il_from,il_to);
CREATE UNIQUE INDEX /*i*/il_to ON /*_*/imagelinks (il_to,il_from);
CREATE INDEX /*i*/il_backlinks_namespace ON /*_*/imagelinks (il_from_namespace,il_to,il_from);

--
-- Track category inclusions *used inline*
-- This tracks a single level of category membership
--
CREATE TABLE /*_*/categorylinks (
  -- Key to page_id of the page defined as a category member.
  cl_from int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,

  -- Name of the category.
  -- This is also the page_title of the category's description page;
  -- all such pages are in namespace 14 (NS_CATEGORY).
  cl_to nvarchar(255) NOT NULL default '',

  -- A binary string obtained by applying a sortkey generation algorithm
  -- (Collation::getSortKey()) to page_title, or cl_sortkey_prefix . "\n"
  -- . page_title if cl_sortkey_prefix is nonempty.
  cl_sortkey varbinary(230) NOT NULL default 0x,

  -- A prefix for the raw sortkey manually specified by the user, either via
  -- [[Category:Foo|prefix]] or {{defaultsort:prefix}}.  If nonempty, it's
  -- concatenated with a line break followed by the page title before the sortkey
  -- conversion algorithm is run.  We store this so that we can update
  -- collations without reparsing all pages.
  -- Note: If you change the length of this field, you also need to change
  -- code in LinksUpdate.php. See T27254.
  cl_sortkey_prefix varbinary(255) NOT NULL default 0x,

  -- This isn't really used at present. Provided for an optional
  -- sorting method by approximate addition time.
  cl_timestamp varchar(14) NOT NULL,

  -- Stores $wgCategoryCollation at the time cl_sortkey was generated.  This
  -- can be used to install new collation versions, tracking which rows are not
  -- yet updated.  '' means no collation, this is a legacy row that needs to be
  -- updated by updateCollation.php.  In the future, it might be possible to
  -- specify different collations per category.
  cl_collation nvarchar(32) NOT NULL default '',

  -- Stores whether cl_from is a category, file, or other page, so we can
  -- paginate the three categories separately.  This never has to be updated
  -- after the page is created, since none of these page types can be moved to
  -- any other.
  cl_type varchar(10) NOT NULL default 'page',
  -- SQL server doesn't have enums, so we approximate with this
  CONSTRAINT cl_type_ckc CHECK (cl_type IN('page', 'subcat', 'file'))
);

CREATE UNIQUE INDEX /*i*/cl_from ON /*_*/categorylinks (cl_from,cl_to);

-- We always sort within a given category, and within a given type.  FIXME:
-- Formerly this index didn't cover cl_type (since that didn't exist), so old
-- callers won't be using an index: fix this?
CREATE INDEX /*i*/cl_sortkey ON /*_*/categorylinks (cl_to,cl_type,cl_sortkey,cl_from);

-- Used by the API (and some extensions)
CREATE INDEX /*i*/cl_timestamp ON /*_*/categorylinks (cl_to,cl_timestamp);

-- Used when updating collation (e.g. updateCollation.php)
CREATE INDEX /*i*/cl_collation_ext ON /*_*/categorylinks (cl_collation, cl_to, cl_type, cl_from);

--
-- Track all existing categories. Something is a category if 1) it has an entry
-- somewhere in categorylinks, or 2) it has a description page. Categories
-- might not have corresponding pages, so they need to be tracked separately.
--
CREATE TABLE /*_*/category (
  -- Primary key
  cat_id int NOT NULL PRIMARY KEY IDENTITY,

  -- Name of the category, in the same form as page_title (with underscores).
  -- If there is a category page corresponding to this category, by definition,
  -- it has this name (in the Category namespace).
  cat_title nvarchar(255) NOT NULL,

  -- The numbers of member pages (including categories and media), subcatego-
  -- ries, and Image: namespace members, respectively.  These are signed to
  -- make underflow more obvious.  We make the first number include the second
  -- two for better sorting: subtracting for display is easy, adding for order-
  -- ing is not.
  cat_pages int NOT NULL default 0,
  cat_subcats int NOT NULL default 0,
  cat_files int NOT NULL default 0
);

CREATE UNIQUE INDEX /*i*/cat_title ON /*_*/category (cat_title);

-- For Special:Mostlinkedcategories
CREATE INDEX /*i*/cat_pages ON /*_*/category (cat_pages);


--
-- Table defining tag names for IDs. Also stores hit counts to avoid expensive queries on change_tag
--
CREATE TABLE /*_*/change_tag_def (
    -- Numerical ID of the tag (ct_tag_id refers to this)
    ctd_id int NOT NULL CONSTRAINT PK_change_tag_def PRIMARY KEY IDENTITY,
    -- Symbolic name of the tag (what would previously be put in ct_tag)
    ctd_name nvarchar(255) NOT NULL,
    -- Whether this tag was defined manually by a privileged user using Special:Tags
    ctd_user_defined tinyint NOT NULL CONSTRAINT DF_ctd_user_defined DEFAULT 0,
    -- Number of times this tag was used
    ctd_count int NOT NULL CONSTRAINT DF_ctd_count DEFAULT 0
) /*$wgDBTableOptions*/;

CREATE UNIQUE INDEX /*i*/ctd_name ON /*_*/change_tag_def (ctd_name);
CREATE INDEX /*i*/ctd_count ON /*_*/change_tag_def (ctd_count);
CREATE INDEX /*i*/ctd_user_defined ON /*_*/change_tag_def (ctd_user_defined);

--
-- Track links to external URLs
--
CREATE TABLE /*_*/externallinks (
  -- Primary key
  el_id int NOT NULL PRIMARY KEY IDENTITY,

  -- page_id of the referring page
  el_from int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,

  -- The URL
  el_to nvarchar(max) NOT NULL,

  -- In the case of HTTP URLs, this is the URL with any username or password
  -- removed, and with the labels in the hostname reversed and converted to
  -- lower case. An extra dot is added to allow for matching of either
  -- example.com or *.example.com in a single scan.
  -- Example:
  --      http://user:password@sub.example.com/page.html
  --   becomes
  --      http://com.example.sub./page.html
  -- which allows for fast searching for all pages under example.com with the
  -- clause:
  --      WHERE el_index LIKE 'http://com.example.%'
  el_index nvarchar(450) NOT NULL,

  -- This is el_index truncated to 60 bytes to allow for sortable queries that
  -- aren't supported by a partial index.
  el_index_60 varbinary(60) NOT NULL
);

CREATE INDEX /*i*/el_from ON /*_*/externallinks (el_from);
CREATE INDEX /*i*/el_index ON /*_*/externallinks (el_index);
CREATE INDEX /*i*/el_index_60 ON /*_*/externallinks (el_index_60, el_id);
CREATE INDEX /*i*/el_from_index_60 ON /*_*/externallinks (el_from, el_index_60, el_id);
-- el_to index intentionally not added; we cannot index nvarchar(max) columns,
-- but we also cannot restrict el_to to a smaller column size as the external
-- link may be larger.

--
-- Track interlanguage links
--
CREATE TABLE /*_*/langlinks (
  -- page_id of the referring page
  ll_from int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,

  -- Language code of the target
  ll_lang nvarchar(20) NOT NULL default '',

  -- Title of the target, including namespace
  ll_title nvarchar(255) NOT NULL default ''
);

CREATE UNIQUE INDEX /*i*/ll_from ON /*_*/langlinks (ll_from, ll_lang);
CREATE INDEX /*i*/ll_lang ON /*_*/langlinks (ll_lang, ll_title);


--
-- Track inline interwiki links
--
CREATE TABLE /*_*/iwlinks (
  -- page_id of the referring page
  iwl_from int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,

  -- Interwiki prefix code of the target
  iwl_prefix nvarchar(20) NOT NULL default '',

  -- Title of the target, including namespace
  iwl_title nvarchar(255) NOT NULL default ''
);

CREATE UNIQUE INDEX /*i*/iwl_from ON /*_*/iwlinks (iwl_from, iwl_prefix, iwl_title);
CREATE INDEX /*i*/iwl_prefix_title_from ON /*_*/iwlinks (iwl_prefix, iwl_title, iwl_from);
CREATE INDEX /*i*/iwl_prefix_from_title ON /*_*/iwlinks (iwl_prefix, iwl_from, iwl_title);


--
-- Contains a single row with some aggregate info
-- on the state of the site.
--
CREATE TABLE /*_*/site_stats (
  -- The single row should contain 1 here.
  ss_row_id int NOT NULL CONSTRAINT /*i*/ss_row_id PRIMARY KEY,

  -- Total number of edits performed.
  ss_total_edits bigint default NULL,

  -- See SiteStatsInit::articles().
  ss_good_articles bigint default NULL,

  -- Total pages, theoretically equal to SELECT COUNT(*) FROM page.
  ss_total_pages bigint default NULL,

  -- Number of users, theoretically equal to SELECT COUNT(*) FROM user.
  ss_users bigint default NULL,

  -- Number of users that still edit.
  ss_active_users bigint default NULL,

  -- Number of images, equivalent to SELECT COUNT(*) FROM image.
  ss_images bigint default NULL
);


--
-- The internet is full of jerks, alas. Sometimes it's handy
-- to block a vandal or troll account.
--
CREATE TABLE /*_*/ipblocks (
  -- Primary key, introduced for privacy.
  ipb_id int NOT NULL PRIMARY KEY IDENTITY,

  -- Blocked IP address in dotted-quad form or user name.
  ipb_address nvarchar(255) NOT NULL,

  -- Blocked user ID or 0 for IP blocks.
  ipb_user int REFERENCES /*_*/mwuser(user_id),

  -- User ID who made the block.
  ipb_by int REFERENCES /*_*/mwuser(user_id) ON DELETE CASCADE,

  -- Actor ID who made the block.
  ipb_by_actor bigint unsigned NOT NULL CONSTRAINT DF_ipb_by_actor DEFAULT 0,

  -- User name of blocker
  ipb_by_text nvarchar(255) NOT NULL default '',

  -- Text comment made by blocker.
  ipb_reason nvarchar(255) NOT NULL CONSTRAINT DF_ipb_reason DEFAULT '',

  -- Key to comment_id. Text comment made by blocker.
  -- ("DEFAULT 0" is temporary, signaling that ipb_reason should be used)
  ipb_reason_id bigint unsigned NOT NULL CONSTRAINT DF_ipb_reason_id DEFAULT 0 CONSTRAINT FK_ipb_reason_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),

  -- Creation (or refresh) date in standard YMDHMS form.
  -- IP blocks expire automatically.
  ipb_timestamp varchar(14) NOT NULL default '',

  -- Indicates that the IP address was banned because a banned
  -- user accessed a page through it. If this is 1, ipb_address
  -- will be hidden, and the block identified by block ID number.
  ipb_auto bit NOT NULL default 0,

  -- If set to 1, block applies only to logged-out users
  ipb_anon_only bit NOT NULL default 0,

  -- Block prevents account creation from matching IP addresses
  ipb_create_account bit NOT NULL default 1,

  -- Block triggers autoblocks
  ipb_enable_autoblock bit NOT NULL default 1,

  -- Time at which the block will expire.
  -- May be "infinity"
  ipb_expiry varchar(14) NOT NULL,

  -- Start and end of an address range, in hexadecimal
  -- Size chosen to allow IPv6
  -- FIXME: these fields were originally blank for single-IP blocks,
  -- but now they are populated. No migration was ever done. They
  -- should be fixed to be blank again for such blocks (T51504).
  ipb_range_start varchar(255) NOT NULL,
  ipb_range_end varchar(255) NOT NULL,

  -- Flag for entries hidden from users and Sysops
  ipb_deleted bit NOT NULL default 0,

  -- Block prevents user from accessing Special:Emailuser
  ipb_block_email bit NOT NULL default 0,

  -- Block allows user to edit their own talk page
  ipb_allow_usertalk bit NOT NULL default 0,

  -- ID of the block that caused this block to exist
  -- Autoblocks set this to the original block
  -- so that the original block being deleted also
  -- deletes the autoblocks
  ipb_parent_block_id int default NULL REFERENCES /*_*/ipblocks(ipb_id)

);

-- Unique index to support "user already blocked" messages
-- Any new options which prevent collisions should be included
CREATE UNIQUE INDEX /*i*/ipb_address ON /*_*/ipblocks (ipb_address, ipb_user, ipb_auto, ipb_anon_only);

CREATE INDEX /*i*/ipb_user ON /*_*/ipblocks (ipb_user);
CREATE INDEX /*i*/ipb_range ON /*_*/ipblocks (ipb_range_start, ipb_range_end);
CREATE INDEX /*i*/ipb_timestamp ON /*_*/ipblocks (ipb_timestamp);
CREATE INDEX /*i*/ipb_expiry ON /*_*/ipblocks (ipb_expiry);
CREATE INDEX /*i*/ipb_parent_block_id ON /*_*/ipblocks (ipb_parent_block_id);


--
-- Uploaded images and other files.
--
CREATE TABLE /*_*/image (
  -- Filename.
  -- This is also the title of the associated description page,
  -- which will be in namespace 6 (NS_FILE).
  img_name nvarchar(255) NOT NULL default '' PRIMARY KEY,

  -- File size in bytes.
  img_size int NOT NULL default 0,

  -- For images, size in pixels.
  img_width int NOT NULL default 0,
  img_height int NOT NULL default 0,

  -- Extracted Exif metadata stored as a serialized PHP array.
  img_metadata varbinary(max) NOT NULL,

  -- For images, bits per pixel if known.
  img_bits int NOT NULL default 0,

  -- Media type as defined by the MEDIATYPE_xxx constants
  img_media_type varchar(16) default null,

  -- major part of a MIME media type as defined by IANA
  -- see https://www.iana.org/assignments/media-types/
  img_major_mime varchar(16) not null default 'unknown',

  -- minor part of a MIME media type as defined by IANA
  -- the minor parts are not required to adher to any standard
  -- but should be consistent throughout the database
  -- see https://www.iana.org/assignments/media-types/
  img_minor_mime nvarchar(100) NOT NULL default 'unknown',

  -- Description field as entered by the uploader.
  -- This is displayed in image upload history and logs.
  img_description nvarchar(255) NOT NULL CONSTRAINT DF_img_description DEFAULT '',
  img_description_id bigint NOT NULL CONSTRAINT DF_img_description_id DEFAULT 0 CONSTRAINT FK_img_description_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),

  -- user_id and user_name of uploader.
  img_user int REFERENCES /*_*/mwuser(user_id) ON DELETE SET NULL,
  img_user_text nvarchar(255) NOT NULL CONSTRAINT DF_img_user_text DEFAULT '',
  img_actor bigint unsigned NOT NULL CONSTRAINT DF_img_actor DEFAULT 0,

  -- Time of the upload.
  img_timestamp nvarchar(14) NOT NULL default '',

  -- SHA-1 content hash in base-36
  img_sha1 nvarchar(32) NOT NULL default '',

  CONSTRAINT img_major_mime_ckc check (img_major_mime IN('unknown', 'application', 'audio', 'image', 'text', 'video', 'message', 'model', 'multipart', 'chemical')),
  CONSTRAINT img_media_type_ckc check (img_media_type in('UNKNOWN', 'BITMAP', 'DRAWING', 'AUDIO', 'VIDEO', 'MULTIMEDIA', 'OFFICE', 'TEXT', 'EXECUTABLE', 'ARCHIVE','3D'))
);

CREATE INDEX /*i*/img_usertext_timestamp ON /*_*/image (img_user_text,img_timestamp);
CREATE INDEX /*i*/img_actor_timestamp ON /*_*/image (img_actor, img_timestamp);
-- Used by Special:ListFiles for sort-by-size
CREATE INDEX /*i*/img_size ON /*_*/image (img_size);
-- Used by Special:Newimages and Special:ListFiles
CREATE INDEX /*i*/img_timestamp ON /*_*/image (img_timestamp);
-- Used in API and duplicate search
CREATE INDEX /*i*/img_sha1 ON /*_*/image (img_sha1);
-- Used to get media of one type
CREATE INDEX /*i*/img_media_mime ON /*_*/image (img_media_type,img_major_mime,img_minor_mime);

--
-- Temporary table to avoid blocking on an alter of image.
--
-- On large wikis like Wikimedia Commons, altering the image table is a
-- months-long process. This table is being created to avoid such an alter, and
-- will be merged back into image in the future.
--
CREATE TABLE /*_*/image_comment_temp (
  imgcomment_name nvarchar(255) NOT NULL CONSTRAINT FK_imgcomment_name FOREIGN KEY REFERENCES /*_*/image(imgcomment_name) ON DELETE CASCADE,
  imgcomment_description_id bigint unsigned NOT NULL CONSTRAINT FK_imgcomment_description_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),
  CONSTRAINT PK_image_comment_temp PRIMARY KEY (imgcomment_name, imgcomment_description_id)
);
CREATE UNIQUE INDEX /*i*/imgcomment_name ON /*_*/image_comment_temp (imgcomment_name);


--
-- Previous revisions of uploaded files.
-- Awkwardly, image rows have to be moved into
-- this table at re-upload time.
--
CREATE TABLE /*_*/oldimage (
  -- Base filename: key to image.img_name
  -- Not a FK because deleting images removes them from image
  oi_name nvarchar(255) NOT NULL default '',

  -- Filename of the archived file.
  -- This is generally a timestamp and '!' prepended to the base name.
  oi_archive_name nvarchar(255) NOT NULL default '',

  -- Other fields as in image...
  oi_size int NOT NULL default 0,
  oi_width int NOT NULL default 0,
  oi_height int NOT NULL default 0,
  oi_bits int NOT NULL default 0,
  oi_description nvarchar(255) NOT NULL CONSTRAINT DF_oi_description DEFAULT '',
  oi_description_id bigint unsigned NOT NULL CONSTRAINT DF_oi_description_id DEFAULT 0 CONSTRAINT FK_oi_description_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),
  oi_user int REFERENCES /*_*/mwuser(user_id),
  oi_user_text nvarchar(255) NOT NULL CONSTRAINT DF_oi_user_text DEFAULT '',
  oi_actor bigint unsigned NOT NULL CONSTRAINT DF_oi_actor DEFAULT 0,
  oi_timestamp varchar(14) NOT NULL default '',

  oi_metadata varbinary(max) NOT NULL,
  oi_media_type varchar(16) default null,
  oi_major_mime varchar(16) not null default 'unknown',
  oi_minor_mime nvarchar(100) NOT NULL default 'unknown',
  oi_deleted tinyint NOT NULL default 0,
  oi_sha1 nvarchar(32) NOT NULL default '',

  CONSTRAINT oi_major_mime_ckc check (oi_major_mime IN('unknown', 'application', 'audio', 'image', 'text', 'video', 'message', 'model', 'multipart', 'chemical')),
  CONSTRAINT oi_media_type_ckc check (oi_media_type IN('UNKNOWN', 'BITMAP', 'DRAWING', 'AUDIO', 'VIDEO', 'MULTIMEDIA', 'OFFICE', 'TEXT', 'EXECUTABLE', 'ARCHIVE','3D'))
);

CREATE INDEX /*i*/oi_usertext_timestamp ON /*_*/oldimage (oi_user_text,oi_timestamp);
CREATE INDEX /*i*/oi_actor_timestamp ON /*_*/oldimage (oi_actor,oi_timestamp);
CREATE INDEX /*i*/oi_name_timestamp ON /*_*/oldimage (oi_name,oi_timestamp);
CREATE INDEX /*i*/oi_sha1 ON /*_*/oldimage (oi_sha1);


--
-- Record of deleted file data
--
CREATE TABLE /*_*/filearchive (
  -- Unique row id
  fa_id int NOT NULL PRIMARY KEY IDENTITY,

  -- Original base filename; key to image.img_name, page.page_title, etc
  fa_name nvarchar(255) NOT NULL default '',

  -- Filename of archived file, if an old revision
  fa_archive_name nvarchar(255) default '',

  -- Which storage bin (directory tree or object store) the file data
  -- is stored in. Should be 'deleted' for files that have been deleted;
  -- any other bin is not yet in use.
  fa_storage_group nvarchar(16),

  -- SHA-1 of the file contents plus extension, used as a key for storage.
  -- eg 8f8a562add37052a1848ff7771a2c515db94baa9.jpg
  --
  -- If NULL, the file was missing at deletion time or has been purged
  -- from the archival storage.
  fa_storage_key nvarchar(64) default '',

  -- Deletion information, if this file is deleted.
  fa_deleted_user int,
  fa_deleted_timestamp varchar(14) default '',
  fa_deleted_reason nvarchar(max) CONSTRAINT DF_fa_deleted_reason DEFAULT '',
  fa_deleted_reason_id bigint unsigned NOT NULL CONSTRAINT DF_fa_deleted_reason_id DEFAULT 0 CONSTRAINT FK_fa_deleted_reason_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),

  -- Duped fields from image
  fa_size int default 0,
  fa_width int default 0,
  fa_height int default 0,
  fa_metadata varbinary(max),
  fa_bits int default 0,
  fa_media_type varchar(16) default null,
  fa_major_mime varchar(16) not null default 'unknown',
  fa_minor_mime nvarchar(100) default 'unknown',
  fa_description nvarchar(255) CONSTRAINT DF_fa_description DEFAULT '',
  fa_description_id bigint unsigned NOT NULL CONSTRAINT DF_fa_description DEFAULT 0 CONSTRAINT FK_fa_description FOREIGN KEY REFERENCES /*_*/comment(comment_id),
  fa_user int default 0 REFERENCES /*_*/mwuser(user_id) ON DELETE SET NULL,
  fa_user_text nvarchar(255) CONSTRAINT DF_fa_user_text DEFAULT '',
  fa_actor bigint unsigned NOT NULL CONSTRAINT DF_fa_actor DEFAULT 0,
  fa_timestamp varchar(14) default '',

  -- Visibility of deleted revisions, bitfield
  fa_deleted tinyint NOT NULL default 0,

  -- sha1 hash of file content
  fa_sha1 nvarchar(32) NOT NULL default '',

  CONSTRAINT fa_major_mime_ckc check (fa_major_mime in('unknown', 'application', 'audio', 'image', 'text', 'video', 'message', 'model', 'multipart', 'chemical')),
  CONSTRAINT fa_media_type_ckc check (fa_media_type in('UNKNOWN', 'BITMAP', 'DRAWING', 'AUDIO', 'VIDEO', 'MULTIMEDIA', 'OFFICE', 'TEXT', 'EXECUTABLE', 'ARCHIVE','3D'))
);

-- pick out by image name
CREATE INDEX /*i*/fa_name ON /*_*/filearchive (fa_name, fa_timestamp);
-- pick out dupe files
CREATE INDEX /*i*/fa_storage_group ON /*_*/filearchive (fa_storage_group, fa_storage_key);
-- sort by deletion time
CREATE INDEX /*i*/fa_deleted_timestamp ON /*_*/filearchive (fa_deleted_timestamp);
-- sort by uploader
CREATE INDEX /*i*/fa_user_timestamp ON /*_*/filearchive (fa_user_text,fa_timestamp);
CREATE INDEX /*i*/fa_actor_timestamp ON /*_*/filearchive (fa_actor,fa_timestamp);
-- find file by sha1, 10 bytes will be enough for hashes to be indexed
CREATE INDEX /*i*/fa_sha1 ON /*_*/filearchive (fa_sha1);


--
-- Store information about newly uploaded files before they're
-- moved into the actual filestore
--
CREATE TABLE /*_*/uploadstash (
  us_id int NOT NULL PRIMARY KEY IDENTITY,

  -- the user who uploaded the file.
  us_user int REFERENCES /*_*/mwuser(user_id) ON DELETE SET NULL,

  -- file key. this is how applications actually search for the file.
  -- this might go away, or become the primary key.
  us_key nvarchar(255) NOT NULL,

  -- the original path
  us_orig_path nvarchar(255) NOT NULL,

  -- the temporary path at which the file is actually stored
  us_path nvarchar(255) NOT NULL,

  -- which type of upload the file came from (sometimes)
  us_source_type nvarchar(50),

  -- the date/time on which the file was added
  us_timestamp varchar(14) NOT NULL,

  us_status nvarchar(50) NOT NULL,

  -- chunk counter starts at 0, current offset is stored in us_size
  us_chunk_inx int NULL,

  -- Serialized file properties from FSFile::getProps()
  us_props nvarchar(max),

  -- file size in bytes
  us_size int NOT NULL,
  -- this hash comes from FSFile::getSha1Base36(), and is 31 characters
  us_sha1 nvarchar(31) NOT NULL,
  us_mime nvarchar(255),
  -- Media type as defined by the MEDIATYPE_xxx constants, should duplicate definition in the image table
  us_media_type varchar(16) default null,
  -- image-specific properties
  us_image_width int,
  us_image_height int,
  us_image_bits smallint,

  CONSTRAINT us_media_type_ckc check (us_media_type in('UNKNOWN', 'BITMAP', 'DRAWING', 'AUDIO', 'VIDEO', 'MULTIMEDIA', 'OFFICE', 'TEXT', 'EXECUTABLE', 'ARCHIVE', '3D'))
);

-- sometimes there's a delete for all of a user's stuff.
CREATE INDEX /*i*/us_user ON /*_*/uploadstash (us_user);
-- pick out files by key, enforce key uniqueness
CREATE UNIQUE INDEX /*i*/us_key ON /*_*/uploadstash (us_key);
-- the abandoned upload cleanup script needs this
CREATE INDEX /*i*/us_timestamp ON /*_*/uploadstash (us_timestamp);


--
-- Primarily a summary table for Special:Recentchanges,
-- this table contains some additional info on edits from
-- the last few days, see Article::editUpdates()
--
CREATE TABLE /*_*/recentchanges (
  rc_id int NOT NULL CONSTRAINT recentchanges__pk PRIMARY KEY IDENTITY,
  rc_timestamp varchar(14) not null default '',

  -- As in revision
  rc_user int NOT NULL default 0 CONSTRAINT rc_user__user_id__fk FOREIGN KEY REFERENCES /*_*/mwuser(user_id),
  rc_user_text nvarchar(255) NOT NULL CONSTRAINT DF_rc_user_text DEFAULT '',
  rc_actor bigint unsigned NOT NULL CONSTRAINT DF_rc_actor DEFAULT 0,

  -- When pages are renamed, their RC entries do _not_ change.
  rc_namespace int NOT NULL default 0,
  rc_title nvarchar(255) NOT NULL default '',

  -- as in revision...
  rc_comment nvarchar(255) NOT NULL default '',
  rc_comment_id bigint unsigned NOT NULL CONSTRAINT DF_rc_comment_id DEFAULT 0 CONSTRAINT FK_rc_comment_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),
  rc_minor bit NOT NULL default 0,

  -- Edits by user accounts with the 'bot' rights key are
  -- marked with a 1 here, and will be hidden from the
  -- default view.
  rc_bot bit NOT NULL default 0,

  -- Set if this change corresponds to a page creation
  rc_new bit NOT NULL default 0,

  -- Key to page_id (was cur_id prior to 1.5).
  -- This will keep links working after moves while
  -- retaining the at-the-time name in the changes list.
  rc_cur_id int, -- NOT FK

  -- rev_id of the given revision
  rc_this_oldid int, -- NOT FK

  -- rev_id of the prior revision, for generating diff links.
  rc_last_oldid int, -- NOT FK

  -- The type of change entry (RC_EDIT,RC_NEW,RC_LOG,RC_EXTERNAL)
  rc_type tinyint NOT NULL default 0,

  -- The source of the change entry (replaces rc_type)
  -- default of '' is temporary, needed for initial migration
  rc_source nvarchar(16) not null default '',

  -- If the Recent Changes Patrol option is enabled,
  -- users may mark edits as having been reviewed to
  -- remove a warning flag on the RC list.
  -- A value of 1 indicates the page has been reviewed manually.
  -- A value of 2 indicates the page has been automatically reviewed.
  rc_patrolled tinyint NOT NULL CONSTRAINT DF_rc_patrolled DEFAULT 0

  -- Recorded IP address the edit was made from, if the
  -- $wgPutIPinRC option is enabled.
  rc_ip nvarchar(40) NOT NULL default '',

  -- Text length in characters before
  -- and after the edit
  rc_old_len int,
  rc_new_len int,

  -- Visibility of recent changes items, bitfield
  rc_deleted tinyint NOT NULL default 0,

  -- Value corresponding to log_id, specific log entries
  rc_logid int, -- FK added later
  -- Store log type info here, or null
  rc_log_type nvarchar(255) NULL default NULL,
  -- Store log action or null
  rc_log_action nvarchar(255) NULL default NULL,
  -- Log params
  rc_params nvarchar(max) NULL
);

CREATE INDEX /*i*/rc_timestamp ON /*_*/recentchanges (rc_timestamp);
CREATE INDEX /*i*/rc_namespace_title_timestamp ON /*_*/recentchanges (rc_namespace, rc_title, rc_timestamp);
CREATE INDEX /*i*/rc_cur_id ON /*_*/recentchanges (rc_cur_id);
CREATE INDEX /*i*/new_name_timestamp ON /*_*/recentchanges (rc_new,rc_namespace,rc_timestamp);
CREATE INDEX /*i*/rc_ip ON /*_*/recentchanges (rc_ip);
CREATE INDEX /*i*/rc_ns_usertext ON /*_*/recentchanges (rc_namespace, rc_user_text);
CREATE INDEX /*i*/rc_user_text ON /*_*/recentchanges (rc_user_text, rc_timestamp);
CREATE INDEX /*i*/rc_ns_actor ON /*_*/recentchanges (rc_namespace, rc_actor);
CREATE INDEX /*i*/rc_actor ON /*_*/recentchanges (rc_actor, rc_timestamp);
CREATE INDEX /*i*/rc_name_type_patrolled_timestamp ON /*_*/recentchanges (rc_namespace, rc_type, rc_patrolled, rc_timestamp);


CREATE TABLE /*_*/watchlist (
  wl_id int NOT NULL PRIMARY KEY IDENTITY,
  -- Key to user.user_id
  wl_user int NOT NULL REFERENCES /*_*/mwuser(user_id) ON DELETE CASCADE,

  -- Key to page_namespace/page_title
  -- Note that users may watch pages which do not exist yet,
  -- or existed in the past but have been deleted.
  wl_namespace int NOT NULL default 0,
  wl_title nvarchar(255) NOT NULL default '',

  -- Timestamp used to send notification e-mails and show "updated since last visit" markers on
  -- history and recent changes / watchlist. Set to NULL when the user visits the latest revision
  -- of the page, which means that they should be sent an e-mail on the next change.
  wl_notificationtimestamp varchar(14)

);

CREATE UNIQUE INDEX /*i*/wl_user ON /*_*/watchlist (wl_user, wl_namespace, wl_title);
CREATE INDEX /*i*/namespace_title ON /*_*/watchlist (wl_namespace, wl_title);


--
-- Our search index for the builtin MediaWiki search
--
CREATE TABLE /*_*/searchindex (
  -- Key to page_id
  si_page int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,

  -- Munged version of title
  si_title nvarchar(255) NOT NULL default '',

  -- Munged version of body text
  si_text nvarchar(max) NOT NULL
);

CREATE UNIQUE INDEX /*i*/si_page ON /*_*/searchindex (si_page);
-- Fulltext index is defined in MssqlInstaller.php

--
-- Recognized interwiki link prefixes
--
CREATE TABLE /*_*/interwiki (
  -- The interwiki prefix, (e.g. "Meatball", or the language prefix "de")
  iw_prefix nvarchar(32) NOT NULL CONSTRAINT PK_interwiki PRIMARY KEY,

  -- The URL of the wiki, with "$1" as a placeholder for an article name.
  -- Any spaces in the name will be transformed to underscores before
  -- insertion.
  iw_url nvarchar(max) NOT NULL,

  -- The URL of the file api.php
  iw_api nvarchar(max) NOT NULL,

  -- The name of the database (for a connection to be established with LBFactory::getMainLB( 'wikiid' ))
  iw_wikiid nvarchar(64) NOT NULL,

  -- A boolean value indicating whether the wiki is in this project
  -- (used, for example, to detect redirect loops)
  iw_local bit NOT NULL,

  -- Boolean value indicating whether interwiki transclusions are allowed.
  iw_trans bit NOT NULL default 0
);

--
-- Used for caching expensive grouped queries
--
CREATE TABLE /*_*/querycache (
  -- A key name, generally the base name of of the special page.
  qc_type nvarchar(32) NOT NULL,

  -- Some sort of stored value. Sizes, counts...
  qc_value int NOT NULL default 0,

  -- Target namespace+title
  qc_namespace int NOT NULL default 0,
  qc_title nvarchar(255) NOT NULL default ''
);

CREATE INDEX /*i*/qc_type ON /*_*/querycache (qc_type,qc_value);


--
-- For a few generic cache operations if not using Memcached
--
CREATE TABLE /*_*/objectcache (
  keyname nvarchar(255) NOT NULL default '' PRIMARY KEY,
  value varbinary(max),
  exptime varchar(14)
);
CREATE INDEX /*i*/exptime ON /*_*/objectcache (exptime);


--
-- Cache of interwiki transclusion
--
CREATE TABLE /*_*/transcache (
  tc_url nvarchar(255) NOT NULL,
  tc_contents nvarchar(max),
  tc_time varchar(14) NOT NULL
);

CREATE UNIQUE INDEX /*i*/tc_url_idx ON /*_*/transcache (tc_url);


CREATE TABLE /*_*/logging (
  -- Log ID, for referring to this specific log entry, probably for deletion and such.
  log_id int NOT NULL PRIMARY KEY IDENTITY(0,1),

  -- Symbolic keys for the general log type and the action type
  -- within the log. The output format will be controlled by the
  -- action field, but only the type controls categorization.
  log_type nvarchar(32) NOT NULL default '',
  log_action nvarchar(32) NOT NULL default '',

  -- Timestamp. Duh.
  log_timestamp varchar(14) NOT NULL default '',

  -- The user who performed this action; key to user_id
  log_user int, -- NOT an FK, if a user is deleted we still want to maintain a record of who did a thing

  -- Name of the user who performed this action
  log_user_text nvarchar(255) NOT NULL default '',

  -- The actor who performed this action
  log_actor bigint unsigned NOT NULL CONSTRAINT DF_log_actor DEFAULT 0,

  -- Key to the page affected. Where a user is the target,
  -- this will point to the user page.
  log_namespace int NOT NULL default 0,
  log_title nvarchar(255) NOT NULL default '',
  log_page int NULL, -- NOT an FK, logging entries are inserted for deleted pages which still reference the deleted page ids

  -- Freeform text. Interpreted as edit history comments.
  log_comment nvarchar(255) NOT NULL default '',

  -- Key to comment_id. Comment summarizing the change.
  -- ("DEFAULT 0" is temporary, signaling that log_comment should be used)
  log_comment_id bigint unsigned NOT NULL CONSTRAINT DF_log_comment_id DEFAULT 0 CONSTRAINT FK_log_comment_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),

  -- miscellaneous parameters:
  -- LF separated list (old system) or serialized PHP array (new system)
  log_params nvarchar(max) NOT NULL,

  -- rev_deleted for logs
  log_deleted tinyint NOT NULL default 0
);

CREATE INDEX /*i*/type_time ON /*_*/logging (log_type, log_timestamp);
CREATE INDEX /*i*/user_time ON /*_*/logging (log_user, log_timestamp);
CREATE INDEX /*i*/page_time ON /*_*/logging (log_namespace, log_title, log_timestamp);
CREATE INDEX /*i*/times ON /*_*/logging (log_timestamp);
CREATE INDEX /*i*/log_user_type_time ON /*_*/logging (log_user, log_type, log_timestamp);
CREATE INDEX /*i*/log_page_id_time ON /*_*/logging (log_page,log_timestamp);
CREATE INDEX /*i*/log_type_action ON /*_*/logging (log_type, log_action, log_timestamp);
CREATE INDEX /*i*/log_user_text_type_time ON /*_*/logging (log_user_text, log_type, log_timestamp);
CREATE INDEX /*i*/log_user_text_time ON /*_*/logging (log_user_text, log_timestamp);
CREATE INDEX /*i*/actor_time ON /*_*/logging (log_actor, log_timestamp);
CREATE INDEX /*i*/log_actor_type_time ON /*_*/logging (log_actor, log_type, log_timestamp);

INSERT INTO /*_*/logging (log_user,log_page,log_params) VALUES(0,0,'');

ALTER TABLE /*_*/recentchanges ADD CONSTRAINT rc_logid__log_id__fk FOREIGN KEY (rc_logid) REFERENCES /*_*/logging(log_id) ON DELETE CASCADE;

CREATE TABLE /*_*/log_search (
  -- The type of ID (rev ID, log ID, rev timestamp, username)
  ls_field nvarchar(32) NOT NULL,
  -- The value of the ID
  ls_value nvarchar(255) NOT NULL,
  -- Key to log_id
  ls_log_id int REFERENCES /*_*/logging(log_id) ON DELETE CASCADE
);
CREATE UNIQUE INDEX /*i*/ls_field_val ON /*_*/log_search (ls_field,ls_value,ls_log_id);
CREATE INDEX /*i*/ls_log_id ON /*_*/log_search (ls_log_id);


-- Jobs performed by parallel apache threads or a command-line daemon
CREATE TABLE /*_*/job (
  job_id int NOT NULL PRIMARY KEY IDENTITY,

  -- Command name
  -- Limited to 60 to prevent key length overflow
  job_cmd nvarchar(60) NOT NULL default '',

  -- Namespace and title to act on
  -- Should be 0 and '' if the command does not operate on a title
  job_namespace int NOT NULL,
  job_title nvarchar(255) NOT NULL,

  -- Timestamp of when the job was inserted
  -- NULL for jobs added before addition of the timestamp
  job_timestamp nvarchar(14) NULL default NULL,

  -- Any other parameters to the command
  -- Stored as a PHP serialized array, or an empty string if there are no parameters
  job_params nvarchar(max) NOT NULL,

  -- Random, non-unique, number used for job acquisition (for lock concurrency)
  job_random int NOT NULL default 0,

  -- The number of times this job has been locked
  job_attempts int NOT NULL default 0,

  -- Field that conveys process locks on rows via process UUIDs
  job_token nvarchar(32) NOT NULL default '',

  -- Timestamp when the job was locked
  job_token_timestamp varchar(14) NULL default NULL,

  -- Base 36 SHA1 of the job parameters relevant to detecting duplicates
  job_sha1 nvarchar(32) NOT NULL default ''
);

CREATE INDEX /*i*/job_sha1 ON /*_*/job (job_sha1);
CREATE INDEX /*i*/job_cmd_token ON /*_*/job (job_cmd,job_token,job_random);
CREATE INDEX /*i*/job_cmd_token_id ON /*_*/job (job_cmd,job_token,job_id);
CREATE INDEX /*i*/job_cmd ON /*_*/job (job_cmd, job_namespace, job_title);
CREATE INDEX /*i*/job_timestamp ON /*_*/job (job_timestamp);


-- Details of updates to cached special pages
CREATE TABLE /*_*/querycache_info (
  -- Special page name
  -- Corresponds to a qc_type value
  qci_type nvarchar(32) NOT NULL default '',

  -- Timestamp of last update
  qci_timestamp varchar(14) NOT NULL default ''
);

CREATE UNIQUE INDEX /*i*/qci_type ON /*_*/querycache_info (qci_type);


-- For each redirect, this table contains exactly one row defining its target
CREATE TABLE /*_*/redirect (
  -- Key to the page_id of the redirect page
  rd_from int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,

  -- Key to page_namespace/page_title of the target page.
  -- The target page may or may not exist, and due to renames
  -- and deletions may refer to different page records as time
  -- goes by.
  rd_namespace int NOT NULL default 0,
  rd_title nvarchar(255) NOT NULL default '',
  rd_interwiki nvarchar(32) default NULL,
  rd_fragment nvarchar(255) default NULL
);

CREATE INDEX /*i*/rd_ns_title ON /*_*/redirect (rd_namespace,rd_title,rd_from);


-- Used for caching expensive grouped queries that need two links (for example double-redirects)
CREATE TABLE /*_*/querycachetwo (
  -- A key name, generally the base name of of the special page.
  qcc_type nvarchar(32) NOT NULL,

  -- Some sort of stored value. Sizes, counts...
  qcc_value int NOT NULL default 0,

  -- Target namespace+title
  qcc_namespace int NOT NULL default 0,
  qcc_title nvarchar(255) NOT NULL default '',

  -- Target namespace+title2
  qcc_namespacetwo int NOT NULL default 0,
  qcc_titletwo nvarchar(255) NOT NULL default ''
);

CREATE INDEX /*i*/qcc_type ON /*_*/querycachetwo (qcc_type,qcc_value);
CREATE INDEX /*i*/qcc_title ON /*_*/querycachetwo (qcc_type,qcc_namespace,qcc_title);
CREATE INDEX /*i*/qcc_titletwo ON /*_*/querycachetwo (qcc_type,qcc_namespacetwo,qcc_titletwo);


-- Used for storing page restrictions (i.e. protection levels)
CREATE TABLE /*_*/page_restrictions (
  -- Field for an ID for this restrictions row (sort-key for Special:ProtectedPages)
  pr_id int NOT NULL PRIMARY KEY IDENTITY,
  -- Page to apply restrictions to (Foreign Key to page).
  pr_page int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,
  -- The protection type (edit, move, etc)
  pr_type nvarchar(60) NOT NULL,
  -- The protection level (Sysop, autoconfirmed, etc)
  pr_level nvarchar(60) NOT NULL,
  -- Whether or not to cascade the protection down to pages transcluded.
  pr_cascade bit NOT NULL,
  -- Field for future support of per-user restriction.
  pr_user int NULL,
  -- Field for time-limited protection.
  pr_expiry varchar(14) NULL
);

CREATE UNIQUE INDEX /*i*/pr_pagetype ON /*_*/page_restrictions (pr_page,pr_type);
CREATE INDEX /*i*/pr_typelevel ON /*_*/page_restrictions (pr_type,pr_level);
CREATE INDEX /*i*/pr_level ON /*_*/page_restrictions (pr_level);
CREATE INDEX /*i*/pr_cascade ON /*_*/page_restrictions (pr_cascade);


-- Protected titles - nonexistent pages that have been protected
CREATE TABLE /*_*/protected_titles (
  pt_namespace int NOT NULL,
  pt_title nvarchar(255) NOT NULL,
  pt_user int REFERENCES /*_*/mwuser(user_id) ON DELETE SET NULL,
  pt_reason nvarchar(255) CONSTRAINT DF_pt_reason DEFAULT '',
  pt_reason_id bigint unsigned NOT NULL CONSTRAINT DF_pt_reason_id DEFAULT 0 CONSTRAINT FK_pt_reason_id FOREIGN KEY REFERENCES /*_*/comment(comment_id),
  pt_timestamp varchar(14) NOT NULL,
  pt_expiry varchar(14) NOT NULL,
  pt_create_perm nvarchar(60) NOT NULL,
  CONSTRAINT PK_protected_titles PRIMARY KEY(pt_namespace,pt_title)
);

CREATE INDEX /*i*/pt_timestamp ON /*_*/protected_titles (pt_timestamp);


-- Name/value pairs indexed by page_id
CREATE TABLE /*_*/page_props (
  pp_page int NOT NULL REFERENCES /*_*/page(page_id) ON DELETE CASCADE,
  pp_propname nvarchar(60) NOT NULL,
  pp_value nvarchar(max) NOT NULL,
  pp_sortkey float DEFAULT NULL,
  CONSTRAINT PK_page_props PRIMARY KEY(pp_page,pp_propname)
);

CREATE UNIQUE INDEX /*i*/pp_propname_page ON /*_*/page_props (pp_propname,pp_page);
CREATE UNIQUE INDEX /*i*/pp_propname_sortkey_page ON /*_*/page_props (pp_propname,pp_sortkey,pp_page);


-- A table to log updates, one text key row per update.
CREATE TABLE /*_*/updatelog (
  ul_key nvarchar(255) NOT NULL PRIMARY KEY,
  ul_value nvarchar(max)
);


-- A table to track tags for revisions, logs and recent changes.
CREATE TABLE /*_*/change_tag (
  ct_id int NOT NULL PRIMARY KEY IDENTITY,
  -- RCID for the change
  ct_rc_id int NULL REFERENCES /*_*/recentchanges(rc_id),
  -- LOGID for the change
  ct_log_id int NULL REFERENCES /*_*/logging(log_id),
  -- REVID for the change
  ct_rev_id int NULL REFERENCES /*_*/revision(rev_id),
  -- Tag applied
  ct_tag nvarchar(255) NOT NULL,
  -- Parameters for the tag, presently unused
  ct_params nvarchar(max) NULL,
  -- Foreign key to change_tag_def row
  ct_tag_id int NULL CONSTRAINT ctd_tag_id__fk FOREIGN KEY REFERENCES /*_*/change_tag_def(ctd_id)
);

CREATE UNIQUE INDEX /*i*/change_tag_rc_tag ON /*_*/change_tag (ct_rc_id,ct_tag);
CREATE UNIQUE INDEX /*i*/change_tag_log_tag ON /*_*/change_tag (ct_log_id,ct_tag);
CREATE UNIQUE INDEX /*i*/change_tag_rev_tag ON /*_*/change_tag (ct_rev_id,ct_tag);
-- Covering index, so we can pull all the info only out of the index.
CREATE INDEX /*i*/change_tag_tag_id ON /*_*/change_tag (ct_tag,ct_rc_id,ct_rev_id,ct_log_id);
CREATE INDEX /*i*/change_tag_tag_id_id ON /*_*/change_tag (ct_tag_id,ct_rc_id,ct_rev_id,ct_log_id);

-- Rollup table to pull a LIST of tags simply without ugly GROUP_CONCAT
-- that only works on MySQL 4.1+
CREATE TABLE /*_*/tag_summary (
  ts_id int NOT NULL PRIMARY KEY IDENTITY,
  -- RCID for the change
  ts_rc_id int NULL REFERENCES /*_*/recentchanges(rc_id),
  -- LOGID for the change
  ts_log_id int NULL REFERENCES /*_*/logging(log_id),
  -- REVID for the change
  ts_rev_id int NULL REFERENCES /*_*/revision(rev_id),
  -- Comma-separated list of tags
  ts_tags nvarchar(max) NOT NULL
);

CREATE UNIQUE INDEX /*i*/tag_summary_rc_id ON /*_*/tag_summary (ts_rc_id);
CREATE UNIQUE INDEX /*i*/tag_summary_log_id ON /*_*/tag_summary (ts_log_id);
CREATE UNIQUE INDEX /*i*/tag_summary_rev_id ON /*_*/tag_summary (ts_rev_id);


CREATE TABLE /*_*/valid_tag (
  vt_tag nvarchar(255) NOT NULL PRIMARY KEY
);

-- Table for storing localisation data
CREATE TABLE /*_*/l10n_cache (
  -- Language code
  lc_lang nvarchar(32) NOT NULL,
  -- Cache key
  lc_key nvarchar(255) NOT NULL,
  -- Value
  lc_value varbinary(max) NOT NULL
);
CREATE INDEX /*i*/lc_lang_key ON /*_*/l10n_cache (lc_lang, lc_key);

-- Table caching which local files a module depends on that aren't
-- registered directly, used for fast retrieval of file dependency.
-- Currently only used for tracking images that CSS depends on
CREATE TABLE /*_*/module_deps (
  -- Module name
  md_module nvarchar(255) NOT NULL,
  -- Skin name
  md_skin nvarchar(32) NOT NULL,
  -- JSON nvarchar(max) with file dependencies
  md_deps nvarchar(max) NOT NULL
);
CREATE UNIQUE INDEX /*i*/md_module_skin ON /*_*/module_deps (md_module, md_skin);

-- Holds all the sites known to the wiki.
CREATE TABLE /*_*/sites (
  -- Numeric id of the site
  site_id                    int        NOT NULL PRIMARY KEY IDENTITY,

  -- Global identifier for the site, ie 'enwiktionary'
  site_global_key            nvarchar(32)       NOT NULL,

  -- Type of the site, ie 'mediawiki'
  site_type                  nvarchar(32)       NOT NULL,

  -- Group of the site, ie 'wikipedia'
  site_group                 nvarchar(32)       NOT NULL,

  -- Source of the site data, ie 'local', 'wikidata', 'my-magical-repo'
  site_source                nvarchar(32)       NOT NULL,

  -- Language code of the sites primary language.
  site_language              nvarchar(32)       NOT NULL,

  -- Protocol of the site, ie 'http://', 'irc://', '//'
  -- This field is an index for lookups and is build from type specific data in site_data.
  site_protocol              nvarchar(32)       NOT NULL,

  -- Domain of the site in reverse order, ie 'org.mediawiki.www.'
  -- This field is an index for lookups and is build from type specific data in site_data.
  site_domain                NVARCHAR(255)        NOT NULL,

  -- Type dependent site data.
  site_data                  nvarchar(max)                NOT NULL,

  -- If site.tld/path/key:pageTitle should forward users to  the page on
  -- the actual site, where "key" is the local identifier.
  site_forward              bit                NOT NULL,

  -- Type dependent site config.
  -- For instance if template transclusion should be allowed if it's a MediaWiki.
  site_config               nvarchar(max)                NOT NULL
);

CREATE UNIQUE INDEX /*i*/sites_global_key ON /*_*/sites (site_global_key);
CREATE INDEX /*i*/sites_type ON /*_*/sites (site_type);
CREATE INDEX /*i*/sites_group ON /*_*/sites (site_group);
CREATE INDEX /*i*/sites_source ON /*_*/sites (site_source);
CREATE INDEX /*i*/sites_language ON /*_*/sites (site_language);
CREATE INDEX /*i*/sites_protocol ON /*_*/sites (site_protocol);
CREATE INDEX /*i*/sites_domain ON /*_*/sites (site_domain);
CREATE INDEX /*i*/sites_forward ON /*_*/sites (site_forward);

-- Links local site identifiers to their corresponding site.
CREATE TABLE /*_*/site_identifiers (
  -- Key on site.site_id
  si_site                    int        NOT NULL REFERENCES /*_*/sites(site_id) ON DELETE CASCADE,

  -- local key type, ie 'interwiki' or 'langlink'
  si_type                    nvarchar(32)       NOT NULL,

  -- local key value, ie 'en' or 'wiktionary'
  si_key                     nvarchar(32)       NOT NULL,

  CONSTRAINT PK_site_identifiers PRIMARY KEY(si_type, si_key)
);

CREATE INDEX /*i*/site_ids_site ON /*_*/site_identifiers (si_site);
CREATE INDEX /*i*/site_ids_key ON /*_*/site_identifiers (si_key);