maintenance/archives/patch-restructure.sql

   1 -- The Great Restructuring of October 2004
   2 -- Creates 'page', 'revision' tables and transforms the classic
   3 -- cur+old into a separate page+revision+text structure.
   4 --
   5 -- The pre-conversion 'old' table is renamed to 'text' and used
   6 -- without internal restructuring to avoid rebuilding the entire
   7 -- table. (This can be done separately if desired.)
   8 --
   9 -- The pre-conversion 'cur' table is now redundant and can be
  10 -- discarded when done.
  11
  12 CREATE TABLE /*$wgDBprefix*/page (
  13   page_id int unsigned NOT NULL auto_increment,
  14   page_namespace tinyint NOT NULL,
  15   page_title varchar(255) binary NOT NULL,
  16   page_restrictions tinyblob NOT NULL,
  17   page_counter bigint unsigned NOT NULL default '0',
  18   page_is_redirect tinyint unsigned NOT NULL default '0',
  19   page_is_new tinyint unsigned NOT NULL default '0',
  20   page_random real unsigned NOT NULL,
  21   page_touched binary(14) NOT NULL default '',
  22   page_latest int unsigned NOT NULL,
  23   page_len int unsigned NOT NULL,
  24
  25   PRIMARY KEY page_id (page_id),
  26   UNIQUE INDEX name_title (page_namespace,page_title),
  27   INDEX (page_random),
  28   INDEX (page_len)
  29 );
  30
  31 CREATE TABLE /*$wgDBprefix*/revision (
  32   rev_id int unsigned NOT NULL auto_increment,
  33   rev_page int unsigned NOT NULL,
  34   rev_comment tinyblob NOT NULL,
  35   rev_user int unsigned NOT NULL default '0',
  36   rev_user_text varchar(255) binary NOT NULL default '',
  37   rev_timestamp binary(14) NOT NULL default '',
  38   rev_minor_edit tinyint unsigned NOT NULL default '0',
  39   rev_deleted tinyint unsigned NOT NULL default '0',
  40
  41   PRIMARY KEY rev_page_id (rev_page, rev_id),
  42   UNIQUE INDEX rev_id (rev_id),
  43   INDEX rev_timestamp (rev_timestamp),
  44   INDEX page_timestamp (rev_page,rev_timestamp),
  45   INDEX user_timestamp (rev_user,rev_timestamp),
  46   INDEX usertext_timestamp (rev_user_text,rev_timestamp)
  47 );
  48
  49 -- If creating new 'text' table it would look like this:
  50 --
  51 -- CREATE TABLE /*$wgDBprefix*/text (
  52 --   old_id int(8) unsigned NOT NULL auto_increment,
  53 --   old_text mediumtext NOT NULL,
  54 --   old_flags tinyblob NOT NULL,
  55 --
  56 --   PRIMARY KEY old_id (old_id)
  57 -- );
  58
  59
  60 -- Lock!
  61 LOCK TABLES /*$wgDBprefix*/page WRITE, /*$wgDBprefix*/revision WRITE, /*$wgDBprefix*/old WRITE, /*$wgDBprefix*/cur WRITE;
  62
  63 -- Save the last old_id value for later
  64 SELECT (@maxold:=MAX(old_id)) FROM /*$wgDBprefix*/old;
  65
  66 -- First, copy all current entries into the old table.
  67 INSERT
  68   INTO /*$wgDBprefix*/old
  69     (old_namespace,
  70     old_title,
  71     old_text,
  72     old_comment,
  73     old_user,
  74     old_user_text,
  75     old_timestamp,
  76     old_minor_edit,
  77     old_flags)
  78   SELECT
  79     cur_namespace,
  80     cur_title,
  81     cur_text,
  82     cur_comment,
  83     cur_user,
  84     cur_user_text,
  85     cur_timestamp,
  86     cur_minor_edit,
  87     ''
  88   FROM /*$wgDBprefix*/cur;
  89
  90 -- Now, copy all old data except the text into revisions
  91 INSERT
  92   INTO /*$wgDBprefix*/revision
  93     (rev_id,
  94     rev_page,
  95     rev_comment,
  96     rev_user,
  97     rev_user_text,
  98     rev_timestamp,
  99     rev_minor_edit)
 100   SELECT
 101     old_id,
 102     cur_id,
 103     old_comment,
 104     old_user,
 105     old_user_text,
 106     old_timestamp,
 107     old_minor_edit
 108   FROM /*$wgDBprefix*/old,/*$wgDBprefix*/cur
 109   WHERE old_namespace=cur_namespace
 110     AND old_title=cur_title;
 111
 112 -- And, copy the cur data into page
 113 INSERT
 114   INTO /*$wgDBprefix*/page
 115     (page_id,
 116     page_namespace,
 117     page_title,
 118     page_restrictions,
 119     page_counter,
 120     page_is_redirect,
 121     page_is_new,
 122     page_random,
 123     page_touched,
 124     page_latest)
 125   SELECT
 126     cur_id,
 127     cur_namespace,
 128     cur_title,
 129     cur_restrictions,
 130     cur_counter,
 131     cur_is_redirect,
 132     cur_is_new,
 133     cur_random,
 134     cur_touched,
 135     rev_id
 136   FROM /*$wgDBprefix*/cur,/*$wgDBprefix*/revision
 137   WHERE cur_id=rev_page
 138     AND rev_timestamp=cur_timestamp
 139     AND rev_id > @maxold;
 140
 141 UNLOCK TABLES;
 142
 143 -- Keep the old table around as the text store.
 144 -- Its extra fields will be ignored, but trimming them is slow
 145 -- so we won't bother doing it for now.
 146 ALTER TABLE /*$wgDBprefix*/old RENAME TO /*$wgDBprefix*/text;