maintenance/storage/blob_tracking.sql

   1
   2 -- Table for tracking blobs prior to recompression or similar maintenance operations
   3
   4 CREATE TABLE /*$wgDBprefix*/blob_tracking (
   5         -- page.page_id
   6         -- This may be zero for orphan or deleted text
   7         -- Note that this is for compression grouping only -- it doesn't need to be
   8         -- accurate at the time recompressTracked is run. Operations such as a
   9         -- delete/undelete cycle may make it inaccurate.
  10         bt_page integer not null,
  11
  12         -- revision.rev_id
  13         -- This may be zero for orphan or deleted text
  14         -- Like bt_page, it does not need to be accurate when recompressTracked is run.
  15         bt_rev_id integer not null,
  16
  17         -- text.old_id
  18         bt_text_id integer not null,
  19
  20         -- The ES cluster
  21         bt_cluster varbinary(255),
  22
  23         -- The ES blob ID
  24         bt_blob_id integer not null,
  25
  26         -- The CGZ content hash, or null
  27         bt_cgz_hash varbinary(255),
  28
  29         -- The URL this blob is to be moved to
  30         bt_new_url varbinary(255),
  31
  32         -- True if the text table has been updated to point to bt_new_url
  33         bt_moved bool not null default 0,
  34
  35         -- Primary key
  36         -- Note that text_id is not unique due to null edits (protection, move)
  37         -- moveTextRow(), commit(), trackOrphanText()
  38         PRIMARY KEY (bt_text_id, bt_rev_id),
  39
  40         -- Sort by page for easy CGZ recompression
  41         -- doAllPages(), doAllOrphans(), doPage(), finishIncompleteMoves()
  42         KEY (bt_moved, bt_page, bt_text_id),
  43
  44         -- Key for determining the revisions using a given blob
  45         -- Not used by any scripts yet
  46         KEY (bt_cluster, bt_blob_id, bt_cgz_hash)
  47
  48 ) /*$wgDBTableOptions*/;
  49
  50 -- Tracking table for blob rows that aren't tracked by the text table
  51 CREATE TABLE /*$wgDBprefix*/blob_orphans (
  52         bo_cluster varbinary(255),
  53         bo_blob_id integer not null,
  54
  55         PRIMARY KEY (bo_cluster, bo_blob_id)
  56 ) /*$wgDBTableOptions*/;