maintenance/archives/patch-random-dateindex.sql

   1 -- patch-random-dateindex.sql
   2 -- 2003-02-09
   3 --
   4 -- This patch does two things:
   5 --  * Adds cur_random column to replace random table
   6 --    (Requires change to SpecialRandom.php)
   7 --    random table no longer needs refilling
   8 --    Note: short-term duplicate results *are* possible, but very unlikely on large wiki
   9 --
  10 --  * Adds inverse_timestamp columns to cur and old and indexes
  11 --    to allow descending timestamp sort in history, contribs, etc
  12 --    (Requires changes to Article.php, DatabaseFunctions.php,
  13 --     ... )
  14 --                       cur_timestamp  inverse_timestamp
  15 --     99999999999999 - 20030209222556 = 79969790777443
  16 --     99999999999999 - 20030211083412 = 79969788916587
  17 --
  18 --    We won't need this on MySQL 4; there will be a removal patch later.
  19
  20 -- Indexes:
  21 -- cur needs (cur_random) for random sort
  22 -- cur and old need (namespace,title,timestamp) index for history,watchlist,rclinked
  23 -- cur and old need (user,timestamp) index for contribs
  24 -- cur and old need (user_text,timestamp) index for contribs
  25
  26 ALTER TABLE /*$wgDBprefix*/cur
  27   DROP INDEX cur_user,
  28   DROP INDEX cur_user_text,
  29   ADD COLUMN cur_random real unsigned NOT NULL,
  30   ADD COLUMN inverse_timestamp char(14) binary NOT NULL default '',
  31   ADD INDEX (cur_random),
  32   ADD INDEX name_title_timestamp (cur_namespace,cur_title,inverse_timestamp),
  33   ADD INDEX user_timestamp (cur_user,inverse_timestamp),
  34   ADD INDEX usertext_timestamp (cur_user_text,inverse_timestamp);
  35
  36 UPDATE /*$wgDBprefix*/cur SET
  37   inverse_timestamp=99999999999999-cur_timestamp,
  38   cur_random=RAND();
  39
  40 ALTER TABLE /*$wgDBprefix*/old
  41   DROP INDEX old_user,
  42   DROP INDEX old_user_text,
  43   ADD COLUMN inverse_timestamp char(14) binary NOT NULL default '',
  44   ADD INDEX name_title_timestamp (old_namespace,old_title,inverse_timestamp),
  45   ADD INDEX user_timestamp (old_user,inverse_timestamp),
  46   ADD INDEX usertext_timestamp (old_user_text,inverse_timestamp);
  47
  48 UPDATE /*$wgDBprefix*/old SET
  49   inverse_timestamp=99999999999999-old_timestamp;
  50
  51 -- If leaving wiki publicly accessible in read-only mode during
  52 -- the upgrade, comment out the below line; leave 'random' table
  53 -- in place until the new software is installed.
  54 DROP TABLE /*$wgDBprefix*/random;