User:Topbanana/DBNotes

-- The MySQL table backend for MediaWiki currently uses -- 14-character CHAR or VARCHAR fields to store timestamps. -- The format is YYYYMMDDHHMMSS, which is derived from the -- text format of MySQL's TIMESTAMP fields.

maintenance/tables.sql CREATE TABLE /*$wgDBprefix*/user ( user_id int(5) unsigned NOT NULL auto_increment,  -- Usernames must be unique, must not be in the form of  -- an IP address. _Shouldn't_ allow slashes or case  -- conflicts. Spaces are allowed, and are _not_ converted  -- to underscores like titles. See the User::newFromName for  -- the specific tests that usernames have to pass.  user_name varchar(255) binary NOT NULL default ,  -- Optional 'real name' to be displayed in credit listings  user_real_name varchar(255) binary NOT NULL default ,  -- Password hashes, normally hashed like so:  -- MD5(CONCAT(user_id,'-',MD5(plaintext_password))), see  -- wfEncryptPassword in GlobalFunctions.php  user_password tinyblob NOT NULL default '',  -- When using 'mail me a new password', a random  -- password is generated and the hash stored here.  -- The previous password is left in place until  -- someone actually logs in with the new password, -- at which point the hash is moved to user_password -- and the old password is invalidated. user_newpassword tinyblob NOT NULL default '', -- Note: email should be restricted, not public info. -- Same with passwords. user_email tinytext NOT NULL default '', -- Newline-separated list of name=value defining the user -- preferences user_options blob NOT NULL default '', -- This is a timestamp which is updated when a user -- logs in, logs out, changes preferences, or performs -- some other action requiring HTML cache invalidation -- to ensure that the UI is updated. user_touched char(14) binary NOT NULL default '', -- A pseudorandomly generated value that is stored in -- a cookie when the "remember password" feature is  -- used (previously, a hash of the password was used, but  -- this was vulnerable to cookie-stealing attacks) user_token char(32) binary NOT NULL default '', -- Initially NULL; when a user's e-mail address has been -- validated by returning with a mailed token, this is -- set to the current timestamp. user_email_authenticated CHAR(14) BINARY, -- Randomly generated token created when the e-mail address -- is set and a confirmation test mail sent. user_email_token CHAR(32) BINARY, -- Expiration date for the user_email_token user_email_token_expires CHAR(14) BINARY, -- Timestamp of account registration. -- Accounts predating this schema addition may contain NULL. user_registration CHAR(14) BINARY, PRIMARY KEY user_id (user_id), UNIQUE INDEX user_name (user_name), INDEX (user_email_token) ) TYPE=InnoDB;   --    -- 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 blob.    --    CREATE TABLE /*$wgDBprefix*/user_groups ( -- Key to user_id ug_user int(5) unsigned NOT NULL default '0', -- Group names are short symbolic string keys. -- The set of group names is open-ended, though in practice -- only some predefined ones are likely to be used. --     -- At runtime $wgGroupPermissions will associate group keys -- with particular permissions. A user will have the combined -- permissions of any group they're explicitly in, plus -- the implicit '*' and 'user' groups. ug_group char(16) NOT NULL default '', PRIMARY KEY (ug_user,ug_group), KEY (ug_group) ) TYPE=InnoDB;   -- Stores notifications of user talk page changes, for the display    -- of the "you have new messages" box    CREATE TABLE /*$wgDBprefix*/user_newtalk ( -- Key to user.user_id user_id int(5) NOT NULL default '0', -- If the user is an anonymous user hir IP address is stored here -- since the user_id of 0 is ambiguous user_ip varchar(40) NOT NULL default '', INDEX user_id (user_id), INDEX user_ip (user_ip) );   --    -- Core of the wiki: each page has an entry here which identifies    -- it by title and contains some essential metadata.    --    CREATE TABLE /*$wgDBprefix*/page ( -- Unique identifier number. The page_id will be preserved across -- edits and rename operations, but not deletions and recreations. page_id int(8) unsigned NOT NULL auto_increment, -- A page name is broken into a namespace and a title. -- The namespace keys are UI-language-independent constants, -- defined in includes/Defines.php page_namespace int NOT NULL, -- The rest of the title, as text. -- Spaces are transformed into underscores in title storage. page_title varchar(255) binary NOT NULL, -- Comma-separated set of permission keys indicating who -- can move or edit the page. page_restrictions tinyblob NOT NULL default '', -- Number of times this page has been viewed. page_counter bigint(20) unsigned NOT NULL default '0', -- 1 indicates the article is a redirect. page_is_redirect tinyint(1) unsigned NOT NULL default '0', -- 1 indicates this is a new entry, with only one edit. -- Not all pages with one edit are new pages. page_is_new tinyint(1) unsigned NOT NULL default '0', -- Random value between 0 and 1, used for Special:Randompage page_random real unsigned NOT NULL, -- This timestamp is updated whenever the page changes in     -- a way requiring it to be re-rendered, invalidating caches. -- Aside from editing this includes permission changes, -- creation or deletion of linked pages, and alteration -- of contained templates. page_touched char(14) binary NOT NULL default '', -- Handy key to revision.rev_id of the current revision. -- This may be 0 during page creation, but that shouldn't     -- happen outside of a transaction... hopefully. page_latest int(8) unsigned NOT NULL, -- Uncompressed length in bytes of the page's current source text. page_len int(8) unsigned NOT NULL, PRIMARY KEY page_id (page_id), UNIQUE INDEX name_title (page_namespace,page_title), -- Special-purpose indexes INDEX (page_random), INDEX (page_len) ) TYPE=InnoDB;   --    -- 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 /*$wgDBprefix*/revision ( rev_id int(8) unsigned NOT NULL auto_increment, -- Key to page_id. This should _never_ be invalid. rev_page int(8) unsigned NOT NULL, -- Key to text.old_id, where the actual bulk text is stored. -- It's possible for multiple revisions to use the same text, -- for instance revisions where only metadata is altered -- or a rollback to a previous version. rev_text_id int(8) unsigned NOT NULL, -- Text comment summarizing the change. -- This text is shown in the history and other changes lists, -- rendered in a subset of wiki markup by Linker::formatComment rev_comment tinyblob NOT NULL default '', -- Key to user.user_id of the user who made this edit. -- Stores 0 for anonymous edits and for some mass imports. rev_user int(5) unsigned NOT NULL default '0', -- Text username or IP address of the editor. rev_user_text varchar(255) binary NOT NULL default '', -- Timestamp rev_timestamp char(14) binary NOT NULL default '', -- Records whether the user marked the 'minor edit' checkbox. -- Many automated edits are marked as minor. rev_minor_edit tinyint(1) unsigned NOT NULL default '0', -- Not yet used; reserved for future changes to the deletion system. rev_deleted tinyint(1) unsigned NOT NULL default '0', PRIMARY KEY rev_page_id (rev_page, rev_id), UNIQUE INDEX rev_id (rev_id), INDEX rev_timestamp (rev_timestamp), INDEX page_timestamp (rev_page,rev_timestamp), INDEX user_timestamp (rev_user,rev_timestamp), INDEX usertext_timestamp (rev_user_text,rev_timestamp) ) TYPE=InnoDB;   --    -- 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 /*$wgDBprefix*/text ( -- Unique text storage key number. -- Note that the 'oldid' parameter used in URLs does *not* -- refer to this number anymore, but to rev_id. --     -- revision.rev_text_id is a key to this column old_id int(8) unsigned NOT NULL auto_increment, -- Depending on the contents of the old_flags field, the text -- may be convenient plain text, or it may be funkily encoded. old_text mediumblob NOT NULL default '', -- Comma-separated list of flags: -- gzip: text is compressed with PHP's gzdeflate function. -- utf8: text was stored as UTF-8. --      If $wgLegacyEncoding option is on, rows *without* this flag --      will be converted to UTF-8 transparently at load time. -- object: text field contained a serialized PHP object. --        The object either contains multiple versions compressed --        together to achieve a better compression ratio, or it refers --        to another row where the text can be found. old_flags tinyblob NOT NULL default '', PRIMARY KEY old_id (old_id) ) TYPE=InnoDB;   --    -- Holding area for deleted articles, which may be viewed    -- or restored by admins through the Special:Undelete interface.    -- The fields generally correspond to the page, revision, and text    -- fields, with several caveats.    --    CREATE TABLE /*$wgDBprefix*/archive ( ar_namespace int NOT NULL default '0', ar_title varchar(255) binary NOT NULL default '', -- Newly deleted pages will not store text in this table, -- but will reference the separately existing text rows. -- This field is retained for backwards compatibility, -- so old archived pages will remain accessible after -- upgrading from 1.4 to 1.5. -- Text may be gzipped or otherwise funky. ar_text mediumblob NOT NULL default '', -- Basic revision stuff... ar_comment tinyblob NOT NULL default '', ar_user int(5) unsigned NOT NULL default '0', ar_user_text varchar(255) binary NOT NULL, ar_timestamp char(14) binary NOT NULL default '', ar_minor_edit tinyint(1) NOT NULL default '0', -- See ar_text note. ar_flags tinyblob NOT NULL default '', -- When revisions are deleted, their unique rev_id is stored -- here so it can be retained after undeletion. This is necessary -- to retain permalinks to given revisions after accidental delete -- cycles or messy operations like history merges. --     -- Old entries from 1.4 will be NULL here, and a new rev_id will -- be created on undeletion for those revisions. ar_rev_id int(8) unsigned, -- For newly deleted revisions, this is the text.old_id key to the -- actual stored text. To avoid breaking the block-compression scheme -- and otherwise making storage changes harder, the actual text is     -- *not* deleted from the text table, merely hidden by removal of the -- page and revision entries. --     -- Old entries deleted under 1.2-1.4 will have NULL here, and their -- ar_text and ar_flags fields will be used to create a new text -- row upon undeletion. ar_text_id int(8) unsigned, KEY name_title_timestamp (ar_namespace,ar_title,ar_timestamp) ) TYPE=InnoDB;   --    -- Track page-to-page hyperlinks within the wiki.    --    CREATE TABLE /*$wgDBprefix*/pagelinks ( -- Key to the page_id of the page containing the link. pl_from int(8) unsigned NOT NULL default '0', -- Key to page_namespace/page_title of the target page. -- The target page may or may not exist, and due to renames -- and deletions may refer to different page records as time -- goes by. pl_namespace int NOT NULL default '0', pl_title varchar(255) binary NOT NULL default '', UNIQUE KEY pl_from(pl_from,pl_namespace,pl_title), KEY (pl_namespace,pl_title) ) TYPE=InnoDB;   --    -- Track template inclusions.    --    CREATE TABLE /*$wgDBprefix*/templatelinks ( -- Key to the page_id of the page containing the link. tl_from int(8) unsigned NOT NULL default '0', -- 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. tl_namespace int NOT NULL default '0', tl_title varchar(255) binary NOT NULL default '', UNIQUE KEY tl_from(tl_from,tl_namespace,tl_title), KEY (tl_namespace,tl_title) ) TYPE=InnoDB;   --    -- 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 /*$wgDBprefix*/imagelinks ( -- Key to page_id of the page containing the image / media link. il_from int(8) unsigned NOT NULL default '0', -- Filename of target image. -- This is also the page_title of the file's description page; -- all such pages are in namespace 6 (NS_IMAGE). il_to varchar(255) binary NOT NULL default '', UNIQUE KEY il_from(il_from,il_to), KEY (il_to) ) TYPE=InnoDB;   --    -- Track category inclusions *used inline*    -- This tracks a single level of category membership    -- (folksonomic tagging, really).    --    CREATE TABLE /*$wgDBprefix*/categorylinks ( -- Key to page_id of the page defined as a category member. cl_from int(8) unsigned NOT NULL default '0', -- 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 varchar(255) binary NOT NULL default '', -- The title of the linking page, or an optional override -- to determine sort order. Sorting is by binary order, which -- isn't always ideal, but collations seem to be an exciting -- and dangerous new world in MySQL... The sortkey is updated -- if no override exists and cl_from is renamed. --     -- For MySQL 4.1+ with charset set to utf8, the sort key *index* -- needs cut to be smaller than 1024 bytes (at 3 bytes per char). -- To sort properly on the shorter key, this field needs to be     -- the same shortness. cl_sortkey varchar(86) binary NOT NULL default '', -- This isn't really used at present. Provided for an optional -- sorting method by approximate addition time. cl_timestamp timestamp NOT NULL, UNIQUE KEY cl_from(cl_from,cl_to), -- We always sort within a given category... KEY cl_sortkey(cl_to,cl_sortkey), -- Not really used? KEY cl_timestamp(cl_to,cl_timestamp) ) TYPE=InnoDB;   --    -- Track links to external URLs    --    CREATE TABLE /*$wgDBprefix*/externallinks ( -- page_id of the referring page el_from int(8) unsigned NOT NULL default '0', -- The URL el_to blob NOT NULL default '', -- In the case of HTTP URLs, this is the URL with any username or password -- removed, and with the labels in the hostname reversed and converted to     -- lower case. An extra dot is added to allow for matching of either -- example.com or *.example.com in a single scan. -- Example: --     http://user:password@sub.example.com/page.html --  becomes --     http://com.example.sub./page.html -- which allows for fast searching for all pages under example.com with the -- clause: --     WHERE el_index LIKE 'http://com.example.%' el_index blob NOT NULL default '', KEY (el_from, el_to(40)), KEY (el_to(60), el_from), KEY (el_index(60)) ) TYPE=InnoDB;   --    -- Track interlanguage links    --    CREATE TABLE /*$wgDBprefix*/langlinks ( -- page_id of the referring page ll_from int(8) unsigned NOT NULL default '0', -- Language code of the target ll_lang varchar(10) binary NOT NULL default '', -- Title of the target, including namespace ll_title varchar(255) binary NOT NULL default '', UNIQUE KEY (ll_from, ll_lang), KEY (ll_lang, ll_title) ) TYPE=InnoDB;   --    -- Contains a single row with some aggregate info    -- on the state of the site.    --    CREATE TABLE /*$wgDBprefix*/site_stats ( -- The single row should contain 1 here. ss_row_id int(8) unsigned NOT NULL, -- Total number of page views, if hit counters are enabled. ss_total_views bigint(20) unsigned default '0', -- Total number of edits performed. ss_total_edits bigint(20) unsigned default '0', -- An approximate count of pages matching the following criteria: -- * in namespace 0 -- * not a redirect -- * contains the text '[['     -- See Article::isCountable in includes/Article.php      ss_good_articles bigint(20) unsigned default '0',      -- Total pages, theoretically equal to SELECT COUNT(*) FROM page; except faster      ss_total_pages bigint(20) default '-1',      -- Number of users, theoretically equal to SELECT COUNT(*) FROM user;      ss_users bigint(20) default '-1',      -- Deprecated, no longer updated as of 1.5      ss_admins int(10) default '-1',      -- Number of images, equivalent to SELECT COUNT(*) FROM image      ss_images int(10) default '0',      UNIQUE KEY ss_row_id (ss_row_id)    ) TYPE=InnoDB;    --    -- Stores an ID for every time any article is visited;    -- depending on $wgHitcounterUpdateFreq, it is    -- periodically cleared and the page_counter column    -- in the page table updated for the all articles    -- that have been visited.)    --    CREATE TABLE /*$wgDBprefix*/hitcounter (      hc_id INTEGER UNSIGNED NOT NULL    ) TYPE=HEAP MAX_ROWS=25000;    --    -- The internet is full of jerks, alas. Sometimes it's handy    -- to block a vandal or troll account.    --    CREATE TABLE /*$wgDBprefix*/ipblocks (      -- Primary key, introduced for privacy.      ipb_id int(8) NOT NULL auto_increment,      -- Blocked IP address in dotted-quad form or user name.      ipb_address varchar(40) binary NOT NULL default ,      -- Blocked user ID or 0 for IP blocks.      ipb_user int(8) unsigned NOT NULL default '0',      -- User ID who made the block.      ipb_by int(8) unsigned NOT NULL default '0',      -- Text comment made by blocker.      ipb_reason tinyblob NOT NULL default ,      -- Creation (or refresh) date in standard YMDHMS form.      -- IP blocks expire automatically.      ipb_timestamp char(14) binary NOT NULL default ,      -- Indicates that the IP address was banned because a banned      -- user accessed a page through it. If this is 1, ipb_address      -- will be hidden, and the block identified by block ID number.      ipb_auto tinyint(1) NOT NULL default '0',      -- Time at which the block will expire.      ipb_expiry char(14) binary NOT NULL default ,      -- Start and end of an address range, in hexadecimal      -- Size chosen to allow IPv6      ipb_range_start varchar(32) NOT NULL default ,      ipb_range_end varchar(32) NOT NULL default ,      PRIMARY KEY ipb_id (ipb_id),      INDEX ipb_address (ipb_address),      INDEX ipb_user (ipb_user),      INDEX ipb_range (ipb_range_start(8), ipb_range_end(8))    ) TYPE=InnoDB;    --    -- Uploaded images and other files.    --    CREATE TABLE /*$wgDBprefix*/image (      -- Filename.      -- This is also the title of the associated description page,      -- which will be in namespace 6 (NS_IMAGE).      img_name varchar(255) binary NOT NULL default ,      -- File size in bytes.      img_size int(8) unsigned NOT NULL default '0',      -- For images, size in pixels.      img_width int(5)  NOT NULL default '0',      img_height int(5)  NOT NULL default '0',      -- Extracted EXIF metadata stored as a serialized PHP array.      img_metadata mediumblob NOT NULL,      -- For images, bits per pixel if known.      img_bits int(3)  NOT NULL default '0',      -- Media type as defined by the MEDIATYPE_xxx constants      img_media_type ENUM("UNKNOWN", "BITMAP", "DRAWING", "AUDIO", "VIDEO", "MULTIMEDIA", "OFFICE", "TEXT", "EXECUTABLE", "ARCHIVE") default NULL,      -- major part of a MIME media type as defined by IANA      -- see http://www.iana.org/assignments/media-types/      img_major_mime ENUM("unknown", "application", "audio", "image", "text", "video", "message", "model", "multipart") 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 http://www.iana.org/assignments/media-types/      img_minor_mime varchar(32) NOT NULL default "unknown",      -- Description field as entered by the uploader.      -- This is displayed in image upload history and logs.      img_description tinyblob NOT NULL default ,      -- user_id and user_name of uploader.      img_user int(5) unsigned NOT NULL default '0',      img_user_text varchar(255) binary NOT NULL default ,      -- Time of the upload.      img_timestamp char(14) binary NOT NULL default ,      PRIMARY KEY img_name (img_name),      -- Used by Special:Imagelist for sort-by-size      INDEX img_size (img_size),      -- Used by Special:Newimages and Special:Imagelist      INDEX img_timestamp (img_timestamp)    ) TYPE=InnoDB;    --    -- Previous revisions of uploaded files.    -- Awkwardly, image rows have to be moved into    -- this table at re-upload time.    --    CREATE TABLE /*$wgDBprefix*/oldimage (      -- Base filename: key to image.img_name      oi_name varchar(255) binary NOT NULL default ,      -- Filename of the archived file.      -- This is generally a timestamp and '!' prepended to the base name.      oi_archive_name varchar(255) binary NOT NULL default ,      -- Other fields as in image...      oi_size int(8) unsigned NOT NULL default 0,      oi_width int(5) NOT NULL default 0,      oi_height int(5) NOT NULL default 0,      oi_bits int(3) NOT NULL default 0,      oi_description tinyblob NOT NULL default ,      oi_user int(5) unsigned NOT NULL default '0',      oi_user_text varchar(255) binary NOT NULL default ,      oi_timestamp char(14) binary NOT NULL default ,      INDEX oi_name (oi_name(10))    ) TYPE=InnoDB;    --    -- Record of deleted file data    --    CREATE TABLE /*$wgDBprefix*/filearchive (      -- Unique row id      fa_id int not null auto_increment,      -- Original base filename; key to image.img_name, page.page_title, etc      fa_name varchar(255) binary NOT NULL default ,      -- Filename of archived file, if an old revision      fa_archive_name varchar(255) binary 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 varchar(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 varchar(64) binary default ,      -- Deletion information, if this file is deleted.      fa_deleted_user int,      fa_deleted_timestamp char(14) binary default ,      fa_deleted_reason text,      -- Duped fields from image      fa_size int(8) unsigned default '0',      fa_width int(5)  default '0',      fa_height int(5)  default '0',      fa_metadata mediumblob,      fa_bits int(3)  default '0',      fa_media_type ENUM("UNKNOWN", "BITMAP", "DRAWING", "AUDIO", "VIDEO", "MULTIMEDIA", "OFFICE", "TEXT", "EXECUTABLE", "ARCHIVE") default NULL,      fa_major_mime ENUM("unknown", "application", "audio", "image", "text", "video", "message", "model", "multipart") default "unknown",      fa_minor_mime varchar(32) default "unknown",      fa_description tinyblob default ,      fa_user int(5) unsigned default '0',      fa_user_text varchar(255) binary default ,      fa_timestamp char(14) binary default ,      PRIMARY KEY (fa_id),      INDEX (fa_name, fa_timestamp),             -- pick out by image name      INDEX (fa_storage_group, fa_storage_key),  -- pick out dupe files      INDEX (fa_deleted_timestamp),              -- sort by deletion time      INDEX (fa_deleted_user)                    -- sort by deleter    ) TYPE=InnoDB;    --    -- 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 /*$wgDBprefix*/recentchanges (      rc_id int(8) NOT NULL auto_increment,      rc_timestamp varchar(14) binary NOT NULL default ,      rc_cur_time varchar(14) binary NOT NULL default ,      -- As in revision      rc_user int(10) unsigned NOT NULL default '0',      rc_user_text varchar(255) binary NOT NULL default ,      -- When pages are renamed, their RC entries do _not_ change.      rc_namespace int NOT NULL default '0',      rc_title varchar(255) binary NOT NULL default ,      -- as in revision...      rc_comment varchar(255) binary NOT NULL default ,      rc_minor tinyint(3) unsigned 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 tinyint(3) unsigned NOT NULL default '0',      rc_new tinyint(3) unsigned 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(10) unsigned NOT NULL default '0',      -- rev_id of the given revision      rc_this_oldid int(10) unsigned NOT NULL default '0',      -- rev_id of the prior revision, for generating diff links.      rc_last_oldid int(10) unsigned NOT NULL default '0',      -- These may no longer be used, with the new move log.      rc_type tinyint(3) unsigned NOT NULL default '0',      rc_moved_to_ns tinyint(3) unsigned NOT NULL default '0',      rc_moved_to_title varchar(255) binary 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.      rc_patrolled tinyint(3) unsigned NOT NULL default '0',      -- Recorded IP address the edit was made from, if the      -- $wgPutIPinRC option is enabled.      rc_ip char(15) NOT NULL default ,      PRIMARY KEY rc_id (rc_id),      INDEX rc_timestamp (rc_timestamp),      INDEX rc_namespace_title (rc_namespace, rc_title),      INDEX rc_cur_id (rc_cur_id),      INDEX new_name_timestamp(rc_new,rc_namespace,rc_timestamp),      INDEX rc_ip (rc_ip)    ) TYPE=InnoDB;    CREATE TABLE /*$wgDBprefix*/watchlist (      -- Key to user.user_id      wl_user int(5) unsigned NOT NULL,      -- 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 varchar(255) binary NOT NULL default ,      -- Timestamp when user was last sent a notification e-mail;      -- cleared when the user visits the page.      wl_notificationtimestamp varchar(14) binary,      UNIQUE KEY (wl_user, wl_namespace, wl_title),      KEY namespace_title (wl_namespace,wl_title)    ) TYPE=InnoDB;    --    -- Used by the math module to keep track    -- of previously-rendered items.    --    CREATE TABLE /*$wgDBprefix*/math (      -- Binary MD5 hash of the latex fragment, used as an identifier key.      math_inputhash varchar(16) NOT NULL,      -- Not sure what this is, exactly...      math_outputhash varchar(16) NOT NULL,      -- texvc reports how well it thinks the HTML conversion worked;      -- if it's a low level the PNG rendering may be preferred.      math_html_conservativeness tinyint(1) NOT NULL,      -- HTML output from texvc, if any      math_html text,      -- MathML output from texvc, if any      math_mathml text,      UNIQUE KEY math_inputhash (math_inputhash)    ) TYPE=InnoDB;    --    -- When using the default MySQL search backend, page titles    -- and text are munged to strip markup, do Unicode case folding,    -- and prepare the result for MySQL's fulltext index.    --    -- This table must be MyISAM; InnoDB does not support the needed    -- fulltext index.    --    CREATE TABLE /*$wgDBprefix*/searchindex (      -- Key to page_id      si_page int(8) unsigned NOT NULL,      -- Munged version of title      si_title varchar(255) NOT NULL default ,      -- Munged version of body text      si_text mediumtext NOT NULL default ,      UNIQUE KEY (si_page),      FULLTEXT si_title (si_title),      FULLTEXT si_text (si_text)    ) TYPE=MyISAM;    --    -- Recognized interwiki link prefixes    --    CREATE TABLE /*$wgDBprefix*/interwiki (      -- The interwiki prefix, (e.g. "Meatball", or the language prefix "de")      iw_prefix char(32) NOT NULL,      -- The URL of the wiki, with "$1" as a placeholder for an article name.      -- Any spaces in the name will be transformed to underscores before      -- insertion.      iw_url char(127) NOT NULL,      -- A boolean value indicating whether the wiki is in this project      -- (used, for example, to detect redirect loops)      iw_local BOOL NOT NULL,      -- Boolean value indicating whether interwiki transclusions are allowed.      iw_trans TINYINT(1) NOT NULL DEFAULT 0,      UNIQUE KEY iw_prefix (iw_prefix)    ) TYPE=InnoDB;    --    -- Used for caching expensive grouped queries    --    CREATE TABLE /*$wgDBprefix*/querycache (      -- A key name, generally the base name of of the special page.      qc_type char(32) NOT NULL,      -- Some sort of stored value. Sizes, counts...      qc_value int(5) unsigned NOT NULL default '0',      -- Target namespace+title      qc_namespace int NOT NULL default '0',      qc_title char(255) binary NOT NULL default ,      KEY (qc_type,qc_value)    ) TYPE=InnoDB;    --    -- For a few generic cache operations if not using Memcached    --    CREATE TABLE /*$wgDBprefix*/objectcache (      keyname char(255) binary not null default ,      value mediumblob,      exptime datetime,      unique key (keyname),      key (exptime)    ) TYPE=InnoDB;    --    -- Cache of interwiki transclusion    --    CREATE TABLE /*$wgDBprefix*/transcache (            tc_url          VARCHAR(255) NOT NULL,            tc_contents     TEXT,            tc_time         INT NOT NULL,            UNIQUE INDEX tc_url_idx(tc_url)    ) TYPE=InnoDB;    CREATE TABLE /*$wgDBprefix*/logging (      -- Symbolic keys for the general log type and the action type      -- within the log. The output format will be controlled by the      -- action field, but only the type controls categorization.      log_type char(10) NOT NULL default ,      log_action char(10) NOT NULL default ,      -- Timestamp. Duh.      log_timestamp char(14) NOT NULL default '19700101000000',      -- The user who performed this action; key to user_id      log_user int unsigned NOT NULL default 0,      -- Key to the page affected. Where a user is the target,      -- this will point to the user page.      log_namespace int NOT NULL default 0,      log_title varchar(255) binary NOT NULL default ,      -- Freeform text. Interpreted as edit history comments.      log_comment varchar(255) NOT NULL default ,      -- LF separated list of miscellaneous parameters      log_params blob NOT NULL default ,      KEY type_time (log_type, log_timestamp),      KEY user_time (log_user, log_timestamp),      KEY page_time (log_namespace, log_title, log_timestamp),      KEY times (log_timestamp)    ) TYPE=InnoDB;    CREATE TABLE /*$wgDBprefix*/trackbacks (            tb_id integer AUTO_INCREMENT PRIMARY KEY,            tb_page integer REFERENCES page(page_id) ON DELETE CASCADE,            tb_title varchar(255) NOT NULL,            tb_url  varchar(255) NOT NULL,            tb_ex text,            tb_name varchar(255),            INDEX (tb_page)    ) TYPE=InnoDB;    -- Jobs performed by parallel apache threads or a command-line daemon    CREATE TABLE /*$wgDBprefix*/job (      job_id int(9) unsigned NOT NULL auto_increment,      -- Command name, currently only refreshLinks is defined      job_cmd varchar(255) NOT NULL default ,      -- Namespace and title to act on      -- Should be 0 and  if the command does not operate on a title      job_namespace int NOT NULL,      job_title varchar(255) binary NOT NULL,      -- Any other parameters to the command      -- Presently unused, format undefined      job_params blob NOT NULL default ,      PRIMARY KEY job_id (job_id),      KEY (job_cmd, job_namespace, job_title)    ) TYPE=InnoDB;    -- Details of updates to cached special pages    CREATE TABLE /*$wgDBprefix*/querycache_info (            -- Special page name            -- Corresponds to a qc_type value            qci_type varchar(32) NOT NULL default '',            -- Timestamp of last update            qci_timestamp char(14) NOT NULL default '19700101000000',            UNIQUE KEY ( qci_type )    ) TYPE=InnoDB;