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    < MediaWiki(Redirected from Mediawiki/tables)

    MediaWiki

    ./maintenance/tables.sql

    -- 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:
    --
    -- If possible, create tables as InnoDB to benefit from the
    -- superior resiliency against crashes and ability to read
    -- during writes (and write during reads!)
    --
    -- Only the 'searchindex' table requires MyISAM due to the
    -- requirement for fulltext index support, which is missing
    -- from InnoDB.
    --
    --
    -- 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.
    --
    -- Historically TIMESTAMP fields were used, but abandoned
    -- in early 2002 after a lot of trouble with the fields
    -- auto-updating.
    --
    -- The PostgreSQL backend uses DATETIME fields for timestamps,
    -- and we will migrate the MySQL definitions at some point as
    -- well.
    --
    --
    -- The /*$wgDBprefix*/ 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 $wgSharedDB setting.
    --
    -- Note that when a external authentication plugin is used,
    -- user table entries still need to be created to store
    -- preferences and to key tracking information in the other
    -- tables.
    --
    CREATE TABLE /*$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. (Conflicts?)
      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)))
      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 pairs.
      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_expires 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 (
     user_id int(5) NOT NULL default '0',
     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 Namespace.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.
      rev_comment tinyblob NOT NULL default '',
      
      -- Key to 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.
      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 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...
      --
      -- 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;
    
    --
    -- 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 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,
    
      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 '',
    
      PRIMARY KEY ipb_id (ipb_id),
      INDEX ipb_address (ipb_address),
      INDEX ipb_user (ipb_user)
    
    ) 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;
    
    
    --
    -- Primarily a summary table for Special:Recentchanges,
    -- this table contains some additional info on edits from
    -- the last few days.
    --
    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_id
      wl_user int(5) unsigned NOT NULL,
      
      -- Key to page_namespace/page_title
      -- Note that users may watch patches 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.
      -- FIXME: add proper null support etc
      wl_notificationtimestamp varchar(14) binary NOT NULL default '0',
      
      UNIQUE KEY (wl_user, wl_namespace, wl_title),
      KEY namespace_title (wl_namespace,wl_title)
    
    ) TYPE=InnoDB;
    
    
    --
    -- Used by texvc math-rendering extension 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;
    
    -- For article validation
    CREATE TABLE /*$wgDBprefix*/validate (
      val_user int(11) NOT NULL default '0',
      val_page int(11) unsigned NOT NULL default '0',
      val_revision int(11) unsigned NOT NULL default '0',
      val_type int(11) unsigned NOT NULL default '0',
      val_value int(11) default '0',
      val_comment varchar(255) NOT NULL default '',
      val_ip varchar(20) NOT NULL default '',
      KEY val_user (val_user,val_revision)
    ) 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)
    
    ) TYPE=InnoDB;
    
    
    
    
    
    -- Hold group name and description
    --CREATE TABLE /*$wgDBprefix*/groups (
    --  gr_id int(5) unsigned NOT NULL auto_increment,
    --  gr_name varchar(50) NOT NULL default '',
    --  gr_description varchar(255) NOT NULL default '',
    --  gr_rights tinyblob,
    --  PRIMARY KEY  (gr_id)
    --
    --) 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)
    );
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