X-Git-Url: http://git.cyclocoop.org/data/Luca_Pacioli_%28Gemaelde%29.jpeg?a=blobdiff_plain;f=maintenance%2Ftables.sql;h=c03a3b880da80ba0d9e661d007f924b33105a45c;hb=2aa6775224f830fff40bf3a55d6e0a303ce7f8e3;hp=fb8e578687836072b6c23aa45be1bd272fb978f0;hpb=e3d0c474a83c3548aa6763561826f71c12a55fe6;p=lhc%2Fweb%2Fwiklou.git

diff --git a/maintenance/tables.sql b/maintenance/tables.sql
index fb8e578687..c03a3b880d 100644
--- a/maintenance/tables.sql
+++ b/maintenance/tables.sql
@@ -1,245 +1,817 @@
--- SQL to create the initial tables for the Wikipedia database.
+-- SQL to create the initial tables for the MediaWiki database.
 -- This is read and executed by the install script; you should
--- never have to run it by itself.
+-- 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.
 --
--- Indexes should be defined here; please import the rest from indexes.sql.
 
-CREATE TABLE user (
+
+--
+-- 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 '',
-  user_rights tinyblob 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 '',
-  user_options blob 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 '',
-  UNIQUE KEY user_id (user_id)
-) PACK_KEYS=1;
-	
-CREATE TABLE user_newtalk (
-  user_id int(5) NOT NULL default '0',
-  user_ip varchar(40) NOT NULL default ''
-);
-
-CREATE TABLE cur (
-  cur_id int(8) unsigned NOT NULL auto_increment,
-  cur_namespace tinyint(2) unsigned NOT NULL default '0',
-  cur_title varchar(255) binary NOT NULL default '',
-  cur_text mediumtext NOT NULL default '',
-  cur_comment tinyblob NOT NULL default '',
-  cur_user int(5) unsigned NOT NULL default '0',
-  cur_user_text varchar(255) binary NOT NULL default '',
-  cur_timestamp char(14) binary NOT NULL default '',
-  cur_restrictions tinyblob NOT NULL default '',
-  cur_counter bigint(20) unsigned NOT NULL default '0',
-  cur_is_redirect tinyint(1) unsigned NOT NULL default '0',
-  cur_minor_edit tinyint(1) unsigned NOT NULL default '0',
-  cur_is_new tinyint(1) unsigned NOT NULL default '0',
-  cur_random real unsigned NOT NULL,
-  cur_touched char(14) binary NOT NULL default '',
-  inverse_timestamp char(14) binary NOT NULL default '',
-  UNIQUE KEY cur_id (cur_id)
-) PACK_KEYS=1;
-
-CREATE TABLE old (
+  
+  -- 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 $wgGroupPermissions will associate group keys
+  -- with particular permissions. A user will have the combined
+  -- permissions of any group they're explicitly in, plus
+  -- the implicit '*' and 'user' groups.
+  ug_group char(16) NOT NULL default '',
+  
+  PRIMARY KEY (ug_user,ug_group),
+  KEY (ug_group)
+) TYPE=InnoDB;
+
+-- The following table is no longer needed with Enotif >= 2.00
+-- Entries for newtalk on user_talk page are handled like in the watchlist table
+-- CREATE TABLE /*$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,
-  old_namespace tinyint(2) unsigned NOT NULL default '0',
-  old_title varchar(255) binary NOT NULL default '',
+  
+  -- Depending on the contents of the old_flags field, the text
+  -- may be convenient plain text, or it may be funkily encoded.
   old_text mediumtext NOT NULL default '',
-  old_comment tinyblob NOT NULL default '',
-  old_user int(5) unsigned NOT NULL default '0',
-  old_user_text varchar(255) binary NOT NULL,
-  old_timestamp char(14) binary NOT NULL default '',
-  old_minor_edit tinyint(1) NOT NULL default '0',
+  
+  -- 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 '',
-  inverse_timestamp char(14) binary NOT NULL default '',
-  UNIQUE KEY old_id (old_id)
-) PACK_KEYS=1;
+  
+  PRIMARY KEY old_id (old_id)
+
+) TYPE=InnoDB;
 
-CREATE TABLE archive (
-  ar_namespace tinyint(2) unsigned NOT NULL default '0',
+--
+-- 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.
   ar_text mediumtext 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',
-  ar_flags tinyblob NOT NULL default ''
-) PACK_KEYS=1;
+  
+  -- 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 links that do exist
--- l_from and l_to key to cur_id
---
-CREATE TABLE links (
-  l_from int(8) unsigned NOT NULL default '0',
-  l_to int(8) unsigned NOT NULL default '0',
-  UNIQUE KEY l_from(l_from,l_to),
-  KEY (l_to)
-);
 
 --
--- Track links to pages that don't yet exist.
--- bl_from keys to cur_id
--- bl_to is a text link (namespace:title)
+-- Track page-to-page hyperlinks within the wiki.
 --
-CREATE TABLE brokenlinks (
-  bl_from int(8) unsigned NOT NULL default '0',
-  bl_to varchar(255) binary NOT NULL default '',
-  UNIQUE KEY bl_from(bl_from,bl_to),
-  KEY (bl_to)
-);
+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*
--- il_from keys to cur_id, il_to keys to image_name.
--- We don't distinguish live from broken links.
+-- We don't distinguish live from broken links here, so
+-- they do not need to be changed on upload/removal.
 --
-CREATE TABLE imagelinks (
+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*
--- cl_from keys to cur_id, cl_to keys to cur_title of the category page.
--- cl_sortkey is the title of the linking page or an optional override
--- cl_timestamp marks when the link was last added
+-- This tracks a single level of category membership
+-- (folksonomic tagging, really).
 --
-CREATE TABLE categorylinks (
+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 '',
-  cl_sortkey 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),
-  KEY cl_sortkey(cl_to,cl_sortkey(128)),
+  
+  -- 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;
 
 --
--- Stores (possibly gzipped) serialized objects with
--- cache arrays to reduce database load slurping up
--- from links and brokenlinks.
+-- Contains a single row with some aggregate info
+-- on the state of the site.
 --
-CREATE TABLE linkscc (
-  lcc_pageid INT UNSIGNED NOT NULL UNIQUE KEY,
-  lcc_cacheobj MEDIUMBLOB NOT NULL
-);
-
-CREATE TABLE site_stats (
+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',
+  
   UNIQUE KEY ss_row_id (ss_row_id)
-);
 
-CREATE TABLE hitcounter (
+) TYPE=InnoDB;
+
+--
+-- Stores an ID for every time any article is visited;
+-- depending on $wgHitcounterUpdateFreq, it is
+-- periodically cleared and the cur_counter column
+-- in the cur table updated for the all articles
+-- that have been visited.)
+--
+CREATE TABLE /*$wgDBprefix*/hitcounter (
   hc_id INTEGER UNSIGNED NOT NULL
 ) TYPE=HEAP MAX_ROWS=25000;
 
-CREATE TABLE ipblocks (
+
+--
+-- 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 '',
-  UNIQUE KEY ipb_id (ipb_id)
-) PACK_KEYS=1;
 
-CREATE TABLE image (
+  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 '',
-  img_timestamp char(14) binary NOT NULL default ''
-) PACK_KEYS=1;
+  
+  -- 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;
 
-CREATE TABLE oldimage (
+--
+-- 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 ''
-) PACK_KEYS=1;
+  oi_timestamp char(14) binary NOT NULL default '',
+
+  INDEX oi_name (oi_name(10))
+
+) TYPE=InnoDB;
 
-CREATE TABLE recentchanges (
+
+--
+-- 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 '',
-  rc_namespace tinyint(3) unsigned NOT NULL default '0',
+  
+  -- 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 '',
-  rc_ip char(15) NOT NULL default ''
-) PACK_KEYS=1;
+  
+  -- 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)
 
-CREATE TABLE watchlist (
+) TYPE=InnoDB;
+
+CREATE TABLE /*$wgDBprefix*/watchlist (
+  -- Key to user_id
   wl_user int(5) unsigned NOT NULL,
-  wl_namespace tinyint(2) unsigned NOT NULL default '0',
+  
+  -- 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 '',
-  UNIQUE KEY (wl_user, wl_namespace, wl_title)
-) PACK_KEYS=1;
+  
+  -- 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;
+
 
-CREATE TABLE math (
+--
+-- 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)
-);
-
 
--- Table searchindex must be MyISAM for fulltext support
+) TYPE=InnoDB;
 
-CREATE TABLE searchindex (
+--
+-- 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)
-) TYPE=MyISAM PACK_KEYS=1;
+  
+  UNIQUE KEY (si_page),
+  FULLTEXT si_title (si_title),
+  FULLTEXT si_text (si_text)
 
-CREATE TABLE interwiki (
+) 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,
+  
   UNIQUE KEY iw_prefix (iw_prefix)
-);
 
+) TYPE=InnoDB;
+
+--
 -- Used for caching expensive grouped queries
-CREATE TABLE querycache (
+--
+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',
-  qc_namespace tinyint(2) 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 objectcache (
+--
+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 '',
+  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;