Manual:$wgAntiLockFlags

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Miscellaneous settings: $wgAntiLockFlags
Anti-lock flags.
Introduced in version: 1.4.0
Removed in version: 1.25.0 (Gerrit #Ia709cc; git #12757b50)
Allowed values: bitfield - see below
Default value: 0
Other settings: Alphabetical | By function

Details[edit]

Anti-lock flags. This is a bitfield. The constants are set in Defines.php.

ALF_PRELOAD_LINKS 
Preload links during link update for save. (This option has no effect since 1.6.0)
ALF_PRELOAD_EXISTENCE 
Preload cur_id during replaceLinkHolders. (This option has no effect since 1.5.0)
ALF_NO_LINK_LOCK 
Don't use locking reads when updating the link table. This is necessary for wikis with a high edit rate for performance reasons, but may cause link table inconsistency. (This option was introduced in 1.5.0)
ALF_NO_BLOCK_LOCK 
As for ALF_LINK_LOCK, this flag is a necessity for high-traffic wikis. (This option was introduced in 1.5.0 and has no effect since 1.18.0)

Example[edit]

To reduce lock contention, at the expense of introducing occasional inconsistencies, set:

$wgAntiLockFlags = ALF_NO_LINK_LOCK | ALF_NO_BLOCK_LOCK;