Manual:$wgAntiLockFlags

Miscellaneous settings: $wgAntiLockFlags
Anti-lock flags.
Introduced in version:	1.4.0
Removed in version:	1.25.0 (Gerrit change 164115; git #12757b50)
Allowed values:	(bitfield - see below)
Default value:	0
Other settings: Alphabetical | By function

Details

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

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

$wgAntiLockFlags = ALF_NO_LINK_LOCK | ALF_NO_BLOCK_LOCK;