Mobrovac has uploaded a new change for review.
https://gerrit.wikimedia.org/r/311406
Change subject: API: Force straight join for
prop=linkshere|transcludedin|fileusage
......................................................................
API: Force straight join for prop=linkshere|transcludedin|fileusage
MySQL (or at least 5.5.5-10.0.23-MariaDB) chooses a really bad query plan if it
thinks there will be more matching rows in the linktable than are in page. Use
STRAIGHT_JOIN here to force it to use the intended, fast plan. See T145079 for
details.
Bug: T145079
Change-Id: I1a363450b818a049938145d0feb207c9894d2a49
---
M includes/api/ApiQueryBacklinksprop.php
1 file changed, 6 insertions(+), 0 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/mediawiki/core
refs/changes/06/311406/1
diff --git a/includes/api/ApiQueryBacklinksprop.php
b/includes/api/ApiQueryBacklinksprop.php
index 236fb9e..8e89c32 100644
--- a/includes/api/ApiQueryBacklinksprop.php
+++ b/includes/api/ApiQueryBacklinksprop.php
@@ -264,6 +264,12 @@
}
}
+ // MySQL (or at least 5.5.5-10.0.23-MariaDB) chooses a really
bad query
+ // plan if it thinks there will be more matching rows in the
linktable
+ // than are in page. Use STRAIGHT_JOIN here to force it to use
the
+ // intended, fast plan. See T145079 for details.
+ $this->addOption( 'STRAIGHT_JOIN' );
+
$this->addOption( 'LIMIT', $params['limit'] + 1 );
$res = $this->select( __METHOD__ );
--
To view, visit https://gerrit.wikimedia.org/r/311406
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I1a363450b818a049938145d0feb207c9894d2a49
Gerrit-PatchSet: 1
Gerrit-Project: mediawiki/core
Gerrit-Branch: wmf/1.28.0-wmf.18
Gerrit-Owner: Mobrovac <[email protected]>
Gerrit-Reviewer: Anomie <[email protected]>
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