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Add a missing table key to improve performance of "Recently Completed Tasks" query

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Summary:
Fixes T11490. Currently, this query can not use a key and the table size may be quite large.

Adjust the query so it can use a key for both selection and ordering, and add that key.

Test Plan: Ran `EXPLAIN` on the old query in production, then added the key and ran `EXPLAIN` on the new query. Saw key in use, and "rows" examined drop from 29,273 to 15.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11490

Differential Revision: https://secure.phabricator.com/D16423
This commit is contained in:
epriestley 2016-08-19 11:29:28 -07:00
parent 4d175ac709
commit 3bd0da0ec2
2 changed files with 5 additions and 0 deletions
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2
src/infrastructure/daemon/workers/query/PhabricatorWorkerArchiveTaskQuery.php
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@ -104,6 +104,8 @@ final class PhabricatorWorkerArchiveTaskQuery
if ($this->dateCreatedBefore) {
return qsprintf($conn_r, 'ORDER BY dateCreated DESC, id DESC');
} else if ($this->dateModifiedSince) {
return qsprintf($conn_r, 'ORDER BY dateModified DESC, id DESC');
} else {
return qsprintf($conn_r, 'ORDER BY id DESC');
}

3
src/infrastructure/daemon/workers/storage/PhabricatorWorkerArchiveTask.php
View file

@ -31,6 +31,9 @@ final class PhabricatorWorkerArchiveTask extends PhabricatorWorkerTask {
'leaseOwner' => array(
'columns' => array('leaseOwner', 'priority', 'id'),
),
'key_modified' => array(
'columns' => array('dateModified'),
),
) + $parent[self::CONFIG_KEY_SCHEMA];
return $config;