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Add a missing table key to improve performance of "Recently Completed Tasks" query
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
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@ -104,6 +104,8 @@ final class PhabricatorWorkerArchiveTaskQuery
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if ($this->dateCreatedBefore) {
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return qsprintf($conn_r, 'ORDER BY dateCreated DESC, id DESC');
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} else if ($this->dateModifiedSince) {
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return qsprintf($conn_r, 'ORDER BY dateModified DESC, id DESC');
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} else {
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return qsprintf($conn_r, 'ORDER BY id DESC');
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}
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@ -31,6 +31,9 @@ final class PhabricatorWorkerArchiveTask extends PhabricatorWorkerTask {
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'leaseOwner' => array(
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'columns' => array('leaseOwner', 'priority', 'id'),
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),
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'key_modified' => array(
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'columns' => array('dateModified'),
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),
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) + $parent[self::CONFIG_KEY_SCHEMA];
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return $config;
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