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MDL-59317 message: Message page taking long time to load

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The OR clause in these queries used different sets of columns to select
userid which meant that the indexes that included user id could not be
used.

This change splits the query so that each individual part can use one of
the indexes that includes a userid which speeds them up considerably.
This commit is contained in:
Neill Magill
2017-07-06 15:28:43 +01:00
parent 59f5f4a9df
commit a7e6b097f9
1 changed files with 28 additions and 5 deletions
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message/classes/api.php
+28 -5
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@@ -283,7 +283,14 @@ class api {
FROM {message}
WHERE
(useridto = ? AND timeusertodeleted = 0 AND notification = 0)
OR
UNION ALL
SELECT
id, useridfrom, useridto, subject, fullmessage, fullmessageformat,
fullmessagehtml, smallmessage, notification, contexturl,
contexturlname, timecreated, timeuserfromdeleted, timeusertodeleted,
component, eventtype, 0 as timeread
FROM {message}
WHERE
(useridfrom = ? AND timeuserfromdeleted = 0 AND notification = 0)
UNION ALL
SELECT
@@ -294,7 +301,14 @@ class api {
FROM {message_read}
WHERE
(useridto = ? AND timeusertodeleted = 0 AND notification = 0)
OR
UNION ALL
SELECT
id, useridfrom, useridto, subject, fullmessage, fullmessageformat,
fullmessagehtml, smallmessage, notification, contexturl,
contexturlname, timecreated, timeuserfromdeleted, timeusertodeleted,
component, eventtype, timeread
FROM {message_read}
WHERE
(useridfrom = ? AND timeuserfromdeleted = 0 AND notification = 0)";
$allmessagesparams = [$userid, $userid, $userid, $userid];
@@ -350,7 +364,11 @@ class api {
FROM {message}
WHERE
(useridto = ? AND timeusertodeleted = 0 AND notification = 0)
OR
AND timecreated $timecreatedsql
UNION ALL
SELECT id, useridfrom, useridto, timecreated
FROM {message}
WHERE
(useridfrom = ? AND timeuserfromdeleted = 0 AND notification = 0)
AND timecreated $timecreatedsql
UNION ALL
@@ -358,14 +376,19 @@ class api {
FROM {message_read}
WHERE
(useridto = ? AND timeusertodeleted = 0 AND notification = 0)
OR
AND timecreated $timecreatedsql
UNION ALL
SELECT id, useridfrom, useridto, timecreated
FROM {message_read}
WHERE
(useridfrom = ? AND timeuserfromdeleted = 0 AND notification = 0)
AND timecreated $timecreatedsql";
$messageidsql = "SELECT $convosig, max(id) as id, timecreated
FROM ($allmessagestimecreated) x
WHERE $messageidwhere
GROUP BY $convocase, timecreated";
$messageidparams = array_merge([$userid, $userid], $timecreatedparams, [$userid, $userid], $timecreatedparams);
$messageidparams = array_merge([$userid], $timecreatedparams, [$userid], $timecreatedparams,
[$userid], $timecreatedparams, [$userid], $timecreatedparams);
$messageidrecords = $DB->get_records_sql($messageidsql, $messageidparams);
// Ok, let's recap. We've pulled a descending ordered list of conversations by latest time created