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MDL-38314 repository: Improving performance of upgrade script

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This commit is contained in:
Frederic Massart 2013-07-03 16:03:46 +08:00
parent 65ef774544
commit 0193dd1c32
1 changed files with 11 additions and 6 deletions
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17
lib/db/upgrade.php
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@ -2193,12 +2193,17 @@ function xmldb_main_upgrade($oldversion) {
if ($oldversion < 2013062700.01) {
// Remove orphan repository instances.
$sql = 'SELECT contextid FROM {repository_instances} ri
WHERE NOT EXISTS (
SELECT id FROM {context} c
WHERE c.id = ri.contextid)';
$ids = $DB->get_fieldset_sql($sql);
$DB->delete_records_list('repository_instances', 'contextid', $ids);
if ($DB->get_dbfamily() === 'mysql') {
$sql = "DELETE {repository_instances} FROM {repository_instances}
LEFT JOIN {context} ON {context}.id = {repository_instances}.contextid
WHERE {context}.id IS NULL";
} else {
$sql = "DELETE FROM {repository_instances}
WHERE NOT EXISTS (
SELECT 'x' FROM {context}
WHERE {context}.id = {repository_instances}.contextid)";
}
$DB->execute($sql);
// Main savepoint reached.
upgrade_main_savepoint(true, 2013062700.01);