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Performance breakthrough

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Improvement in the Purge method for huge performance increase.
"WHERE ref_id IS NOT NULL" is needed by pgsql, not necessarily by mysql.
This is a more standard way to make deletions based on propagation (from ttrss_user_entries) with 1-to-N relations.
This commit is contained in:
GregThib 2015-07-13 12:03:50 +02:00
parent f45b67c53e
commit c291685654
1 changed files with 1 additions and 2 deletions
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3
include/functions.php
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@ -320,8 +320,7 @@
// purge orphaned posts in main content table // purge orphaned posts in main content table
$result = db_query("DELETE FROM ttrss_entries WHERE $result = db_query("DELETE FROM ttrss_entries WHERE
(SELECT COUNT(int_id) FROM ttrss_user_entries WHERE ref_id = id) = 0"); id NOT IN (SELECT ref_id FROM ttrss_user_entries WHERE ref_id IS NOT NULL)");
if ($do_output) { if ($do_output) {
$rows = db_affected_rows($result); $rows = db_affected_rows($result);
_debug("Purged $rows orphaned posts."); _debug("Purged $rows orphaned posts.");