Question

将mySQL服务器从5.6升级到5.7时，在vbb5上运行的论坛似乎变得非常慢。查看缓慢的查询文件，看来行扫描比以前慢得多。

下面是典型的论坛查询，该查询在大约1到3秒之前运行，现在运行时间在30到75秒之间。节点表和关闭表分别保存11至1300万条记录。我已经在两个表上执行了表优化。

/**
 * Display Product Image in WooCommerce Order Emails
 * 
 * @author James Kemp (Iconic)
 */
add_filter( 'woocommerce_email_order_items_args', 'iconic_email_order_items_args', 10, 1 );

function iconic_email_order_items_args( $args ) {

    $args['show_image'] = true;

    return $args;

}

我在my.cnf设置上玩过一点，但对提高性能仍然不满意：

# Query_time: 56.239686  Lock_time: 0.000452 Rows_sent: 500  Rows_examined: 672441
SELECT DISTINCT node.starter AS nodeid
                        FROM node as node
                        LEFT JOIN node AS starter ON starter.nodeid = IF(node.starter = 0, node.nodeid, node.starter)
                                JOIN closure AS closure  ON node.nodeid = closure.child
                        WHERE node.contenttypeid <> 30 AND
                                closure.parent = '47' AND
                                node.nodeid <> closure.parent AND
                                node.inlist = 1 AND
                                node.contenttypeid <> '15' AND
                                node.protected <> '1'
AND (node.public_preview = 1 OR  ( ( (  (starter.parentid IN (13,22,1,2,24,27,33,47,49,62,14,25,28,32,50,52,70,15,29,31,40,44,63,69,6,16,37,38,43,46,51,53,17,30,39,54,55,67,12,18,23,26,34,42,45,20,21,41,48,56,61,82,80,72,79,77,78,76,75,74,68,73,3629857,3654649) ) AND node.showapproved > 0 AND node.viewperms > 1 AND node.showpublished > 0 ))
 OR starter.parentid = 9 AND node.userid IN (0)))


                        ORDER BY starter.created DESC,node.nodeid ASC
                        LIMIT 500

有人暗示我应该看什么吗？

从5.6升级到5.7后，查询速度极慢

0 个答案: