Mysql 执行计划分析
2016-06-02 15:36
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zjdev 正常访问； mysql> explain SELECT temp.* , -> (SELECT COUNT(sn) FROM AssignClientManager WHERE FIND_IN_SET(clientManagerSn,temp.managerSnlist)>0) clientAccount, -> (SELECT -> IFNULL(SUM(capitalBalance), 0) + IFNULL(SUM(yieldBalance), 0) -> FROM -> ProductRepayment pr ,ProductRepay p -> WHERE -> pr.productSn = p.productSn AND -> pr.clientSn IN (SELECT clientSn FROM AssignClientManager WHERE FIND_IN_SET(clientManagerSn,temp.managerSnlist)>0 ) -> AND pr.status = 1 AND DATEDIFF(p.realValueEndDate,CURDATE()) <=7 AND DATEDIFF(p.realValueEndDate,CURDATE())>=0 -> ) investBalance, -> (SELECT -> IFNULL(SUM(capitalBalance), 0) + IFNULL(SUM(yieldBalance), 0) + temp.availableBalance + temp.frozenWithDraw + temp.frozenPay -> FROM -> ProductRepayment -> WHERE -> clientSn = temp.sn IN (SELECT clientSn FROM AssignClientManager WHERE FIND_IN_SET(clientManagerSn,temp.managerSnlist)>0 ) -> AND STATUS = 1) totalBalance, -> (SELECT -> IFNULL(SUM(capitalBalance), 0) + IFNULL(SUM(yieldBalance), 0) -> FROM -> ProductRepayment pr -> WHERE -> pr.clientSn IN (SELECT clientSn FROM AssignClientManager WHERE FIND_IN_SET(clientManagerSn,temp.managerSnlist)>0 ) AND pr.status =1 -> ) unclearedBalance -> FROM( -> SELECT c.sn,cm.`parent`,c.`mobilePhone`,c.`userNick`,cp.`personName`,loadTreeByParent(cm.sn) AS managerSnlist, -> cai.`availableBalance`,cai.`frozenWithDraw`,cai.`frozenPay` -> FROM `Client` c -> LEFT JOIN ClientManager cm ON c.`sn` = cm.`sn` -> LEFT JOIN ClientPersonalInfo cp ON cp.`clientSn` = c.`sn` -> LEFT JOIN ClientAssetInfo cai ON cai.`clientSn` = c.`sn` -> WHERE cm.parent = 1496 ) temp -> ; +----+--------------------+---------------------+--------+---------------+---------+---------+-------------------+------+-------------------------------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+--------------------+---------------------+--------+---------------+---------+---------+-------------------+------+-------------------------------------------------------------------+ | 1 | PRIMARY | <derived9> | ALL | NULL | NULL | NULL | NULL | 56 | NULL | | 9 | DERIVED | cm | ALL | PRIMARY | NULL | NULL | NULL | 56 | Using where | | 9 | DERIVED | c | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | NULL | | 9 | DERIVED | cp | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | NULL | | 9 | DERIVED | cai | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | NULL | | 7 | DEPENDENT SUBQUERY | AssignClientManager | ALL | NULL | NULL | NULL | NULL | 2126 | Using where; Start temporary | | 7 | DEPENDENT SUBQUERY | pr | ALL | NULL | NULL | NULL | NULL | 5699 | Using where; End temporary; Using join buffer (Block Nested Loop) | | 5 | DEPENDENT SUBQUERY | ProductRepayment | ALL | NULL | NULL | NULL | NULL | 5699 | Using where | | 6 | DEPENDENT SUBQUERY | AssignClientManager | ALL | NULL | NULL | NULL | NULL | 2126 | Using where | | 3 | DEPENDENT SUBQUERY | pr | ALL | NULL | NULL | NULL | NULL | 5699 | Using where | | 3 | DEPENDENT SUBQUERY | p | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.pr.productSn | 1 | Using where | | 3 | DEPENDENT SUBQUERY | AssignClientManager | ALL | NULL | NULL | NULL | NULL | 2126 | Using where; FirstMatch(p); Using join buffer (Block Nested Loop) | | 2 | DEPENDENT SUBQUERY | AssignClientManager | ALL | NULL | NULL | NULL | NULL | 2126 | Using where | +----+--------------------+---------------------+--------+---------------+---------+---------+-------------------+------+-------------------------------------------------------------------+ 13 rows in set (0.00 sec) mysql select_type : <derived9> 派生表 DERIVED：被驱动的SELECT子查询（子查询位于FROM子句） DEPENDENT SUBQUERY：子查询中首个SELECT，但依赖于外层的表（如果有多个子查询存在） +----+--------------------+---------------------+------------+--------+---------------+---------+---------+-------------------+------+----------+--------------------------------------------------------------------+ | id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra | +----+--------------------+---------------------+------------+--------+---------------+---------+---------+-------------------+------+----------+--------------------------------------------------------------------+ | 1 | PRIMARY | cm | NULL | ALL | PRIMARY | NULL | NULL | NULL | 92 | 10.00 | Using where | | 1 | PRIMARY | c | NULL | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | 100.00 | NULL | | 1 | PRIMARY | cp | NULL | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | 100.00 | NULL | | 1 | PRIMARY | cai | NULL | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | 100.00 | NULL | | 7 | DEPENDENT SUBQUERY | pr | NULL | ALL | NULL | NULL | NULL | NULL | 7559 | 10.00 | Using where | | 7 | DEPENDENT SUBQUERY | AssignClientManager | NULL | ALL | NULL | NULL | NULL | NULL | 2817 | 10.00 | Using where; FirstMatch(pr); Using join buffer (Block Nested Loop) | | 5 | DEPENDENT SUBQUERY | ProductRepayment | NULL | ALL | NULL | NULL | NULL | NULL | 7559 | 1.00 | Using where | | 6 | DEPENDENT SUBQUERY | AssignClientManager | NULL | ALL | NULL | NULL | NULL | NULL | 2817 | 10.00 | Using where | | 3 | DEPENDENT SUBQUERY | pr | NULL | ALL | NULL | NULL | NULL | NULL | 7559 | 10.00 | Using where | | 3 | DEPENDENT SUBQUERY | p | NULL | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.pr.productSn | 1 | 100.00 | Using where | | 3 | DEPENDENT SUBQUERY | AssignClientManager | NULL | ALL | NULL | NULL | NULL | NULL | 2817 | 10.00 | Using where; FirstMatch(p); Using join buffer (Block Nested Loop) | | 2 | DEPENDENT SUBQUERY | AssignClientManager | NULL | ALL | NULL | NULL | NULL | NULL | 2817 | 100.00 | Using where | +----+--------------------+---------------------+------------+--------+---------------+---------+---------+-------------------+------+----------+--------------------------------------------------------------------+ mysql> explain SELECT temp.* , -> (SELECT COUNT(sn) FROM AssignClientManager WHERE FIND_IN_SET(clientManagerSn,temp.managerSnlist)>0) clientAccount -> -> -> FROM ( -> SELECT c.sn,cm.`parent`,c.`mobilePhone`,c.`userNick`,cp.`personName`,loadTreeByParent(cm.sn) AS managerSnlist, -> cai.`availableBalance`,cai.`frozenWithDraw`,cai.`frozenPay` -> FROM `Client` c -> LEFT JOIN ClientManager cm ON c.`sn` = cm.`sn` -> LEFT JOIN ClientPersonalInfo cp ON cp.`clientSn` = c.`sn` -> LEFT JOIN ClientAssetInfo cai ON cai.`clientSn` = c.`sn` -> WHERE cm.parent = 1496 ) temp -> ; +----+--------------------+---------------------+------------+--------+---------------+---------+---------+------------+------+----------+-------------+ | id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra | +----+--------------------+---------------------+------------+--------+---------------+---------+---------+------------+------+----------+-------------+ | 1 | PRIMARY | cm | NULL | ALL | PRIMARY | NULL | NULL | NULL | 92 | 10.00 | Using where | | 1 | PRIMARY | c | NULL | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | 100.00 | NULL | | 1 | PRIMARY | cp | NULL | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | 100.00 | NULL | | 1 | PRIMARY | cai | NULL | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | 100.00 | NULL | | 2 | DEPENDENT SUBQUERY | AssignClientManager | NULL | ALL | NULL | NULL | NULL | NULL | 2817 | 100.00 | Using where | +----+--------------------+---------------------+------------+--------+---------------+---------+---------+------------+------+----------+-------------+ 5 rows in set, 2 warnings (0.02 sec) DEPENDENT SUBQUERY | AssignClientManager 表示依赖子查询 所以这里是1驱动2 type ALL 全表扫描，MySQL 从头到尾扫描整张表查找行。 mysql> explain SELECT temp.* , -> (SELECT COUNT(sn) FROM AssignClientManager WHERE FIND_IN_SET(clientManagerSn,temp.managerSnlist)>0) clientAccount -> -> -> FROM ( -> SELECT c.sn,cm.`parent`,c.`mobilePhone`,c.`userNick`,cp.`personName`,loadTreeByParent(cm.sn) AS managerSnlist, -> cai.`availableBalance`,cai.`frozenWithDraw`,cai.`frozenPay` -> FROM `Client` c -> LEFT JOIN ClientManager cm ON c.`sn` = cm.`sn` -> LEFT JOIN ClientPersonalInfo cp ON cp.`clientSn` = c.`sn` -> LEFT JOIN ClientAssetInfo cai ON cai.`clientSn` = c.`sn` -> WHERE cm.parent = 1496 ) temp -> ; +----+--------------------+---------------------+--------+---------------+---------+---------+------------+------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+--------------------+---------------------+--------+---------------+---------+---------+------------+------+-------------+ | 1 | PRIMARY | <derived3> | ALL | NULL | NULL | NULL | NULL | 56 | NULL | | 3 | DERIVED | cm | ALL | PRIMARY | NULL | NULL | NULL | 56 | Using where | | 3 | DERIVED | c | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | NULL | | 3 | DERIVED | cp | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | NULL | | 3 | DERIVED | cai | eq_ref | PRIMARY | PRIMARY | 4 | zjzc.cm.sn | 1 | NULL | | 2 | DEPENDENT SUBQUERY | AssignClientManager | ALL | NULL | NULL | NULL | NULL | 2126 | Using where | +----+--------------------+---------------------+--------+---------------+---------+---------+------------+------+-------------+ 6 rows in set (0.00 sec) 这里 DEPENDENT SUBQUERY | AssignClientManager 驱动表是3 id是一组数字，表示查询中执行select子句或操作表的顺序。 如果id相同，则执行顺序从上至下。 如果是子查询，id的序号会递增，id越大则优先级越高，越先会被执行。 id如果相同，则可以认为是一组，从上往下顺序执行，所有组中，id越高，优先级越高，越容易执行。 驱动表为ID=3 cm: cm，c，cp cai执行出来的结果 再去驱动2 id为3 出来的结果 就是1 <derived3> 指向3 表示 是3产生的派生表 mysql> explain SELECT COUNT(sn) FROM AssignClientManager where clientSn>5; +----+-------------+---------------------+------------+------+---------------+------+---------+------+------+----------+-------------+ | id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra | +----+-------------+---------------------+------------+------+---------------+------+---------+------+------+----------+-------------+ | 1 | SIMPLE | AssignClientManager | NULL | ALL | NULL | NULL | NULL | NULL | 2817 | 33.33 | Using where | +----+-------------+---------------------+------------+------+---------------+------+---------+------+------+----------+-------------+ type ALL 全表扫描，MySQL 从头到尾扫描整张表查找行。
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