Magento 在 mariadb 中导致死锁
Magento causes deadlock in mariadb
我的 Magento(Vesion 1.8.0.0) 网站 运行 在我使用 MySQL5.5 数据库多年时没有任何问题。最近移动到 mariadb-server-10.2 后（使用 sqldump 导出数据，然后在新的 mariadb 服务器上导入），多次 PHP 子进程处于等待状态，直到 max_execution_time 到期，最后 php -fpm 停止响应。
经过调查，我发现所有 php 子进程都在等待数据库查询。最近遇到问题的时候查看了mariadb上的processlist，输出如下。知道我该如何解决这个问题吗？提前致谢。
MariaDB [(none)]> show processlist;
+--------+-------------+-------------------------------+---------+---------+------+------------------------------+---------------------------------------------------------------------- --------------------------------+----------+
| Id | User | Host | db | Command | Time | State | Info | Progress |
+--------+-------------+-------------------------------+---------+---------+------+------------------------------+---------------------------------------------------------------------- --------------------------------+----------+
| 1 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 2 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 4 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 3 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 5 | system user | | NULL | Daemon | NULL | InnoDB shutdown handler | NULL | 0.000 |
| 109822 | catalog | mymagentositexxxxxx.com:56405 | catalog | Query | 985 | update | INSERT INTO `cataloginventory_stock_status` (`product_id`,`website_id `,`stock_id`,`qty`,`stock_statu | 0.000 |
| 109850 | catalog | mymagentositexxxxxx.com:56436 | catalog | Query | 985 | update | INSERT INTO `cataloginventory_stock_status` (`product_id`,`website_id `,`stock_id`,`qty`,`stock_statu | 0.000 |
| 109859 | catalog | mymagentositexxxxxx.com:56448 | catalog | Query | 985 | update | INSERT INTO `cataloginventory_stock_status` (`product_id`,`website_id `,`stock_id`,`qty`,`stock_statu | 0.000 |
| 109931 | catalog | mymagentositexxxxxx.com:56554 | catalog | Query | 986 | Waiting for table level lock | DELETE FROM `catalogsearch_fulltext` WHERE (store_id=1) AND (product_ id IN ('26515')) | 0.000 |
| 109966 | catalog | mymagentositexxxxxx.com:56606 | catalog | Query | 984 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33218 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 109993 | catalog | mymagentositexxxxxx.com:56645 | catalog | Query | 934 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 109997 | catalog | mymagentositexxxxxx.com:56650 | catalog | Query | 987 | Sending data | INSERT INTO `catalogsearch_result` SELECT 33215 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110040 | catalog | mymagentositexxxxxx.com:56709 | catalog | Query | 983 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33215 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110218 | catalog | mymagentositexxxxxx.com:56925 | catalog | Query | 940 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 6656 AS `query_id`, `s`.`pr oduct_id`, 0 AS `relevance` FRO | 0.000 |
| 110248 | catalog | mymagentositexxxxxx.com:56956 | catalog | Query | 932 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33220 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110380 | catalog | mymagentositexxxxxx.com:57095 | catalog | Query | 906 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33214 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110392 | catalog | mymagentositexxxxxx.com:57107 | catalog | Query | 905 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33215 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110810 | catalog | mymagentositexxxxxx.com:57554 | catalog | Query | 825 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 6656 AS `query_id`, `s`.`pr oduct_id`, 0 AS `relevance` FRO | 0.000 |
| 110865 | catalog | mymagentositexxxxxx.com:57616 | catalog | Query | 808 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 21581 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110968 | catalog | mymagentositexxxxxx.com:57782 | catalog | Query | 48 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 110969 | catalog | mymagentositexxxxxx.com:57783 | catalog | Query | 48 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 110989 | catalog | mymagentositexxxxxx.com:57803 | catalog | Query | 39 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 110999 | catalog | mymagentositexxxxxx.com:57813 | catalog | Query | 34 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111012 | catalog | mymagentositexxxxxx.com:57867 | catalog | Query | 32 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111067 | catalog | mymagentositexxxxxx.com:57959 | catalog | Query | 18 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111077 | catalog | mymagentositexxxxxx.com:57974 | catalog | Query | 15 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111078 | root | localhost | NULL | Query | 0 | init | show processlist | 0.000 |
| 111117 | catalog | mymagentositexxxxxx.com:58015 | catalog | Query | 10 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 13226 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 111147 | moodle | mymagentositexxxxxx.com:58046 | moodle | Sleep | 0 | | NULL | 0.000 |
+--------+-------------+-------------------------------+---------+---------+------+------------------------------+---------------------------------------------------------------------- --------------------------------+----------+
29 rows in set (0.00 sec)
#update2
'Show create table output' 的 table 处于等待状态如下
MariaDB [catalog]> SHOW CREATE TABLE catalogsearch_fulltext;
+------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| catalogsearch_fulltext | CREATE TABLE `catalogsearch_fulltext` (
`product_id` int(10) unsigned NOT NULL COMMENT 'Product ID',
`store_id` smallint(5) unsigned NOT NULL COMMENT 'Store ID',
`data_index` longtext DEFAULT NULL COMMENT 'Data index',
`fulltext_id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Entity ID',
PRIMARY KEY (`fulltext_id`),
UNIQUE KEY `UNQ_CATALOGSEARCH_FULLTEXT_PRODUCT_ID_STORE_ID` (`product_id`,`store_id`),
FULLTEXT KEY `FTI_CATALOGSEARCH_FULLTEXT_DATA_INDEX` (`data_index`)
) ENGINE=MyISAM AUTO_INCREMENT=912741 DEFAULT CHARSET=utf8 COMMENT='Catalog search result table' |
+------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
MariaDB [catalog]> SHOW CREATE TABLE catalogsearch_result;
+----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| catalogsearch_result | CREATE TABLE `catalogsearch_result` (
`query_id` int(10) unsigned NOT NULL COMMENT 'Query ID',
`product_id` int(10) unsigned NOT NULL COMMENT 'Product ID',
`relevance` decimal(20,4) NOT NULL DEFAULT 0.0000 COMMENT 'Relevance',
PRIMARY KEY (`query_id`,`product_id`),
KEY `IDX_CATALOGSEARCH_RESULT_QUERY_ID` (`query_id`),
KEY `IDX_CATALOGSEARCH_RESULT_PRODUCT_ID` (`product_id`),
CONSTRAINT `FK_CATALOGSEARCH_RESULT_QUERY_ID_CATALOGSEARCH_QUERY_QUERY_ID` FOREIGN KEY (`query_id`) REFERENCES `catalogsearch_query` (`query_id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `FK_CATSRCH_RESULT_PRD_ID_CAT_PRD_ENTT_ENTT_ID` FOREIGN KEY (`product_id`) REFERENCES `catalog_product_entity` (`entity_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Catalog search result table' |
+----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
用时最多的进程 (#109997) 正在接触 MyISAM table？完成 SHOW FULL PROCESSLIST 后，我看到
INSERT
INTO `catalogsearch_result`
SELECT 11474 AS `query_id`, `s`.`product_id`, 0 AS `relevance`
FROM `catalogsearch_fulltext` AS `s`
INNER JOIN `catalog_product_entity` AS `e` ON e.entity_id = s.product_id
WHERE (s.store_id = 1)
AND ((`s`.`data_index` LIKE '%Informaatika%'
OR `s`.`data_index` LIKE '%8.c%')
) ON DUPLICATE KEY
UPDATE `relevance` = VALUES(`relevance`)
那是最近才开始的缓慢 SELECT。由于我们正在谈论 MyISAM，并且正在进行写入，因此查询将一次发生一个（大部分）。
因为 OR 和 LIKE 测试中的 leading 通配符，它很慢。您有什么方法可以避免 both 这些问题吗？有了它们，SELECT 必须扫描整个 table，这显然需要几分钟。 （table有多大？）
更改超时可能会让您超过一个实例，但只会让您处于一个永无止境的查询序列中，等待其他查询完成。
最好的解决方案是远离 MyISAM。更多提示：http://mysql.rjweb.org/doc.php/myisam2innodb
（即使转换后，也可能存在其他问题。）
我的 Magento(Vesion 1.8.0.0) 网站 运行 在我使用 MySQL5.5 数据库多年时没有任何问题。最近移动到 mariadb-server-10.2 后（使用 sqldump 导出数据，然后在新的 mariadb 服务器上导入），多次 PHP 子进程处于等待状态，直到 max_execution_time 到期，最后 php -fpm 停止响应。
经过调查，我发现所有 php 子进程都在等待数据库查询。最近遇到问题的时候查看了mariadb上的processlist，输出如下。知道我该如何解决这个问题吗？提前致谢。
MariaDB [(none)]> show processlist;
+--------+-------------+-------------------------------+---------+---------+------+------------------------------+---------------------------------------------------------------------- --------------------------------+----------+
| Id | User | Host | db | Command | Time | State | Info | Progress |
+--------+-------------+-------------------------------+---------+---------+------+------------------------------+---------------------------------------------------------------------- --------------------------------+----------+
| 1 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 2 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 4 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 3 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 5 | system user | | NULL | Daemon | NULL | InnoDB shutdown handler | NULL | 0.000 |
| 109822 | catalog | mymagentositexxxxxx.com:56405 | catalog | Query | 985 | update | INSERT INTO `cataloginventory_stock_status` (`product_id`,`website_id `,`stock_id`,`qty`,`stock_statu | 0.000 |
| 109850 | catalog | mymagentositexxxxxx.com:56436 | catalog | Query | 985 | update | INSERT INTO `cataloginventory_stock_status` (`product_id`,`website_id `,`stock_id`,`qty`,`stock_statu | 0.000 |
| 109859 | catalog | mymagentositexxxxxx.com:56448 | catalog | Query | 985 | update | INSERT INTO `cataloginventory_stock_status` (`product_id`,`website_id `,`stock_id`,`qty`,`stock_statu | 0.000 |
| 109931 | catalog | mymagentositexxxxxx.com:56554 | catalog | Query | 986 | Waiting for table level lock | DELETE FROM `catalogsearch_fulltext` WHERE (store_id=1) AND (product_ id IN ('26515')) | 0.000 |
| 109966 | catalog | mymagentositexxxxxx.com:56606 | catalog | Query | 984 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33218 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 109993 | catalog | mymagentositexxxxxx.com:56645 | catalog | Query | 934 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 109997 | catalog | mymagentositexxxxxx.com:56650 | catalog | Query | 987 | Sending data | INSERT INTO `catalogsearch_result` SELECT 33215 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110040 | catalog | mymagentositexxxxxx.com:56709 | catalog | Query | 983 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33215 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110218 | catalog | mymagentositexxxxxx.com:56925 | catalog | Query | 940 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 6656 AS `query_id`, `s`.`pr oduct_id`, 0 AS `relevance` FRO | 0.000 |
| 110248 | catalog | mymagentositexxxxxx.com:56956 | catalog | Query | 932 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33220 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110380 | catalog | mymagentositexxxxxx.com:57095 | catalog | Query | 906 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33214 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110392 | catalog | mymagentositexxxxxx.com:57107 | catalog | Query | 905 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 33215 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110810 | catalog | mymagentositexxxxxx.com:57554 | catalog | Query | 825 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 6656 AS `query_id`, `s`.`pr oduct_id`, 0 AS `relevance` FRO | 0.000 |
| 110865 | catalog | mymagentositexxxxxx.com:57616 | catalog | Query | 808 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 21581 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 110968 | catalog | mymagentositexxxxxx.com:57782 | catalog | Query | 48 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 110969 | catalog | mymagentositexxxxxx.com:57783 | catalog | Query | 48 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 110989 | catalog | mymagentositexxxxxx.com:57803 | catalog | Query | 39 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 110999 | catalog | mymagentositexxxxxx.com:57813 | catalog | Query | 34 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111012 | catalog | mymagentositexxxxxx.com:57867 | catalog | Query | 32 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111067 | catalog | mymagentositexxxxxx.com:57959 | catalog | Query | 18 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111077 | catalog | mymagentositexxxxxx.com:57974 | catalog | Query | 15 | update | INSERT INTO `sales_flat_quote_item` (`quote_id`, `created_at`, `updat ed_at`, `product_id`, `store_id | 0.000 |
| 111078 | root | localhost | NULL | Query | 0 | init | show processlist | 0.000 |
| 111117 | catalog | mymagentositexxxxxx.com:58015 | catalog | Query | 10 | Waiting for table level lock | INSERT INTO `catalogsearch_result` SELECT 13226 AS `query_id`, `s`.`p roduct_id`, 0 AS `relevance` FR | 0.000 |
| 111147 | moodle | mymagentositexxxxxx.com:58046 | moodle | Sleep | 0 | | NULL | 0.000 |
+--------+-------------+-------------------------------+---------+---------+------+------------------------------+---------------------------------------------------------------------- --------------------------------+----------+
29 rows in set (0.00 sec)
#update2 'Show create table output' 的 table 处于等待状态如下
MariaDB [catalog]> SHOW CREATE TABLE catalogsearch_fulltext; +------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | catalogsearch_fulltext | CREATE TABLE `catalogsearch_fulltext` ( `product_id` int(10) unsigned NOT NULL COMMENT 'Product ID', `store_id` smallint(5) unsigned NOT NULL COMMENT 'Store ID', `data_index` longtext DEFAULT NULL COMMENT 'Data index', `fulltext_id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Entity ID', PRIMARY KEY (`fulltext_id`), UNIQUE KEY `UNQ_CATALOGSEARCH_FULLTEXT_PRODUCT_ID_STORE_ID` (`product_id`,`store_id`), FULLTEXT KEY `FTI_CATALOGSEARCH_FULLTEXT_DATA_INDEX` (`data_index`) ) ENGINE=MyISAM AUTO_INCREMENT=912741 DEFAULT CHARSET=utf8 COMMENT='Catalog search result table' | +------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) MariaDB [catalog]> SHOW CREATE TABLE catalogsearch_result; +----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | catalogsearch_result | CREATE TABLE `catalogsearch_result` ( `query_id` int(10) unsigned NOT NULL COMMENT 'Query ID', `product_id` int(10) unsigned NOT NULL COMMENT 'Product ID', `relevance` decimal(20,4) NOT NULL DEFAULT 0.0000 COMMENT 'Relevance', PRIMARY KEY (`query_id`,`product_id`), KEY `IDX_CATALOGSEARCH_RESULT_QUERY_ID` (`query_id`), KEY `IDX_CATALOGSEARCH_RESULT_PRODUCT_ID` (`product_id`), CONSTRAINT `FK_CATALOGSEARCH_RESULT_QUERY_ID_CATALOGSEARCH_QUERY_QUERY_ID` FOREIGN KEY (`query_id`) REFERENCES `catalogsearch_query` (`query_id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `FK_CATSRCH_RESULT_PRD_ID_CAT_PRD_ENTT_ENTT_ID` FOREIGN KEY (`product_id`) REFERENCES `catalog_product_entity` (`entity_id`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Catalog search result table' | +----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
用时最多的进程 (#109997) 正在接触 MyISAM table？完成 SHOW FULL PROCESSLIST 后，我看到
INSERT
INTO `catalogsearch_result`
SELECT 11474 AS `query_id`, `s`.`product_id`, 0 AS `relevance`
FROM `catalogsearch_fulltext` AS `s`
INNER JOIN `catalog_product_entity` AS `e` ON e.entity_id = s.product_id
WHERE (s.store_id = 1)
AND ((`s`.`data_index` LIKE '%Informaatika%'
OR `s`.`data_index` LIKE '%8.c%')
) ON DUPLICATE KEY
UPDATE `relevance` = VALUES(`relevance`)
那是最近才开始的缓慢 SELECT。由于我们正在谈论 MyISAM，并且正在进行写入，因此查询将一次发生一个（大部分）。
因为 OR 和 LIKE 测试中的 leading 通配符，它很慢。您有什么方法可以避免 both 这些问题吗？有了它们，SELECT 必须扫描整个 table，这显然需要几分钟。 （table有多大？）
更改超时可能会让您超过一个实例，但只会让您处于一个永无止境的查询序列中，等待其他查询完成。
最好的解决方案是远离 MyISAM。更多提示：http://mysql.rjweb.org/doc.php/myisam2innodb
（即使转换后，也可能存在其他问题。）