phpmyadmin运行速度很慢（information_schema）

Question

我有2个服务器（共享主机）的以下场景：

Linux服务器＃1 - MySQL 5.5 - 8000数据库

Linux Server＃2 - MySQL 5.6 - 7000数据库

通过放置phpMyAdmin 4.xx，两台服务器上的第一次访问速度非常慢（渲染页面的时间超过16秒）。启用调试，无法识别它执行information_schema的查询，如下所示：

[1f94c8d385c8b4d595d10b6542624c40] => Array (
    [count] => 1
    [query] => SELECT `SCHEMA_NAME` FROM `INFORMATION_SCHEMA`.`SCHEMATA`, (select DB_first_level from ( SELECT distinct SUBSTRING_INDEX(SCHEMA_NAME, '_', 1) DB_first_level FROM INFORMATION_SCHEMA.SCHEMATA WHERE TRUE AND `SCHEMA_NAME` NOT REGEXP 'information_schema' ) t ORDER BY DB_first_level ASC LIMIT 0, 250) t2 where 1 = locate(concat(DB_first_level, '_'), concat(SCHEMA_NAME, '_')) order by SCHEMA_NAME ASC
    [time] => 3.34156107903
    [trace] => Array (
        [0] => Array(
            [0] => ./libraries/DatabaseInterface.class.php#205: PMA_DatabaseInterface->_dbgQuery()
            [1] => ./libraries/DatabaseInterface.class.php#1705: PMA_DatabaseInterface->tryQuery()
            [2] => ./libraries/navigation/Nodes/Node.class.php#383: PMA_DatabaseInterface->fetchResult()
            [3] => ./libraries/navigation/NavigationTree.class.php#211: Node->getData()
            [4] => ./libraries/navigation/NavigationTree.class.php#674: PMA_NavigationTree->_buildPath()
            [5] => ./libraries/navigation/Navigation.class.php#52: PMA_NavigationTree->renderState()
            [6] => ./libraries/Header.class.php#377: PMA_Navigation->getDisplay()
            [7] => ./libraries/Response.class.php#262: PMA_Header->getDisplay()
            [8] => ./libraries/Response.class.php#275: PMA_Response->_getDisplay()
            [9] => ./libraries/Response.class.php#373: PMA_Response->_htmlResponse()
            [10] => ./libraries/OutputBuffering.class.php#114: PMA_Response::response()
            [11] => PMA_OutputBuffering::stop()
        )
    )
)

[5f54e097676bb853308c7efc720c99f8] => Array (
    [count] => 2
    [query] => select COUNT(*) from ( SELECT distinct SUBSTRING_INDEX(SCHEMA_NAME, '_', 1) DB_first_level FROM INFORMATION_SCHEMA.SCHEMATA WHERE TRUE AND `SCHEMA_NAME` NOT REGEXP 'information_schema' ) t 
    [time] => 1.7902340889
    [trace] => Array (
        [0] => Array (
            [0] => ./libraries/DatabaseInterface.class.php#205: PMA_DatabaseInterface->_dbgQuery()
            [1] => ./libraries/DatabaseInterface.class.php#1563: PMA_DatabaseInterface->tryQuery()
            [2] => ./libraries/navigation/Nodes/Node.class.php#406: PMA_DatabaseInterface->fetchValue()
            [3] => ./libraries/navigation/NavigationTree.class.php#1072: Node->getPresence()
            [4] => ./libraries/navigation/NavigationTree.class.php#677: PMA_NavigationTree->_fastFilterHtml()
            [5] => ./libraries/navigation/Navigation.class.php#52: PMA_NavigationTree->renderState()
            [6] => ./libraries/Header.class.php#377: PMA_Navigation->getDisplay()
            [7] => ./libraries/Response.class.php#262: PMA_Header->getDisplay()
            [8] => ./libraries/Response.class.php#275: PMA_Response->_getDisplay()
            [9] => ./libraries/Response.class.php#373: PMA_Response->_htmlResponse()
            [10] => ./libraries/OutputBuffering.class.php#114: PMA_Response::response()
            [11] => PMA_OutputBuffering::stop()
        )

        [1] => Array (
            [0] => ./libraries/DatabaseInterface.class.php#205: PMA_DatabaseInterface->_dbgQuery()
            [1] => ./libraries/DatabaseInterface.class.php#1563: PMA_DatabaseInterface->tryQuery()
            [2] => ./libraries/navigation/Nodes/Node.class.php#406: PMA_DatabaseInterface->fetchValue()
            [3] => ./libraries/navigation/NavigationTree.class.php#1148: Node->getPresence()
            [4] => ./libraries/navigation/NavigationTree.class.php#678: PMA_NavigationTree->_getPageSelector()
            [5] => ./libraries/navigation/Navigation.class.php#52: PMA_NavigationTree->renderState()
            [6] => ./libraries/Header.class.php#377: PMA_Navigation->getDisplay()
            [7] => ./libraries/Response.class.php#262: PMA_Header->getDisplay()
            [8] => ./libraries/Response.class.php#275: PMA_Response->_getDisplay()
            [9] => ./libraries/Response.class.php#373: PMA_Response->_htmlResponse()
            [10] => ./libraries/OutputBuffering.class.php#114: PMA_Response::response()
            [11] => PMA_OutputBuffering::stop()
        )
    )
)

有人有任何建议吗？

编辑：我忘了说，innodb_stats_on_metadata已经关闭。

Answer 1

尝试将innodb_stats_on_metadata设为0