加速大型数据库的“ SQL_CALC_FOUND_ROWS” SQL查询

如何解决加速大型数据库的“ SQL_CALC_FOUND_ROWS” SQL查询

|| 我正在使用一个名为Feed wordpress的wordpress 插件，以便在wordpress上运行类似网站的星球（在此处查看）。该插件很不错，除了一件事-它大约每周一次将我的（VPS）服务器关闭到提交状态。在与网络管理员的最近电子邮件交流中，他写道：它看起来确实像增加了MysqL 资源使用缓慢造成的由r-bloggers.com运行的查询。这是一些日志的副本正在生产。你会需要优化此网站，并数据库进一步使其运行为尽可能有效。如果这些更改已经完成，您的最好的选择是调查由于高水平或资源和流量网站需要和看到的内容。以下是日志：

# Time: 110614 16:11:35
# User@Host: rblogger_rblogr[rblogger_rblogr] @ localhost []
# Query_time: 104 Lock_time: 0 Rows_sent: 0 Rows_examined: 54616
SELECT sql_CALC_FOUND_ROWS wp_rb_posts.* FROM wp_rb_posts WHERE 1=1 AND ((guid = \'235cbefa4424d0cdb7b6213f15a95ded\') OR (guid = \'http://www.r-bloggers.com/?guid=235cbefa4424d0cdb7b6213f15a95ded\') OR (guid = \'http://www.r-bloggers.com/?guid=235cbefa4424d0cdb7b6213f15a95ded\') OR (MD5(guid) = \'235cbefa4424d0cdb7b6213f15a95ded\')) AND wp_rb_posts.post_type IN (\'post\',\'page\',\'attachment\',\'revision\',\'nav_menu_item\') AND (wp_rb_posts.post_status = \'publish\' OR wp_rb_posts.post_status = \'future\' OR wp_rb_posts.post_status = \'draft\' OR wp_rb_posts.post_status = \'pending\' OR wp_rb_posts.post_status = \'trash\' OR wp_rb_posts.post_status = \'auto-draft\' OR wp_rb_posts.post_status = \'inherit\' OR wp_rb_posts.post_status = \'private\') ORDER BY wp_rb_posts.post_date DESC LIMIT 1570,10;
# User@Host: rblogger_rblogr[rblogger_rblogr] @ localhost []
# Query_time: 237 Lock_time: 0 Rows_sent: 0 Rows_examined: 54616
SELECT sql_CALC_FOUND_ROWS wp_rb_posts.* FROM wp_rb_posts WHERE 1=1 AND ((guid = \'235cbefa4424d0cdb7b6213f15a95ded\') OR (guid = \'http://www.r-bloggers.com/?guid=235cbefa4424d0cdb7b6213f15a95ded\') OR (guid = \'http://www.r-bloggers.com/?guid=235cbefa4424d0cdb7b6213f15a95ded\') OR (MD5(guid) = \'235cbefa4424d0cdb7b6213f15a95ded\')) AND wp_rb_posts.post_type IN (\'post\',\'nav_menu_item\') AND (wp_rb_posts.post_status = \'publish\' OR wp_rb_posts.post_status = \'future\' OR wp_rb_posts.post_status = \'draft\' OR wp_rb_posts.post_status = \'pending\' OR wp_rb_posts.post_status = \'trash\' OR wp_rb_posts.post_status = \'auto-draft\' OR wp_rb_posts.post_status = \'inherit\' OR wp_rb_posts.post_status = \'private\') ORDER BY wp_rb_posts.post_date DESC LIMIT 570,10;
# Time: 110614 16:18:13
# User@Host: rblogger_rblogr[rblogger_rblogr] @ localhost []
# Query_time: 257 Lock_time: 0 Rows_sent: 0 Rows_examined: 54616
SELECT sql_CALC_FOUND_ROWS wp_rb_posts.* FROM wp_rb_posts WHERE 1=1 AND ((guid = \'956e208f101562f6654e88e9711276e4\') OR (guid = \'http://www.r-bloggers.com/?guid=956e208f101562f6654e88e9711276e4\') OR (guid = \'http://www.r-bloggers.com/?guid=956e208f101562f6654e88e9711276e4\') OR (MD5(guid) = \'956e208f101562f6654e88e9711276e4\')) AND wp_rb_posts.post_type IN (\'post\',10;
# Time: 110614 16:19:02
# User@Host: rblogger_rblogr[rblogger_rblogr] @ localhost []
# Query_time: 83 Lock_time: 0 Rows_sent: 0 Rows_examined: 54616
SELECT sql_CALC_FOUND_ROWS wp_rb_posts.* FROM wp_rb_posts WHERE 1=1 AND ((guid = \'6c589e661f03a67b0529fab2f080bfd3\') OR (guid = \'http://www.r-bloggers.com/?guid=6c589e661f03a67b0529fab2f080bfd3\') OR (guid = \'http://www.r-bloggers.com/?guid=6c589e661f03a67b0529fab2f080bfd3\') OR (MD5(guid) = \'6c589e661f03a67b0529fab2f080bfd3\')) AND wp_rb_posts.post_type IN (\'post\',\'nav_menu_item\') AND (wp_rb_posts.post_status = \'publish\' OR wp_rb_posts.post_status = \'future\' OR wp_rb_posts.post_status = \'draft\' OR wp_rb_posts.post_status = \'pending\' OR wp_rb_posts.post_status = \'trash\' OR wp_rb_posts.post_status = \'auto-draft\' OR wp_rb_posts.post_status = \'inherit\' OR wp_rb_posts.post_status = \'private\') ORDER BY wp_rb_posts.post_date DESC LIMIT 1440,10;

这就引出我的问题-该日志中的哪些内容可能向我指示正在发生的事情（为什么这样的查询要花这么长时间？）？有可能优化这些吗？如果是这样，怎么办？谢谢，塔尔

解决方法

熟悉WordPress，我认为您应该在该主题的正在进行中添加一张票证，或者创建一个新票证。 http://core.trac.wordpress.org/ticket/10469 http://core.trac.wordpress.org/ticket/10964 http://core.trac.wordpress.org/search?q=SQL_CALC_FOUND_ROWS 或者，放弃该任务并使用更合适的工具。