Question

最近，有时我无法打开我的网站。

我正在使用VPS进行托管。

当我做mytop时

它告诉我：

       User         Host/IP         DB      Time    Cmd Query or State                                                                                                                             
      --      ----         -------         --      ----    --- ----------                                                                                   
   12512   xxx       localhost xxx        39  Query SELECT * FROM user WHERE no = '12341'                                                                                                      
   12513   xxx       localhost xxx        39  Query SELECT name FROM user WHERE no = '2488'                                                                                                    
   12511   xxx       localhost xxx        40  Query UPDATE `user` SET `exp` = exp+6, `vright` = vright+1, `correct` = correct+1 WHERE `name` = 'Amethys'                                       
   12465   xxx       localhost xxx        48  Query SELECT * FROM user WHERE name = 'pinoysamurai'                                                                                             
   12483   xxx       localhost xxx        48  Query SELECT * FROM user WHERE name = 'pinoysamurai'                                                                                             
   12501   xxx       localhost xxx        52  Query UPDATE `user` SET `exp` = exp+7, `vright` = vright+1, `correct` = correct+1 WHERE `name` = 'yuya_sama'                                     
   12422   xxx       localhost xxx        57  Query SELECT uo.name, ( SELECT COUNT(*) FROM user ui WHERE (ui.kright, ui.no) >= (uo.kright, uo.no) ) AS rank FROM user uo WHERE name = 0

最底层的查询需要100多秒才能完成。在它完成之前，它后面的队列也被卡住了。你可以在mytop输出上看到它。

这是什么问题？我很沮丧......

我正在使用itk mpm 这是我的my.cnf文件:(我有512-1GB的RAM

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
old_passwords=1
interactive_timeout=27
wait_timeout=10
connect_timeout=10
skip-locking
skip-innodb
skip-bdb
max_connections=77
table_cache=2M
thread_cache_size=2M
query_cache_type=1
query_cache_limit=1M
query_cache_size=64M
key_buffer_size=64M
read_rnd_buffer_size=2M
read_buffer_size=2M
sort_buffer_size=2M
join_buffer_size=2M
thread_cache_size=128
thread_concurrency=12
thread_stack =256K
tmp_table_size=32M

谢谢，

Answer 1

也许它有助于在kright, no上添加组合索引，以便加入更快？但我不确定MySQL是否会尊重它。

滞留在队列中的MySQL查询成为瓶颈

1 个答案: