间歇阻塞mysql查询

Question

我在我们的服务器上有一个很大的问题，它承载了大约十个magento网站。我做了所有明显的优化，比如用于Opcode的APC，用于缓存后端的APC，无意义的设置调优，magento编译等等。

网站加载正确，但有时，每天5-6次，有MySQL查询“提交”，阻止了MySQL服务器，并花费了很长时间来执行(> 500 s)。然后，随着所有新的传入连接，服务器满载一个错误“太多的连接”。

下面是问题出现时Phpmyadmin的屏幕截图：http://imagesia.com/process_210n

我的my.cnf (没有第一个默认部分)

#
# * Fine Tuning
#
key_buffer              = 384M
max_allowed_packet      = 16M
thread_stack            = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = BACKUP
#max_connections        = 100
table_cache            = 2048
#thread_concurrency     = 10
# 
# * Query Cache Configuration
#
query_cache_type        = 1
query_cache_limit       = 1M
query_cache_size        = 64M
# 
# * Logging and Replication
# 
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1

log_error                = /var/log/mysql/error.log

# Here you can see queries with especially long duration
log_slow_queries        = /var/log/mysql/mysql-slow.log
long_query_time = 5
#log-queries-not-using-indexes
# 
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id              = 1
#log_bin                        = /var/log/mysql/mysql-bin.log
expire_logs_days        = 10
max_binlog_size         = 100M

#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
innodb_buffer_pool_size = 1024M
innodb_additional_mem_pool_size = 20M
innodb_log_file_size = 64M
innodb_flush_method=O_DIRECT

#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem


# limite à partir de laquelle les tables temporaires sont créées sur le DD
tmp_table_size=128M
max_heap_table_size=128M

有什么想法吗？

谢谢你的帮助。

Answer 1

在伟大的实用程序MySQL的帮助下，我做了许多MySQLtuner优化，现在问题已经解决了。