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间歇性阻塞 mysql 查询

tag-icon • tag-icon mysql innodb magento
间歇性阻塞 mysql 查询

我们的服务器上有一个大问题，它托管了大约十个 magento 网站。我做了所有明显的优化，比如 Opcode 的 APC、缓存后端的 APC、innodb 设置调整、magento 编译等。

网站加载正常，但有时，一天会有 5-6 次 MySQL 查询“COMMIT”阻塞 MySQL 服务器并花费很长时间执行（> 500 秒）。然后随着所有新传入连接，服务器满载并出现错误“连接过多”。

出现问题时，phpmyadmin的截图如下：http://imagesia.com/process_2l0n

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

有任何想法吗 ？

感谢您的帮助。

答案1

我在强大实用程序 MySQLtuner 的帮助下对 MySQL 进行了许多优化，现在问题已经解决。

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