很慢的mysql

我的服务器mysql有一个大问题.一切都很好,但从一周开始,它很慢.每个查询都很慢(有时候更多20次).我的配置中没有更改任何内容.

有人可以帮我理解为什么我的服务器现在很慢？

谢谢.

这是我的my.cnf:

[

mysqld_safe]
socket      = /var/run/mysqld/mysqld.sock
nice        = 0

[mysqld]
#
# * Basic Settings
#
user        = mysql
pid-file    = /var/run/mysqld/mysqld.pid
socket      = /var/run/mysqld/mysqld.sock
port        = 3306
basedir     = /usr
datadir     = /var/lib/mysql
tmpdir      = /tmp
language    = /usr/share/mysql/english
#join_buffer_size   = 128.0K
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address        = 127.0.0.1
# * Fine Tuning
#
key_buffer      = 16M
max_allowed_packet  = 16M
max_heap_table_size = 64M
tmp_table_size      = 64M

thread_stack        = 128K
thread_cache_size   = 8
#max_connections        = 100
table_cache            = 400 
join_buffer_size    = 2000K
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit       = 1M
query_cache_size        = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
#log        = /var/log/mysql/mysql.log
#
# Error logging goes to syslog. This is a Debian improvement :)
#
# Here you can see queries with especially long duration
log_slow_queries    = /var/log/mysql/mysql-slow.log
long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
#server-id      = 1
log_bin         = /var/log/mysql/mysql-bin.log
# WARNING: Using expire_logs_days without bin_log crashes the server! See README.Debian!
expire_logs_days    = 10
max_binlog_size         = 100M
#binlog_do_db       = include_database_name
#binlog_ignore_db   = include_database_name
#
# * BerkeleyDB
#
# Using BerkeleyDB is now discouraged as its support will cease in 5.1.12.
skip-bdb
#
# * 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!
# You might want to disable InnoDB to shrink the mysqld process by circa 100MB.
#skip-innodb
innodb_buffer_pool_size = 42M
#
# * 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



[mysqldump]
quick
quote-names
max_allowed_packet  = 16M

[mysql]
#no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer      = 16M

小智.. 5

假设没有任何改变资源(cpu,内存,磁盘活动) - 要查看的一个区域可能是查询的索引.假设数据不断输入/更新,随着越来越多的数据被输入,查询可能会随着时间的推移而减慢 - 特别是如果没有设置索引.如果没有关于整个设置的进一步信息,这类问题很难回答.

假设没有任何改变资源(cpu,内存,磁盘活动) - 要查看的一个区域可能是查询的索引.假设数据不断输入/更新,随着越来越多的数据被输入,查询可能会随着时间的推移而减慢 - 特别是如果没有设置索引.如果没有关于整个设置的进一步信息,这类问题很难回答.