mysql配置参数设置和进程管理

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at % of total RAM for dedicated server, else %.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# ns=
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
#datadir=/var/lib/mysql
datadir=/data/mysql/data
socket=/var/lib/mysql/mysql.sock
#skip-grant-tables                                        //免身份认证，忘记密码的情况下重置密码很管用
default_password_lifetime=

sql_mode = ''

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=

#log-error=/var/log/mysqld.log
#pid-file=/var/run/mysqld/mysqld.pid

log-error=/data/mysql/logs/mysqld.log                    //mysql系统日志,包括启动错误日志
pid-file=/data/mysql/mysqld.pid

#server-id=2                                             //如果开启llog-bin，就需要设置server-id

#master-host=119.28.44.164
#master-user=backup
#master-password=Syhuo.net2018
#master-port=
#master-connect-retry=
#replicate-do-db=zhihuo
#max_allowed_packet = 50M

#log-bin=/data/mysql/logs/log-bin.log
#expire_logs_days =
#增加federated引擎的支持
federated

#开启慢查询日志
#slow-query-log-file="/data/mysql/slowlog/slowlog.log"
#slow_query_log=
#long_query_time=
#log-queries-not-using-indexes
#max_connections=20000                                        //优化参数，mysql sleep进程, too many connections   abort connections   可以通过show processlist查看mysql进程,kill id暴力断开连接，
max_allowed_packet=10M
wait_timeout=
interactive_timeout=28800

[root@izbp18dv3a3metugyd02qxz run]# free 
              total        used        free      shared  buff/cache   available
Mem:       15732560     2032016     4969812       15732     8730732    13348568
Swap:             0           0           0
说明：配置足够高，可以
max_allowed_packet=10M 
wait_timeout=28800 
interactive_timeout=28800
设置，也不会adbort connections ，lost connection ,错误可以log-error=/data/mysql/logs/mysqld.log tail -f 监控到

减少sleep进程措施

1.　程序中，不使用持久链接，即使用mysql_connect而不是pconnect。

2.   程序执行完毕，应该显式调用mysql_close

3.　只能逐步分析系统的SQL查询，找到查询过慢的SQL,优化之