mysql性能最大化
[client] #passwd = your_passwd port = 3306 socket = /data/mysql/mysql.sock [mysqld] #global settings port = 3306 socket = /data/mysql/mysql.sock basedir=/usr/local/mysql tmpdir=/data/mysql datadir=/data/mysql pid-file=/data/mysql/rongzhong
[client]
#passwd = your_passwd
port = 3306
socket = /data/mysql/mysql.sock
[mysqld]
#global settings
port = 3306
socket = /data/mysql/mysql.sock
basedir=/usr/local/mysql
tmpdir=/data/mysql
datadir=/data/mysql
pid-file=/data/mysql/rongzhong.pid
#跳过外部锁定 只对MyISAM
skip-external-locking
#禁用tcp socket连接,,只能使用unix/linux socket连接
skip_networking
#禁用DNS解析,提高连接速度
skip_name_resolve
#跳过授权表,忘记root密码时使用
#skip-grant-tables
#默认存储引擎
#default-storage-engine=MyISAM/INNODB
#默认字符集
character_set_server=utf8
#最大连接数
max_connections=20480
#最大单用户连接数
max_user_connections=1024
#服务器关闭一个交互连接前等待的秒数,默认28800
interactive_timeout=7200
#线程缓存数,直接利用空闲连接来创建新连接,1G —> 8 2G —> 16 3G —> 32 >3G —> 64
#短连接较多的情况下可以适当增加该值
thread_cache_size=64
#单个线程(连接)进行数据排序(eg: order/group by)时的buffer,连接创建时一次性分配,默认2M,当 Sort_merge_passes较大时可增加该值
sort_buffer_size=2M
#对没有索引的表进行join操作时的buffer,默认256K,连接创建时一次性分配
join_buffer_size=262144
#指定连接侦听队列的大小,该值超过OS的tcp_max_syn_backlog/somaxconn时无效,推荐设置为小于512的整数
back_log=512
#table_open_cache中岁多能打开的表数
table_open_cache = 256
#一次消息传输量的最大值,是net_buffer_length的最大值
max_allowed_packet=8M
#bin-log
#打开二进制日志
log-bin=mysql-bin
log-bin-index=mysql-bin.index
#日志格式,可选row/statement/mixed,默认statement,推荐mixed
binlog_format=mixed
#一个binlog的最大值
max_binlog_size=1G
#对单个连接的binlog缓存大小,默认1M
binlog_cache_size=2M
#binlog cache的总大小
max_binlog_cache_size=2G
#sync_binlog may be 0 or 1
#binlog是否进行磁盘同步,为0时交给OS,为1:事物结束立即同步,IO损耗大
sync_binlog=0
#slow-log
#开启slow log
slow-query-log=1
#指定慢查询的时长
long-query-time=2
#路径
slow-query-log-file=/data/mysql/slowlog/slow.log
#未使用索引的查询也记录到slow log中
log_queries_not_using_indexes=1
#query cache
#启用query cache
query_cache_type=1
#存放单条query cache的最大值,默认1M
query_cache_limit=1M
#存放单条query cache的最小值,默认4K
query_cache_min_res_unit=4096
#query的最大值
query_cache_size=256M
#MyISAM
#索引缓存大小,公式:Key_Size = key_number * (key_length+4)/0.67
key_buffer_size=128M
#单个线程进行顺序读取时的缓存,默认128K
read_buffer_size=2M
#单个线程进行随机读取时的缓存,默认256K
read_rnd_buffer_size = 4M
#重建索引时允许的最大缓存大小,默认8M
myisam_sort_buffer_size = 64M
#指定索引缓存中block大小,默认1K
key_cache_block_size=1024
#禁止索引的单条刷新
delay_key_write=1
#innodb
#启用独立的表空间
#innodb_file_per_table=1
#设置innodb内存缓冲区大小,在纯mysql环境下,推荐设置为服务器内存的60~80%
innodb_buffer_pool_size =8G
#设置OS能进入innodb内核的线程数,推荐2*(CPU核心数+磁盘数)
innodb_thread_concurrency=16
#设置innodb的io行为,可选值fsync/O_DSYNC/O_DIRECT 推荐O_DIRECT提高随机写效率
innodb_flush_method=O_DIRECT
#设置mysql主进程每秒钟向磁盘刷入的脏页数,默认值200
#For systems with individual 5400 RPM or 7200 RPM drives, you might lower the value to the former default of 100
innodb_io_capacity=100
#设置写脏页的线程数
innodb_write_io_threads = 8
#设置从磁盘读文件块的线程数
innodb_read_io_threads = 8
#设置事物日志缓冲区大小
#设置事物日志缓冲区大小
innodb_log_buffer_size=8M
#log thread向磁盘同步日志的方式,可选值为0/1/2
#0: 每秒钟刷新 1:每次事物提交后都刷新 2:交给OS来同步
innodb_flush_log_at_trx_commit =0
#数据库字典信息和表结构空间
innodb_additional_mem_pool_size =16M
#启用Double write Buffer区域,保证数据完整性,但消耗IO
innodb_doublewrite=1
[mysqldump]
# Do not buffer the whole result set in memory before writing it to file. Required for dumping very large tables
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 512M
sort_buffer_size = 512M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
# Increase the amount of open files allowed per process. Warning: Make
# sure you have set the global system limit high enough! The high value
# is required for a large number of opened tables
open-files-limit = 8192