MySql my.ini详解
MySQL服务器实例配置文件模版
版本 1.0.1
安装MySQL为系统服务:mysqld --install MySQL41 --defaults-file="C:/Program Files/MySQL/MySQL Server 4.1/my.ini"
客户端部分[设置端口号]
port=3306
服务器端
port=3306设置端口号
basedir安装目录
datadir数据存放目录
default-character-set使用字符集
default-storage-engine存储引擎
max_connections最大连接数,(活动连接数*3/2+10)或者[MySQL可用内存]/512k
_available_memeory 空闲内存=可用内存-最大连接数*256k.
query_cache_size= 默认0,_available_memeory/10,或者8M
##
_available_memeory -= query_cache_size
_buffers_memeory=_available_memeory*7/10
_thread_buffers_memory=_available_memeory*3/10
_memory_per_thread每个线程内存=_thread_buffers_memory*_over_commit_factor/max_connections
table_cache=所有线程说打开的表默认256,或者max_connections*2
##
_buffers_memeory=_buffer_memeory - table_cache*8k
表暂时空间的大小,如果大于此值,就会写入磁盘中
_big_thread_buffers=<<<{:=[_memory_per_thread]*[_over_commit_factor2]}>>>
_tmp_table_size=<<<{:KM=16M,[_big_thread_buffers]}>>>
tmp_table_size=<<{:Km=[_tmp_table_size],[_memory]*10/100}>>线程缓存
thread_cache=<<{:Rm=[_thread_cache],64}>>
innodb_buffer_pool_size 索引和原始数据缓存默认8M,大些比较好
日志文件大小innodb_log_file_size 默认10M, innodb_buffer_pool_size的25%到100%合适
线程并发度innodb_thread_concurrency=<<{:M=8,2*([CPUS]+[DISKS])}>>(innodb_thread_concurrency=<<{:M=8,2*([CPUS]+1)}>>)
my.ini配置建议：
table_cache=1024
物理内存越大,设置就越大.默认为2402,调到512-1024最佳
innodb_additional_mem_pool_size=4M
默认为2M
innodb_flush_log_at_trx_commit=1
(设置为0就是等到innodb_log_buffer_size列队满后再统一储存,默认为1)
innodb_log_buffer_size=2M
默认为1M
innodb_thread_concurrency=8
你的服务器CPU有几个就设置为几,建议用默认一般为8
key_buffer_size=256M
默认为218 调到128最佳
tmp_table_size=64M
默认为16M 调到64-256最挂
read_buffer_size=4M
默认为64K
read_rnd_buffer_size=16M
默认为256K
sort_buffer_size=32M
默认为256K
max_connections=1024
默认为1210
thread_cache_size=120
默认为60
query_cache_size=32M
————————————————————————————————–
以下是另一个的my.ini配置建议：
port=3306
default-character-set=latin1
default-storage-engine=INNODB
sql-mode=”STRICT_TRANS_TABLES,NO_AUTO_Create_USER,NO_ENGINE_SUBSTITUTION”
max_connections=120
query_cache_size=32M
#缓存数据表数量,设置这个参数可以参见系统状态中的 open_tables(表示当前打开的数据表总数) 和 opened_tables(表示所有打开的数据表总数)
table_cache=256
#临时表的大小
tmp_table_size=12M
#缓存可重用的线程数
thread_cache_size = 64
myisam_max_sort_file_size=100G
myisam_max_extra_sort_file_size=100G
myisam_sort_buffer_size=64M
#这对MyISAM表来说非常重要。如果只是使用MyISAM表，可以把它设置为可用内存的 30-40%。合理的值取决于索引大小、数据量以及负载 — #记住，MyISAM表会使用操作系统的缓存来缓存数据，因此需要留出部分内存给它们，很多情况下数据比索引大多了。
key_buffer_size=128M
read_buffer_size=1M
read_rnd_buffer_size=512K
sort_buffer_size=1M
#这对innodb表来说非常重要
innodb_buffer_pool_size = 256M
#这取决于你需要的回复速度.128M这个数值是适当的恢复时间和良好性能之间的一个好的平衡.
innodb_log_file_size = 128M
#大多数情况4M足够,除非正将很大的blob数据导入到Innodb中可以增加一点.
innodb_log_buffer_size=4M
#这个值取决于你的程序,可能高或者低.8是代表起始值.
innodb_thread_concurrency=8
innodb_additional_mem_pool_size=100M
#如果你不是很关心ACID,可以容许在系统完全crash的情况下丢失最后一两秒的事务,那么可以设置这个值.它可以极大的提高”短”的写事务的效率.
innodb_flush_log_at_trx_commit=2
注意：
很多情况需要具体情况具体分析
1>如果Key_reads太大，则应该把my.cnf中Key_buffer_size变大，保持Key_reads/Key_read_requests至少1/100以上，越小越好。
2>如果Qcache_lowmem_prunes很大，就要增加Query_cache_size的值
==================================================================================
这是MY.INI文件：
# Example MySQL config file for large systems.
#
# This is for a large system with memory = 512M where the system runs mainly
# MySQL.
#
# You can copy this file to
# /etc/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is /usr/local/var) or
# ~/.my.cnf to set user-specific options.
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.
# The following options will be passed to all MySQL clients
[client]
#password = your_password
port = 3306
socket = /tmp/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-locking
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 16M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 8
# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking
# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id = 1
# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
# the syntax is:
#
# CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
# MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
# where you replace <host>, <user>, <password> by quoted strings and
# <port> by the master's port number (3306 by default).
#
# Example:
#
# CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
# MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
# start replication for the first time (even unsuccessfully, for example
# if you mistyped the password in master-password and the slave fails to
# connect), the slave will create a master.info file, and any later
# change in this file to the variables' values below will be ignored and
# overridden by the content of the master.info file, unless you shutdown
# the slave server, delete master.info and restart the slaver server.
# For that reason, you may want to leave the lines below untouched
# (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id = 2
#
# The replication master for this slave - required
#master-host = <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user = <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password = <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port = <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin
# Point the following paths to different dedicated disks
#tmpdir = /tmp/
#log-update = /path-to-dedicated-directory/hostname
# Uncomment the following if you are using BDB tables
#bdb_cache_size = 64M
#bdb_max_lock = 100000
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /usr/local/var/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /usr/local/var/
#innodb_log_arch_dir = /usr/local/var/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 256M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 64M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50
set-variable=max_connections=10000
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
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