MySQL配置文件

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当前使用的MySQL配置文件如下,未来还需要进行调整优化,如果有任何意见建议请留言。

文件:/etc/my.cnf

代码:

# 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
#back_log = 50
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 128
tmp_table_size = 64M
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 2M
myisam_sort_buffer_size = 32M
thread_cache_size = 8
query_cache_size= 16M
max_connections = 800
wait_timeout= 120
skip-name-resolve
#uery_cach2_type= 1
#skip-innodb
skip-bdb
# 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

[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]
interactive-timeout

关于“MySQL配置文件”的留言:

2007年8月28日调整说明

# 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
back_log = 64
#binlog_cache_size = 256k
key_buffer = 256M
max_allowed_packet = 1M-->4M
max_tmp_tables = 128
table_cache = 192--->512 从整个情况来看tw.18dao.net,wiki.18dao.com,cn.18dao.net,wiki.027.cn都属于流量相对较大的站点,中间有很多表使用了InnoDB引擎,从vmstat bi,bo比较频繁但,wa,si,so等都正常,因而现在不是最大的瓶颈,但Table_locks_waited数值有点不正常。
tmp_table_size = 256M
sort_buffer_size = 64M-->16M 从Sorting可以发现排序命中在50%以上,而现在top查看的内存占用相对过高。
read_buffer_size = 2M
read_rnd_buffer_size = 2M-->4M 因为程序排序以后使用内存情况因slow_log内的相关联接查询而定。
myisam_sort_buffer_size = 128M--> 64M 从Sorting可以发现排序命中在50%以上,而现在top查看的内存占用相对过高。
#新添加变量
# This buffer is used for the optimization of full JOINs (JOINs without
# indexes). Such JOINs are very bad for performance in most cases
# anyway, but setting this variable to a large value reduces the
# performance impact. See the "Select_full_join" status variable for a
# count of full JOINs. Allocated per thread if full join is found
join_buffer_size = 4M  由sort_buffer_size,read_buffer_size,read_rnd_buffer_size参考得到的默认为128K,灵位在整个slow_log里面所有执行耗用大的均为联接查询,看了一下联接的2张表有些在50M-100M的数量级上。
#结束
thread_cache_size = 16-->32 从Threads来看cache的Threads都在10左右,稍微高峰点就超过了上限(20:52并不是高峰时候),虽然slow的Threads没有。
query_cache_size= 768M-->640M 减低该值主要因为现在的富余保持在110M左右富余较多。
query_prealloc_size = 128k-->64K 无需解释设置错误,这样设置的结果Query cache数据将给人错误的参数指导
query_alloc_block_size = 64k-->128K 无需解释设置错误,这样设置的结果Query cache数据将给人错误的参数指导
query_cache_min_res_unit = 1k
max_connections = 1024-->512 从max. concurrent connections 104 说明此之不会太大,我看到过的最大的时候为192,但为了保留一定的突发性的并发  
wait_timeout= 60
low_priority_updates=1
#long_query_time = 10--->5 已经分析过10的数据,应该再看看更低耗用的情况中那些操作相对耗用资源多一些。(记得去掉#号)
skip-name-resolve
#locked_in_memory
#uery_cach2_type= 1
#skip-innodb
skip-bdb
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 2

log_slow_queries

# 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 = ibdata1:2G;ibdata2:2G;ibdata3:2G;ibdata4:2G;ibdata5:2G;ibdata6:2G;ibdata7:2G;ibdata8:2G:autoextend
#innodb_log_group_home_dir = /usr/local/var/
innodb_log_files_in_group = 4
#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 = 1G-->512M 当时因为单个ibdata文件I/O瓶颈严重,而现在top查看的内存占用相对过高上面说的50%是说的一个计算值,具体参考一下相关资料。另看看tw.18dao.org有张表有2G多而且是Innodb引擎,这个可能会成为以后最头痛的I/O瓶颈。
#innodb_additional_mem_pool_size = 20M--->开启 因为pool_size减少了。
# Set .._log_file_size to 25 % of buffer pool size

innodb_log_file_size = 128M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 0
innodb_lock_wait_timeout = 30
#innodb-file-per-table=ON

[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 = 16M
write_buffer = 16M

[mysqlhotcopy]
--interactive-timeout

2007年8月29日调整说明

table_cache->256 过大,理由Table_locks_waited/Table_locks_immediate值并不大,但出现了Slow_launch_threads而之前是没有的说明反应不够及时。
Query cache 部分来看cache现在的性能非常好
query_cache_size= 640M 
query_prealloc_size = 64k 
query_alloc_block_size = 128k
query_cache_min_res_unit = 1k 
这部分千万不要动什么,唯一不足的是Qcache_free_memory 204 M 富余较多,因此query_cache_size可以根据按照富余的一半左右减少,若再持续时间累计到1天半还是这样的情况,即可以减少128M,否则根均相应的情况酌情减少。

添加:
join_buffer_size=4M
理由Sorting 部分连接查询相关的数据显示耗用很大。在此重申此参数,必须进行调整。


thread_cache_size=32还是明显的不足,这个上次已经说明过理由。

以后需要一起做的参数调整工作

有个值似乎没调小:) 
sort_size
sort_buffer_size = 16M 
这个
下次调整尝试2改sort那个还尝试把2个参数注释掉让其使用默认的
query_prealloc_size = 64k query_alloc_block_size = 128k
前面加#即可 
thread_cache_size这个还应加到32

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