Информация о сервере 64 ГБ RAM
Intel (R) Core (TM) i7-3930K CPU @ 3,20 ГГц
Версия сервера Mysql: 5.6.20-log - Сервер сообщества MySQL (GPL)
У меня есть 20 веб-сайтов на этом сервере, например, общий хостинг, на моем большом сайте есть таблица MyIsAM
Помогите мне настроить этот Mysql, пожалуйста
это мой my.cnf по умолчанию
# Example MySQL config file for very large systems.
#
# This is for a large system with memory of 1G-2G where the system runs mainly
# MySQL.
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# 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 = /var/lib/mysql/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
bind-address = 127.0.0.1
local-infile = 0
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-external-locking
key_buffer_size = 384M
max_allowed_packet = 1M
table_open_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size = 32M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 12
# 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
#
# binary logging format - mixed recommended
#binlog_format=mixed
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql
#innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 384M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 100M
#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
[myisamchk]
key_buffer_size = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
Дополнительная информация: я хочу использовать свой 64 ГБ ОЗУ, моя загрузка mysql высокая, веб-сайты загружаются медленно.
Вы должны убедиться, что хотя бы индексы ваших БД помещаются в кеш. Также неплохо сделать join
и sort
достаточно большие буферы, чтобы предотвратить создание временных таблиц на диске.
Моя конфигурация для 32 ГБ ОЗУ выглядит так:
. . . . .
[mysqld]
. . . . .
max_connections = 64
thread_cache_size = 8
thread_concurrency = 8
key_buffer_size = 4G
max_heap_table_size = 128M
join_buffer_size = 32M
sort_buffer_size = 32M
read_buffer_size = 32M
read_rnd_buffer_size = 32M
myisam_sort_buffer_size = 32M
query_cache_limit = 32M
query_cache_size = 64M
table_open_cache = 64
max_allowed_packet = 1M
. . . . .
Имейте в виду, что key_buffer
используется всеми потоками совместно, в то время как join_buffer
и sort_buffer
создаются каждым потоком для частного использования, поэтому максимальный объем используемой оперативной памяти рассчитывается как join|sort_buffer_size
* max_connections
.
Конечно, потребление оперативной памяти зависит от структуры БД и запросов. Вероятно, ваши лучшие ценности будут отличаться от моих.
Есть очень полезный инструмент под названием mysqltuner
это дает много разумных характеристик для настройки:
-------- Performance Metrics -------------------------------------------------
[--] Up for: 6s (9 q [1.500 qps], 6 conn, TX: 14K, RX: 481)
[--] Reads / Writes: 100% / 0%
[--] Total buffers: 4.2G global + 128.3M per thread (64 max threads)
[OK] Maximum possible memory usage: 12.2G (38% of installed RAM)
[OK] Slow queries: 0% (0/9)
[OK] Highest usage of available connections: 1% (1/64)
[OK] Key buffer size / total MyISAM indexes: 4.0G/2.9G
[!!] Query cache efficiency: 0.0% (0 cached / 4 selects)
[OK] Query cache prunes per day: 0
[OK] Temporary tables created on disk: 0% (0 on disk / 2 total)
[OK] Thread cache hit rate: 83% (1 created / 6 connections)
[OK] Table cache hit rate: 100% (26 open / 0 opened)
[OK] Open file limit used: 0% (21/939K)
[OK] Table locks acquired immediately: 100% (36 immediate / 36 locks)
[OK] InnoDB buffer pool / data size: 128.0M/336.0K
[OK] InnoDB log waits: 0
эта статистика выше относится к недавно перезапущенному серверу mysql, поэтому значения частично не имеют значения.