здравствуйте.поставил mysql из репозитория remi,версия mysql 5.5.11-1.el5.remi,ОС центос 5.6 ,при старте mysql запускается сразу 15 процессов mysqld,подскажите пожалуйста как так получилось
110429 02:47:08 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
110429 2:47:08 [Note] Plugin 'FEDERATED' is disabled.
110429 2:47:08 InnoDB: The InnoDB memory heap is disabled
110429 2:47:08 InnoDB: Mutexes and rw_locks use InnoDB's own implementation
110429 2:47:08 InnoDB: Compressed tables use zlib 1.2.3
110429 2:47:08 InnoDB: Using Linux native AIO
110429 2:47:08 InnoDB: Initializing buffer pool, size = 128.0M
110429 2:47:08 InnoDB: Completed initialization of buffer pool
110429 2:47:08 InnoDB: highest supported file format is Barracuda.
110429 2:47:08 InnoDB: Waiting for the background threads to start
110429 2:47:09 InnoDB: 1.1.6 started; log sequence number 1595675
110429 2:47:09 [Note] Event Scheduler: Loaded 0 events
110429 2:47:09 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.5.11' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL) by Remi
110429 2:49:00 [Note] /usr/libexec/mysqld: Normal shutdown
110429 03:01:21 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
my.cnf
text
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Semisynchronous Replication
# http://dev.mysql.com/doc/refman/5.5/en/replication-semisync.html
# uncomment next line on MASTER
;plugin-load=rpl_semi_sync_master=semisync_master.so
# uncomment next line on SLAVE
;plugin-load=rpl_semi_sync_slave=semisync_slave.so
# Others options for Semisynchronous Replication
;rpl_semi_sync_master_enabled=1
;rpl_semi_sync_master_timeout=10
;rpl_semi_sync_slave_enabled=1
а что делать если у меня vps и всего 512 мб памяти и того на мускул только 376мб
менять my.cnf
Патрик рекомендует следующие параметры:
Показать
# Example MySQL config file for large systems.
#
# This is for a large system with memory = 512M 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/run/mysql/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
port = 3306
socket = /var/run/mysql/mysql.sock
skip-locking
key_buffer_size = 256M
max_allowed_packet = 1M
table_open_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
# binary logging format - mixed recommended
binlog_format=mixed
# 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
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql
#innodb_data_file_path = ibdata1:10M: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 = 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
кроме того, в /usr/share/mesql лежат примеры конфигов мускула под различные мощности сервера... посмотрите там и выберите нужный
в зависимости от предполагаемой нагрзуки вашего сервера может подойти либо my-small.cnf, либо my-medium.cnf
выберите нужный, скопируйте куда-нибудь, переименуйте в my.cnf и положите в надлежащее для него место... только существующий переименуйте во что-нибудь или сделайте бэкап
ну раз у нас тут "крос-дистрибутивные", то в слаке админ выбирает один из
[console]$ ls /etc/my-*
/etc/my-huge.cnf /etc/my-large.cnf /etc/my-medium.cnf /etc/my-small.cnf
[/console]
этих конфигов. В Debian'е там такое симпотное меню. А в CentOS как-то по RH'атовски :)
