MySQL CPU Maxing

Question

В настоящее время есть база данных MySQL и проблема с MySQL, работающим на 600% загрузки ЦП.

Технические характеристики:

Процессоры Intel Xeon® E5-2686 v4 (Broadwell) 2,3 ГГц или процессоры Intel Xeon® E5-2676 v3 (Haswell) 2,4 ГГц

8 виртуальных ЦП

32 ГБ ОЗУ

Жесткий диск 100 ГБ.

В настоящее время экземпляр размещается в AWS, на котором запущены Ubuntu 14.04.4 LTS и MySQL версии 5.6.33-0ubuntu0.14.04.1-log.

Пожалуйста, смотрите ниже конфигурацию my.cnf:

# The MySQL database server configuration file.

# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
# 
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port        = 3306
socket      = /var/run/mysqld/mysqld.sock

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket      = /var/run/mysqld/mysqld.sock
nice        = 0
log_error=/var/log/mysql/mysql_error.log

[mysqld]
#
# * Basic Settings
#
user        = mysql
pid-file    = /var/run/mysqld/mysqld.pid
socket      = /var/run/mysqld/mysqld.sock
port        = 3306
basedir     = /usr
datadir     = /var/lib/mysql
tmpdir      = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking

innodb_io_capacity = 2000
innodb_read_io_threads = 64
innodb_thread_concurrency = 0
innodb_write_io_threads = 64
innodb_buffer_pool_size = 2G
innodb_log_file_size = 1G

# Skip reverse DNS lookup of clients
skip-name-resolve

#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address        = 127.0.0.1
#
# * Fine Tuning
#
key_buffer      = 11G
max_allowed_packet  = 16M
thread_stack        = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = BACKUP
#max_connections        = 100
#table_cache            = 64
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit   = 1M
query_cache_size        = 16M
query_cache_type    = 0
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
general_log_file        = /var/log/mysql/mysql.log
general_log             = 1
#
# Error log - should be very few entries.
#
log_error = /var/log/mysql/mysql_error.log
#
# Here you can see queries with especially long duration
#log_slow_queries   = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id      = 1
#log_bin            = /var/log/mysql/mysql-bin.log
expire_logs_days    = 10
max_binlog_size         = 100M
#binlog_do_db       = include_database_name
#binlog_ignore_db   = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem

[mysqldump]
quick
quote-names
max_allowed_packet  = 16M

[mysql]
#no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer      = 512M

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

Answer 1

Во-первых, начните с отключения general_log, нет необходимости постоянно его включать. Общий журнал очень полезен для устранения неполадок и / или целей тестирования, но он является убийцей запросов производительности в производственной базе данных.

Кроме того, если вы используете смешанные движки (MyISAM и InnoDB), вы можете дать innodb_buffer_pool_size больше памяти. Но если вы используете только Innodb, вы можете, например, установить для этой переменной значение 24G, а key_buffer_size - несколько сотен мегабайт.

Если вы используете только MyIsam, пожалуйста, полностью отключите движок Innodb (skip-innodb) и увеличьте параметры, связанные с Myisam memroy, такие как key_buffer_size.

Надеюсь, поможет.