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MySQL plötzlich sehr langsam, CPU ausgelastet
Posted by: Martin Weil
Date: March 06, 2019 07:34AM

Hallo,

auf meinem Ubuntu 16.04 läuft Plesk Onyx mit MySQL 5.7.25 sowie Typo3 6.2 und Wordpress 5.1 Installationen sowie NGINX. Es handelt sich um einen dedicated Server mit Raid 1 HDD, 8 GB Ram und 4 Cores.

Seit kurzem habe ich arge Performance Probleme. Immer wieder reagieren die Webseiten und auch Plesk extrem langsam (dauert teils bis zu 20 Sekunden bis es wieder läuft).

Per "htop" konnte ich feststellen dass auf 2 Kernen der MySQL Prozess dann 100% CPU hat. Und auch die Festplatte ist "100% busy".

Leider konnte ich bisher keinen Grund dafür finden (der Server hat sehr wenig Besucher und ist sicherlich NICHT dadurch ausgelastet).

Ich poste hier mal meine "mysqld.cnf" und hoffe dass ihr mir sagen könnt ob da grobe Schnitzer drin sind oder welche Werte ich ändern / einfügen sollte.

[mysqld_safe]
socket		= /var/run/mysqld/mysqld.sock
nice		= 0

[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
#
# 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_size		= 16M
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-options  = BACKUP
#max_connections        = 100
#table_cache            = 64
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit	= 1M
query_cache_size        = 16M
#
# * 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/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

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MySQL plötzlich sehr langsam, CPU ausgelastet
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