MariaDB 16GB Dedicated Server

mariadb.cnf

# The MariaDB configuration file
# File location /etc/mysql/mariadb.cnf
# Tweak suggested by Abhishek Ghosh, thecustomizewindows.com
# for 16GB dedicated server running Apache2, PHP for WordPress single site
# Test with Major Hayden's MySQL Tuner 
# https://github.com/major/MySQLTuner-perl
#
[mysqld_safe]
nice                            = -15

[client]
host     = localhost
user     = root
password =
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host     = localhost
user     = root
password =
socket   = /var/run/mysqld/mysqld.sock

[mysqld]

# GENERAL #
# user                           = mysql
default-storage-engine         = InnoDB
# socket                         = /var/lib/mysql/mysql.sock
# pid-file                       = /var/lib/mysql/mysql.pid
skip-name-resolve                = 1

# MyISAM #
key-buffer-size                = 103K
myisam-recover                 = FORCE,BACKUP

# SAFETY #
max-allowed-packet             = 32M
max-connect-errors             = 100
sql-mode                       = STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ONLY_FULL_GROUP_BY

# DATA STORAGE #
datadir                        = /var/lib/mysql/

# BINARY LOGGING #
log-bin                        = /var/lib/mysql/mysql-bin
expire-logs-days               = 4
sync-binlog                    = 1

# CACHES AND LIMITS #
tmp-table-size                 = 128M
max-heap-table-size            = 128M
query-cache-type               = 1
query-cache-size               = 32M
query_cache_limit              = 800K
query_cache_min_res_unit       = 2k
max-connections                = 250
thread-cache-size              = 100
open-files-limit               = 6553
table-definition-cache         = 3276
table-open-cache               = 3276
performance_schema=ON

# INNODB #
innodb-flush-method            = O_DIRECT
innodb-log-files-in-group      = 4
innodb-log-file-size           = 128M
innodb-flush-log-at-trx-commit = 1
innodb-file-per-table          = 1
innodb-buffer-pool-size        = 2G
innodb-buffer-pool-instances   = 2
innodb-large-prefix = true
innodb-file-per-table = true

# LOGGING #
log-error                      = /var/lib/mysql/mysql-error.log
# log-queries-not-using-indexes  = 1
# slow-query-log                 = 1
# slow-query-log-file            = /var/lib/mysql/mysql-slow.log

[client-server]

# Import all .cnf files from configuration directory
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mariadb.conf.d/