mysql_512.cnf

# Based on Evan Weaver's config and altered slightly to work on Ubuntu 9.04
# as a drop in to /etc/mysql/conf.d/custom.cnf
#
# my.cnf.innodb_512
#
# This is a MySQL 5.x configuration file designed for the typical
# webapp, running on a 512MB server that is also the app and
# httpd server. The below configuration dedicates a bit more
# than half of the system resources to MySQL. It is InnoDB-
# specific, and will not perform well with many MyISAM tables.
# It supports limited ACID and referential integrity. It does not
# support replication.
#
# By Evan Weaver
# http://blog.evanweaver.com/articles/2007/04/30/top-secret-tuned-mysql-configurations-for-rails
#
# Copyright 2007, Cloudburst, LLC
# Licensed under the Academic Free License v. 3.0
# http://blog.evanweaver.com/files/mysql/LICENSE
#

[client]
port     = 3306
socket     = /var/run/mysqld/mysqld.sock
max_allowed_packet = 32M

[mysqld]
######### engine and access interfaces
#skip-networking
skip-locking
#skip-bdb

port     = 3306
socket     = /var/run/mysqld/mysqld.sock
default-storage-engine = innodb

######### character sets
character_set_server = utf8
collation_server = utf8_general_ci

######### innodb options
innodb_additional_mem_pool_size = 16M
# buffer pool size is most critical for innodb's performance and memory usage
innodb_buffer_pool_size = 160M
innodb_data_file_path = ibdata1:10M:autoextend
innodb_data_home_dir = /var/lib/mysql
innodb_file_io_threads = 4
innodb_thread_concurrency = 4
# 2 is fastest but slightly less reliable than 0 or 1, if you don't trust your hard disks
innodb_flush_log_at_trx_commit = 2

innodb_log_buffer_size = 64M
# innodb_log_file_size * innodb_log_files_in_group < buffer_pool_size
innodb_log_file_size = 48M
innodb_log_files_in_group = 3
# use a secondary volume if possible for a concurrent read/write speed boost
innodb_log_group_home_dir = /var/lib/mysql 

innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120

######### myisam
# innodb still requires the myisam engine for mysql's internal metadata table
key_buffer_size = 16M

######### general
connect_timeout = 10
back_log = 50
# you can't have more mongrels or fastcgi processes than the max_connections setting
max_connections = 64
max_connect_errors = 10
table_cache = 2048
max_allowed_packet = 32M

open_files_limit = 1024
# this is the in-memory tmp table max size
max_heap_table_size = 32M
# below are per-connection and per-sub-query
join_buffer_size = 4M
read_buffer_size = 4M
sort_buffer_size = 4M
read_rnd_buffer_size = 4M

thread_cache_size = 8
thread_concurrency = 8

# query_cache_size is a global setting
query_cache_size = 64M
query_cache_limit = 2M
thread_stack = 192K
transaction_isolation = READ-COMMITTED
# this is the on-disk max size
tmp_table_size = 128M
tmpdir = /tmp

# You can log slow queries to the mysql log directory to help isolate performance problems
#log_slow_queries
#long_query_time = 5
#log_long_format

[mysqldump]
quick
max_allowed_packet = 32M

[mysql]
no-auto-rehash

[myisamchk]
# not used except when repairing the database at startup
key_buffer = 64M
sort_buffer_size = 64M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

[mysqld_safe]
open-files-limit = 8192

# PS. Do not under any circumstances enable binlog