sample mysql config via the percona configuration wizard
# Generated by Percona Configuration Wizard (http://tools.percona.com/) version REL5-20120208
[mysql]
# CLIENT #
port = 3306
socket = /usr/local/mysql/data/mysql.sock
[mysqld]
# GENERAL #
user = mysql
default_storage_engine = InnoDB
socket = /usr/local/mysql/data/mysql.sock
pid_file = /usr/local/mysql/data/mysql.pid
# MyISAM #
key_buffer_size = 32M
myisam_recover = FORCE,BACKUP
# SAFETY #
max_allowed_packet = 16M
max_connect_errors = 1000000
# DATA STORAGE #
datadir = /usr/local/mysql/data/
# CACHES AND LIMITS #
tmp_table_size = 32M
max_heap_table_size = 32M
query_cache_type = 0
query_cache_size = 0
max_connections = 100
thread_cache_size = 16
open_files_limit = 65535
table_definition_cache = 4096
table_open_cache = 300
# INNODB #
innodb_flush_method = O_DIRECT
innodb_log_files_in_group = 2
innodb_log_file_size = 128M
innodb_flush_log_at_trx_commit = 1
innodb_file_per_table = 1
innodb_buffer_pool_size = 2G
# LOGGING #
log_error = /usr/local/mysql/data/mysql-error.log
log_queries_not_using_indexes = 1
slow_query_log = 1
slow_query_log_file = /usr/local/mysql/data/mysql-slow.log