My.cnf sobre tuning de Mysql!
Configuração do arquivo my.cnf (arquivo principal de configuração do Mysql) recomendado para um servidor realmente grande (4 CPUs, 64 bit, 8 Gb de RAM somente para Mysql) em termos de performance e utilização:
#password = [your_password]
port = 3306
socket = /var/lib/mysql/mysql.sock[mysqld]
#DESCR: 8GB RAM, InnoDB only, ACID, few connections, heavy queries
datadir = /var/lib/mysql
socket = /var/lib/mysql/mysql.sock
user = mysql
skip-locking
port = 3306
back_log = 50
#log
#log_bin
max_connections = 2048
max_connect_errors = 512
table_cache = 1024
max_allowed_packet = 16M
binlog_cache_size = 1M
max_heap_table_size = 64M
sort_buffer_size = 8M
max_sort_length = 256M
join_buffer_size = 8M
thread_cache_size = 128
thread_concurrency = 20
max_delayed_threads = 40
query_cache_type = 1
query_cache_size = 256M
query_cache_limit = 8M
ft_min_word_len = 4
default_table_type = InnoDB
thread_stack = 192K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 64M
log_slow_queries
long_query_time = 2
log_long_format
tmpdir = /tmp# Timeouts options
connect_timeout = 360
interactive_timeout = 720
wait_timeout = 720
net_read_timeout = 360
net_retry_count = 10
net_write_timeout = 360
slave_net_timeout = 720#*** MyISAM Specific options
key_buffer_size = 32M
read_buffer_size = 2M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_max_extra_sort_file_size = 10G
myisam_repair_threads = 1
myisam_recover
skip-bdb
#skip-innodb
innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 2G
innodb_data_file_path = ibdata1:10M:autoextend
innodb_data_home_dir = /var/lib/mysql
innodb_file_io_threads = 4
#innodb_force_recovery=1
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 1
#innodb_log_archive = ON
innodb_log_arch_dir = /var/lib/mysql
#innodb_fast_shutdown
innodb_log_buffer_size = 8M
innodb_log_file_size = 256M
innodb_log_files_in_group = 3
innodb_log_group_home_dir = /var/lib/mysql
innodb_max_dirty_pages_pct = 90
innodb_flush_method = O_DIRECT
innodb_lock_wait_timeout = 120
innodb_doublewrite = 0
[mysqldump]
quick
max_allowed_packet = 16M[mysql]
no-auto-rehash
# Only allow UPDATEs and DELETEs that use keys.
#safe-updates[isamchk]
key_buffer = 512M
sort_buffer_size = 512M
read_buffer = 8M
write_buffer = 8M[myisamchk]
key_buffer = 512M
sort_buffer_size = 512M
read_buffer = 8M
write_buffer = 8M[mysqlhotcopy]
interactive-timeout[mysqld_safe]
open-files-limit = 8192
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
A maioria dos items são bastante auto-explicativos, acho que agora você tem material suficiente para começar seu próprio Mysql-tuning!
Fonte: http://www.hitk.com.br
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