线上my.cnf的配置文件，机器是48G内存，12*15K 300GSAS机器，DELL R510。
可以参考，不同的配置设置不一样，所以建议拿去仅作参考。
# MySQL configure file. # MySQL_version 5.5.12 # Version 1.1 # Date 2011-05-15 # The MySQL server [mysqld] port = 4714 user = my4714 datadir = /data1/mysql4714 tmpdir = /dev/shm slave-load-tmpdir = /tmp socket = /tmp/mysql4714.sock key_buffer_size = 64M max_allowed_packet = 16M table_cache = 2048 join_buffer_size = 16M sort_buffer_size = 16M read_buffer_size = 16M read_rnd_buffer_size = 32M myisam_sort_buffer_size = 128M query_cache_size = 256M query_cache_limit = 8M query_cache_type = off max_tmp_tables = 256 tmp_table_size = 128M max_heap_table_size = 128M thread_cache = 64 thread_concurrency = 32 max_connect_errors = 99999999 slow-query-log = 1 slow-query-log-file = slow.log back_log = 600 myisam_repair_threads = 1 myisam-recover = DEFAULT expire_logs_days = 10 interactive_timeout = 28800 wait_timeout = 28800 #old_passwords=1 skip-slave-start skip-name-resolve max_user_connections = 8000 max_connections = 8096 character-set-server = utf8 read_only = 0 log-slave-updates = 1 #------------- innodb -------------- innodb_file_format = Barracuda default-storage-engine = InnoDB innodb_buffer_pool_size = 4G innodb_additional_mem_pool_size = 32M innodb_data_file_path = ibdata1:100M:autoextend innodb_flush_log_at_trx_commit = 0 innodb_log_buffer_size = 8M innodb_log_file_size = 1300M innodb_log_files_in_group = 3 innodb_max_dirty_pages_pct = 90 innodb_lock_wait_timeout = 20 innodb_file_per_table = 1 innodb_flush_method = O_DIRECT innodb_support_xa = 0 innodb_io_capacity = 500 innodb_buffer_pool_instances = 4 replicate_wild_ignore_table = status_%.status_09% replicate_wild_ignore_table = status_%.status_10% replicate_wild_ignore_table = status_%.status_12% server-id = 112014714 log-bin = mysql-bin relay-log = relay-bin log-error = error.log #new cnf by auto rebuild slow_query_log_file = slow.log [client] user = xxxxxx password = xxxxxxx port = 4714 socket = /tmp/mysql4714.sock no-auto-rehash character_set_client = utf8 [myisamchk] key_buffer_size = 64M sort_buffer_size = 32M read_buffer = 16M write_buffer = 16M