三、配置文件优化（根据实际情况优化）
说明，上文中我对my-innodb-heavy-4G.cnf中默认的所有选项进行了说明，下面我就根据我们公司的实际情况进行优化！
1.服务器的运行环境
硬件服务器：Dell R710，双至强E5620 CPU、16G内存、6*500G硬盘
操作系统：CentOS5.5 X86_64 系统
Mysql版本：MySQL 5.5.32
适用于：日IP 100-200W ，日PV 200-500W 的站点
2.具体优化配置如下
| [client] port = 3306 socket = /tmp/mysql.sock default-character-set = utf8 #设置客户端的字符编码 [mysqld] # generic configuration options port = 3306 socket = /tmp/mysql.sock #*** char set *** character-set-server = utf8 #设置服务器端的字符编码 #*** network *** back_log = 512 #skip-networking #默认没有开启 max_connections = 3000 max_connect_errors = 30 table_open_cache = 4096 #external-locking #默认没有开启 max_allowed_packet = 32M max_heap_table_size = 128M # *** global cache *** read_buffer_size = 8M read_rnd_buffer_size = 64M sort_buffer_size = 16M join_buffer_size = 16M # *** thread *** thread_cache_size = 16 thread_concurrency = 8 thread_stack = 512K # *** query cache *** query_cache_size = 128M query_cache_limit = 4M # *** index *** ft_min_word_len = 8 #memlock #默认没有开启 default-storage-engine = INNODB transaction_isolation = REPEATABLE-READ # *** tmp table *** tmp_table_size = 64M # *** bin log *** log-bin=mysql-bin binlog_cache_size = 4M binlog_format=mixed #log_slave_updates #默认没有开启 #log #默认没有开启，此处是查询日志，开启会影响服务器性能 log_warnings #开启警告日志 # *** slow query log *** slow_query_log long_query_time = 10 # *** Replication related settings server-id = 1 #server-id = 2 #master-host = <hostname> #master-user = <username> #master-password = <password> #master-port = <port> #read_only #*** MyISAM Specific options key_buffer_size = 128M bulk_insert_buffer_size = 256M myisam_sort_buffer_size = 256M myisam_max_sort_file_size = 10G myisam_repair_threads = 1 myisam_recover # *** INNODB Specific options *** #skip-innodb #默认没有开启 innodb_additional_mem_pool_size = 64M innodb_buffer_pool_size = 6G #注意在32位系统上你每个进程可能被限制在 2-3.5G 用户层面内存限制, 所以不要设置的太高. innodb_data_file_path = ibdata1:10M:autoextend #innodb_data_home_dir = <directory> innodb_write_io_threads = 8 innodb_read_io_threads = 8 #innodb_force_recovery=1 innodb_thread_concurrency = 16 innodb_flush_log_at_trx_commit = 2 #说明：innodb_flush_log_at_trx_commit = 2 如果是游戏服务器，建议此值设置为2；如果是对数据安全要求极高的应用，建议设置为1；设置为0性能最高，但如果发生故障，数据可能会有丢失的危险！默认值1的意思是每一次事务提交或事务外的指令都需要把日志写入（flush）硬盘，这是很费时的。特别是使用电池供电缓存（Battery backed up cache）时。设成2对于很多运用，特别是从MyISAM表转过来的是可以的，它的意思是不写入硬盘而是写入系统缓存。日志仍然会每秒flush到硬盘，所以你一般不会丢失超过1-2秒的更新。设成0会更快一点，但安全方面比较差，即使MySQL挂了也可能会丢失事务的数据。而值2只会在整个操作系统挂了时才可能丢数据。 #innodb_fast_shutdown innodb_log_buffer_size = 16M innodb_log_file_size = 512M innodb_log_files_in_group = 3 #innodb_log_group_home_dir innodb_max_dirty_pages_pct = 90 #innodb_flush_method=O_DSYNC innodb_lock_wait_timeout = 120 [mysqldump] quick max_allowed_packet = 32M [mysql] no-auto-rehash [myisamchk] key_buffer_size = 2048M sort_buffer_size = 2048M read_buffer = 32M write_buffer = 32M [mysqlhotcopy] interactive-timeout [mysqld_safe] open-files-limit = 10240 |
