概述
作为DBA或系统运维人员在安装或配置mysql的过程中，经常遇到mysql的配置文件参数不知如何设置？哪些参数需要设置？参数值设置为多少比较合理。下面分享一个老叶的在线生成mysql的生成器。
下载链接：https://imysql.com/my-cnf-wizard.html
功能界面
生成文件
## my.cnf for MySQL 5.7/8.0 # [client] port = 3306 socket = /data/mysql/mysql.sock [mysql] prompt="\u@ycdb \R:\m:\s [\d]> " no-auto-rehash [mysqld] user = mysql port = 3306 basedir = /var/lib/mysql datadir = /data/mysql socket = /data/mysql/mysql.sock pid-file = ycdb.pid character-set-server = utf8mb4 skip_name_resolve = 1 #若你的MySQL数据库主要运行在境外，请务必根据实际情况调整本参数 default_time_zone = "+8:00" open_files_limit = 65535 back_log = 1024 max_connections = 1024 max_connect_errors = 1000000 table_open_cache = 1024 table_definition_cache = 1024 table_open_cache_instances = 64 thread_stack = 512K external-locking = FALSE max_allowed_packet = 32M sort_buffer_size = 16M join_buffer_size = 16M thread_cache_size = 1536 interactive_timeout = 600 wait_timeout = 600 tmp_table_size = 96M max_heap_table_size = 96M slow_query_log = 1 log_timestamps = SYSTEM slow_query_log_file = /data/mysql/slow.log log-error = /data/mysql/error.log long_query_time = 0.1 log_queries_not_using_indexes =1 log_throttle_queries_not_using_indexes = 60 min_examined_row_limit = 100 log_slow_admin_statements = 1 log_slow_slave_statements = 1 server-id = 3306 log-bin = /data/mysql/mybinlog sync_binlog = 1 binlog_cache_size = 4M max_binlog_cache_size = 2G max_binlog_size = 1G #注意：MySQL 8.0开始，binlog_expire_logs_seconds选项也存在的话，会忽略expire_logs_days选项 expire_logs_days = 7 master_info_repository = TABLE relay_log_info_repository = TABLE gtid_mode = on enforce_gtid_consistency = 1 log_slave_updates slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN' binlog_format = row binlog_checksum = 1 relay_log_recovery = 1 relay-log-purge = 1 key_buffer_size = 32M read_buffer_size = 8M read_rnd_buffer_size = 16M bulk_insert_buffer_size = 64M myisam_sort_buffer_size = 128M myisam_max_sort_file_size = 10G myisam_repair_threads = 1 lock_wait_timeout = 3600 explicit_defaults_for_timestamp = 1 innodb_thread_concurrency = 0 innodb_sync_spin_loops = 100 innodb_spin_wait_delay = 30 transaction_isolation = REPEATABLE-READ #innodb_additional_mem_pool_size = 16M innodb_buffer_pool_size = 5734M innodb_buffer_pool_instances = 4 innodb_buffer_pool_load_at_startup = 1 innodb_buffer_pool_dump_at_shutdown = 1 innodb_data_file_path = ibdata1:1G:autoextend innodb_flush_log_at_trx_commit = 1 innodb_log_buffer_size = 32M innodb_log_file_size = 2G innodb_log_files_in_group = 2 innodb_max_undo_log_size = 4G innodb_undo_directory = /data/mysql/undolog innodb_undo_tablespaces = 95 # 根据您的服务器IOPS能力适当调整 # 一般配普通SSD盘的话，可以调整到 10000 - 20000 # 配置高端PCIe SSD卡的话，则可以调整的更高，比如 50000 - 80000 innodb_io_capacity = 4000 innodb_io_capacity_max = 8000 innodb_flush_sync = 0 innodb_flush_neighbors = 0 innodb_write_io_threads = 8 innodb_read_io_threads = 8 innodb_purge_threads = 4 innodb_page_cleaners = 4 innodb_open_files = 65535 innodb_max_dirty_pages_pct = 50 innodb_flush_method = O_DIRECT innodb_lru_scan_depth = 4000 innodb_checksum_algorithm = crc32 innodb_lock_wait_timeout = 10 innodb_rollback_on_timeout = 1 innodb_print_all_deadlocks = 1 innodb_file_per_table = 1 innodb_online_alter_log_max_size = 4G innodb_stats_on_metadata = 0 #注意：MySQL 8.0.16开始删除该选项 internal_tmp_disk_storage_engine = InnoDB # some var for MySQL 5.7 innodb_checksums = 1 #innodb_file_format = Barracuda #innodb_file_format_max = Barracuda query_cache_size = 0 query_cache_type = 0 innodb_undo_logs = 128 innodb_status_file = 1 #注意: 开启 innodb_status_output & innodb_status_output_locks 后, 可能会导致log-error文件增长较快 innodb_status_output = 0 innodb_status_output_locks = 0 #performance_schema performance_schema = 1 performance_schema_instrument = '%memory%=on' performance_schema_instrument = '%lock%=on' #innodb monitor innodb_monitor_enable="module_innodb" innodb_monitor_enable="module_server" innodb_monitor_enable="module_dml" innodb_monitor_enable="module_ddl" innodb_monitor_enable="module_trx" innodb_monitor_enable="module_os" innodb_monitor_enable="module_purge" innodb_monitor_enable="module_log" innodb_monitor_enable="module_lock" innodb_monitor_enable="module_buffer" innodb_monitor_enable="module_index" innodb_monitor_enable="module_ibuf_system" innodb_monitor_enable="module_buffer_page" innodb_monitor_enable="module_adaptive_hash" [mysqldump] quick max_allowed_packet = 32M
这份配置文件，有以下几个地方需要关注下：
?已默认关闭了query cache，如果觉得有需要，自行打开；
?客户端连接超时我设置600秒，如果觉得太长或太短，自行调整；
?默认打开innodb status输出到log中，以及innodb lock输出到log中，如果觉得烦人，可自行关闭；
?把binlog-format默认改为row格式，如果不符合预期，请自行调整；
?把table lock的默认timeout时长（lock_wait_timeout）设置为3600秒，这个值之前的默认值是1天，我觉得太长了；
?几乎启用了全部Performance Schema功能，方便后续定位性能问题；
?启用了InnoDB Metric的大多数检测模块，方便对InnoDB进行监控；
觉得有用的朋友多帮忙转发哦！后面会分享更多devops和DBA方面的内容，感兴趣的朋友可以关注下~
