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= 3306socket= /data/mysql/mysql.sock[mysql]prompt="u@ycdb R:m:s [d]> "no-auto-rehash[mysqld]user= mysqlport= 3306basedir= /var/lib/mysqldatadir= /data/mysqlsocket= /data/mysql/mysql.sockpid-file = ycdb.pidcharacter-set-server = utf8mb4skip_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 = 65535back_log = 1024max_connections = 1024max_connect_errors = 1000000table_open_cache = 1024table_definition_cache = 1024table_open_cache_instances = 64thread_stack = 512Kexternal-locking = FALSEmax_allowed_packet = 32Msort_buffer_size = 16Mjoin_buffer_size = 16Mthread_cache_size = 1536interactive_timeout = 600wait_timeout = 600tmp_table_size = 96Mmax_heap_table_size = 96Mslow_query_log = 1log_timestamps = SYSTEMslow_query_log_file = /data/mysql/slow.loglog-error = /data/mysql/error.loglong_query_time = 0.1log_queries_not_using_indexes =1log_throttle_queries_not_using_indexes = 60min_examined_row_limit = 100log_slow_admin_statements = 1log_slow_slave_statements = 1server-id = 3306log-bin = /data/mysql/mybinlogsync_binlog = 1binlog_cache_size = 4Mmax_binlog_cache_size = 2Gmax_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 = 7master_info_repository = TABLErelay_log_info_repository = TABLEgtid_mode = onenforce_gtid_consistency = 1log_slave_updatesslave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'binlog_format = rowbinlog_checksum = 1relay_log_recovery = 1relay-log-purge = 1key_buffer_size = 32Mread_buffer_size = 8Mread_rnd_buffer_size = 16Mbulk_insert_buffer_size = 64Mmyisam_sort_buffer_size = 128Mmyisam_max_sort_file_size = 10Gmyisam_repair_threads = 1lock_wait_timeout = 3600explicit_defaults_for_timestamp = 1innodb_thread_concurrency = 0innodb_sync_spin_loops = 100innodb_spin_wait_delay = 30transaction_isolation = REPEATABLE-READ#innodb_additional_mem_pool_size = 16Minnodb_buffer_pool_size = 5734Minnodb_buffer_pool_instances = 4innodb_buffer_pool_load_at_startup = 1innodb_buffer_pool_dump_at_shutdown = 1innodb_data_file_path = ibdata1:1G:autoextendinnodb_flush_log_at_trx_commit = 1innodb_log_buffer_size = 32Minnodb_log_file_size = 2Ginnodb_log_files_in_group = 2innodb_max_undo_log_size = 4Ginnodb_undo_directory = /data/mysql/undologinnodb_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 - 80000innodb_io_capacity = 4000innodb_io_capacity_max = 8000innodb_flush_sync = 0innodb_flush_neighbors = 0innodb_write_io_threads = 8innodb_read_io_threads = 8innodb_purge_threads = 4innodb_page_cleaners = 4innodb_open_files = 65535innodb_max_dirty_pages_pct = 50innodb_flush_method = O_DIRECTinnodb_lru_scan_depth = 4000innodb_checksum_algorithm = crc32innodb_lock_wait_timeout = 10innodb_rollback_on_timeout = 1innodb_print_all_deadlocks = 1innodb_file_per_table = 1innodb_online_alter_log_max_size = 4Ginnodb_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 5.7innodb_checksums = 1#innodb_file_format = Barracuda#innodb_file_format_max = Barracudaquery_cache_size = 0query_cache_type = 0innodb_undo_logs = 128innodb_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 = 0innodb_status_output_locks = 0#performance_schemaperformance_schema = 1performance_schema_instrument = '%memory%=on'performance_schema_instrument = '%lock%=on'#innodb monitorinnodb_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]quickmax_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~