下面是一个适合生产的 MySQL 参数文件示例，可供参考。
[client]
user=hr
password=hr
[mysqld]
########basic settings########
server-id = 11
port = 3306
user = mysql
bind_address = xx.xx.xx.xx
autocommit = 0
# 该参数 5.5.x 后才有，如果安装 5.6，注释掉该行，安装完成后再打开，5.7无需注释，直接安装
character_set_server=utf8mb4
skip_name_resolve = 1
max_connections = 800
max_connect_errors = 1000
datadir = /data/mysql_data
transaction_isolation = READ-COMMITTED
explicit_defaults_for_timestamp = 1
join_buffer_size = 134217728
tmp_table_size = 67108864
tmpdir = /tmp
max_allowed_packet = 16777216
sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
interactive_timeout = 1800
wait_timeout = 1800
read_buffer_size = 16777216
read_rnd_buffer_size = 33554432
sort_buffer_size = 33554432
########log settings########
log_error = error.log
# 这儿定义error日志为datadir目录下的error.log文件，而不是生成一个 主机名.err 文件
pid_file = 3306.pid
# 这儿定义error日志为datadir目录下的3306.pid文件，而不是生成一个 主机名.pid 文件
slow_query_log = 1
slow_query_log_file = slow.log
log_queries_not_using_indexes = 1
log_slow_admin_statements = 1
log_slow_slave_statements = 1
log_throttle_queries_not_using_indexes = 10
expire_logs_days = 90
long_query_time = 2
min_examined_row_limit = 100
log_timestamps = SYSTEM
########replication settings########
master_info_repository = TABLE
relay_log_info_repository = TABLE
log_bin = bin.log
sync_binlog = 1
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
binlog_format = row
relay_log = relay.log
relay_log_recovery = 1
binlog_gtid_simple_recovery = 1
slave_skip_errors = ddl_exist_errors
########innodb settings########
innodb_page_size = 8192
innodb_buffer_pool_size = 6G
# 这儿服务器的内存是8G。可以设置为服务器的 75% ~ 90 %。
innodb_buffer_pool_instances = 8
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_lru_scan_depth = 500
innodb_lock_wait_timeout = 5
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_method = O_DIRECT
innodb_file_format = Barracuda
innodb_file_format_max = Barracuda
innodb_log_group_home_dir = /redolog/
innodb_undo_directory = /undolog/
# 这儿的路径表示操作系统的路径，建议放在单独的存储上，默认值是 ./ ，表示 DATA 目录，这两个目录需要手动创建并注意权限
innodb_undo_logs = 128
# 要规划好，后期修改很麻烦
innodb_undo_tablespaces = 3
# innodb_undo_tablespaces 不支持后期修改
# 要规划好，后期修改很麻烦
innodb_flush_neighbors = 0
innodb_log_file_size = 4G
# 很多人的redo size 是默认的48M，线上环境推荐4G，5.5及之前的版本之所以默认值很小，是因为太大有bug，现已经修复
innodb_log_buffer_size = 16777216
innodb_purge_threads = 4
innodb_large_prefix = 1
innodb_thread_concurrency = 64
innodb_print_all_deadlocks = 1
innodb_strict_mode = 1
innodb_sort_buffer_size = 67108864
########semi sync replication settings########
## 注意这个路径，根据实际情况修改
plugin_dir=/usr/local/mysql/lib/plugin
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
loose_rpl_semi_sync_master_enabled = 1
loose_rpl_semi_sync_slave_enabled = 1
loose_rpl_semi_sync_master_timeout = 5000
[mysqld-5.7]
# 这种 tag 表示下面的配置在什么版本下才生效, [mysqld] 均生效
innodb_buffer_pool_dump_pct = 40
innodb_page_cleaners = 4
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 2G
innodb_purge_rseg_truncate_frequency = 128
binlog_gtid_simple_recovery=1
log_timestamps=system
transaction_write_set_extraction=MURMUR32
show_compatibility_56=on