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；