我假设MySQL服务器如下。你应该根据你的服务器调整变量。

• 32个CPU核心

• 256G内存

• 在16K页面大小的情况下具有20000 IOPS的SSD存储

＃作者：jiangchengyao@gmail.com

[MySQL的]
prompt = [\\ u @ \\ h] [\\ d]> \\ _

的[mysqld]
＃ 基本设置 ＃
user = mysql
sql_mode =“STRICT_TRANS_TABLES，NO_ENGINE_SUBSTITUTION，NO_ZERO_DATE，NO_ZERO_IN_DATE，ERROR_FOR_DIVISION_BY_ZERO，NO_AUTO_CREATE_USER”
autocommit = 1
被character_set_server = utf8mb4
transaction_isolation = READ-COMMITTED
explicit_defaults_for_timestamp = 1
max_allowed_packet = 16777216
event_scheduler = 1

＃连接＃
interactive_timeout = 1800
wait_timeout = 1800
lock_wait_timeout = 1800
skip_name_resolve = 1
max_connections = 512
max_connect_errors = 1000000

＃表缓存性能设置
table_open_cache = 4096
table_definition_cache = 4096
table_open_cache_instances = 128

＃会话记忆设置＃
read_buffer_size = 16M
read_rnd_buffer_size = 32M
sort_buffer_size = 32M
tmp_table_size = 64M
join_buffer_size = 128M
thread_cache_size = 64

＃日志设置＃
log_error = error.log
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
binlog-rows-query-log-events = 1
log-bin-trust-function-creators = 1
expire-logs-days = 90
log-slave-updates = 1

＃innodb设置＃
innodb_page_size = 16384
innodb_buffer_pool_size = 160G
innodb_buffer_pool_instances = 16
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_lru_scan_depth = 4096
innodb_lock_wait_timeout = 5
innodb_io_capacity = 10000
innodb_io_capacity_max = 20000
innodb_flush_method = O_DIRECT
innodb_file_format =梭子鱼
innodb_file_format_max =梭子鱼
innodb_undo_logs = 128
innodb_undo_tablespaces = 3
innodb_flush_neighbors = 0
innodb_log_file_size = 17179869184
innodb_log_files_in_group = 2
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
innodb_write_io_threads = 16
innodb_read_io_threads = 16 
innodb_file_per_table = 1
innodb_stats_persistent_sample_pages = 64
innodb_autoinc_lock_mode = 2
innodb_online_alter_log_max_size = 1G
innodb_open_files = 4096

＃复制设置＃
master_info_repository = TABLE
relay_log_info_repository = TABLE
sync_binlog = 1
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
binlog_format = ROW
binlog_rows_query_log_events = 1
relay_log = relay.log
relay_log_recovery = 1
slave_skip_errors = ddl_exist_errors
slave-rows-search-algorithms ='INDEX_SCAN，HASH_SCAN'

＃半同步复制设置＃
plugin_load =“validate_password.so; rpl_semi_sync_master = semisync_master.so; rpl_semi_sync_slave = semisync_slave.so”
rpl_semi_sync_master_enabled = 1
rpl_semi_sync_master_timeout = 3000
rpl_semi_sync_slave_enabled = 1

＃密码插件＃
validate_password_policy =强
验证密码= FORCE_PLUS_PERMANENT

的[mysqld-5.6]
＃metalock性能设置
metadata_locks_hash_instances = 64

的[mysqld-5.7]
＃新的innodb设置＃
loose_innodb_numa_interleave = 1
innodb_buffer_pool_dump_pct = 40
innodb_page_cleaners = 16
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 2G
innodb_purge_rseg_truncate_frequency = 128
＃新的复制设置＃
slave-parallel-type = LOGICAL_CLOCK
slave-parallel-workers = 16
slave_preserve_commit_order = 1
slave_transaction_retries = 128
＃其他更改设置＃
binlog_gtid_simple_recovery = 1
log_timestamps =系统
show_compatibility_56 =上

新增加的参数有：

• metadata_locks_hash_instances = 64 -- 提升大并发下的元数据锁性能，注意该参数仅在MySQL 5.6版本下有效，5.7版本已经使用无锁结构进行优化
• innodb_open_files = 4096 -- 增大InnoDB层缓存文件句柄的数量
• table_open_cache = 4096 -- 增大缓存表的数量
• table_definition_cache = 4096 -- 调大缓存frm表的数量，很多小伙伴遇到这个问题，导致show table status运行时等待非常长的时间
• table_open_cache_instances = 128 -- 提升大并发下的性能
• thread_cache_size = 64 -- 增大线程缓存，提升短连接的性能。通常来说都用连接池技术进行长连接操作，但是最近有一个项目用了短连接，遇到了坑。
• innodb_online_alter_log_max_size=1G -- 增大内存，防止大表在DML比较多的场景下Online DDL操作失败

移除的参数有：

• relay_log_recovery = 1 -- 若开启GTID功能，crash safe功能无需开启此参数。具体可见官方文档说明

最后，对上篇文章拿走不谢，Flashback for MySQL 5.7做一下说明，在编辑时漏了下面一段话，可能大家产生了误解：

Flashback最早由淘宝的彭立勋同学开发，后集成在InnoSQL中，并由网易的同学持续开发与维护。

因此官方的mysqlbinlog是不包含flashback功能，下载文章中指定mysqlbinlog才有。另外，彭立勋同学表示MariaDB 10.3将支持DDL的flashback功能，大家期待吧。

转载：IMG

作者：姜 承尧

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