mysql的最优化配置

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可以通过 此链接 进行下载mysql的配置文件。

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。

补充,mysql的配置:

# author: jiangchengyao@gmail.com

[mysql]

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

[mysqld]

# basic settings #

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

character_set_server=utf8mb4

transaction_isolation = READ-COMMITTED

explicit_defaults_for_timestamp = 1

max_allowed_packet = 16777216

event_scheduler = 1

# connection #

interactive_timeout = 1800

wait_timeout = 1800

lock_wait_timeout = 1800

skip_name_resolve = 1

max_connections = 512

max_connect_errors = 1000000

# table cache performance settings

table_open_cache = 4096

table_definition_cache = 4096

table_open_cache_instances = 128

# session memory settings #

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

# log settings #

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 settings #

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 = Barracuda

innodb_file_format_max = Barracuda

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

# replication settings #

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’

# semi sync replication settings #

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

# password plugin #

validate_password_policy=STRONG

validate-password=FORCE_PLUS_PERMANENT

[mysqld-5.6]

# metalock performance settings

metadata_locks_hash_instances=64

[mysqld-5.7]

# new innodb settings #

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

# new replication settings #

slave-parallel-type = LOGICAL_CLOCK

slave-parallel-workers = 16

slave_preserve_commit_order=1

slave_transaction_retries=128

# other change settings #

binlog_gtid_simple_recovery=1

log_timestamps=system

show_compatibility_56=on

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