MySQL8.0.20最優配置

#This configration file opts for MySQL 8.0.20
#Let us make an optimal MySQL configuration file template for product enviroment.
#
#I assume the MySQL Server as followings. You should tune the variables according to your server. 
#
#* 32 CPU core
#* 256G Memory
#* SSD storage with 20000 IOPS in 16K page size 

[client]
##client標籤設置mysql、mysqldump、mysqladmin的變量。
user = root
password = 1111aaA_

[mysql]
##mysql標籤設置mysql客戶端的變量。
prompt = [\\u@\\p][\\d]>\\_
tee = "/tmp/tee.log"  ##設置客戶端的查詢日誌
pager = "less -i -n -S"  ##分頁顯示查詢出的數據，方便搜索查詢到的數據
no-auto-rehash  ##關閉預讀取元數據

[mysqld_safe]

[mysqldump]
single-transaction

[mysqld]
# basic settings #
innodb_temp_data_file_path  ##研究一下這個參數設置成多少合適。
default_authentication_plugin=mysql_native_password
sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
##server_id = 8888
##datadir = /mysql_data/data
transaction_isolation = READ-COMMITTED
event_scheduler = OFF
open_files_limit = 327675 ##設置MySQL運行過程當中能夠打開的文件數，避免出現「too many open files」報錯。建議設置值使用公式：10+max_connections+(table_open_cache*2)。
secure_file_priv = /tmp

# connection #
interactive_timeout = 600 ##交互式鏈接超時時間（mysql工具、mysqldump工具等） wait_timeout = 600 ##非交互式鏈接超時時間。指鏈接mysql的api程序，jdbc鏈接等。
lock_wait_timeout = 1800  ##DDL操做的鎖等待時間
skip_name_resolve = ON
max_connections = 1024
max_user_connections = 256
max_connect_errors = 1000000

# table cache performance settings #
table_open_cache = 4096
table_definition_cache = 4096
table_open_cache_instances = 64

# 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

# optimizer switch settings #
optimizer_switch = 'index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=off,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on,use_invisible_indexes=off,skip_scan=on,hash_join=on'  ##優化器開關設置。

# log settings #
log_timestamps = system
##general_log = ON
##general_log_file = /usr/local/mysql/data/MySQL01-general.log
slow_query_log = ON
long_query_time = 1
##slow_query_log_file = /usr/local/mysql/data/MySQL01-slow.log
log_queries_not_using_indexes = ON
log_slow_admin_statements = ON
##log_slow_slave_statements = ON
log_throttle_queries_not_using_indexes = 10
expire_logs_days = 90
min_examined_row_limit = 100
log_bin_trust_function_creators = ON

# innodb settings #
innodb_buffer_pool_size = 160G
innodb_buffer_pool_instances = 16
innodb_page_cleaners = 16  ##設置page clean線程的個數。這個值推薦和innodb_buffer_poool_instances相等。該值大於innodb_buffer_poool_instances時，自動設置爲與innodb_buffer_poool_instances相同的值。
innodb_lru_scan_depth = 2048  ##控制LRU列表中可用頁的數量。默認值1024。寫密集型負載使IO飽和，或者使用機械盤時建議使用默認值。調整innodb_lru_scan_depth時，從一個較低的值開始，向上配置設置，目標是不多看到零空閒頁面。另外，在更改緩衝池實例的數量時，考慮調整innodb_lru_scan_depth，由於innodb_lru scan_depth*innodb_buffer_pool_instances定義了頁面清理線程每秒執行的工做量。推薦使用默認值。
innodb_fast_shutdown = 0  ##設置innodb關機模式。有效值0、一、2。0表示執行慢關機，即在關閉前完全清除和更改緩衝區合併，這種模式下開機是最快的；1表示關機時跳過上述操做，可是在開機時會執行上述操做，稱爲快關機；2表示刷新其日誌並冷關閉，不會丟失任何已提交的事務下，得到最快的關機，這種模式是開機最慢的。
innodb_max_dirty_pages_pct = 80  ##設置當緩衝池中髒頁達到百分之80時，強制進行checkpoint,將一部分髒頁刷新到磁盤上。默認值90。推薦值80。這個值不建議設置過小，設置過小會加劇IO的寫操做。
innodb_buffer_pool_dump_pct = 80  ##正常關機時將innodb_buffer_pool中百分之八十的數據保存到磁盤中
innodb_lock_wait_timeout = 5  ##innodb dml鎖的等待超時時間，單位秒。
innodb_rollback_on_timeout = ON  ##等待超時的事務進行回滾。
innodb_io_capacity = 400  ##設置後臺線程每秒操做IO的次數。默認值200。理想狀況下儘量低，若是太大會從緩衝池中清除過多的數據，反而使緩衝池失去了「緩衝」的做用。對於SSD磁盤默認值200已經足夠。15000轉的機械磁盤建議設置爲200。15000轉如下的機械磁盤建議設置爲100。
innodb_io_capacity_max = 2000  ##設置在刷新落後時，後臺任務執行的最大IOPS數。默認值2000。最小值也是2000。這個值在使用SSD磁盤時也無需調大。
innodb_flush_method = O_DIRECT
innodb_flush_neighbors = 0  ##對於SSD盤將這個值設置爲0。因爲該功能會使不怎麼髒的頁進行了寫入，然後該頁又會很快變成髒頁，而固態硬盤有超高的IOPS，所以要置爲0。可選值1表示刷新相同範圍內連續的髒頁，可選值2表示刷新相同範圍內的髒頁。
innodb_undo_tablespaces = 3
innodb_log_file_size = 1900MB  ##這個值是百度公司統一的。
innodb_log_files_in_group = 2
innodb_log_buffer_size = 64MB
innodb_checksum_algorithm = strict_crc32  ##設置innodb存儲引擎每次讀取頁時，使用checksum函數的哪一個算法。
innodb_thread_concurrency = 32
innodb_print_all_deadlocks = ON  ##將死鎖信息打印到mysql錯誤日誌中
innodb_sort_buffer_size = 64M
innodb_write_io_threads = 16
innodb_read_io_threads = 16
innodb_stats_persistent_sample_pages = 64
innodb_online_alter_log_max_size = 1G
innodb_open_files = 4096

# replication settings #
sync_binlog = 1  ##當有多個從庫，而且開啓了半同步複製這個值能夠設置成1000。百度公司在半同步複製時統一設置成1000。
##gtid_mode = ON
##enforce_gtid_consistency = ON
##binlog_gtid_simple_recovery = ON
log_slave_updates = OFF
binlog_rows_query_log_events = ON
relay_log_recovery = ON
##slave_skip_errors = ddl_exist_errors

# replication settings for slave #
##slave_parallel_workers = 16  ##設置多線程SQL線程數量
##slave_parallel_type = LOGICAL_CLOCK  ##設置多線程複製的模式
##slave_preserve_commit_order = ON
##slave_transaction_retries = 128

# semi sync replication settings #
##rpl_semi_sync_master_enabled = ON
##rpl_semi_sync_master_timeout = 1000

# semi sync replication settings for slave #
##rpl_semi_sync_slave_enabled = ON

# perforamnce_schema settings
performance_schema_digests_size = 40000
performance_schema_max_table_handles = 40000
performance_schema_max_table_instances = 40000
performance_schema_max_sql_text_length = 4096
performance_schema_max_digest_length = 4096

# group replication settings #
##plugin-load = "group_replication.so;validate_password.so;semisync_master.so;semisync_slave.so"
##transaction-write-set-extraction = XXHASH64
##report_host = 127.0.0.1 # optional for group replication
##binlog_checksum = NONE # only for group replication
##loose_group_replication = FORCE_PLUS_PERMANENT
##loose_group_replication_group_name = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
##loose_group_replication_compression_threshold = 100
##loose_group_replication_flow_control_mode = 0
##loose_group_replication_single_primary_mode = 0
##loose_group_replication_enforce_update_everywhere_checks = 1
##loose_group_replication_transaction_size_limit = 10485760
##loose_group_replication_unreachable_majority_timeout = 120
##loose_group_replication_start_on_boot = 0