MySQL tuning parameters

Magic conch 2021-01-21 00:37:22
mysql tuning parameters

Parameter type

It is divided into dynamic parameters and static parameters .

Dynamic parameters : adopt set global and set session Set it up .

Static parameters : Need modification my.cnf file , Then restart the instance to take effect .

Table space

Define table space path 、 Initial size ( Default 10m)、 Automatic expansion strategy ( Default 64m)


The initial size is recommended to be 1G.

The first mock exam mode

The first mock exam mode : More secure data innodb_flush_log_at_trx_commit=1 sync_binlog=1

Dirty page refresh

The first mock exam is the one mode. redo log and binlog Memory to file to disk refresh mechanism based on . Here is the refresh mechanism of data to disk .

innodb_max_dirty_pages_pct, Represents the percentage of dirty pages , Default 75%. Set to 25%-50%, Avoid the impact of later refresh TPS.

innodb_adaptive_flushing, adaptive flushing , On by default .

Insert cache

Improve DML Operating performance .

innodb_change_buffer_max_size, It is suggested to be changed to 50.

InnoDB Buffer pool memory size

innodb_buffer_pool_size, The server only runs a database application , It is suggested to be changed to In memory 50%-80%. Can support online modification , So you don't need to set it too large in the early stage .

innodb_buffer_pool_instance, Improve concurrency , Avoid memory contention . The default is 1, Recommended setting is 8.

How long does the server wait before closing the interactive connection



The two parameter settings are consistent , Avoid excessive connection time , Default 28800(8 Hours ), Recommended setting is 300-600s

The isolation level of the transaction

transaction_isolation, There are four isolation levels . The default is REPEATABLE-READ, Repeatable .

Can be opened at the same time .idb Number of files


The default is 300, It is suggested to adjust it to 65535.

MySQL maximum connection

max_connections, The default is 151.

More than one connection is common "too mang connections".

Setting too large is easy to cause instance downtime .

InnoDB Number of concurrent threads

innodb_thread_concurrency, It is suggested to adjust to service CPU Twice the number of cores .

The slow query

slow_query_log, Recommended Opening

long_query_time, Default 10s, Log when slow query times out

log_queries_not_using_indexes, Not indexed sql, Slow query log is also recorded .

Server node unique ID

server_id, The default is 0

IO Performance indicators

innodb_io_capacity, Default 200, Use ssd The parameters can be adjusted up .

《MySQL The way to the top 》 Zhang Su (sū)

本文为[Magic conch]所创,转载请带上原文链接,感谢

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