innodb 配置

官方链接辟邪

innodb_buffer_pool_size

• 默认值:128MB
• 如果大于1G，建议拆分instance
• 配置官方说明

innodb_buffer_pool_instances=16
innodb_buffer_pool_size=2GB

调整为3GB

SET GLOBAL innodb_buffer_pool_size=3221225472;

因为 innodb_buffer_pool_chunk_size 默认128MB
innodb_buffer_pool_chunk_size * innodb_buffer_pool_instances =2GB
3GB不是2GB整数倍，所以自动扩展pool_size为4GB

SELECT @@innodb_buffer_pool_size/1024/1024/1024;
+------------------------------------------+
| @@innodb_buffer_pool_size/1024/1024/1024 |
+------------------------------------------+
|                           4.000000000000 |
+------------------------------------------+

innodb_buffer_pool_chunk_size

• 默认值：128MB
• 可以动态调整，注意，会引起 innodb_buffer_pool_size 变化

innodb_buffer_pool_instances

chunk_size 减少1MB 133169152
innodb_buffer_pool_size 也会调整

innodb_buffer_pool_instances=16
innodb_buffer_pool_size=2GB
innodb_buffer_pool_chunk_size =133169152

mysql> SELECT @@innodb_buffer_pool_size/1024/1024/1024;
+------------------------------------------+
| @@innodb_buffer_pool_size/1024/1024/1024 |
+------------------------------------------+
|                           3.968750000000 |
+------------------------------------------+