MySQL管理之道-筆記-MySQL5.7-在線調整innodb_buffer_pool_size不用重啟mysql進程
阿新 • • 發佈:2018-07-04
位置 mysq chunk ike global hunk 單位 數據頁 buffer
在線調整innodb_buffer_pool_size不用重啟mysql進程
MySQL5.7以前,調整innodb_buffer_pool_size需要重啟mysql進程才可以生效。
建議業務低峰時間執行
1 當前大小128M
root@localhost:mysql3306.sock [(none)]>show variables like ‘%innodb_buffer_pool_size%‘; +-------------------------+-----------+ | Variable_name | Value | +-------------------------+-----------+| innodb_buffer_pool_size | 134217728 | +-------------------------+-----------+ 1 row in set (0.03 sec) root@localhost:mysql3306.sock [(none)]>select 134217728/1024/1024; +---------------------+ | 134217728/1024/1024 | +---------------------+ | 128.00000000 | +---------------------+ 1 row in set (0.00 sec)
2 動態調整為256M
root@localhost:mysql3306.sock [(none)]>set global innodb_buffer_pool_size = 256*1024*1024; Query OK, 0 rows affected (0.18 sec) root@localhost:mysql3306.sock [(none)]>show variables like ‘%innodb_buffer_pool_size%‘; +-------------------------+-----------+ | Variable_name | Value | +-------------------------+-----------+ | innodb_buffer_pool_size | 268435456 | +-------------------------+-----------+ 1 row in set (0.02 sec) root@localhost:mysql3306.sock [(none)]>select 268435456/1024/1024; +---------------------+ | 268435456/1024/1024 | +---------------------+ | 256.00000000 | +---------------------+ 1 row in set (0.00 sec) root@localhost:mysql3306.sock [(none)]>select version(); +------------+ | version() | +------------+ | 5.7.18-log | +------------+ 1 row in set (0.03 sec)
調整時,內部會把數據頁移動到一個新的位置,單位是塊。如果想提升移動速度,則需要調整
innodb_buffer_pool_chunk_size的參數大小,默認是128M
innodb_buffer_pool_size/innodb_buffer_pool_instances = innodb_buffer_pool_chunk_size的參數大小,默認是128M
MySQL管理之道-筆記-MySQL5.7-在線調整innodb_buffer_pool_size不用重啟mysql進程