MySQL 版本 8.0.32-0ubuntu0.20.04.2
CREATE TABLE big_table (
pk INT AUTO_INCREMENT PRIMARY KEY,
field1 VARCHAR(255),
field2 VARCHAR(255),
field3 mediumtext,
field4 BIGINT,
KEY idx_field4 (field4)
) ENGINE=MyISAM CHARSET=utf8mb3;
插入1500万行。
SELECT COUNT(pk) FROM big_table;
+---------------+
| count(pk) |
+---------------+
| 15911974 |
+---------------+
1 row in set (0.57 sec)
ALTER TABLE big_table ENGINE=INNODB;
SELECT COUNT(pk) FROM big_table;
+---------------+
| count(pk) |
+---------------+
| 15911974 |
+---------------+
1 row in set (10.23 sec)
**设置 innodb_buffer_pool_size=8G(原为 128Mb)(重启 MySQL)**
SELECT COUNT(pk) FROM big_table;
+---------------+
| count(pk) |
+---------------+
| 15911974 |
+---------------+
1 row in set (1 min 18.67 sec)