// TRUNCATE// 默认规范配置// innodb_flush_method = on & innodb_flush_method = O_DIRECT(root@127.1)[eolbimsdb]08:44:4615>truncate table t5;QueryOK,0rowsaffected(0.98sec)// 设置 innodb_adaptive_hash_index = off(root@127.1
例1 新建表 tb_student_course,插入数据并查询,SQL 语句和运行结果如下: mysql>CREATE TABLE `tb_student_course` (-> `id`int(4) NOT NULL AUTO_INCREMENT,-> `name` varchar(25) NOT NULL,->PRIMARY KEY (`id`)->); Query OK,0rows affected (0.04sec) mysql> INSERT INTO tb_student_course(na...
Query OK, 0 rows affected (0.98 sec) // 设置 innodb_adaptive_hash_index = off (root@127.1) [eolbimsdb] 08:52:03 5> truncate table t5; Query OK, 0 rows affected (0.03 sec) // 设置 innodb_flush_method = fsync (root@127.1) [eolbimsdb] 09:03:34 28> truncate table t5; Query O...
适用于:Microsoft Fabric Microsoft Fabric SQL 数据库中的 SQL Server Azure SQL 数据库 Azure SQL 托管实例 Azure Synapse Analytics Analytics Platform System (PDW) Warehouse 删除表中的所有行或表中指定的分区,不记录单个行删除操作。 TRUNCATE TABLE与没有DELETE子句的WHERE语句类似;但是,速度更快,TRUNCATE ...
Query OK, 0 rows affected (0.19 sec) Q3: 能否优化?慢在哪里?post_ddl 如何调用? 从Q1 的结果中可以看出,执行的主要耗时在row_drop_table_for_mysql、os_file_delete_func: MySQL 8.0 的优化措施 row_drop_table_for_mysql慢的问题,可以通过设置innodb_adaptive_hash_index = off进行优化; ...
Next, we can verify this with this SQL query: SELECT * FROM Department; We can see the output of the executed SQL query: As seen above, all the records were deleted and the table still exists. 3. What Is aDELETEStatement In contrast to theTRUNCATEstatement,theDELETEstatement in SQL is ...
obclient [OBORACLE]> alter table OBORACLE.F2 disable constraint FK_ID; Query OK, 0 rows affected (0.056 sec) 再次truncate 表操作。 obclient [OBORACLE]> truncate table f1; ORA-00600: internal error code, arguments: -5594, Cannot truncate a table referenced in a foreign key constraint (`...
我必须在一个模型中运行这个sql例程:$this->db->query('TRUNCATE TABLE ordersSELECT * FROM orders_tmp');但我知道这个错误:无法执行请求的命令:处于锁定状态的表或正在运行的事务截尾表序 我在这 浏览2提问于2012-07-18得票数 3 2回答 清除Drupal缓存的其他方法 、 我们有一个繁忙的数据库服务器,当我们试...
Query OK, 0 rows affected (0.03 sec) // 设置 innodb_flush_method = fsync (root@127.1) [eolbimsdb] 09:03:34 28> truncate table t5; Query OK, 0 rows affected (1.04 sec) // 设置 innodb_adaptive_hash_index = off & innodb_flush_method = fsync ...
使用TRUNCATE 语句清空 tb_student_course 表中的记录,SQL 语句和运行结果如下: mysql> TRUNCATE TABLE tb_student_course; Query OK, 0 rows affected (0.04 sec) mysql> SELECT * FROM tb_student_course; Empty set (0.00 sec) 1. 2. 3.