Query OK,0rows affected (0.16sec) mysql>select*fromstudents_bak; Emptyset(0.00sec) mysql>setautocommit=off; Query OK,0rows affected (0.01sec) mysql>select*fromstudents3;+-----+-------+--------+---------+--------
TRUNCATE [TABLE] 表名 其中,TABLE 关键字可省略。 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 ...
TABLEoperations may cause a temporary drop in system performance due to an LRU scan that occurs when removing anInnoDBtable's adaptive hash index entries. The problem was addressed forDROP TABLEin MySQL 5.5.23 (Bug #13704145, Bug #64284) but remains a known issue forTRUNCATE TABLE(Bug #...
Replication of the mysql System Schema Replication and the Query Optimizer Replication and Partitioning Replication and REPAIR TABLE Replication and Reserved Words Replication and Row Searches Replication and Source or Replica Shutdowns Replica Errors During Replication Replication and Server SQL...
DELETE FROM table和TRUNCATE TABLE是两种不同的数据库操作,用于从MySQL数据库的表中删除数据。它们有以下区别: 操作方式:DELETE FROM table是一种逐行删除的操作,它会逐个删除表中的每一行数据,并且可以带有条件进行过滤。而TRUNCATE TABLE操作是将整个表的内容一次性清空,相当于删除并重新创建一个空表。
The problem appears when I truncate/empty table.Suppose that before truncating the table there where 10 entries in it,from 1 to 10. After truncation takes place the new entry has an ID of 11. After truncation I would expect that the ID would be 1.Why that happens ...
45 mysql truncate 的实现 前言 truncate 是一个我们也经常会使用到的命令 其作用类似于 delete from $table; 但是 他会比 delete 块很多,这里我们来看一下 它的实现 delete 的时候会逐行进行处理, 打上 删除标记, 然后 由后台任务 进行数据处理 truncate table的实现...
Summary: in this tutorial, you will learn how to use the MySQL TRUNCATE TABLE statement to delete all data in a table. Introduction to MySQL TRUNCATE TABLE statement The MySQL TRUNCATE TABLE statement allows you to delete all data in a table. Therefore it is like a DELETE statement without ...
在MySQL中，delete和truncate都是常用的删除数据的方式，但它们之间存在着一些区别。且往下看，万一面试遇到呢？一、delete的用法和示例 delete语句用于删除表中的数据，可以根据条件删除一条或多条数据，语法如下：DELETE FROM table_name WHERE condition;其中，table_name是要删除数据的表名，condition是删除数据的条件...
耗时的过程在que_eval_sql: query: PROCEDURE DROP_TABLE_PROC ---> dict_drop_index_tree; row_drop_single_table_tablespace的耗时被 MySQL 5.7 配置innodb_flush_method=O_DIRECT优化了。 Q2:该优化是否适用于 MySQL 8.0? 设置innodb_flush_method=O_DIRECT的优化操作,同样适用于 MySQL 8.0。