Which four statements are true about truncating a table? A)Any insert triggers for the table will be executed. B)Any of the table’s indexes are also truncated. C)Any delete triggers for the table will be executed. D)All table storage can b
GTID是什么GTID是事务在第一次提交时获取到的唯一标识,该标识在整个的复制拓扑中具有唯一性。GTID组成GTID = source_id:transaction_id(c4e5d4a0-a9be-11e9-b444-080027f22add:7)直观看,GTID有两部分组成,source_id和transaction_id。source_id代表事务提交时所在的Master实例,一般是由
Created by Jerry Wang, last modified on May 28, 2014 可以基于该BAdI definition创建implementation来实现一些自定义逻辑: 指定filter的application name为CRM_ORDER, 激活BAdI implementation: 在BAdI implementation的实现里会记录当前ac
break:跳出所在的当前整个循环,到外层代码继续执行。 continue:跳出本次循环,从下一个迭代继续运行循环,内层循环执行完毕,外层代码继续运行。 return:直接返回函数,所有该函数体内的代码(包括循环体)都不会再执行。 用下边的示例代码来解释: def return_continue_break(type): if(n
之前发布过一篇博文 下单快发货慢:一个 JOIN SQL 引起 SqlClient 读取数据慢的奇特问题,当时遇到的问题是从 SQL Server 2008 R2 中查询获取 100 条记录竟然耗时 10 多秒,排查中发现问题与 SQL 查询中包含 INNER JOIN 有关,去掉 INNER JOIN 立马查询飞快。当时天真地以为原因是 JOIN
1.生成事务root@(none)>use pxc01Database changedroot@pxc01>create table tbx(id int);Query OK, 0 rows affected (0.15 sec)root@pxc01>insert into tbx values(1);Query OK, 1 row affected (0.13 sec)root@pxc01>select * from tbx;+------+| id |+------+|
79、Which statement is true about transactions? A. A set of Data Manipulation Language (DML) statements executed in a sequence ending with a SAVEPOINT forms a single transaction. B. Each Data Definition Language(DDL) statement executed forms a single trans
79、Which statement is true about transactions? A. A set of Data Manipulation Language (DML) statements executed in a sequence ending with a SAVEPOINT forms a single transaction. B. Each Data Definition Language(DDL) statement executed forms a single trans
一,没有优化的速度:Executed in 69.436 seconds drop table t purge; create table t(x int);/*清空共享池,注意在生产环境中千万不能做这步操作*/alter system flush shared_pool; create or replace procedure proc1as begin for i in 1 .. 100000 loop execute
进阶android,OKhttp源码分析——同步请求的源码分析 OKhttp是我们经常用到的框架,作为开发者们,我们不单单要学会灵活使用,还要知道他的源码是如何设计的。 今天我们来分析一下OKhttp 同步请求的执行流程和源码分析 so,老样子,我们先来一张图 从上图可以看出,不管是同步请求还是异步