会话断开数据保存情况

Posted 2020-11-07

针对Oracle数据库来说，存在若干情况，会话断开，本次测试会话断开后，数据保留情况。

 --以下考虑都是基于事务修改未commit

【Oracle复合ACID 持久性Durability，解释说明：事务结束，数据永久保留commit or rollback】

 

情况A，会话exit方式，数据是否保留，是rollback or commit

select count(*) from t1;

40

delete t1 where id>15;

10 rows deleted.

exit

select count(*) from t1;

30

 #SQL*Plus 执行exit 命令，退出会话，执行commit操作

 

情况二、kill session ‘sid,serial#‘ immediate 方式

[email protected] >delete t1 where id>14;

2 rows deleted.

>select sid,serial# from v$session where username=‘HR‘;

       SID    SERIAL# 

---------- ----------      

  780         33

>alter system kill session ‘780,33‘ immediate;

 >select count(*) from hr.t1;

  COUNT(*)

----------         

30

  Kill session ，退出会话，执行rollback操作

 

情况三、kill spid 方式

>delete t1 where id>14;

2 rows deleted.

>select spid from v$process where addr=(select paddr from v$session where username=‘HR‘);

SPID 

------------------------ 

18695

 >! kill -9 18695

[email protected] >select count(*) from hr.t1;

  COUNT(*) 

----------      

   30

  Kill spid ，退出会话，执行rollback操作

 

情况四、shutdown immediate 方式

>delete t1 where id>14;

>shutdown immediate;

>startup

select count(*) from hr.t1;

        30

shutdown immediate，退出会话，执行rollback操作

情况四、shutdown abort方式

 >delete t1 where id>14;

>startup force;

 >select count(*) from hr.t1;

  COUNT(*)

----------        

30

 

shutdown abort，退出会话，执行rollback操作