Oracle中如何追踪savepoint

Oracle中的savepoint是事务中的标示符，以帮助我们做到部分操作的回滚。

我们可以通过trace找出会话中自上次commit以来所有的savepoint保存点，要阅读这些trace内容你需要有user_dump_dest目录的相关权限。

退回到命令行格式，该trace主要内容如下：


metalink中的相关介绍如下：

Subject:	How To Find Out The Savepoint For Current Process
	Doc ID:	108611.1	Type:	BULLETIN
	Modified Date:	16-JUN-2004	Status:	PUBLISHED

PURPOSE

-------

This information shows you how to get the savepoints you have

issued since the last commit was issued.

SCOPE & APPLICATION

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

Any user can follow the steps to find out the savepoints in

their own session.  However, only the the user who have read

permission to the user_dump_dest directory can view the

output.

Steps to Retrieve the Savepoint Issued after the Last Commit

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

In the following illustration, two savepoints are created in

the same session.  Then a savepoints dump is issued to get

the savepoint information.  An example of the dump file is

included.

SQL> insert into emp (empno, ename)

2  values (9995, 'vso');

1 row created.

SQL> savepoint pt1;

Savepoint created.

SQL> insert into emp (empno, ename)

2  values (9994, 'vso');

1 row created.

SQL> savepoint pt2;

Savepoint created.

SQL> alter session set events

2  'immediate trace name savepoints level 1';

Session altered.

A trace file is generated in the user_dump_directory.  The

content of the trace file is included in the following:

Dump file /u04/app/oracle/admin/R805/udump/r805_ora_18763.trc

Oracle8 Enterprise Edition Release 8.0.5.2.1 - Production

With the Partitioning and Objects options

PL/SQL Release 8.0.5.2.0 - Production

ORACLE_HOME = /u04/app/oracle/product/8.0.5

System name:    SunOS

Node name:      rtcsol1

Release:        5.6

Version:        Generic_105181-17

Machine:        sun4u

Instance name: R805

Redo thread mounted by this instance: 1

Oracle process number: 8

Unix process pid: 18763, image: oracleR805

*** 2000.04.18.14.11.37.000

*** SESSION ID:(7.391) 2000.04.18.14.11.37.000

====================================================

SAVEPOINT FOR CURRENT PROCESS

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

flag: 0x1

name: PT2

dba: 0x80020e, sequence #: 0, record #: 9, savepoint #: 131

status: VALID, next: 10a0868

name: PT1

dba: 0x80020e, sequence #: 0, record #: 7, savepoint #: 109

status: VALID, next: 0