月归档：三月 2012

bbed解决ORA-01190

发表于 2012 年 3 月 15 日 由 惜分飞

当我们使用resetlogs方式打开数据库后，发现有数据文件处于offline状态，这个时候很可能就是悲剧降临的时候，很有可能这个文件文件在resetlogs之前就处于offline状态，然后你resetlogs之后，这个文件使用常规方法很难再online，会出现ORA-01190或者ORA-01189之类的错误。
一、模拟offline文件然后resetlogs操作

1.设置datafile 5数据文件offline
2.rman备份数据库
3.关闭原数据库，删除数据文件/当前日志和部分归档日志
4.执行不完全恢复，resetlogs打开数据库(如下面操作)
[oracle@xifenfei ora11g]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Thu Mar 15 07:36:59 2012

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> recover database until cancel;
ORA-00279: change 868870 generated at 03/15/2012 03:32:11 needed for thread 1
ORA-00289: suggestion :
/u01/oracle/oradata/archivelog/ora11g/1_29_777766629.dbf
ORA-00280: change 868870 for thread 1 is in sequence #29


Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
cancel
Media recovery cancelled.
SQL> alter database open resetlogs;

Database altered.

SQL> select file#,online_status,to_char(change#,'999999999999') from v$recover_file;

     FILE# ONLINE_STATUS  TO_CHAR(CHANGE#,'999999999
---------- -------------- --------------------------
         5 OFFLINE               868810

SQL> alter database datafile 5 online;
alter database datafile 5 online
*
ERROR at line 1:
ORA-01190: control file or data file 5 is from before the last RESETLOGS
ORA-01110: data file 5: '/u01/oracle/oradata/ora11g/xifenfei01.dbf'


SQL> select file#,to_char(checkpoint_change#,'999999999999'),
  2  to_char(last_change#,'999999999999') from v$datafile;

     FILE# TO_CHAR(CHECKPOINT_CHANGE# TO_CHAR(LAST_CHANGE#,'9999
---------- -------------------------- --------------------------
         1        868874
         2        868874
         3        868874
         4        868874
         5        868810                     868874

--可以看到offline的数据文件，没有因为resetlogs操作而改变
--CHECKPOINT_CHANGE#和RESETLOGS_CHANGE#信息
SQL> select file#,to_char(checkpoint_change#,'999999999999'),
  2  to_char(RESETLOGS_CHANGE#,'999999999999')
  3  from v$datafile_header;

     FILE# TO_CHAR(CHECKPOINT_CHANGE# TO_CHAR(RESETLOGS_CHANGE#,
---------- -------------------------- --------------------------
         1        868874                     868871
         2        868874                     868871
         3        868874                     868871
         4        868874                     868871
         5        868810                     787897

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

二、bbed修改相关项

下面两项与resetlogs相关
kcvfhrlc表示 reset logs count
kcvfhrls表示 resetlogs scn
下面四项与数据库文件scn相关
kscnbas (at offset 140) – SCN of last change to the datafile.
kcvcptim (at offset 148) - Time of the last change to the datafile.
kcvfhcpc (at offset 176) – Checkpoint count.
kcvfhccc (at offset 184) – Unknown, but is always 1 less than thecheckpoint point count.


BBED> set filename '/u01/oracle/oradata/ora11g/system01.dbf'
        FILENAME        /u01/oracle/oradata/ora11g/system01.dbf

BBED> p kcvfhrlc
ub4 kcvfhrlc                                @112      0x2e5eed37

BBED> p kcvfhrls
struct kcvfhrls, 8 bytes                    @116     
   ub4 kscnbas                              @116      0x000d4207
   ub2 kscnwrp                              @120      0x0000

       

BBED>  p kcvcpscn
struct kcvcpscn, 8 bytes                 @484 
   ub4 kscnbas                           @484      0x000d4495
   ub2 kscnwrp                           @488      0x0000
   
BBED> p kcvfhcpc
ub4 kcvfhcpc                                @140      0x00000078

BBED> p kcvfhccc
ub4 kcvfhccc                                @148      0x00000077

BBED> set filename '/u01/oracle/oradata/ora11g/xifenfei01.dbf'
        FILENAME        /u01/oracle/oradata/ora11g/xifenfei01.dbf

BBED> p kcvfhrlc
ub4 kcvfhrlc                                @112      0x2e5bc6e5

BBED> set mode edit
        MODE            Edit

BBED> m /x 37ed5e2e
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y

BBED> p kcvfhrlc
ub4 kcvfhrlc                                @112      0x2e5eed37

BBED> p kcvfhrls
struct kcvfhrls, 8 bytes                    @116     
   ub4 kscnbas                              @116      0x000c05b9
   ub2 kscnwrp                              @120      0x0000

BBED> m /x 07420d00

BBED> p kcvfhrls
struct kcvfhrls, 8 bytes                    @116     
   ub4 kscnbas                              @116      0x000d4207
   ub2 kscnwrp                              @120      0x0000

BBED>  p kcvcpscn
struct kcvcpscn, 8 bytes                 @484 
   ub4 kscnbas                           @484      0x000d41ca
   ub2 kscnwrp                           @488      0x0000
 
BBED> set offset 484
        OFFSET          484

BBED> m /x 95440d00
BBED-00209: invalid number (95440d00)

BBED> m /x 9544

BBED> set offset +2
        OFFSET          486

BBED> m /x 0d00

BBED> p kcvfhcpc
ub4 kcvfhcpc                                @140      0x00000003

BBED> m /x 78000000

BBED> p kcvfhcpc
ub4 kcvfhcpc                                @140      0x00000078

BBED> p kcvfhccc
ub4 kcvfhccc                                @148      0x00000002

BBED> m /x 77000000

BBED> p kcvfhccc
ub4 kcvfhccc                                @148      0x00000077

BBED> sum
Check value for File 0, Block 1:
current = 0xe079, required = 0x5940

BBED> sum apply
Check value for File 0, Block 1:
current = 0x5940, required = 0x5940
1

三、数据文件online

[oracle@xifenfei ora11g]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Thu Mar 15 07:48:48 2012

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area  368263168 bytes
Fixed Size                  1345016 bytes
Variable Size             301992456 bytes
Database Buffers           58720256 bytes
Redo Buffers                6205440 bytes
Database mounted.
Database opened.
SQL> select file#,to_char(checkpoint_change#,'999999999999'),
  2  to_char(RESETLOGS_CHANGE#,'999999999999')
  3  from v$datafile_header;

     FILE# TO_CHAR(CHECKPOINT_CHANGE# TO_CHAR(RESETLOGS_CHANGE#,
---------- -------------------------- --------------------------
         1        869528                     868871
         2        869528                     868871
         3        869528                     868871
         4        869528                     868871
         5        869525                     868871

SQL> recover datafile 5;
Media recovery complete.
SQL> alter database datafile 5 online;

Database altered.

姊妹篇:_allow_resetlogs_corruption和adjust_scn解决ORA-01190

发表在 非常规恢复 | 标签为 , | 4 条评论

在RAC中lsnrctl和srvctl操作监听区别

发表于 2012 年 3 月 14 日 由 惜分飞

朋友今天询问了一个问题RAC中使用srvctl 操作监听和lsnrctl 操作监听结果不一样，下面我通过实验说明问题
0.listener.ora文件内容

LISTENER_RAC1 =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip)(PORT = 1521)(IP = FIRST))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.11)(PORT = 1521)(IP = FIRST))
    )
  )

SID_LIST_LISTENER_RAC1 =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
      (PROGRAM = extproc)
    )
  )

1.srvctl 启动监听

rac1-> srvctl start listener -n rac1
rac1-> lsnrctl status

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 11-MAR-2012 22:09:34

Copyright (c) 1991, 2005, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER_RAC1
Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date                11-MAR-2012 22:07:21
Uptime                    0 days 0 hr. 2 min. 13 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/product/10.2.0/db_1/network/log/listener_rac1.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.21)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.11)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

rac1-> crs_stat -t
Name           Type           Target    State     Host        
------------------------------------------------------------
ora.....XFF.cs application    ONLINE    ONLINE    rac1        
ora....db1.srv application    ONLINE    ONLINE    rac2        
ora.devdb.db   application    ONLINE    ONLINE    rac2        
ora....b1.inst application    ONLINE    ONLINE    rac1        
ora....b2.inst application    ONLINE    ONLINE    rac2        
ora....SM1.asm application    ONLINE    ONLINE    rac1        
ora....C1.lsnr application    ONLINE    ONLINE    rac1        
ora.rac1.gsd   application    ONLINE    ONLINE    rac1        
ora.rac1.ons   application    ONLINE    ONLINE    rac1        
ora.rac1.vip   application    ONLINE    ONLINE    rac1        
ora....SM2.asm application    ONLINE    ONLINE    rac2        
ora....C2.lsnr application    ONLINE    ONLINE    rac2        
ora.rac2.gsd   application    ONLINE    ONLINE    rac2        
ora.rac2.ons   application    ONLINE    ONLINE    rac2        
ora.rac2.vip   application    ONLINE    ONLINE    rac2

srvctl操作监听，自动反馈到crs中

2.使用srvctl关闭监听

rac1-> srvctl stop listener -n rac1
rac1-> crs_stat -t
Name           Type           Target    State     Host        
------------------------------------------------------------
ora.....XFF.cs application    ONLINE    ONLINE    rac1        
ora....db1.srv application    ONLINE    ONLINE    rac2        
ora.devdb.db   application    ONLINE    ONLINE    rac2        
ora....b1.inst application    ONLINE    ONLINE    rac1        
ora....b2.inst application    ONLINE    ONLINE    rac2        
ora....SM1.asm application    ONLINE    ONLINE    rac1        
ora....C1.lsnr application    OFFLINE   OFFLINE               
ora.rac1.gsd   application    ONLINE    ONLINE    rac1        
ora.rac1.ons   application    ONLINE    ONLINE    rac1        
ora.rac1.vip   application    ONLINE    ONLINE    rac1        
ora....SM2.asm application    ONLINE    ONLINE    rac2        
ora....C2.lsnr application    ONLINE    ONLINE    rac2        
ora.rac2.gsd   application    ONLINE    ONLINE    rac2        
ora.rac2.ons   application    ONLINE    ONLINE    rac2        
ora.rac2.vip   application    ONLINE    ONLINE    rac2

3.使用lsnrctl查看监听状态

rac1-> lsnrctl status

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 11-MAR-2012 22:15:54

Copyright (c) 1991, 2005, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)) <--host为空
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 111: Connection refused



rac1-> lsnrctl 

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 11-MAR-2012 22:16:55

Copyright (c) 1991, 2005, Oracle.  All rights reserved.

Welcome to LSNRCTL, type "help" for information.

LSNRCTL> status listener_rac1
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=rac1-vip)(PORT=1521)(IP=FIRST)))
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 111: Connection refused
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.11)(PORT=1521)(IP=FIRST)))
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 111: Connection refused

这里可以发现问题:
1)如果当前没有监听在运行，使用lsnrctl status的时候，会去检查默认的监听名称为listener的监听，如果该监听不存在不会使用hostname填充到hostname项中(注意下面的启动默认监听过程)
2)lsnrctl查看指定监听为listener_rac1，发现和listener.ora中配置相同

4.lsnrctl 关闭监听

rac1-> srvctl start listener -n rac1
rac1-> lsnrctl stop

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 11-MAR-2012 22:43:14

Copyright (c) 1991, 2005, Oracle.  All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)) <--host为空
The command completed successfully
rac1-> crs_stat -t
Name           Type           Target    State     Host        
------------------------------------------------------------
ora.....XFF.cs application    ONLINE    ONLINE    rac1        
ora....db1.srv application    ONLINE    ONLINE    rac2        
ora.devdb.db   application    ONLINE    ONLINE    rac2        
ora....b1.inst application    ONLINE    ONLINE    rac1        
ora....b2.inst application    ONLINE    ONLINE    rac2        
ora....SM1.asm application    ONLINE    ONLINE    rac1        
ora....C1.lsnr application    OFFLINE   OFFLINE               
ora.rac1.gsd   application    ONLINE    ONLINE    rac1        
ora.rac1.ons   application    ONLINE    ONLINE    rac1        
ora.rac1.vip   application    ONLINE    ONLINE    rac1        
ora....SM2.asm application    ONLINE    ONLINE    rac2        
ora....C2.lsnr application    ONLINE    ONLINE    rac2        
ora.rac2.gsd   application    ONLINE    ONLINE    rac2        
ora.rac2.ons   application    ONLINE    ONLINE    rac2        
ora.rac2.vip   application    ONLINE    ONLINE    rac2

这里可以说明问题：
1)lsnrctl stop虽然是要停止掉默认监听，但是也会停止掉非默认监听
2)lsnrctl stop如果默认监听不存在，那么注册host也为空

5.使用lsnrctl启动默认监听

rac1-> lsnrctl start

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 11-MAR-2012 22:17:37

Copyright (c) 1991, 2005, Oracle.  All rights reserved.

Starting /u01/app/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 10.2.0.1.0 - Production
System parameter file is /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=rac1)(PORT=1521)))

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date                11-MAR-2012 22:17:37
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=rac1)(PORT=1521))) <--主机名
The listener supports no services
The command completed successfully

rac1-> crs_stat -t
Name           Type           Target    State     Host        
------------------------------------------------------------
ora.....XFF.cs application    ONLINE    ONLINE    rac1        
ora....db1.srv application    ONLINE    ONLINE    rac2        
ora.devdb.db   application    ONLINE    ONLINE    rac2        
ora....b1.inst application    ONLINE    ONLINE    rac1        
ora....b2.inst application    ONLINE    ONLINE    rac2        
ora....SM1.asm application    ONLINE    ONLINE    rac1        
ora....C1.lsnr application    OFFLINE   OFFLINE               
ora.rac1.gsd   application    ONLINE    ONLINE    rac1        
ora.rac1.ons   application    ONLINE    ONLINE    rac1        
ora.rac1.vip   application    ONLINE    ONLINE    rac1        
ora....SM2.asm application    ONLINE    ONLINE    rac2        
ora....C2.lsnr application    ONLINE    ONLINE    rac2        
ora.rac2.gsd   application    ONLINE    ONLINE    rac2        
ora.rac2.ons   application    ONLINE    ONLINE    rac2        
ora.rac2.vip   application    ONLINE    ONLINE    rac2

这里发现问题：
1)监听的ip只有主机名的一个，和srvctl启动的监听不一样
2)虽然监听启动了，crs中依然显示为offline状态

6.使用lsnrctl启动listener_rac1监听

LSNRCTL> start listener_rac1
Starting /u01/app/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 10.2.0.1.0 - Production
System parameter file is /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/product/10.2.0/db_1/network/log/listener_rac1.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.21)(PORT=1521)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.11)(PORT=1521)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=rac1-vip)(PORT=1521)(IP=FIRST)))
STATUS of the LISTENER
------------------------
Alias                     listener_rac1
Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date                11-MAR-2012 22:19:04
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/product/10.2.0/db_1/network/log/listener_rac1.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.21)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.11)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

rac1-> crs_stat -t
Name           Type           Target    State     Host        
------------------------------------------------------------
ora.....XFF.cs application    ONLINE    ONLINE    rac1        
ora....db1.srv application    ONLINE    ONLINE    rac2        
ora.devdb.db   application    ONLINE    ONLINE    rac2        
ora....b1.inst application    ONLINE    ONLINE    rac1        
ora....b2.inst application    ONLINE    ONLINE    rac2        
ora....SM1.asm application    ONLINE    ONLINE    rac1        
ora....C1.lsnr application    ONLINE    ONLINE    rac1        
ora.rac1.gsd   application    ONLINE    ONLINE    rac1        
ora.rac1.ons   application    ONLINE    ONLINE    rac1        
ora.rac1.vip   application    ONLINE    ONLINE    rac1        
ora....SM2.asm application    ONLINE    ONLINE    rac2        
ora....C2.lsnr application    ONLINE    ONLINE    rac2        
ora.rac2.gsd   application    ONLINE    ONLINE    rac2        
ora.rac2.ons   application    ONLINE    ONLINE    rac2        
ora.rac2.vip   application    ONLINE    ONLINE    rac2

这里可以说明两个问题:
1)使用lsnrctl启动监听和srvctl启动一样
2)启动listener_rac1后，crs中监听资源变成online

7.问题原因分析

rac1-> srvctl config listener -n rac1
rac1 LISTENER_RAC1

通过这里可以发现，其实srvctl操作的监听就是LISTENER_RAC1，所以当我使用lsnrctl 操作LISTENER_RAC1监听时候crs会自动offline或者online，而lsnrctl 操作默认监听时crs不会online

发表在 Oracle RAC | 2 条评论

误删除dual表恢复

发表于 2012 年 3 月 13 日 由 惜分飞

1.10G中删除dual表恢复

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

SQL> select object_type,owner from dba_objects where object_name='DUAL';

OBJECT_TYPE         OWNER
------------------- ------------------------------
TABLE               SYS
SYNONYM             PUBLIC

SQL> drop table sys.dual;

Table dropped.

SQL> select object_type from dba_objects where object_name='DUAL';

OBJECT_TYPE
-------------------
SYNONYM

SQL> SELECT SYSDATE FROM dual;
SELECT SYSDATE FROM dual
                    *
ERROR at line 1:
ORA-01775: looping chain of synonyms


SQL> CREATE TABLE XFF AS SELECT * from dba_objects;

Table created.

SQL> drop table xff purge;
drop table xff purge
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-01775: looping chain of synonyms


设置10046跟踪会话发现，在每次删除表操作的时候发现如下错误
select dummy from dual where  ora_dict_obj_type = 'TABLE'

其实这里错误都很明显，是因为dual表不存在了，表对应的同义词还存在，当查询dual的时候，会去查询同义词，然后该同义词去找表，而表不存在，所以出现上述的ORA-01775: looping chain of synonyms错误

2.解决方法

SQL> CREATE TABLE "SYS"."DUAL" 
  2     (       "DUMMY" VARCHAR2(1)
  3     ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  4    STORAGE(INITIAL 16384 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  5    PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  6    TABLESPACE "SYSTEM" ;

Table created.

SQL> GRANT SELECT ON "SYS"."DUAL" TO PUBLIC WITH GRANT OPTION;

Grant succeeded.

SQL> insert into dual values('X');

1 row created.

SQL> COMMIT;

Commit complete.

--编译对象
SQL> @?/rdbms/admin/utlrp.sql

3.测试结果


SQL> select sysdate from dual;

SYSDATE
------------
13-MAR-12

SQL> drop table xff purge;

Table dropped.
发表在 Oracle | 2 条评论