5.禁用日志生成的,并且切换日志
SQL> alter system set "_disable_logging"=true;
System altered.
SQL> alter system switch logfile;
System altered.
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------
1 1 148 104857600 1 NO ACTIVE 262708457 14-APR-06
2 1 149 104857600 1 NO CURRENT 262708606 14-APR-06
3 1 147 104857600 1 NO INACTIVE 262675537 14-APR-06
6.SCOTT用户再更新
SQL> show parameter disable
NAME TYPE VALUE
------------------------------------
_disable_logging boolean TRUE
SQL> update emp set sal=4000 where empno=7788;
1 row updated.
SQL> commit;
Commit complete.
7.转储日志
SQL> ALTER SYSTEM DUMP LOGFILE '
/opt/oracle9/oradata/testora9/redo02.log';
System altered.
8.记录此时REDO信息
DUMP OF REDO FROM FILE '/opt/oracle9/oradata/testora9/redo02.log'
Opcodes *.*
DBA's: (file # 0, block # 0) thru (file # 65534, block # 4194303)
RBA's: 0x000000.00000000.0000 thru 0xffffffff.ffffffff.ffff
SCN's scn: 0x0000.00000000 thru scn: 0xffff.ffffffff
Times: creation thru eternity
FILE HEADER:
Software vsn=153092096=0x9200000, Compatibility Vsn=153092096=0x9200000
Db ID=1628068176=0x610a5950, Db Name='TESTORA9'
Activation ID=1628067152=0x610a5550
Control Seq=1163=0x48b, File size=204800=0x32000
File Number=2, Blksiz=512, File Type=2 LOG
descrip:"Thread 0001, Seq# 0000000149, SCN 0x00000fa89d7e-0xffffffffffff"
thread: 1 nab: 0xffffffff seq: 0x00000095 hws: 0x1 eot: 1 dis: 0
reset logs count: 0x1f435110 scn: 0x0000.00000001
Low scn: 0x0000.0fa89d7e 04/14/2006 09:33:43
Next scn: 0xffff.ffffffff 01/01/1988 00:00:00
Enabled scn: 0x0000.00000001 04/26/2004 15:56:10
Thread closed scn: 0x0000.0fa89d7e 04/14/2006 09:33:43
Log format vsn: 0x8000000 Disk cksum: 0xcac7 Calc cksum: 0xcac7
Terminal Recovery Stamp scn: 0x0000.00000000 01/01/1988 00:00:00
Most recent redo scn: 0x0000.00000000
Largest LWN: 0 blocks
End-of-redo stream : No
Unprotected mode
Miscellaneous flags: 0x0
END OF REDO DUMP
至此已经没有REDO的生成.数据库目前仅仅记录少量的必要信息。
(责任编辑:卢兆林)
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