alter session set events语句dump 控制文件头信息示例

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alter session set events 'immediate trace name controlf level 1';中level n的意义如下：

1 控制文件中的文件头信息
2 level 1 + 文件头信息
3 level 2 + 数据文件头信息
10 level 3
更详细的alter session set events--oracle -Oracle跟踪事件简介见http://blog.csdn.net/q947817003/article/details/16369041 第2小节。
个人见解：
在需要DBID进行数据恢复时，alter system dump logfile 'filename';明显适合更复杂的场景。

ALTER SYSTEM DUMP LOGFILE 'filename' DBA MIN fileno blockno DBA MAX fileno blockno;

详见：http://blog.csdn.net/q947817003/article/details/16370203

本实验命令如下：

SYS@ bys3>alter session set events 'immediate trace name controlf level 1'; --同样要求数据库是MOUNT/OPEN状态可执行语句
Session altered.
SYS@ bys3>oradebug setmypid; --此语句要用SYSDBA权限执行，普通DBA用户会报错：ORA-01031: insufficient privileges
Statement processed.
SYS@ bys3>oradebug tracefile_name --找出产生的TRACE文件名
/u01/app/oracle/product/11.2.0/dbhome_1/log/diag/rdbms/bys3/bys3/trace/bys3_ora_1788.trc
################################################################

查看产生的TRACE文件信息 --因只DUMP了控制文件头的信息，所以内容并不多。

Trace file /u01/app/oracle/product/11.2.0/dbhome_1/log/diag/rdbms/bys3/bys3/trace/bys3_ora_1788.trc
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1
System name:   Linux
Node name:   bys3.bys.com
Release:   2.6.32-200.13.1.el5uek
Version:   #1 SMP Wed Jul 27 20:21:26 EDT 2011
Machine:   i686
Instance name: bys3
Redo thread mounted by this instance: 1
Oracle process number: 17
Unix process pid: 1788, image: oracle@bys3.bys.com (TNS V1-V3)

*** 2013-11-17 15:08:09.573
*** SESSION ID:(43.881) 2013-11-17 15:08:09.573
*** CLIENT ID:() 2013-11-17 15:08:09.573
*** SERVICE NAME:(SYS$USERS) 2013-11-17 15:08:09.573
*** MODULE NAME:(sqlplus@bys3.bys.com (TNS V1-V3)) 2013-11-17 15:08:09.573
*** ACTION NAME:() 2013-11-17 15:08:09.573

DUMP OF CONTROL FILES, Seq # 1596 = 0x63c       DUMP的控制文件
V10 STYLE FILE HEADER:
   Compatibility Vsn = 186646528=0xb200000
   Db ID=3358363031=0xc82c8d97, Db Name='BYS3'  ---数据库的DBID和DB_NAME信息
   Activation ID=0=0x0
   Control Seq=1596=0x63c, File size=604=0x25c
   File Number=0, Blksiz=16384, File Type=1 CONTROL
*** END OF DUMP ***

*** 2013-11-17 15:08:13.584
Processing Oradebug command 'setmypid'
*** 2013-11-17 15:08:13.585
Oradebug command 'setmypid' console output: <none>
*** 2013-11-17 15:08:16.701
Processing Oradebug command 'tracefile_name'
*** 2013-11-17 15:08:16.701
Oradebug command 'tracefile_name' console output:
/u01/app/oracle/product/11.2.0/dbhome_1/log/diag/rdbms/bys3/bys3/trace/bys3_ora_1788.trc