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分类: 服务器与存储

2008-06-16 19:31:58

 六. SPFILE的备份与恢复
  
  在本文开篇我们提到,Oracle把Spfile也纳入到Rman的备份恢复策略当中,如果你配置了控制文件自动备份(autoback),那么Oracle会在数据库发生重大变化(如增减表空间)时自动进行控制文件及Spfile文件的备份。
  
  下面我们来看一下这个过程:
  
  a. 设置控制文件自动备份:
  
  [@jumper ]$ rman target /
  
  Recovery Manager: Release 9.2.0.3.0 - Production
  
  Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
  
  connected to target database: HSJF (DBID=1052178311)
  
  RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;
  
  using target database controlfile instead of recovery catalog
  old RMAN configuration parameters:
  CONFIGURE CONTROLFILE AUTOBACKUP OFF;
  new RMAN configuration parameters:
  CONFIGURE CONTROLFILE AUTOBACKUP ON;
  new RMAN configuration parameters are successfully stored
  
  RMAN> exit
  
  这个设置可以在数据库中通过如下方式查询得到:
  
  [@jumper bdump]$ sqlplus "/ as sysdba"
  
  SQL*Plus: Release 9.2.0.3.0 - Production on Sat Jan 17 01:08:05 2004
  
  Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
  
  Connected to:
  Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production
  With the Partitioning, OLAP and Oracle Data Mining options
  JServer Release 9.2.0.3.0 - Production
  
  SQL> select * from v$rman_configuration;
  CONF# NAME VALUE
  ---------- ------------------------- ----------
  1 CONTROLFILE AUTOBACKUP ON
  
  b. 记录数据库变化
  
  SQL> create tablespace eygle
  2 datafile '/data1//oradata/eygle01.dbf'
  3 size 5M;
  
  Tablespace created.
  
  如果新创建一个表空间,这时候检查alert.log文件,你可以在其中发现这样的备份信息:
  
  Sat Jan 17 00:55:57 2004Starting control autobackupControl autobackup written to DISK devicehandle '/opt//product/9.2.0/dbs/c-1052178311-20040117-00'Completed: create tablespace eygledatafile '/data1//oradata/eygle01.dbf’
  
  如果使用rman进行备份,在提示中你可以看到如下信息:
  
  RMAN> configure controlfile autobackup on;
  
  old RMAN configuration parameters:
  CONFIGURE CONTROLFILE AUTOBACKUP OFF;
  new RMAN configuration parameters:
  CONFIGURE CONTROLFILE AUTOBACKUP ON;
  new RMAN configuration parameters are successfully stored
  
  RMAN> run
  2> {
  3> allocate channel ch1 type disk format='e:\\orabak\penny%t.arc';
  4> backup archivelog all delete all input;
  5> release channel ch1;
  6> }
  
  allocated channel: ch1
  channel ch1: sid=13 devtype=DISK
  
  Starting backup at 02-DEC-03
  current log archived
  channel ch1: starting archive log backupset
  channel ch1: specifying archive log(s) in backup set
  input archive log thread=1 sequence=63 recid=168 stamp=511712617
  input archive log thread=1 sequence=64 recid=169 stamp=511712620
  input archive log thread=1 sequence=65 recid=170 stamp=511712626
  input archive log thread=1 sequence=66 recid=171 stamp=511712690
  channel ch1: starting piece 1 at 02-DEC-03
  channel ch1: finished piece 1 at 02-DEC-03
  piece handle=E:\ORACLE\ORABAK\PENNY511712693.ARC comment=NONE
  channel ch1: backup set complete, elapsed time: 00:00:03
  channel ch1: deleting archive log(s)
  archive log filename=E:\ORACLE\ORADATA\PENNY\ARCHIVE\1_63.DBF recid=168 stamp=511712617
  archive log filename=E:\ORACLE\ORADATA\PENNY\ARCHIVE\1_64.DBF recid=169 stamp=511712620
  archive log filename=E:\ORACLE\ORADATA\PENNY\ARCHIVE\1_65.DBF recid=170 stamp=511712626
  archive log filename=E:\ORACLE\ORADATA\PENNY\ARCHIVE\1_66.DBF recid=171 stamp=511712690
  Finished backup at 02-DEC-03
  
  Starting Control File and SPFILE Autobackup at 02-DEC-03
  piece handle=E:\ORACLE\ORA92\DATABASE\C-3627775766-20031202-01 comment=NONE
  Finished Control File and SPFILE Autobackup at 02-DEC-03
  
  released channel: ch1
  
  我们简单看一下自动备份的控制文件及spfile文件的格式及命名规则:
  c-IIIIIIIIII-YYYYMMDD-QQ
  c ------------------------控制文件
  IIIIIIIIII---------DBID
  YYYYMMDD------------时间戳
  QQ----------------------序号00-FF,16进制表示
  
  c. 使用自动备份恢复spfile文件
  
  [@jumper bdump]$ rman target /
  
  Recovery Manager: Release 9.2.0.3.0 - Production
  
  Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
  
  connected to target database: HSJF (DBID=1052178311)
  
  RMAN> restore spfile to '/tmp/spfileeygle.ora' from autobackup;
  
  Starting restore at 17-JAN-04
  
  using target database controlfile instead of recovery catalog
  allocated channel: ORA_DISK_1
  channel ORA_DISK_1: sid=18 devtype=DISK
  channel ORA_DISK_1: looking for autobackup on day: 20040117
  channel ORA_DISK_1: autobackup found: c-1052178311-20040117-01
  channel ORA_DISK_1: SPFILE restore from autobackup complete
  Finished restore at 17-JAN-04
  
  RMAN> exit
  
  Recovery Manager complete.
  [@jumper bdump]$ ls -l /tmp/spfileeygle.ora
  -rw-r----- 1 dba 3584 1月 17 09:34 /tmp/spfileeygle.ora
  
  你同样可以通过这种方法恢复控制文件,示例如下:
  
  [@jumper bdump]$ rman target /
  
  Recovery Manager: Release 9.2.0.3.0 - Production
  
  Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.
  
  connected to target database: HSJF (DBID=1052178311)
  
  RMAN> restore controlfile to '/tmp/control01.ctl' from autobackup;
  
  Starting restore at 17-JAN-04
  
  using target database controlfile instead of recovery catalog
  allocated channel: ORA_DISK_1
  channel ORA_DISK_1: sid=10 devtype=DISK
  channel ORA_DISK_1: looking for autobackup on day: 20040117
  channel ORA_DISK_1: autobackup found: c-1052178311-20040117-02
  channel ORA_DISK_1: controlfile restore from autobackup complete
  Finished restore at 17-JAN-04
  
  RMAN> exit
  
  Recovery Manager complete.
  [@jumper bdump]$ ls -l /tmp/control*
  -rw-r----- 1 dba 1892352 1月 17 09:44 /tmp/control01.ctl
  
  Oracle9i自动备份控制文件的功能给我们带来了极大的收益,通过自动备份,在数据库出现紧急状况的时候,你可能可以从这个自动备份中获得更为有效及时的控制文件.
  
  缺省的,这个自动备份功能是关闭的,你可以用我们上面提到的方法打开该功能.
  
  七. 设置Events事件
  
  Events事件是Oracle的重要诊断工具及问题解决办法,很多时候需要通过Events设置来屏蔽或者更改Oracle的行为,下面我们来看一下怎样修改spfile,增加Events事件设置:
  
  SQL> alter system set event='10841 trace name context forever' scope=spfile;
  
  System altered.
  
  SQL> startup force;
  ORACLE instance started.
  
  Total System Global Area 101782380 bytes
  Fixed Size 451436 bytes
  Variable Size 75497472 bytes
  Database Buffers 25165824 bytes
  Redo Buffers 667648 bytes
  Database mounted.
  Database opened.
  SQL> show parameter event
  
  NAME TYPE VALUE
  ------------------------------------ ----------- ------------------------------
  event string 10841 trace name context forever
  
  顺便提一句,10841事件是用于解决Oracle9i中JDBC Thin Driver问题的一个方法,如果你的alert.log文件中出现以下错误提示:
  
  Wed Jan 7 17:17:08 2004
  Errors in file /opt//admin/phsdb/udump/phsdb_ora_1775.trc:
  ORA-00600: internal error code, argument
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