oracle 利用flashback将备库激活为read wirte(10g 及上) 环境: OS: CENTOS 6.5 X64 DB: ORACLE 10.2.0.5 主库操作: SQL> alter system switch logfile; System altered. SQL> 备库操作 取消归档应用 SQL> alter database recover managed standby database cancel; Database altered. SQL> 创建还原点 SQL> create restore point restore_point_dg guarantee flashback database; Restore point created. SQL> 主库操作 将备库的归档目的设置为defer(这样后台不会报错，防止主库传输数据到备库) 官方解释 defer Specifies that valid destination information and attributes are preserved, but the destination is excluded from archiving operations until re-enable SQL> alter system set log_archive_dest_state_2=defer; 将备库激活为read/wirte SQL> alter database activate standby database; Database altered. SQL> alter database open; Database altered. SQL> 备库状态为read/write SQL> select open_mode from v$database; OPEN_MODE ---------- READ WRITE SQL> 这样我们可以在备库Export操作了 [oracle@oracle10g-dg2-213-101 backup]$ expdp directory=backup dumpfile=test1`date +%F`.dmp logfile=test1`date +%F`.log schemas=test1 Export: Release 10.2.0.5.0 - 64bit Production on Monday, 15 September, 2014 22:37:17 Copyright (c) 2003, 2007, Oracle. All rights reserved. Username: / as sysdba Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Starting "SYS"."SYS_EXPORT_SCHEMA_01": /******** AS SYSDBA directory=backup dumpfile=test12014-09-15.dmp logfile=test12014-09-15.log schemas=test1 Estimate in progress using BLOCKS method... Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA Total estimation using BLOCKS method: 64 KB Processing object type SCHEMA_EXPORT/USER Processing object type SCHEMA_EXPORT/SYSTEM_GRANT Processing object type SCHEMA_EXPORT/ROLE_GRANT Processing object type SCHEMA_EXPORT/DEFAULT_ROLE Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA Processing object type SCHEMA_EXPORT/TABLE/TABLE Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS . . exported "TEST1"."TEST" 4.960 KB 5 rows Master table "SYS"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded ****************************************************************************** Dump file set for SYS.SYS_EXPORT_SCHEMA_01 is: /u01/app/oracle/dump/test12014-09-15.dmp Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at 22:37:31 [oracle@oracle10g-dg2-213-101 backup]$ 主库操作 主库上添加记录 SQL> insert into test values(10); 1 row created. SQL> insert into test values(10); 1 row created. SQL> insert into test values(10); 1 row created. SQL> insert into test values(11); 1 row created. SQL> insert into test values(11); 1 row created. SQL> commit; Commit complete. System altered. SQL> SQL> conn / as sysdba Connected. SQL> alter system switch logfile; System altered. SQL> 备库操作 备库上删除表 [oracle@oracle10g-dg2-213-101 backup]$ sqlplus / as sysdba SQL*Plus: Release 10.2.0.5.0 - Production on Mon Sep 15 22:40:53 2014 Copyright (c) 1982, 2010, Oracle. All Rights Reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> conn test1/test1 Connected. SQL> drop table test purge; Table dropped. SQL> 准备重新恢复到dg备库环境 SQL> startup mount force; ORACLE instance started. Total System Global Area 704643072 bytes Fixed Size 2098912 bytes Variable Size 192940320 bytes Database Buffers 503316480 bytes Redo Buffers 6287360 bytes Database mounted. SQL> 闪回数据库 SQL> flashback database to restore point restore_point_dg; Flashback complete. SQL> SQL> shutdown immediate; ORA-01507: database not mounted ORACLE instance shut down. SQL> startup nomount; ORACLE instance started. Total System Global Area 704643072 bytes Fixed Size 2098912 bytes Variable Size 192940320 bytes Database Buffers 503316480 bytes Redo Buffers 6287360 bytes SQL> alter database mount standby database; ＃或者alter database convert to physical standby; Database altered. 主库操作 SQL> alter system set log_archive_dest_state_2=enable scope=both; System altered. SQL> 备库操作，检查进程是否正常 SQL> select process,status from v$managed_standby; PROCESS STATUS --------- ------------ ARCH CONNECTED ARCH CONNECTED ARCH CONNECTED MRP0 WAIT_FOR_LOG RFS IDLE RFS IDLE 6 rows selected. SQL> 主库操作 切换日志 SQL> alter system switch logfile; System altered. SQL> 备库已正常 FS[1]: Successfully opened standby log 8: '/u01/app/oracle/oradata/netdata/st_redo08a.log' Mon Sep 15 22:50:22 CST 2014 Media Recovery Log /u01/app/oracle/archive/netdata/1_79_857898543.arc Media Recovery Waiting for thread 1 sequence 80