| 标题 | Oracle RAC 执行闪回数据库操作 |
| 范文 | [oracle@zhongwc1 ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.3.0 Production on Wed Jan 23 17:02:01 2013 Copyright (c) 1982, 2011, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing options SQL> set lines 200 SQL> select instance_name,host_name from v$instance; INSTANCE_NAME HOST_NAME ---------------- ---------------------------------------------------------------- zhongwc1 zhongwc1.oracle.com SQL> select instance_name,host_name from gv$instance; INSTANCE_NAME HOST_NAME ---------------- ---------------------------------------------------------------- zhongwc1 zhongwc1.oracle.com zhongwc2 zhongwc2.oracle.com SQL> select flashback_on from v$database; FLASHBACK_ON ------------------ NO SQL> show release release 1102000300 SQL> alter database flashback on; Database altered. SQL> select flashback_on from v$database; FLASHBACK_ON ------------------ YES SQL> conn zwc Enter password: Connected. SQL> create table t_zhongwc as select * from dba_objects; Table created. SQL> select count(*) from t_zhongwc; COUNT(*) ---------- 75289 SQL> 记录当前的scn(oracle11gR2可以在open状态flashback on) SQL> select current_scn from v$database; CURRENT_SCN ----------- 1395475 截断t_zhongwc表 SQL> truncate table t_zhongwc; Table truncated. SQL> select count(*) from t_zhongwc; COUNT(*) ---------- 0 开始执行闪回,关闭所有实例，启动zhongwc1到mount,闪回到scn 1395475,以只读模式打开验证 [oracle@zhongwc1 ~]$ srvctl stop database -d zhongwc [oracle@zhongwc1 ~]$ su - grid -c "crsctl stat res -t" Password: -------------------------------------------------------------------------------- NAME TARGET STATE SERVER STATE_DETAILS -------------------------------------------------------------------------------- Local Resources -------------------------------------------------------------------------------- ora.CRS.dg ONLINE ONLINE zhongwc1 ONLINE ONLINE zhongwc2 ora.DATADG.dg ONLINE ONLINE zhongwc1 ONLINE ONLINE zhongwc2 ora.FRADG.dg ONLINE ONLINE zhongwc1 ONLINE ONLINE zhongwc2 ora.LISTENER.lsnr ONLINE ONLINE zhongwc1 ONLINE ONLINE zhongwc2 ora.asm ONLINE ONLINE zhongwc1 Started ONLINE ONLINE zhongwc2 Started ora.gsd OFFLINE OFFLINE zhongwc1 OFFLINE OFFLINE zhongwc2 ora.net1.network ONLINE ONLINE zhongwc1 ONLINE ONLINE zhongwc2 ora.ons ONLINE ONLINE zhongwc1 ONLINE ONLINE zhongwc2 -------------------------------------------------------------------------------- Cluster Resources -------------------------------------------------------------------------------- ora.LISTENER_SCAN1.lsnr 1 ONLINE ONLINE zhongwc1 ora.cvu 1 ONLINE ONLINE zhongwc1 ora.oc4j 1 ONLINE ONLINE zhongwc1 ora.scan1.vip 1 ONLINE ONLINE zhongwc1 ora.zhongwc.db 1 OFFLINE OFFLINE Instance Shutdown 2 OFFLINE OFFLINE Instance Shutdown ora.zhongwc1.vip 1 ONLINE ONLINE zhongwc1 ora.zhongwc2.vip 1 ONLINE ONLINE zhongwc2 [oracle@zhongwc1 ~]$ [oracle@zhongwc1 ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.3.0 Production on Wed Jan 23 17:22:40 2013 Copyright (c) 1982, 2011, Oracle. All rights reserved. Connected to an idle instance. SQL> startup mount ORACLE instance started. Total System Global Area 1269366784 bytes Fixed Size 2227984 bytes Variable Size 889192688 bytes Database Buffers 369098752 bytes Redo Buffers 8847360 bytes Database mounted. SQL> flashback database to scn 1395475; Flashback complete. SQL> alter database open read only; Database altered. SQL> conn zwc Enter password: Connected. SQL> select count(*) from t_zhongwc; COUNT(*) ---------- 75289 resetlogs打开数据库,启动zhongwc2 SQL> shutdown immediate ORA-01031: insufficient privileges SQL> conn / as sysdba Connected. SQL> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORACLE instance started. Total System Global Area 1269366784 bytes Fixed Size 2227984 bytes Variable Size 889192688 bytes Database Buffers 369098752 bytes Redo Buffers 8847360 bytes Database mounted. SQL> alter database open resetlogs; Database altered. SQL> !srvctl start instance -d zhongwc -i zhongwc2 SQL> col host_name format a20 SQL> set lines 300 SQL> select INSTANCE_NAME,HOST_NAME,VERSION,STARTUP_TIME,STATUS,ACTIVE_STATE,INSTANCE_ROLE,DATABASE_STATUS from gv$INSTANCE; INSTANCE_NAME HOST_NAME VERSION STARTUP_TIME STATUS ACTIVE_ST INSTANCE_ROLE DATABASE_STATUS ---------------- -------------------- ----------------- ----------------------- ------------ --------- ------------------ ----------------- zhongwc1 zhongwc1.oracle.com 11.2.0.3.0 23-JAN-2013 17:30:37 OPEN NORMAL PRIMARY_INSTANCE ACTIVE zhongwc2 zhongwc2.oracle.com 11.2.0.3.0 23-JAN-2013 17:34:30 OPEN NORMAL PRIMARY_INSTANCE ACTIVE 也可以基于时间戳进行闪回数据库 SQL> select to_char(scn_to_timestamp(1395475),'yyyy-mm-dd hh24:mi:ss') time_stamp from dual; TIME_STAMP ------------------- 2013-01-23 17:14:05 SQL> flashback database to timestamp to_timestamp('2013-01-23 17:14:05','yyyy-mm-dd hh24:mi:ss'); flashback database to timestamp to_timestamp('2013-01-23 17:14:05','yyyy-mm-dd hh24:mi:ss') * ERROR at line 1: ORA-38757: Database must be mounted and not open to FLASHBACK. |
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