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.
相关推荐
施嘉伟3 小时前
Oracle SQL Profile 固化执行计划实战说明施嘉伟5 小时前
Oracle 10046 Trace 硬核指南：SQL 慢在哪，从底层拉出来_ziva_5 小时前
MAC-SQL 多智能体协作框架解析山峰哥5 小时前
数据库工程与SQL调优实战：从原理到案例的深度解析丁丁点灯o6 小时前
oracle中基于正则表达式匹配规则提取子串的函数REGEXP_SUBSTR木风小助理6 小时前
Android 数据库实操指南：从 SQLite 到 Realm，不同场景精准匹配踏月的造梦星球6 小时前
浅究Oracle迁移至DM8产生数据文件膨胀的原因Knight_AL6 小时前
深入解析数据库四大事务隔离级别及其实际应用一心赚狗粮的宇叔15 小时前
中级软件开发工程师2025年度总结