One good feature flashback of oracle 10g
1. use database as archive log mode and set archive dest location
alter system set LOG_ARCHIVE_DEST_1 = 'LOCATION=/u04/arch/orcl' scope=spfile;
2. configuration retention days/size/distination
ALTER SYSTEM SET DB_FLASHBACK_RETENTION_TARGET=43200; --30 days
ALTER SYSTEM SET db_recovery_file_dest_size=10g SCOPE=BOTH;
ALTER SYSTEM SET db_recovery_file_dest='/u04/flash_recovery_area/orcl' SCOPE=BOTH;
3. enalbe database flashback
ALTER DATABASE FLASHBACK ON;
4. create restore pint
CREATE RESTORE POINT before_upgrade GUARANTEE FLASHBACK DATABASE;
SELECT NAME, SCN, TIME, DATABASE_INCARNATION#,GUARANTEE_FLASHBACK_DATABASE,STORAGE_SIZE from V$RESTORE_POINT;
DROP RESTORE POINT BEFORE_UPGRADE;
5. do some changes.
6. rollback database to restore point
SHUTDOWN IMMEDIATE;
STARTUP MOUNT;
FLASHBACK DATABASE TO RESTORE POINT 'BEFORE_UPGRADE';
ALTER DATABASE OPEN RESETLOGS;
7. Clear space for flashback database
You can disable Flashback Database with the ALTER DATABASE FLASHBACK OFF command.
As a consequence, all existing Flashback Database logs are deleted automatically.
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1) 基本结构
BEGIN
... --语句
EXCEPTION -- 例外处理
WHEN ...
...
WHEN OTHERS
...
END;
2) 常用预定义例外
EXCEPTION
WHEN CU ......
使用EXP
EXP命令行选项
1,BUFFER
该选项用于指定提取行数据时的缓冲区尺寸.通过设置该选项,可以确定导出时数据提起尺寸.该选项只适用于常规选项.
Exp scott/tiger tables=dept,emp file=a.dmp buffer=81920
2,COMPRESS
该选项用于指定导入管理初始区(INITIAL)的方法.默认值为Y.当设置该选项为Y时,oracle会� ......
权限(Privilege)是指执行特定类型SQL命令或访问其他方案对象的权利,权限包括系统权限和对象权限两种类型.系统权限(System Privilege)是指执行特定类型SQL命令的权利,它用于控制用户可以执行的一个或一组数据库操作.常用的系统权限:
CREATE SESSION 连接到数据库
CREATE TABLE 建表
CREATE VIEW 建立视图
CREATE PUBLI ......
server A: 10.85.10.44 SID=orcl
target server B: 10.85.10.43
oracle version:10.2.0.1
OS platform : windows XP
Data Guard默认是maximize performance， 可以用以下语句来进行模式间的切换。
ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE {PROTECTION | AV ......
