[bbk4795] 第37集 第四章 Flashback Database 01

数据归档区管理员(FLASHBACK ARCHIVE ADMINISTER)

在日常管理中，可以安排一个专门人员负责数据归档区的管理.DBA分配FLASHBACK ARCHIVE ADMINISTER权限给此用户.

空间

　　TABLESPACE

权限

　　|-SELECT ANY TRANSACTION

　　|-FALASHBACK ARCHI

　　|-DBMS_FLASHBACK(PACKAGE EXECUTE PRIVES)

How Total Recall Works

History data:

• Row captured asynchronously by background processes at selft-tuned intervals(default:5 min)
• Stored compressed and partitioned
• Automatically purged per retention policy
• Partitions automatically created based on time and volume
• Unrelated partitions skipped by queries

Step Process

1、Create a new database to hold the FDA

2、With the FLASHBACK ARCHIVE ADMINISTER system privilege:Create a Flashback Data Archive,assign it to the tablespace,and specify its retention period.

CREATE FLASHBACK ARCHIVE fda1 TABLESPACE fda_tbs1 QUOTA 10M RETENTION 1 YEAR;

3、With the FLASHBACK ARCHIVE object privilege:Alter the base tables to enable archiving and assign it to a flashback archive.

ALTER TABLE HR.EMPLOYEES FLASHBACK ARCHIVE fda1;

Oracle Total Recall Scenario

Using Flashback Data Archive to access historical data:

--create the Flashback Data Archive

CREATE FLASHBACK ARCHIVE DEFAULT fla1 TABLESPACE tbs1 QUOTA 10G RETENTION 5 YEAR;

--Specify the default Flashback Data Archive

ALTER FLASHBACK ARCHIVE fla1 SET DEFAULT;

--Enable Flashback Data Archive

ALTER TABLE inventory FLASHBACK ARCHIVE;

ALTER TABLE stock_data FLASHBACK ARCHIVE;

SELECT product_number,product_name,count FROM inventory AS OF TIMESTAMP TO_TIMESTAMP('20017-01-01 00:00:00','YYYY:MM-DD HH24:MI:SS');