GUOB 2023 presentation. Flashbacks - beyond the Oracle Database Backups.

1. OCI – Database
Backups

2. Flashback – Oracle
Database no OCI
Indo além dos backups
Tércio Costa

3. TércioCosta
• Cloud Transf & Migration Assoc Manager
• Accenture Enkitec Group
• 12/08/2023
• Linktree:
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4. OracleCertifications • Oracle Cloud Data Management 2023 Certified Foundations Associate
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Administrator
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• Oracle Database 12c Administrator Certified Associate
• Oracle Database PL/SQL Developer Certified Professional
• Oracle Database SQL Certified Expert
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7. Oracle Database
#
Backup no OCI
7

8. Native Backup no OCI
Automatic Backups to Object Storage
You can choose schedule and backup retention
Restore:
You can choose from:
– Lastest
– Timestamp
– SCN
Manual Backups
Will NOT be deleted after database is terminated
Backup and Restore Types
8

9. 9
mv2bucket
(OCI) mv2bucket - Oracle
Managed Bucket Content
Manager (Doc ID 2723911.1)

10. 10
Oracle Database
Backup Cloud Module
Oracle Database Backup
Service - FAQ (Doc ID
1640149.1)

11. Além dos backups
Flashback
11

12. Flashback Technology
• Perform queries that return past data
• Perform queries that return metadata that shows a detailed history of changes to the database
• Recover tables or rows to a previous point in time
• Automatically track and archive transactional data changes
• Roll back a transaction and its dependent transactions while the database remains online
12

13. 13
How undo works?

14. Flashback Features
• Oracle Flashback Query
• Oracle Flashback Version Query
• Oracle Flashback Transaction Query
• Oracle Flashback Transaction
• DBMS_FLASHBACK Package
• Oracle Flashback Data Archive
• Oracle Flashback Table
• Oracle Flashback Drop
• Oracle Flashback Database
14

15. 15
Flashback Query
SELECT AS OF
Requirements:
• FLASHBACK Privilege
Example:
SELECT *
FROM employees
AS OF TIMESTAMP
TO_TIMESTAMP('2004-04-04 09:30:00', 'YYYY-MM-
DD HH:MI:SS')
WHERE last_name = 'Chung';

16. 16
Flashback Version Query
VERSIONS BETWEEN { SCN | TIMESTAMP } start
AND end
Pseudocolumns:
• VERSIONS_STARTSCN
• VERSIONS_STARTTIME
• VERSIONS_ENDSCN
• VERSIONS_ENDTIME
• VERSIONS_XID
• VERSIONS_OPERATION
Requirements:
• FLASHBACK Privilege
Example:
SELECT versions_startscn, versions_starttime,
versions_endscn, versions_endtime,
versions_xid, versions_operation,
last_name, salary
FROM employees
VERSIONS BETWEEN TIMESTAMP
TO_TIMESTAMP('2008-12-18 14:00:00', 'YYYY-
MM-DD HH24:MI:SS')
AND TO_TIMESTAMP('2008-12-18 17:00:00',
'YYYY-MM-DD HH24:MI:SS')
WHERE first_name = 'John';

17. 17
Flashback Transaction Query
View:
FLASHBACK_TRANSACTION_QUERY
Requirements:
• SUPPLEMENTAL LOG DATA;
• SUPPLEMENTAL LOG DATA (PRIMARY KEY)
• SUPPLEMENTAL LOG DATA (FOREIGN KEY)
• SELECT ANY TRANSACTION Privilege OR
FLASHBACK AND READ OR SELECT
Example:
SELECT xid, operation, start_scn, commit_scn,
logon_user, undo_sql
FROM flashback_transaction_query
WHERE xid = HEXTORAW('000200030000002D');

18. 18
DBMS_FLASHBACK
Package:
DBMS_FLASHBACK
Requirements:
• EXECUTE ON DBMS_FLASHBACK Privilege
Example:
Example(Procedures):
ENABLE_AT_TIME
ENABLE_AT_SYSTEM_CHANGE_NUMBER

19. 19
Flashback Transaction
Package:
DBMS_FLASHBACK
Requirements:
• EXECUTE ON DBMS_FLASHBACK Privilege
• ALTER DATABASE ADD SUPPLEMENTAL LOG
DATA (PRIMARY KEY) COLUMNS;
• ALTER DATABASE ADD SUPPLEMENTAL LOG
DATA (FOREIGN KEY) COLUMNS;
Example:
Example(Procedures):
• TRANSACTION_BACKOUT
Views:
• DBA_FLASHBACK_TXN_STATE
• DBA_FLASHBACK_TXN_REPORT

20. 20
Flashback Data Archive
Once the undo information is lost, the view of the past is lost also
Privileges:
• FLASHBACK ARCHIVE ADMINISTER
• CREATE FLASHBACK ARCHIVE
• ALTER FLASHBACK ARCHIVE
• DROP FLASHBACK ARCHIVE
• FLASHBACK ARCHIVE object
Package
• DBMS_FLASHBACK_ARCHIVE
Requirements:
• Name of the first tablespace of the Flashback
Data Archive
• Name of the Flashback Data Archive
• Quota (optional)
• Retention time
• Optimize
Views:
• DBA_FLASHBACK_ARCHIVE
• DBA_FLASHBACK_ARCHIVE_TS
• DBA_FLASHBACK_ARCHIVE_TABLES

21. 21
Flashback Table
Privileges:
• FLASHBACK ANY TABLE OR FLASHBACK
OBJECT
• READ or SELECT, INSERT, DELETE,
and ALTER privileges on the table
Requirements:
• ROW MOVEMENT (rowids)
Example:
FLASHBACK TABLE hr.employees TO
TIMESTAMP TO_TIMESTAMP('2013-10-17 09:30:00',
'YYYY-MM-DD HH:MI:SS');
Can flashback to time, scn and restore point.
Flashback the entire table

22. 22
Flashback Drop
Database parameter: recyclebin.
Do not use UNDO!
The table is only renamed on drop!
Privileges:
• DROP
• READ or SELECT and FLASHBACK
Requirements:
• ALTER SYSTEM SET RECYCLEBIN='on'
SCOPE=SPFILE;
Example:
RESTORE TABLE HR.EMPLOYEES TO BEFORE
DROP;
Views:
• RECYCLEBIN
• USER_RECYCLEBIN
• DBA_RECYCLEBIN
• (SHOW RECYCLEBIN)
Restore a dropped table

23. 23
Flashback Database
Use Flashback logs
Offline operation
Privileges:
• SYSDBA, SYSBACKUP OR SYSDG
View:
• V$FLASHBACK_DATABASE_LOG
Requirements:
• FRA Configured (OMF)
• ARCHIVELOG
• ALTER DATABASE FLASHBACK ON;
Parameter:
• DB_FLASHBACK_RETENTION_TARGET
Flashback the entire database!

24. Flashback Features per Edition
24
SE2 EE EE-ES DBCS SE DBCS EE DBCS EE-HP DBCS EE-EP ExaCS/CC AT
Flashback Query Y Y Y Y Y Y Y Y Y
Flashback Version Query Y Y Y Y Y Y Y Y Y
Flashback Transaction Query N Y Y N Y Y Y Y Y
Flashback Transaction N Y Y N Y Y Y Y N
DBMS_FLASHBACK N Y Y N Y Y Y Y Y
Flashback Data Archive Y Y Y Y Y Y Y Y N
Flashback Table N Y Y N Y Y Y Y Y
Flashback Drop Y Y Y N Y Y Y Y Y
Flashback Database N Y Y N Y Y Y Y N
SE2: Standard Edition 2, EE: Enterprise Edition, EE-ES: Enterprise Edition on Engineered Systems, DBCS: Database Cloud Service, EE-HP: Enterprise Edition - High
Performance, EE-EP - Enterprise Edition - Extreme Performance, ExaCS: Database Exadata Cloud Service, CC: Cloud@Customer, AT: Autonomous

25. 25
Best Pratices
• UNDO RETENTION
• UNDO TABLESPACE SIZE
• ADD SUPPLEMENTAL LOG DATA AT LEAST
• DOT NOT USE TRIGGERS FOR LOG. USE FLASHBACK DATA ARCHIVE!
• CREATE YOUR OWN INDICES ON FLASBACK DATA ARCHIVE BASE TABLES
• ENABLE RECYCLEBIN
• ENABLE FLASHBACK DATABASE

26. 26
FLASHBACK <> DBPITR
• Media recovery
• Time
• Logical <> Physical
• Redo, Undo and Flashback logs <> backupsets and image copies

27. ?
27

28. Thank You