What is Flashback data archive?

A flashback data archive consists of multiple tablespaces and stores historic data from all transactions against tracked tables. The data is stored in internal history tables. Flashback data archives retain historical data for the time duration specified using the RETENTION parameter.

How do I get rid of Flashback archive?

Use the DROP FLASHBACK ARCHIVE clause to remove a flashback data archive from the system. This statement removes the flashback data archive and all the historical data in it, but does not drop the tablespaces that were used by the flashback data archive.

What is Flashback Technology in Oracle?

Oracle Database Flashback Technologies are a unique and rich set of data recovery solutions that enable reversing human errors by selectively and efficiently undoing the effects of a mistake. Before Flashback, it might take minutes to damage a database but hours to recover it.

How to use Flashback in Oracle 12c?

How to Enable Oracle 12c Flashback Database

1. Shut down the database and start up the database in mount mode in SQL*Plus:
2. Confirm that the database is in ARCHIVELOG mode, which is required for Flashback Database, and enable ARCHIVELOG mode if needed.
3. Set the flashback retention target to the desired value (in minutes).

Which of the following is an advantage of Oracle Database?

Explanation: The following are the advantages of an Oracle database: Performance: Oracle has procedures and principles that help us to get high levels of database performance. Portability: The Oracle database can be ported on all different platforms than any of its competitors.

Which SQL statement from the following is used to create a new tablespace?

To create a new tablespace, use the SQL statement CREATE TABLESPACE or CREATE TEMPORARY TABLESPACE . You must have the CREATE TABLESPACE system privilege to create a tablespace. Later, you can use the ALTER TABLESPACE or ALTER DATABASE statements to alter the tablespace.

How do I enable flashback tables?

To flash back a table to a restore point, you must have the SELECT ANY DICTIONARY or FLASHBACK ANY TABLE system privilege or the SELECT_CATALOG_ROLE role. To flash back a table to before a DROP TABLE operation, you need only the privileges necessary to drop the table.

How does Oracle Flashback Database work?

Use the FLASHBACK DATABASE command to rewind the database to a target time, SCN, or log sequence number. This command works by undoing changes made by Oracle Database to the data files that exist when you run the command. Flashback can fix logical failures, but not physical failures.

What is the disadvantage of Oracle Database?

Complexity One of the biggest disadvantages of Oracle Database is its complexity. It is not preferable to use Oracle, especially when the users are not technically sound and lack the technical ability that is needed in order to work with the Oracle Database.

What is Oracle default tablespace?

Default tablespaces in Oracle Oracle comes with the following default tablespaces: SYSTEM , SYSAUX , USERS , UNDOTBS1 , and TEMP . The SYSTEM and SYSAUX tablespaces store system-generated objects such as data dictionary tables. And you should not store any object in these tablespaces.

What is Flashback command in SQL?

Purpose. Use the FLASHBACK TABLE statement to restore an earlier state of a table in the event of human or application error. The time in the past to which the table can be flashed back is dependent on the amount of undo data in the system.

How do I create a flashback Data Archive?

Use the CREATE FLASHBACK ARCHIVE statement to create a flashback data archive, which provides the ability to automatically track and archive transactional data changes to specified database objects. A flashback data archive consists of multiple tablespaces and stores historic data from all transactions against tracked tables.

Why do I get a null error in the flashback archive?

c. if you attempt to read data before any changes have been made and written to the flashback archive, you get a null error. Adjust the time period specified in the versions above. d. there is a slight delay between modifying the table and seeing it in the flashback data archive.

What is flashback Data Archive in Salesforce?

Flashback data archives retain historical data for the time duration specified using the RETENTION parameter. Historical data can be queried using the Flashback Query AS OF clause. Archived historic data that has aged beyond the specified retention period is automatically purged.

How do I create a flashback in SQL Server?

Use the CREATE FLASHBACK ARCHIVE statement to create a flashback archive, which provides the ability to automatically track and archive transactional data changes to specified database objects. A flashback archive consists of multiple tablespaces and stores historic data from all transactions against tracked tables.