How can I activate the flashback feature in Oracle?

1 year ago
Olivia Parker
1 minute

To enable the flashback feature of the Oracle database, you can follow the steps below:

  1. To confirm the size of the flashback area in the database, you can use the following SQL statement to query the size of the flashback area:
SELECT flashback_on, flashback_size/1024/1024 AS "Flashback Size (MB)" FROM v$flashback_database_log;

If the size of the flashback area is 0, you need to set the size of the flashback area first.

  1. You can set the flashback area size by using the following SQL statement:
ALTER DATABASE FLASHBACK ON;
ALTER DATABASE FLASHBACK OFF;
ALTER DATABASE FLASHBACK ON;

This will set the size of the flashback region to the default value.

  1. To enable flashback feature, you can use the following SQL statement.
ALTER DATABASE FLASHBACK ON;

After executing this statement, the database will enable flashback functionality.

  1. To verify if flashback function is enabled, you can use the following SQL statement.
SELECT flashback_on FROM v$database;

If the query result is YES, it means that the flashback function has been successfully activated.

Please remember to backup the database before performing these operations to prevent any unforeseen circumstances.

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