What is undo retention guarantee?
When automatic undo management is enabled, there is always a current undo retention period, which is the minimum amount of time that oracle database attempts to retain old undo information before overwriting it. When available space for new transactions becomes short, the database begins to overwrite expired undo.Click to see full answer. Moreover, how do…
When automatic undo management is enabled, there is always a current undo retention period, which is the minimum amount of time that oracle database attempts to retain old undo information before overwriting it. When available space for new transactions becomes short, the database begins to overwrite expired undo.Click to see full answer. Moreover, how do I turn on undo retention guarantee?You enable retention guarantee by specifying the RETENTION GUARANTEE clause for the undo tablespace when you create it with either the CREATE DATABASE or CREATE UNDO TABLESPACE statement. Or, you can later specify this clause in an ALTER TABLESPACE statement.Additionally, how do I undo a Undo tablespace? Drop Unused UNDO Tablespace First, get a list of all the datafile for your UNDO tablespace. select file_name from dba_data_files where tablespace_name = ‘UNDOTBS’; Next, drop those data files one by one using alter tablespace drop datafile command as shown below. Now, drop the UNDO tablespace. One may also ask, how do you increase undo retention? To set the undo retention period: Set undo_retention in the initialization parameter file. Undo_retention = 1800. Change undo_retention at any time using the alter system statement: Alter system set undo_retention = 2400; What is undo in Oracle?Oracle Database creates and manages information that is used to roll back, or undo, changes to the database. Such information consists of records of the actions of transactions, primarily before they are committed. These records are collectively referred to as undo.
