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How do you undo a tablespace?
Using CREATE DATABASE to Create an Undo Tablespace You can create a specific undo tablespace using the UNDO TABLESPACE clause of the CREATE DATABASE statement. The following statement illustrates using the UNDO TABLESPACE clause in a CREATE DATABASE statement.
How do I undo the default tablespace?
Create a new undo tablespace of the same size (larger or smaller) depending on your database requirements. sql> alter system set undo_tablespace = undotbs2 scope=both; 5. Check the status of the undo segments and determine if all the segments in the old undo tablespace are offline.
How do I know if undo tablespace is Autoextend?
select TABLESPACE_NAME, FILE_NAME,AUTOEXTENSIBLE,MAXBYTES from dba_Data_files where TABLESPACE_NAME like ‘TS__’ ; Check the values in AUTOEXTENSIBLE column; if it’s NO this feature is not enabled on the file in column FILE_NAME.
When to drop undo tablespace in Oracle Database?
In case of a dead transaction, you will have to wait until the recovery is done. If the Undo Segment status is ‘ NEEDS RECOVERY ‘, please refer the post below to recover the Undo segment. 4. If all the Undo segments in the tablespace to the dropped is of status OFFLINE, then drop the tablespace.
Is there a way to shrink the undo tablespace?
If you need disk space you can try shrinking the undo tablespace, but that might not work. You can also get downtime to shutdown the database, bring up the database in restrict mode, then drop the old undo tablespace, that shutdown and startup the database unrestricted.
When does an offline undo tablespace go offline?
A PENDING OFFLINE undo tablespace cannot be used by another instance, nor can it be dropped. Eventually, after all active transactions have committed, the undo tablespace automatically goes from the PENDING OFFLINE mode to the OFFLINE mode.
How to create a new undo table in SQL?
1. Check the existing UNDO details: 2. Create a new undo tablespace: SQL> create undo tablespace UNDOTBS_NEW datafile ‘/archive/NONPLUG/NONCDB/PLUG/undo_new01.dbf’ size 1g; Tablespace created. 3. Update undo_tablespace parameter SQL> alter system set undo_tablespace=UNDOTBS_NEW scope=both; System altered.