How do I undo a Datafile in Oracle?

How do I undo a Datafile in Oracle?

How to Drop Undo Tablespace in Oracle Database

1. check whether the Undo tablespace to be dropped is the default Undo tablespace:
2. If the UNDO_TABLESPACE is set to the one to be dropped, create a new Undo tablespace and switch to the new one.
3. Check the status of the Undo segments in the Undo tablespace to be dropped.

Can we rename datafile in Oracle?

You can rename and relocate datafiles in one or more tablespaces using the ALTER DATABASE RENAME FILE statement. This method is the only choice if you want to rename or relocate datafiles of several tablespaces in one operation. You must have the ALTER DATABASE system privilege.

How do I rename an undo tablespace?

How to Switch to a New Undo Tablespace in Oracle Database

1. Check your current default Undo tablespace:
2. Determine the size of the datafile(s) for your current undo tablespace:
3. Create a new undo tablespace of the same size (larger or smaller) depending on your database requirements.
4. Switch to the new Undo tablespace.

How do I undo a Datafile in ASM?

By default it is NO GURANTEE state.

1. Parameter.
2. Create undo tablespace in database.
3. Add datafile in undo tablespace.
4. Drop the undo tablespace.
5. Switch undo tablespace.
6. Check the guarantee minimum threshold is maintained or not for undo tablespace.
7. Make undo TABLESPACE to GURANTEE mode.
8. Default is no guarantee mode.

What happens if undo tablespace is full?

The UNDO tablespace works as follows: * The UNDO records are not deleted when they are expired. They stay and are overwritten only when a new UNDO record needs to be written and there is no free space. Thus, it is normal for UNDOTBS1 to appear at 99% full.

How do I turn on undo retention guarantee?

Setting the Undo Retention Period

1. Set UNDO_RETENTION in the initialization parameter file. UNDO_RETENTION = 1800.
2. Change UNDO_RETENTION at any time using the ALTER SYSTEM statement: ALTER SYSTEM SET UNDO_RETENTION = 2400;

How do I rename a datafile in standby database?

If you want to rename a data file on a standby database, you need to do it manually:

1. Cancel the Data Guard recovery (set dg_broker_start to false and restart the database in mount status if you use data guard).
2. Set the standby file management to manual alter system set standby_file_management=manual.

How do I delete datafile?

You use the DROP DATAFILE and DROP TEMPFILE clauses of the ALTER TABLESPACE command to drop a single datafile or tempfile. The datafile must be empty. (A datafile is considered to be empty when no extents remain allocated from it.)

Can we rename tablespace name in Oracle?

Using the RENAME TO clause of the ALTER TABLESPACE , you can rename a permanent or temporary tablespace. For example, the following statement renames the users tablespace: If the tablespace being renamed is the SYSTEM tablespace or the SYSAUX tablespace, then it will not be renamed and an error is raised.

Can we rename tablespace in Oracle?

Renaming permanent and temporary tablespaces is now allowed in Oracle 10g (except for SYSTEM and SYSAUX) using the following command. ALTER TABLESPACE ts_current_name RENAME TO ts_new_name; The tablespace and all it’s datafiles must be online and the database must have a COMPATIBLE setting of 10.0. 0 or greater.

How do I increase undo in datafile?

How to Resize the Undo Tablespace in Oracle Database

1. This post provides the steps to resize the Undo tablespace.ie, to add space or shrink the current Undo tablespace.
2. SQL> create undo tablespace UNDOTBS2 datafile ‘D:\ORACLE\PRODUCT\11.2.
3. SQL> ALTER SYSTEM SET UNDO_TABLESPACE = UNDOTBS2 SCOPE=BOTH;

How do I add a datafile to undo tablespace?

The following example adds another datafile to undo tablespace undotbs_01: ALTER TABLESPACE undotbs_01 ADD DATAFILE ‘/u01/oracle/rbdb1/undo0102. dbf’ AUTOEXTEND ON NEXT 1M MAXSIZE UNLIMITED; You can use the ALTER DATABASE…

How do I move or rename a datafile in Oracle?

To move or rename a datafile do the following. Shutdown the database. Rename the physical file on the OS. Start the database in mount mode. Issue the ALTER DATABASE RENAME FILE command to rename the file within the Oracle dictionary. Open the database. The following SQL*Plus output shows how this is done.

Is it possible to rename a datafile while the database is online?

For tablespaces other than the SYSTEM tablespace, you can move the datafiles while the database is online, provided you take the relevant tablespace offline during the rename operation. ALTER TABLESPACE tablespace-name OFFLINE NORMAL; — Move/Rename the physical file.

How do I rename datafiles in a single tablespace?

To rename datafiles in a single tablespace, complete the following steps: Take the tablespace that contains the datafiles offline. The database must be open. Rename the datafiles using the operating system. Use the ALTER TABLESPACE statement with the RENAME DATAFILE clause to change the filenames within the database.

How do I rename a file in Oracle Dictionary?

Start the database in mount mode. Issue the ALTER DATABASE RENAME FILE command to rename the file within the Oracle dictionary. Open the database. The following SQL*Plus output shows how this is done. SQL> SHUTDOWN IMMEDIATE Database closed. Database dismounted.