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Setting Up AUM
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To enable the automatic management of your undo space, you first need to specify the automatic undo mode in the init.ora file or your SPFILE. Second, you need to create a dedicated tablespace to hold the undo information. This will guarantee that you don t end up storing the undo information in the System tablespace, which isn t a great idea. You also must choose an interval for undo retention. If you want to choose AUM when you create a new database, you need to configure the following three initialization parameters: UNDO_MANAGEMENT UNDO_TABLESPACE UNDO_RETENTION
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The UNDO_MANAGEMENT Parameter
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You specify AUM in your initialization parameter file by adding the following line: UNDO_MANAGEMENT = auto This is the only mandatory parameter for setting up AUM. When you use the value AUTO for the UNDO_MANAGEMENT initialization parameter, the database will start in the automatic undo management mode. (The default for undo management in Oracle Database 10g is still the manual mode, which is the older method of utilizing rollback segments to store undo data.)
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Use the Database Resource Manager to set up undo quotas for users, if you think any users are monopolizing undo tablespace usage.
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The UNDO_TABLESPACE Parameter
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The UNDO_TABLESPACE parameter isn t mandatory if you only have a single undo tablespace, you don t have to specify this parameter in your initialization parameter file, because Oracle will use the one available undo tablespace automatically. If you specify AUM and don t have an undo tablespace in your database at all, Oracle will be forced to use the System tablespace (the System rollback segment, to be more specific) for storing the undo data. You should avoid using the System tablespace
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CHAPTER 6 ORACLE TRANSACTION MANAGEMENT
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for storing the undo data, since that tablespace also stores the data dictionary, and you don t want to use up space there and cause problems such as fragmentation. Note that you can t create application tables and indexes in an undo tablespace, since it s exclusively reserved for undo data.
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Note
If you use the Database Configuration Assistant (DBCA) to create your databases, or choose the creation of the default database when you install Oracle Database 10g, Oracle will use AUM by default. This is contrary to what happens when you manually create a new database; in that case the default mode for undo management is MANUAL, which means you have to manage undo data using rollback segments.
If you have multiple undo tablespaces in your database, however, you must specify which undo tablespace you want the database to use, by specifying the UNDO_TABLESPACE parameter in the initialization parameter file. You can have multiple tablespaces in your database, but only one of them can be active at any given time. You activate an undo tablespace by using the ALTER SYSTEM SET UNDO_TABLESPACE command, which you ll see shortly. You create an undo tablespace when you create your database. The following database creation statement shows how to create the undo tablespace during database creation: SQL> CREATE DATABASE cust_prod ... UNDO TABLESPACE undotbs_01 datafile DATAFILE '/u10/orcl/oradata/undotbs01_01.dbf' size 750M; ...
Note
I also explain the creation of the undo tablespace in 9, which deals with creating an Oracle database.
You may choose not to create the undo tablespace when you create a new database, and even if you create an undo tablespace at database creation time, you may choose to add another undo tablespace later on. Creating an undo tablespace is like creating any other tablespace, except that you use the keyword UNDO in the CREATE TABLESPACE statement. To create an undo tablespace by itself, in an existing database, use this statement: SQL> CREATE UNDO TABLESPACE undotbs_02 DATAFILE 'c:\oracle10g\oradata\finance\undotbs01_01.dbf' SIZE 500M; Tablespace created. SQL> You can add space to an existing undo tablespace by using the ALTER TABLESPACE statement, as shown here: SQL> ALTER TABLESPACE undotbs_01 ADD DATAFILE '/u09/oradata/test/undo01dbf' 500M; You can create several undo tablespaces for your database, but the instance can only use a single undo tablespace at any given time. Let s say you are using the undo tablespace undotbs_01 as your current undo tablespace. The following ALTER SYSTEM SQL statement will dynamically change the undo tablespace for your database: SQL> ALTER SYSTEM SET UNDO_TABLESPACE = undotbs_02;
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