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Imagine you re running a very long batch job and it runs out of space for some reason, whether because of an unexpected amount of data or because of a failure to notice that the space was running out for the objects involved in the DML transactions. Or perhaps there was a maximum number of extents reached error. What are your options when this sort of thing happens (as it inevitably will) Most of the time, you must correct the space problem or other condition that caused the error in the first place, and then restart your transactions. More often than not, you will roll back the whole operation, which will take quite a bit of time. Sometimes you have to restart at the very beginning of the program, which is a waste of time. In any case, your actions as a DBA are limited to playing catchup after the fact to rectify the error and redo the operation. Oracle s Resumable Space Allocation feature will suspend database operations that run into problems due to lack of space, and it restarts those operations automatically when the space problems are fixed. The Resumable Space Allocation

feature comes in handy when you re trying to ensure that key batch jobs or data loads run within the window of operation they are allotted when they encounter space-related issues.

To take full advantage of the Resumable Space Allocation feature, you should use locally managed tablespaces coupled with Automatic Undo Management.

You can explicitly make operations run in the Resumable Space Allocation mode by using the ALTER SESSION command. The Resumable Space Allocation feature will just suspend operations until the problem is fixed (such as by your adding a datafile to extend space) and it will resume automatically after that.

The following types of database operations are resumable: Queries: These operations can always be resumed after they run out of temporary sorting space. DML operations: Insert, update, and delete operations can be resumed after an error is issued. DDL operations: Index operations involving creating, rebuilding, and altering are resumable, as are CREATE TABLE AS SELECT operations and several other DDL operations. Import and export operations: SQL*Loader data load jobs that run out of space are resumable. You must use the RESUMABLE parameter when you specify the SQL*Loader job, to make the operation resumable. Two other resumable operation parameters, RESUMABLE_TIMEOUT and RESUMABLE_NAME, can be set only if you set the RESUMABLE parameter.

You can resume operations after fixing any of the following types of errors during the execution of any operation: Out of space errors: Typically, operations fail when you can t add extents to your tables or indexes because the tablespace is full. You need to add a datafile to your tablespace to enable the objects to throw a new extent and continue to grow. The typical error message is ORA01653. Maximum extents errors: When a table or a rollback segment reaches the maximum extents specified, it can t grow any further, even if you have space in the tablespace. You end up with errors such as ORA-01628. User s space quota errors: If the user s quota on a tablespace is exceeded, your operations on that tablespace will come to a halt. The typical Oracle error is ORA-01536.

To use the Resumable Space Allocation feature, a user must have the appropriate privileges: SQL> GRANT RESUMABLE TO salapati; Grant succeeded. SQL>

When you wish to revoke the privilege, use the following command: SQL> REVOKE RESUMABLE FROM salapati; Revoke succeeded. SQL> You can enable a session for Resumable Space Allocation in one of two ways set the resumable_timeout initialization parameter, or use the ALTER SESSION command to enable and disable resumable space allocation. The following sections discuss these methods.