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Oracle dbms_space

Oracle Database Tips by Donald Burleson

Using Oracle dbms_space

Use the Oracle procedure dbms_space.space_usage to provide the space usage ratio within each block in the Bitmap Managed Block (BMB) segments. It provides information regarding the number of blocks in a segment with the following range of free space.

Oracle9i provides several new procedures for automated space management. These include:
  • dbms_space.space_usage
  • dbms_repair.rebuild_freelists
  • Querying the DBA_TABLES view

The most important procedure in the dbms_space package is the space_usage procedure. As you may recall, you can get information directly from DBA_TABLES on block usage.

Locally managed tablespaces (LMT) and automatic segment space management (ASSM) provide a new way to manage freelists for individual objects in a database. Along with these ASSM features, Oracle9i provides several new DBMS PL/SQL packages for viewing and managing tablespaces with ASSM. These include:


Use the new dbms_space.space_usage procedure for reporting the space position in BMB segments. This procedure provides the space usage ratio within each block. It is preferred over the dbms_space.free_blocks procedure.

Use the Oracle procedure dbms_space.space_usage to provide the space usage ratio within each block in the Bitmap Managed Block (BMB) segments.



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