Tablespaces in the Oracle 10g Release 1 database use dictionary-managed extent management,in which the tablespace maintains a bitmap in each datafile that represents whether each data block is free or used.

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In Oracle 10g Release 1, tablespaces can use either dictionary-managed or locally managed extent management. In locally managed tablespaces, a bitmap is used to manage the free and used space within each datafile, not in dictionary-managed tablespaces. Dictionary-managed tablespaces rely on data dictionary tables to track space usage.

Tablespaces in the Oracle 10g Release 1 Database Use Dictionary-Managed