How To Reclaim All Space With Truncate Table
(Doc ID 1366521.1)
Last updated on DECEMBER 25, 2019
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 to 18.104.22.168 [Release 11.2]
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
Using the TRUNCATE statement provides a fast, efficient method for deleting all rows from a table or cluster. A TRUNCATE statement does not generate any undo information and it commits immediately. It is a DDL statement and cannot be rolled back. A TRUNCATE statement does not affect any structures associated with the table being truncated (constraints and triggers) or authorizations. A TRUNCATE statement also specifies whether space currently allocated for the table is returned to the containing tablespace after truncation.
In previous release 11gR1 when a truncate was executed Oracle keeps the segment associated with a table. Oracle 11gR1 does provide the DROP STORAGE and REUSE STORAGE clauses but the DROP STORAGE clause only drops extents beyond the minimum extents.
Starting with Oracle 11gR2 (22.214.171.124), a TRUNCATE statement can also specify the DROP ALL STORAGE clause to release the space currently allocated for a table to the containing tablespace.
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