Comments on: Is TRUNCATE TABLE t same as DELETE FROM t? http://oraqa.com/2006/02/23/is-truncate-table-t-same-as-delete-from-t/ Oracle Question and Answer Mon, 19 Dec 2011 14:21:07 -0700 http://wordpress.org/?v=2.8.4 hourly 1 By: Karl Reitschuster http://oraqa.com/2006/02/23/is-truncate-table-t-same-as-delete-from-t/comment-page-1/#comment-146 Karl Reitschuster Fri, 24 Feb 2006 08:06:53 +0000 http://oraqa.com/2006/02/23/is-truncate-table-t-same-as-delete-from-t/#comment-146 Hi Eddie thanks for posting; i would like to be stronger in my statements : Truncate: *is* faster than removing all rows with the DELETE statement Delete: *is* slower than removing all rows with the TRUNCATE statement Additionally Delete ( the whole table ) causes a lot of IO on INDEX Segments, UNDO Blocks and Redo logs. If you truncate a table and know that you will fill it again with almost the same amount of data there is a TRUNCATE TABLE [TABLE_NAME] REUSE STORAGE. All Extents remain allocated - a load of may rows is faster then. Greetings Karl Hi Eddie thanks for posting;
i would like to be stronger in my statements :

Truncate:
*is* faster than removing all rows with the DELETE statement

Delete:
*is* slower than removing all rows with the TRUNCATE statement

Additionally
Delete ( the whole table ) causes a lot of IO on INDEX Segments, UNDO Blocks and Redo logs.

If you truncate a table and know that you will fill it again with almost the same amount of data
there is a TRUNCATE TABLE [TABLE_NAME] REUSE STORAGE. All Extents remain allocated – a load of may rows is faster then.

Greetings
Karl

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