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Initial_Extent & Next_Extent in USER_TABLES.

Posted on 2001-06-19
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Last Modified: 2008-01-09
Hi!

I got three pairs of info about Initial and Next, and all of them are different:
(1). Initial_Extent/Next_Extent in USER_TABLES
(2). Initial/Next  in the .dmp file, compress=n
(3). Initial/Next in the .dmp file, compress=y

I thought that (1) and (2) should be the same and both represent the most update setting of the tablespace. However, in some of my tables, the NEXT_EXTENT in (1) and the NEXT in (2) are different. Why?

In some of my tables, The NEXT in (2) and (3) are also different. Why? Because PCTINCREASE is NOT equal to 0?

Thanks a lot!!


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Question by:mingichu
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neval earned 20 total points
Comment Utility

If pct increase is not 0 that means you are intented to increase the next extent by =nextextent+(nextextent*pct increase) But this is not why these two comparisions have different results.


Regardless of the compress yes/no keeps the existsing structure of the tables but reestablish the structure and organize the blocks and each block will be fully optimally used, the raw migrations and raw chanins will be eliminated.

If you say compress=y then structure will be rebuild but if you say no the existing structure will be saved.

Regards.
Neval
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Author Comment

by:mingichu
Comment Utility
So, does it mean: INITIAL or NEXT shouldn't have any difference no matter compress = y or n?
Thanks again!
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Author Comment

by:mingichu
Comment Utility
So, does it mean: INITIAL or NEXT shouldn't have any difference no matter compress = y or n?
Thanks again!
0

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