Solved

Initial_Extent & Next_Extent in USER_TABLES.

Posted on 2001-06-19
3
840 Views
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!!


0
Comment
Question by:mingichu
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 

Accepted Solution

by:
neval earned 20 total points
ID: 6207933

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
0
 

Author Comment

by:mingichu
ID: 6208364
So, does it mean: INITIAL or NEXT shouldn't have any difference no matter compress = y or n?
Thanks again!
0
 

Author Comment

by:mingichu
ID: 6208365
So, does it mean: INITIAL or NEXT shouldn't have any difference no matter compress = y or n?
Thanks again!
0

Featured Post

Enroll in May's Course of the Month

May’s Course of the Month is now available! Experts Exchange’s Premium Members and Team Accounts have access to a complimentary course each month as part of their membership—an extra way to increase training and boost professional development.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Configuring and using Oracle Database Gateway for ODBC Introduction First, a brief summary of what a Database Gateway is.  A Gateway is a set of driver agents and configurations that allow an Oracle database to communicate with other platforms…
When it comes to protecting Oracle Database servers and systems, there are a ton of myths out there. Here are the most common.
This video shows how to Export data from an Oracle database using the Datapump Export Utility.  The corresponding Datapump Import utility is also discussed and demonstrated.
This video shows how to configure and send email from and Oracle database using both UTL_SMTP and UTL_MAIL, as well as comparing UTL_SMTP to a manual SMTP conversation with a mail server.

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question