Can I use shrink for an asset (perform insert very-delete operations) table

Hello guys,.

I have a very simple question. According to an article (link: http://www.dba-oracle.com/t_automatic_segment_space_management.htm) the following quote is written

Beware:  Using ASSM can hinder database DML performance, and most Oracle experts will use manual freelists and freelist groups.  Click here for details on automatic segment space management internals.

Using automatic segment space management is great for almost all Oracle applications, with the exception being super-high update tablespaces, which would use traditional freelists with multiple freelist groups.

I just want to use shrink my table in order to reclaim the unused space. However, I play a lot insert and delete operations on the table (not update, insert and delete). So, I wonder, if I use shrink, my table will affect seriously? Because I insert and remove thousands of rows in this table every day.

And my second question is how can I know that my table is in SAMS (automatic segment space management) to use retractable? Because I was told that my table shoul be in SAMS to use retractable?

select * from v$version;

Oracle Database 11 g Enterprise Edition Release 11.2.0.1.0 - 64 bit Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE 11.2.0.1.0 Production."
AMT for 64-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

best regards
Charlie

970992 wrote:
I just want to use shrink my table in order to reclaim the unused space.

Ok. You are sure that there is some unused space and that Oracle will not reuse space automatically? If you are constantly inserting and removing a table, unless you remove constantly more data that you insert or you use direct-path inserts to prevent Oracle to reuse the space freed by deletions, there is no reason to believe that there is unused space in the table.

However, I play a lot insert and delete operations on the table (not update, insert and delete). So, I wonder, if I use shrink, my table will affect seriously? Because I insert and remove thousands of rows in this table every day.

Thousands of lines is enough little activity.

If you want to shrink the table, you generally want to do while there is little or no activity on the table since you will need to at least briefly to acquire a lock on the table. If you do only a few thousand a day race DML operations, it shouldn't be difficult to find a window where the shrink will not be a significant impact on DML.

But, back to my first point, I would tend to wait that you don't need to shrink the table in the first place.

And my second question is how can I know that my table is in SAMS (automatic segment space management) to use retractable? Because I was told that my table shoul be in SAMS to use retractable?

Assuming that you know what the table tablespace is in

SELECT segment_space_management
  FROM dba_tablespaces
 WHERE tablespace_name = <>

Justin

Tags: Database

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