Recovery of the space in a file of data/tablespace in 10g

We have a tablespace of 30 GB, made up of 15 data files of 2 GB each. However, there are only 5 GB of data in the tables within this space of tables.

This occurred because the database kept growing (so the new data files have been added) until it was discovered that a single journal table occupied almost all the space. When this table was truncated, he left more space free, but "fragmented" across all 15 files given.

I'm trying to reclaim the space in the data files to be able to go back to the OS (there is no reason to keep more than 7-8GB to this tablespace).

From what I've read, the "alter table xxx move" command must relocate the tables to new segments to the 'before' of storage space, and then we should be able to delete the empty data in the end.

However, when I run this command on a test table, nothing appears to change everything.

I am running:

ALTER table AAFDTCRC move;
ALTER index RM. Regeneration of the PKAAFDTCRC;
exec dbms_stats.gather_table_stats (ownname = > 'RM', tabname = > 'AAFDTCRC', estimate_percent = > null, method_opt = > 'for all THE COLUMNS of SIZE AUTO', degree = > 6);

However, when I ask the dba_extents table, is to show the table always distributed in different data files. I use the "alter table" command incorrectly, or is the table dba_extents not up to date with new information?

Any help would be appreciated. Thank you!

user11198894 wrote:
Measure sizes might be a problem. Looks like that the previous data files use a size smaller than those created after measure. And I have naven can't able to find much information about what "alter table... move" when a tablespace has more than one data file. Maybe it does work in this situation?

You will not be able to reduce the number of files in a tablespace; so if that's your goal, you will need to create a new tablespace and move objects inside. In addition, you will not be able to avoid a performance impact, unless you use the dbms_redefinition package to move tables because the MOVE command makes the unavailable table and requires you to rebuild indexes.

There is a note that I wrote some time back - with a pointer to a helpfuil script - which gives you a few ideas of how Oracle behaves with management space with multiple files when you move objects: http://jonathanlewis.wordpress.com/2010/02/06/shrink-tablespace/

If you want to keep the same tablespace you can try something roughly like this:


Run my script to report on the current use of space
Reduce as much as possible all the files
Move objects more big are reaching the end of the files
Repeat as necessary to step 1

Concerning
Jonathan Lewis

Tags: Database

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