Data files AutoExtend configuration In Oracle

Hi,

I have some data files with the AutoExtend feature set ON, but i want to know when it extends how much space it
requires when extending ?
 
Also i want to increase the space it extends.    Let say for example when the data file extends it takes 500MB and i want it to take less/more space, how to do that ?

Thanks.
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joe_echavarriaDatabase AdministratorAsked:
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johnsoneSenior Oracle DBACommented:
DBA_DATA_FILES is the place to go to determine autoextend values.  Look at AUTOEXTENSIBLE, MAXBYTES, MAXBLOCKS and INCREMENT_BY.  INCREMENT_BY should tell you the size of the next autoextend.

To change the next extent, you would need to use ALTER DATABASE.  Something like:

ALTER DATABASE
DATAFILE '<full_path_to_file>'
AUTOEXTEND ON NEXT 500M;

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slightwv (䄆 Netminder) Commented:
>>how much space it  requires when extending ?

Look at INCREMENT_BY in DBA_DATA_FILES:
http://docs.oracle.com/cd/E11882_01/server.112/e40402/statviews_3143.htm#REFRN23049

It is in blocks.  multiply it by the tablespaces block size to get bytes.

>> want it to take less/more space, how to do that ?

Alter the datafile.  

This is untested syntax.  The online docs should have the correct syntax if I missed something:

ALTER DATABASE DATAFILE '/somedatafile.dbf' NEXT 500MB;
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