Re: LMTs

On Mon, Mar 10, 2008 at 2:30 PM, Joe Smith <joe_dba_at_hotmail.com> wrote:

> CREATE TABLESPACE data
> DATAFILE '/FS/data_s01.dbf' size 2000m autoextend on next 1m maxsize
> 12000m,
> '/FS/data_s02.dbf' size 2000m autoextend on next 1m maxsize
> 12000m
> EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M
> SEGMENT SPACE MANAGEMENT AUTO;
>
> How do you control the size of LMTs.
>
> If I remove the "autoextend on next 1m" I can't use the "maxsize" keyword.
>
> How do I restrict the size of the datafiles for LMTs
>

Hey Joe (always wanted to say that sorry)

You have a choice. Either you want the datafiles to grow as needed and limit the total size to which they can grow - i.e to be autoextensible - in which case it makes sense that you need both the amount by which to grow each time and the absolute limit. Alternatively you know how big you want them to be and you just specify the fixed size for the datafile (no autoextension at all).

I happen to prefer the latter - not least because it then becomes easy to tell when you are running out of space in a tablespace (how much free space is left), whereas when the datafiles are autoextensible it's very easily to miscalculate how full a tablespace is. I also like to change control space operations because they have an impact on clones, backups dataguard space requirements and so on. If you do prefer to let Oracle handle the growth then I'd suggest a rather larger next size than 1m. Once you get to 2gb of data every time you add 1mb more data you'll be growing the datafile which is a lot of growth operations. You'll also likely cause more filesystem fragmentation - though you might not care about that.

>
> --
> Niall Litchfield
> Oracle DBA
> http://www.orawin.info
>

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