Re: Generic "Can I extend?" check

Hi Connor,

You are a clever boy !!

Quick question, where did you get these figures, are they documented somewhere or was it play and tell ?

Cheers

Richard

Connor McDonald wrote:
>
> I've been asked to write a generic routine to determine if a segment can
> extend. Easy enough except for auto-alloc lmt's where 'next_extent' is
> null (ie indeterminate) in xxx_SEGMENTS.
>
> So here is my current compromise (in pseudo-code)
>
> where nvl(next_extent,
> case
> when initial_extent < 1m then
> case when extents < 16 then next = 64k,
> when extents < 80 then next = 1m,
> when extents < 200 then next = 8m,
> else next = 64m
> when initial_extent >= 1m then
> case when extents < 64 then next = 1m,
> when extents < 184 then next = 8m,
> else next = 64m )
> > largest_free_space_chunk_in_tablespace
>
> The rough translation being:
> - auto-alloc extents are 16x64k, then 64x1m, then 120x8m, then 64m, when
> the initial_extent is less than 1m
> - auto-alloc extents are 64x1m, then 120x8m, then 64m, when the
> initial_extent is equal/more than 1m
>
> In the spirit of "open source", I'm throwing this out the community
> asking for counter-examples which break the above formula.
>
> Thanks
> Connor
>
> --
> ==============================
> Connor McDonald
>
> http://www.oracledba.co.uk
>
> "Some days you're the pigeon, some days you're the statue..."