Re: Read Ahead Pages, etc.
Art S. Kagel schrieb:
>
> Dianne Pendleton wrote:
[snip]
> or (ixda-RA + idx-RA + da-RA) - RA-pgsused ~ 0
>
> If the second result is positive then your RA parameters are set too
> high. Obviously small positive values are just fine but a large
> descrepancy (more than a few percent of RA-pgsused) should be avoided
> as wasting resources and forcing buffers to thrash (reduced read
> cache%).
>
> I've never seen this calculation go negative
...[snip]
------------------------------------->^^^^^^^^
unless someone has typed an 'onstat -z' !!!!!
hth
martin