Oracle-L: Re: Cache a table

From: Arup Nanda <orarup_at_hotmail.com>
Date: Tue, 21 Oct 2003 07:24:32 -0800
Message-ID: <F001.005D3DE0.20031021072432@fatcity.com>

OOPS! Fat finger it is, indeed. It should be MRU end of the LRU list, not LRU end.

Thanks for the correction, Mike.

Arup

Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, October 21, 2003 8:39 AM

> Hi,
>
> I'm sure you know this but you had some finger trouble there. Just to
> clarify it for others; Tables with the CACHE option are placed at the Most
> Recently Used end of the LRU list.
>
> Cheers,
> Mike Hately
>
> -----Original Message-----
> Sent: 21 October 2003 12:21
> To: Multiple recipients of list ORACLE-L
>
>
> Never. Altering the table to cache does not gurantee that it will be
always
> be available in the cache. It simply means the table will be placed in the
> Least recently used end of the LRU list and it will age away as time goes
> by, just like any other table.
>
> A better approach is to use KEEP pool and place teh table (and all other
> tables that are accessed frequently) there. This is particualrly true for
> datawarehouses wherethe lookup tables or small dimension tables can be
> placed in KEEP pool.
>
> Ah, come tho think about it, actually there is one situation where I will
> consider the CACHE option, when I restart the instance and want the hit
> ratio to look good :)
>
> HTH.
>
> Arup Nanda
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Tuesday, October 21, 2003 3:39 AM
>
>
> > Hi all,
> >
> > when you would consider to put a table a cache...
> >
> > rgds
> >
> > gb
>
>
>

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>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Hately, Mike (LogicaCMG)
> INET: mike.hately_at_nedl.co.uk
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Arup Nanda
  INET: orarup_at_hotmail.com

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Received on Tue Oct 21 2003 - 10:24:32 CDT