Re: reducing LIO's

[ Try this again S-]

Do you have a version of the query that uses table aliases so we can see which columns come from which tables? What indexes are on the tables?

There's a lot of discussion of IOTs which I'm a big fan of in the appropriate setting. IOTs would (probably) only be advisable if the ORDT_STS and/or ORDM_STS are part of the primary key. A lot of time these sorts of "flag" columns aren't part of the PK. List partitioning might be a better choice if that's the case. If they are part of the PK, swap them to the front of the PK should you try the IOT route.

> On Thu, 31 Mar 2005, The Human Fly wrote:
>
> > Here is the query and its execution plan,
> >
> > Buffer Gets Executions Gets per Exec %Total Time (s) Time (s) Hash Value
> > --------------- ------------ -------------- ------ -------- --------- ----------
> > 18,305,779 1,771 10,336.4 9.4 176.37 251.04 2163204450
> > Module: JDBC Thin Client
> > BEGIN PROC_APP_OW_ORD(); END;
> >
> > 18,168,431 1,768 10,276.3 9.3 170.39 240.53 3569511138
> > Module: JDBC Thin Client
> > SELECT ORDT_APPR_DT, ORDT_ORD_NB, ORDT_TRN_NB, ORDT_MKT_ID , ORDT_STS,
> > ORDM_STS, ORDT_EXCH_ID, ORDM_SUB_ID, ORDM_ORDT_NB
> > FROM ORDT,ORDM
> > WHERE ORDM_ORD_NB=ORDT_ORD_NB
> > AND ORDT_STS='K' AND ORDM_STS IN ('C','G','L')
> > ORDER BY ORDT_APPR_DT,ORDT_ORD_NB

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Stephen Rospo        Principal Software Architect
Vallent Corporation (formerly Watchmark-Comnitel)
Stephen.Rospo_at_vallent.com           (425)564-8145

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