Re: Performance - Chained Rows

Hi,

Analyze the table and check for the chain_cnt in dba_tables.

Good luck.

• Original Message ----- From: "Weerd Kirsten, E.C. de" <Kirsten.deWeerd_at_Oranjewoud.nl> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Thursday, October 12, 2000 02:05 AM Subject: RE: Performance - Chained Rows

> Chuck,
>
> How can I determine if these are chained or migrated rows ???
>
> Greets,
>
> Kirsten
>
> > -----Original Message-----
> > From: Chuck Hamilton [SMTP:chuck_hamilton_at_yahoo.com]
> > Sent: Tuesday, October 10, 2000 7:20 PM
> > To: Multiple recipients of list ORACLE-L
> > Subject: Re: Performance - Chained Rows
> >
> > Absolutely. You first need to determine whether these are true chained
> > rows or migrated rows. Both show up in the chain_cnt column of
dba_tables.
> > If they are migrated rows (most likely), increase the PCTFREE for the
> > table, and reorg it. If they are true chained rows and the table
contains
> > LOBs, store the LOBs in a separate lob segment. If they're chained rows
> > and you're not using LOBs your choices are to increase the block size to
> > something large enough to accomodate the largest row, or live with it.
Be
> > advised that changing the block size requires recreating the database.
> >
> >
> > "Weerd Kirsten, E.C. de" <Kirsten.deWeerd_at_Oranjewoud.nl> wrote:
> >
> >
> >
> > Hi,
> >
> > I'm still looking for a cause of performance problems ...
> >
> > I have found a table, very frequently used in forms and procedures,
> > with about 10% chained rows. Other most frequently used tables have
> > about
> > 0,3 % chained rows. Could this be an issue ???
> >
> > Greets,
> >
> > Kirsten
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Weerd Kirsten, E.C. de
> > INET: Kirsten.deWeerd_at_Oranjewoud.nl
> >
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> Author: Weerd Kirsten, E.C. de
> INET: Kirsten.deWeerd_at_Oranjewoud.nl
>
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Received on Fri Oct 13 2000 - 00:36:12 CDT