Re: INITTRANS parameter settings

I was told that once an ITL was created it could not be reused for row data without destroying and recreating the block.

You say this is not true?
----- Original Message -----
From: K Gopalakrishnan <kaygopal_at_yahoo.com> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Monday, November 06, 2000 11:05 PM Subject: Re: INITTRANS parameter settings

> Tom ,
>
> The space reserved by INITRANS only can not be
> (re)used for rowdata. But the space claimed by
> maxtrans can always be used for data.
>
>
>
> --- Gaja Krishna Vaidyanatha <gajav_at_yahoo.com> wrote:
> > Tom,
> >
> > I think there might be a typo here, it is my
> > understanding that
> > each ITL entry is 23 bytes and not 43 bytes, unless
> > this has
> > changed in Oracle 8i. Last time I checked it was 23
> > bytes.
> >
> > Cheers,
> >
> > Gaja
> > --- Tom Pall <tom_at_cdproc.com> wrote:
> > > Initrans defines the inital number of 43 byte
> > interested
> > > transaction list (ITL)
> > > entries originally allocated in the data block.
> > Maxtrans
> > > defines the maximum
> > > number of ITLs a block can have.
> > >
> > > ITLs are where each session doing DML on a block
> > places its
> > > row locks.
> > > If one session at a time is doing DML, multiple
> > ITLs won't
> > > speed things up.
> > > Once an ITL is created, its space cannot be reused
> > for row
> > > data.
> > > Having initrans/maxtrans higher than needed for
> > concurrency
> > > wastes block space.
> > >
> > >
> > > ----- Original Message -----
> > > To: Multiple recipients of list ORACLE-L
> > > <ORACLE-L_at_fatcity.com>
> > > Sent: Monday, November 06, 2000 8:50 AM
> > >
> > >
> > > > Our client has a table which will have over 200
> > > > updates and 100 inserts every second. Should I
> > leave
> > > > the default setting for inittrans or should I
> > increase
> > > > the value of this parameter. Can someone shed
> > some
> > > > light on this issue.
> > > >
> > > > Thanks
> > > > Sonia P.
> > > >
> > > >
> > __________________________________________________
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> > =====
> > Gaja Krishna Vaidyanatha
> > Director, Storage Management Products, Quest
> > Software Inc.
> > Office : (972)-304-1170, E-mail : gajav_at_yahoo.com
> >
> > Author - Oracle Tuning 101 by Osborne McGraw-Hill
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> Author: K Gopalakrishnan
> INET: kaygopal_at_yahoo.com
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Received on Tue Nov 07 2000 - 08:04:25 CST