[oracle-l] Re: Parallel Query determined by?
- From: <babette.turnerunderwood@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 23 Jan 2004 13:59:21 -0500
Could they possibly be talking about LGWR SYNC=3DPARALLEL Wait Events ??
From the 9.2.0.4 Install HTML:
"LGWR ASYNC or LGWR SYNC=3DPARALLEL Wait Events=20
The following wait events are for standby destinations configured with =
either the log writer (LGWR) ASYNC or LGWR SYNC=3DPARALLEL attributes:=20
LGWR wait on LNS: This wait event monitors the amount of time spent by =
the LGWRprocess waiting to receive messages on IPC channels from the =
network server.=20
LNS wait on LGWR: This wait event monitors the amount of time spent by =
the network server waiting to receive messages on IPC channels from the =
LGWR process.=20
LGWR-LNS wait on channel: This wait event monitors the amount of time =
spent by the LGWR process or the network server processes waiting to =
receive messages on IPC channels. "
- Babette
-----Original Message-----
From: ml-errors@xxxxxxxxxxx [mailto:ml-errors@xxxxxxxxxxx] On Behalf Of =
Kirtikumar Deshpande
Sent: 2004-01-21 9:39 AM
To: Multiple recipients of list ORACLE-L
Subject: Re: Parallel Query determined by?
I could not find an Oracle wait event named 'Parellel Sync Wait' (in =
v$event_name view in 7.3.4,
8.1.7.4, 9.2.0.4). =20
Precise may be calling something else a 'Parallel Sync Wait', or is =
smart enough to figure this
out when it seems Oracle isn't instrumented for this particular wait(?). =
Just pondering...=20
Does Presice on-line help have any mention of this wait?=20
Have you contacted Precise Tech Support?=20
=20
- Kirti=20
--- Jared.Still@xxxxxxxxxxx wrote:
> No other replies yet, so here goes.
>=20
> First of all, what does it really mean when you say:
>=20
> users are complaining that Precise is showing a whole lot of time in=20
> "Parallel Sync Wait".
>=20
> Are these end users, or developers? Seems rather curious that users =
would=20
> be mentioning this.
>=20
>=20
> Second, what % of wait time do the Sync Waits contribute to?
>=20
> If a small % of total, then there's not much point in spending time on =
it.
>=20
> Third, is this actually causing a performance problem, or is it just=20
> appearing
> as a 'trouble' item on some monitor?
>=20
> Jared
>=20
>=20
>=20
>=20
>=20
>=20
> mkline1@xxxxxxxxxxx
> Sent by: ml-errors@xxxxxxxxxxx
> 01/20/2004 11:29 AM
> Please respond to ORACLE-L
>=20
> =20
> To: Multiple recipients of list ORACLE-L =
<ORACLE-L@xxxxxxxxxxx>
> cc:=20
> Subject: Parallel Query determined by?
>=20
>=20
> I've inherited a system that has a whole lot of indexes set to degree =
10=20
> and many tables set to 2 & 4.
>=20
> The users are complaining that Precise is showing a whole lot of time =
in=20
> "Parallel Sync Wait".
>=20
> It is an HP box running 8.1.7.4 with 16 processors. The box is =
normally=20
> not very busy.
>=20
> Are there various init.ora settings that help the Parallel servers =
sync=20
> up, or is this just too high a setting?
>=20
> I'm suggesting we back of a good many of these things to simply 2 or 4 =
and=20
> then work our way up from there. Some of those indexes set to 10 are =
only=20
> 20 meg and 4 extents. There's no way they are getting 10 on that I =
would=20
> think.
>=20
> Can't find a whole lot on Metalink either. Or a good book on 800 gig=20
> warehouses using parallel?
>=20
> --
> 13308 Thornridge Ct
> Midlothian, VA 23112
> 804-744-1545
>
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--=20
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--=20
Author: Kirtikumar Deshpande
INET: kirtikumar_deshpande@xxxxxxxxx
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