[oracle-l] Re: Parallel Query determined by?

From: <babette.turnerunderwood_at_hrdc-drhc.gc.ca>
Date: Fri, 23 Jan 2004 13:59:21 -0500
Message-ID: <FCF2E0B5B7A9CC4EAAD504CE0D2BB5B317EC28@NCEV02.hrdc-drhc.net>

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_at_fatcity.com [mailto:ml-errors_at_fatcity.com] 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_at_radisys.com 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_at_comcast.net
  > Sent by: ml-errors_at_fatcity.com
  > 01/20/2004 11:29 AM
  > Please respond to ORACLE-L
  >=20
  > =20
  > To: Multiple recipients of list ORACLE-L =
  <ORACLE-L_at_fatcity.com>
  > 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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Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes http://hotjobs.sweepstakes.yahoo.com/signingbonus --=20
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Author: Kirtikumar Deshpande
  INET: kirtikumar_deshpande_at_yahoo.com

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