RE: How to determin the parallel method is used

From: Koivu, Lisa <lkoivu_at_qode.com>
Date: Tue, 1 Aug 2000 08:03:24 -0400
Message-Id: <10576.113468@fatcity.com>

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Yes. You will see stuff that resembles gibberish in the explain plan = if
parallel query takes over (A1, B1, things that don't refer to the = database
objects directly) plus you will see the keyword PARALLEL. Bear in mind = that
parallel query is more likely to happen if a table is partitioned = and/or a
full table scan happens on one of the larger tables. =20

You will also see the parallel slave processes in the OS.=20

You can also encourage parallel query by setting the degree of a table = or
index to be > 1. Setting degree to default can spawn a lot more = parallel
slaves than you expect.=20

I used to have a script that would display parallel explain plans in a = nice
neat manner, I think I got it from this list. Anyone?

HTH
Lisa
Ft. Lauderdale, FL, USA

-----Original Message-----
From: cyhu_at_eachnet.com [mailto:cyhu_at_eachnet.com] Sent: Tuesday, August 01, 2000 7:27 AM
To: Multiple recipients of list ORACLE-L Subject: How to determin the parallel method is used

Hi,everyone.
I configured the server to run the parallel option. Then I run a sql with a parallel hint.
Now , I wanna know if this sql has used the parallen execution plan. Can I see it in the sql's execution plan ( at sqlplus, set autotrace on = ).

Forgive my poor English.
Thanks in advance.

Chunyu Hu=A3=ACDBA
=BA=FA=B4=BA=D3=EA=A3=AC=CA=FD=BE=DD=BF=E2=B9=DC=C0=ED=D4=B1 http://www.eachnet.com

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Yes.  You will see stuff that resembles =
gibberish in the explain plan if parallel query takes over (A1, B1, = things that don't refer to the database objects directly) plus you will = see the keyword PARALLEL.  Bear in mind that parallel query is = more likely to happen if a table is partitioned and/or a full table = scan happens on one of the larger tables.

You will also see the parallel slave processes in the =
OS. 


You can also encourage parallel query by setting the =
degree of a table or index to be > 1.  Setting degree to = default can spawn a lot more parallel slaves than you expect. =


I used to have a script that would display parallel =
explain plans in a nice neat manner, I think I got it from this = list.  Anyone?

HTH
 Lisa
 Ft. Lauderdale, FL, USA


-----Original Message-----
 From: cyhu_at_eachnet.com [<A =
HREF=3D"mailto:cyhu_at_eachnet.com">mailto:cyhu_at_eachnet.com</A>]
 Sent: Tuesday, August 01, 2000 7:27 AM
 To: Multiple recipients of list ORACLE-L
 Subject: How to determin the parallel method is =
used

 
 

Hi,everyone.
 I configured the server to run the parallel =
option.
 Then I run a sql with a parallel hint.
 Now , I wanna know if this sql has used the parallen =
execution plan.
 Can I see it in the sql's execution plan ( at =
sqlplus, set autotrace on ).


Forgive my poor English.
 Thanks in advance.


-------------------------------
 Chunyu Hu=A3=ACDBA
 =BA=FA=B4=BA=D3=EA=A3=AC=CA=FD=BE=DD=BF=E2=B9=DC=C0=ED=D4=B1</F= ONT>
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TARGET=3D"_blank">http://www.eachnet.com</A>
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 E-mail=A3=BAcyhu_at_eachnet.com
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Received on Tue Aug 01 2000 - 07:03:24 CDT