RE: SQL*Net Message to client wait on batch job

From: Cary Millsap <cary.millsap_at_hotsos.com>
Date: Mon, 23 Aug 2004 10:05:00 -0500
Message-ID: <00a801c48922$93813b70$6501a8c0@CVMLAP02>

Thomas,

I agree with Stephane; the [only] way to fix this problem is to stop = your
application from making so many database calls.

A couple of added bits of information:

The p1=3D1 value for "SQL*Net message to client" events is described = in V$EVENT_NAME as "bytes," but it is not a correct byte count. You can = confirm this by using truss (strace, etc.).
The duration of "SQL*Net message to client," as far as my tests have = been able to tell me, is /never/ dependent upon network load. The event maps = to an OS write(SQLNET_OUT, ...) call. The latency of that write call does = not include any time spent on a network.

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
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-----Original Message-----
From: oracle-l-bounce_at_freelists.org =
[mailto:oracle-l-bounce_at_freelists.org]
On Behalf Of Stephane Faroult
Sent: Monday, August 23, 2004 9:54 AM
To: oracle-l_at_freelists.org
Subject: Re: SQL*Net Message to client wait on batch job

Thomas,

Those waits are typical of a 'line-by-line' logic. The remark in = Kirti's
book applies to (specifically) 'to client' (as opposed to 'from client') waits. Here you have both, which means that most of the time is spent blabbing on the network. I am ready to bet your insert is in a loop. If = you
really love loops, try to call a stored proc instead. But some INSERT = ...
SELECT ... would be far, far better.

HTH,=20 Stephane Faroult=20

On Mon, 23 Aug 2004 09:41 , 'Thomas Biju' <BThomas_at_br-inc.com> sent:

Hello gurus,

We upgraded Peoplesoft to Oracle9i over the weekend. So far everything = work=3D
s great except one batch job. Did an extended trace and the waits are on SQL*net message event. I got the driver id and bytes (always 1 it = se=3D
ems!!) from the trace file. But do not know where to go from here. Kirti's book says "the client process may be too busy to accept = the d=3D
elivery of message". How do I verify this?=3D20

Here is few lines of the trace output:

PARSING IN CURSOR #25 len=3D3D300 dep=3D3D0 uid=3D3D614 oct=3D3D2 = lid=3D3D614 tim=3D3D2=3D
08054417239 hv=3D3D33
01285365 ad=3D3D'44820a70'
INSERT INTO PS_BR_PYT_PROJECTS (BUSINESS_UNIT, PROJECT_ID, BR_PAYOUT_ID, = AC=3D
TIVIT
Y_ID, ACCOUNT, ACCOUNT_TYPE, ACCOUNTING_DT, RESOURCE_ID, JOURNAL_ID, = JOURNA=3D
L_LIN
E, PRODUCT, CURRENCY_CD, BR_AO_PROP_XREF, ACTIVITY_TYPE, AMOUNT) VALUES = ('B=3D
R', :
1, :2, :3, :4, :5, :6, :7, :8, :9, :10, :11, :12, :13, :14) END OF STMT

EXEC =
#25:c=3D3D0,e=3D3D627,p=3D3D0,cr=3D3D0,cu=3D3D8,mis=3D3D0,r=3D3D1,dep=3D3=
D0,og=3D3D4,tim=3D

=3D3D208054417197
WAIT #25: nam=3D3D'SQL*Net message to client' ela=3D3D 5 = p1=3D3D1229996800 p2=3D3D1=3D
p3=3D3D0
WAIT #25: nam=3D3D'SQL*Net message from client' ela=3D3D 862 = p1=3D3D1229996800 p2=3D
=3D3D1 p3=3D3D0

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Received on Mon Aug 23 2004 - 10:04:12 CDT