From feng.zhou@wellintech.com Wed Dec  7 11:30:17 2011
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From: "feng.zhou" <feng.zhou@wellintech.com>
To: "pgsql-sql" <pgsql-sql@postgresql.org>
Subject: No response from the backend
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Hi
There are some questions when using progreSQL8.4.2. I don't sure this problem is bug.The detail is following:
I make a client program that communicate with  progreSQL by ODBC on Windows7. After running serveral months, this client program is hung at 00:01 in 2011-11-26 , and become OK after 8 hours.When becoming OK, client program log message is following: 

2011/11/26 08:38:05.527,  : SQL ERROR: GetSelectRowNum: No response from the backend;
No response from the backend
2011/11/26 08:38:05.527,   : SQL ERROR: GetSelectRowNum: State:42601,Native:26
2011/11/26 08:38:05.527,   : SQL ERROR: GetSelectRowNum: Could not send Query(connection dead);
Could not send Query(connection dead)

I don't know how to solve this problem. Someone can explain this problem cause.Thanks

2011-12-07 



feng.zhou 

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<DIV><FONT size=2 face=Verdana>
<DIV><FONT size=2>Hi</FONT></DIV>
<DIV>There are some questions when using progreSQL8.4.2. I don't sure this 
problem is bug.The detail is following:</DIV>
<DIV>I&nbsp;make a&nbsp;client program that communicate 
with&nbsp;&nbsp;progreSQL by ODBC on Windows7. After running serveral months, 
this client program is hung at 00:01 in 2011-11-26 , and become OK after 8 
hours.When becoming OK, client program log message is following:&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>2011/11/26&nbsp;08:38:05.527,&nbsp;&nbsp;:&nbsp;SQL&nbsp;ERROR:&nbsp;GetSelectRowNum:&nbsp;<FONT 
color=#ff0000>No&nbsp;response&nbsp;from&nbsp;the&nbsp;backend</FONT>;</DIV>
<DIV>No&nbsp;response&nbsp;from&nbsp;the&nbsp;backend</DIV>
<DIV>2011/11/26&nbsp;08:38:05.527,&nbsp;&nbsp;&nbsp;:&nbsp;SQL&nbsp;ERROR:&nbsp;GetSelectRowNum:&nbsp;State:42601,Native:26</DIV>
<DIV>
<DIV>
<DIV>2011/11/26&nbsp;08:38:05.527,&nbsp;&nbsp;&nbsp;:&nbsp;SQL&nbsp;ERROR:&nbsp;GetSelectRowNum:&nbsp;<FONT 
color=#ff0000>Could&nbsp;not&nbsp;send&nbsp;Query(connection&nbsp;dead);</FONT></DIV>
<DIV>Could&nbsp;not&nbsp;send&nbsp;Query(connection&nbsp;dead)</DIV>
<DIV>&nbsp;</DIV>
<DIV>I don't know how to solve this problem. Someone can explain this problem 
cause.Thanks</DIV></DIV></DIV></DIV></FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT>&nbsp;</DIV>
<DIV align=left><FONT color=#c0c0c0 size=2 face=Verdana>2011-12-07 
</FONT></DIV><FONT size=2 face=Verdana>
<HR style="WIDTH: 122px; HEIGHT: 2px" align=left SIZE=2>

<DIV><FONT color=#c0c0c0 size=2 face=Verdana><SPAN>feng.zhou</SPAN> 
</FONT></DIV></FONT></BODY></HTML>

--=====003_Dragon448228876823_=====--




From ringerc@ringerc.id.au Wed Dec  7 13:26:06 2011
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Date: Wed, 07 Dec 2011 21:25:47 +0800
From: Craig Ringer <ringerc@ringerc.id.au>
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To: "feng.zhou" <feng.zhou@wellintech.com>
CC: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: No response from the backend
References: <201112071927138456264@wellintech.com>
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On 12/07/2011 07:27 PM, feng.zhou wrote:
> Hi
> There are some questions when using progreSQL8.4.2. I don't sure this 
> problem is bug.The detail is following:
> I make a client program that communicate with  progreSQL by ODBC on 
> Windows7. After running serveral months, this client program is hung 
> at 00:01 in 2011-11-26 , and become OK after 8 hours.When becoming OK, 
> client program log message is following:
> 2011/11/26 08:38:05.527,  : SQL ERROR: GetSelectRowNum: 
> No response from the backend;
> No response from the backend
> 2011/11/26 08:38:05.527,   : SQL ERROR: GetSelectRowNum: State:42601,Native:26
> 2011/11/26 08:38:05.527,   : SQL ERROR: GetSelectRowNum: 
> Could not send Query(connection dead);
> Could not send Query(connection dead)
> I don't know how to solve this problem. Someone can explain this 
> problem cause.Thanks

I'd say you had a connectivity drop-out, and it only recovered when your 
TCP/IP connection timed out. Reduce your TCP/IP timeouts and/or enable 
keepalives if you have an unreliable network connection between client 
and server.

If that's not the case, then more detail please. Where do the client and 
server run (same machine?)? How are they connected? etc.

--
Craig Ringer

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    On 12/07/2011 07:27 PM, feng.zhou wrote:
    <blockquote cite="mid:201112071927138456264@wellintech.com"
      type="cite">
      <meta content="text/html; charset=ISO-8859-1"
        http-equiv="Content-Type">
      <meta name="GENERATOR" content="MSHTML 8.00.6001.18928">
      <link rel="stylesheet"
href="BLOCKQUOTE%7Bmargin-Top:%200px;%20margin-Bottom:%200px;%20margin-Left:%202em%7D">
      <div><font face="Verdana" size="2">
          <div><font size="2">Hi</font></div>
          <div>There are some questions when using progreSQL8.4.2. I
            don't sure this problem is bug.The detail is following:</div>
          <div>I&nbsp;make a&nbsp;client program that communicate with&nbsp;&nbsp;progreSQL
            by ODBC on Windows7. After running serveral months, this
            client program is hung at 00:01 in 2011-11-26 , and become
            OK after 8 hours.When becoming OK, client program log
            message is following:&nbsp;</div>
          <div>&nbsp;</div>
          <div>
            <div>2011/11/26&nbsp;08:38:05.527,&nbsp;&nbsp;:&nbsp;SQL&nbsp;ERROR:&nbsp;GetSelectRowNum:&nbsp;<font
                color="#ff0000">No&nbsp;response&nbsp;from&nbsp;the&nbsp;backend</font>;</div>
            <div>No&nbsp;response&nbsp;from&nbsp;the&nbsp;backend</div>
            <div>2011/11/26&nbsp;08:38:05.527,&nbsp;&nbsp;&nbsp;:&nbsp;SQL&nbsp;ERROR:&nbsp;GetSelectRowNum:&nbsp;State:42601,Native:26</div>
            <div>
              <div>
                <div>2011/11/26&nbsp;08:38:05.527,&nbsp;&nbsp;&nbsp;:&nbsp;SQL&nbsp;ERROR:&nbsp;GetSelectRowNum:&nbsp;<font
                    color="#ff0000">Could&nbsp;not&nbsp;send&nbsp;Query(connection&nbsp;dead);</font></div>
                <div>Could&nbsp;not&nbsp;send&nbsp;Query(connection&nbsp;dead)</div>
                <div>&nbsp;</div>
                <div>I don't know how to solve this problem. Someone can
                  explain this problem cause.Thanks</div>
              </div>
            </div>
          </div>
        </font></div>
    </blockquote>
    <br>
    I'd say you had a connectivity drop-out, and it only recovered when
    your TCP/IP connection timed out. Reduce your TCP/IP timeouts and/or
    enable keepalives if you have an unreliable network connection
    between client and server.<br>
    <br>
    If that's not the case, then more detail please. Where do the client
    and server run (same machine?)? How are they connected? etc.<br>
    <br>
    --<br>
    Craig Ringer<br>
  </body>
</html>

--------------070208020409020305000105--



From feng.zhou@wellintech.com Thu Dec  8 01:41:24 2011
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From ringerc@ringerc.id.au Thu Dec  8 04:12:00 2011
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Message-ID: <4EE038F6.7020307@ringerc.id.au>
Date: Thu, 08 Dec 2011 12:11:34 +0800
From: Craig Ringer <ringerc@ringerc.id.au>
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To: "feng.zhou" <feng.zhou@wellintech.com>
CC: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: No response from the backend
References: <201112071927138456264@wellintech.com>,
	<4EDF695B.1010008@ringerc.id.au>
	<201112080938162090937@wellintech.com>
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On 12/08/2011 09:38 AM, feng.zhou wrote:
> Thanks for your answer.
> The client and server run on the same machine(Windows7). They are 
> connected by ODBC.The client accesses server by call ODBC 
> API.Connection and query timeout don't be set in the client.
>

Since client and server are on the same host, it's unlikely to be 
network connectivity. Check the server logs.

--
Craig Ringer

--------------080106030904090905000900
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    On 12/08/2011 09:38 AM, feng.zhou wrote:
    <blockquote cite="mid:201112080938162090937@wellintech.com"
      type="cite">
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          <div><font color="#000080" face="Verdana" size="2"><font
                color="#000000">Thanks for your answer.</font></font></div>
          <div>The client and server run on the same machine(Windows7).
            They are connected by ODBC.The client accesses server by
            call ODBC API.Connection and query timeout don't be set in
            the client. </div>
        </font></div>
      <br>
    </blockquote>
    <br>
    Since client and server are on the same host, it's unlikely to be
    network connectivity. Check the server logs.<br>
    <br>
    --<br>
    Craig Ringer<br>
  </body>
</html>

--------------080106030904090905000900--



From feng.zhou@wellintech.com Thu Dec  8 04:22:21 2011
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--=====003_Dragon834543133628_=====--