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List: postgresql-general
Subject: RE: Max_connections limit
From: "Ahmed, Nawaz (Fuji Xerox Australia)" <Nawaz.Ahmed () aus ! fujixerox ! com>
Date: 2019-06-26 7:00:04
Message-ID: SG2PR06MB2521E2C2B4742033F41C3E34BCE20 () SG2PR06MB2521 ! apcprd06 ! prod ! outlook ! com
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Hi,
If you reckon the application initiates such a large number of concurrent \
connections, I'd suggest you configure a connection pooler to avoid the connection \
overhead by PostgreSQL. max_connections will be the parameter you are looking at to \
configure but ensure it is configured in conjunction with a connection pooler.
[Fuji Xerox Australia]
Nawaz Ahmed
Database Administrator
From: Daulat Ram <Daulat.Ram@exponential.com>
Sent: Wednesday, 26 June 2019 4:18 PM
To: pgsql-general@lists.postgresql.org
Subject: Max_connections limit
Hello team,
We have migrated our database from Oracle 12c to Postgres 11. I need your \
suggestions , we have sessions limit in Oracle = 3024 . Do we need to set the same \
connection limit in Postgres as well. How we can decide the max_connections limit for \
postgres. Are there any differences in managing connections in Oracle and postgres.
SQL> show parameter sessions;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
java_max_sessionspace_size integer 0
java_soft_sessionspace_limit integer 0
license_max_sessions integer 0
license_sessions_warning integer 0
sessions integer 3024
shared_server_sessions integer
SQL>
Regards,
Daulat
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If you reckon the application initiates such a large number of \
concurrent connections, I’d suggest you configure a connection pooler to avoid \
the connection overhead by PostgreSQL. max_connections will be the parameter you are \
looking at to configure but ensure it is configured in conjunction with a connection \
pooler.<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><img \
width="146" height="66" style="width:1.525in;height:.6833in" id="_x0000_i1025" \
src="http://xww.aus.xerox.com/staffdirectory/ebizcard/images/wbbdcrfx2.jpg" alt="Fuji \
Xerox Australia"><o:p></o:p></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">Nawaz \
Ahmed</span></b><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span \
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">Database \
Administrator</span></i><br> <br>
<o:p></o:p></p>
</div>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Daulat \
Ram <Daulat.Ram@exponential.com> <br>
<b>Sent:</b> Wednesday, 26 June 2019 4:18 PM<br>
<b>To:</b> pgsql-general@lists.postgresql.org<br>
<b>Subject:</b> Max_connections limit<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hello team,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We have migrated our database from \
Oracle 12c to Postgres 11. I need your suggestions , we have sessions limit in Oracle \
=</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Lucida \
Console""> 3024 . </span><span lang="EN-US">Do we need to set the same \
connection limit in Postgres as well. How we can decide the max_connections limit for \
postgres. Are there any differences in managing connections in Oracle and \
postgres.</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Lucida \
Console""><o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida Console"">SQL> show parameter \
sessions;<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console""><o:p> </o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">NAME & \
nbsp; \
TYPE VALUE<o:p></o:p></span></p> <p \
class="MsoNormal" style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">------------------------------------ ----------- \
------------------------------<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">java_max_sessionspace_size \
integer 0<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">java_soft_sessionspace_limit \
integer 0<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">license_max_sessions \
integer 0<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">license_sessions_warning \
integer 0<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">sessions &nb \
sp; \
integer 3024<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="font-size:9.0pt;font-family:"Lucida \
Console"">shared_server_sessions \
integer<o:p></o:p></span></p> <p class="MsoNormal" style="text-autospace:none"><span \
lang="EN-US" style="font-size:9.0pt;font-family:"Lucida \
Console"">SQL><o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Regards,<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Daulat<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> </div>
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Arial, Helvetica, sans-serif; font-size: 10.6667px;"><br> IMPORTANT NOTE: Fuji Xerox \
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