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From: legrand legrand <legrand_legrand@hotmail.com>
To: "pgsql-general@lists.postgresql.org" <pgsql-general@lists.postgresql.org>
Subject: Fast switchover
Thread-Topic: Fast switchover
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Date: Mon, 8 Sep 2025 15:03:41 +0000
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--_000_AS1P190MB17014CF63D3EDDB0F4F7B66B900CAAS1P190MB1701EURP_
Content-Type: text/plain; charset="iso-8859-1"
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Hello all the readers,

For some projects we need a fast manual switchover to address Near Zero dow=
ntime maintenance
(not speaking here about automated failover like those provided by HA tools=
, but just planned, controlled operations)


Database Physical replication switchover itself:
- initial replication (before switchover) should be synchronous or replicat=
ion LAG should be controlled to prevent data loss.
- Switchover duration seems not "compressible" under a few seconds (because=
 of primary shutdown, promotion, new standby catch up, ...)
- Application retry strategy (after disconnection) should be tuned using pr=
oper retry delay. Pooler or specific driver may help.


May logical replication ( bi-directional, with one instance RW and the othe=
r RO) be a better solution ?
This solution is more complex because of sequences, DDL, Large Objects, Con=
flict resolution (if any)
but switchover should be faster ...

what could we expect (in term of downtime in both worlds) ?
Are there any Logical Replication Manager available, or admin tools (prefer=
ably open source) ?
any feedback is welcome

Thanks in advance
Regards
PAscal

--_000_AS1P190MB17014CF63D3EDDB0F4F7B66B900CAAS1P190MB1701EURP_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Hello all the readers,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
For some projects we need a fast <b>manual</b>&nbsp;switchover to address N=
ear Zero downtime maintenance</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
(not speaking here about automated failover like those provided by HA tools=
, but just planned, controlled operations)</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Database Physical replication switchover itself:</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
- initial replication (before switchover) should be synchronous or replicat=
ion LAG should be controlled to prevent data loss.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
- Switchover duration seems not &quot;compressible&quot; under a few second=
s (because of primary shutdown, promotion, new standby catch up, ...)</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
- Application retry strategy (after disconnection) should be tuned using pr=
oper retry delay. Pooler or specific driver may help.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
May logical replication ( bi-directional, with one instance RW and the othe=
r RO) be a better solution ?</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
This solution is more complex because of sequences, DDL, Large Objects, Con=
flict resolution (if any)</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
but switchover should be faster ...</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
what could we expect (in term of downtime in both worlds) ?</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Are there any <b>Logical Replication Manager</b>&nbsp;available, or admin t=
ools (preferably open source) ?</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
any feedback is welcome</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Thanks in advance</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Regards</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
PAscal</div>
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