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help / color / mirror / Atom feedFrom: Vladimir Sitnikov <sitnikov.vladimir@gmail.com>
To: Igor Korot <ikorot01@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-generallists.postgresql.org <pgsql-general@lists.postgresql.org>
Cc: Rob Sargent <robjsargent@gmail.com>
Subject: Re: Double prepare
Date: Sat, 16 May 2026 17:37:38 +0300
Message-ID: <CAB=Je-EG4j-MUGRdQbRVuNNz=eLUa3b-zhi7Zw+seaOY4SdN7w@mail.gmail.com> (raw)
In-Reply-To: <CAB=Je-HxpyNNbn7girF6Mouf4gmzNQN=jdkrM49VwEtT_uFf4w@mail.gmail.com>
References: <1495292.1778939187@sss.pgh.pa.us>
<02D2D7C5-7932-4030-B65A-4BECB645E9F0@gmail.com>
<CAB=Je-HxpyNNbn7girF6Mouf4gmzNQN=jdkrM49VwEtT_uFf4w@mail.gmail.com>
A couple more things to keep in mind:
1) The client has to re-prepare statements on "deallocate all", "alter",
"create", "drop", "alter", "set search_path" statements.
The backend does not automatically keep the prepared statement workable
across those calls.
The offending error messages are "ERROR: cached plan must not change result
type", "ERROR: prepared statement "S_2" does not exist"
2) I've an answer regarding "prepared statement lifespan" at
https://stackoverflow.com/questions/32297503/whats-the-life-span-of-a-postgresql-server-side-prepare...
Looking forward to adding more references there. Feel free pinging me in
the comments.
Vladimir
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Subject: Re: Double prepare
In-Reply-To: <CAB=Je-EG4j-MUGRdQbRVuNNz=eLUa3b-zhi7Zw+seaOY4SdN7w@mail.gmail.com>
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