Date: Thu, 1 Jul 2021 11:32:31 -0500
From: Justin Pryzby <pryzby@telsasoft.com>
To: Ayub Khan <ayub.hp@gmail.com>
Cc: pgsql-performance@lists.postgresql.org
Subject: Re: slow performance with cursor
Message-ID: <20210701163231.GR21248@telsasoft.com>
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On Fri, 25 Jun 2021, 19:09 Ayub Khan, <ayub.hp@gmail.com> wrote:
> I am using postgresql 12 and using cursors in a stored procedure,
> executing procedure which has cursor is slowing down the call. However if I
> do not use the cursor and just execute the queries using JDBC (Java client)
> it's fast.
>
> Is there any setting which needs to be modified to improve the performance
> of cursors. Also facing slow response with reading blobs (images) from db.
> Not an ideal way for storing images in db but this is a legacy application
> and wanted to check if there a quick tweak which can improve the
> performance while reading blob data from db.

On Thu, Jul 01, 2021 at 07:29:31PM +0300, Ayub Khan wrote:
> I set the cursor_tuple_fraction to 1 now I am seeing high cpu for fetach
> all  in
> 
> The number of rows returned is less than 200. Why is the high cpu being
> shown for fetch all

It seems like you're asking for help, but need to show the stored procedure
you're asking for help with.