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From: Juan Rodrigo Alejandro Burgos Mella <[email protected]>
To: Ron Johnson <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: can stored procedures with computational sql queries improve API performance?
Date: Wed, 10 Jul 2024 16:37:01 -0400
Message-ID: <CAHbZ42yitXv_73f1HpCK79g6AeGdpgNJfmQ52JAQmxVU_G9FJg@mail.gmail.com> (raw)
In-Reply-To: <CANzqJaCazZXsg4UuJhLOf8KC_1+bZLpA35R-MHA2n4Muky9Q0w@mail.gmail.com>
References: <[email protected]>
	<CANzqJaCazZXsg4UuJhLOf8KC_1+bZLpA35R-MHA2n4Muky9Q0w@mail.gmail.com>

Great tip!!! Thx

El mié, 10 de jul de 2024, 16:17, Ron Johnson <[email protected]>
escribió:

> On Tue, Jul 9, 2024 at 8:58 PM Krishnakant Mane <[email protected]>
> wrote:
>
>> Hello.
>>
>> I have a straight forward question, but I am just trying to analyze the
>> specifics.
>>
>> So I have a set of queries depending on each other in a sequence to
>> compute some results for generating financial report.
>>
>> It involves summing up some amounts from tuns or of rows and also on
>> certain conditions it categorizes the amounts into types (aka Debit
>> Balance, Credit balance etc).
>>
>> There are at least 6 queries in this sequence and apart from 4 input
>> parameters. these queries never change.
>>
>> So will I get any performance benefit by having them in a stored
>> procedure rather than sending the queries from my Python based API?
>
>
> One problem is that the query planner reverts to a generic query plan if
> you execute the same query over and over in a loop in the SP.
>
> That bit us once.  A big SP that had been running "normally" for months
> suddenly went from about 20 minutes to six hours.  The solution (given by
> someone on this list a couple of years ago) was to add "set plan_cache_mode
> = force_custom_plan;" above the call.
>
> That way, the query plan was updated every time.  Performance dropped to
> about 8 minutes IIRC.
>
>

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