From: mallah@trade-india.com
To: josh@agliodbs.com
Cc: pgsql-sql@postgresql.org
Subject: Re: Why is seq search preferred here by planner?
Date: Wed, 23 Apr 2003 22:42:26 +0530 (IST)
Message-ID: <1248.219.65.233.8.1051117946.squirrel@mail.trade-india.com> (raw)
In-Reply-To: <200304231000.20578.josh@agliodbs.com>
References: <1220.219.65.235.51.1051114881.squirrel@mail.trade-india.com>
<200304231000.20578.josh@agliodbs.com>
> Mallah,
>
>> UPDATE email_bank set country=personal_account_details.country where userid
>> > 0 and userid=personal_account_details.userid ;
>
> While Postgres is letting you "fudge", you are missing part of that SQL statement. It should
> be:
>
> UPDATE email_bank set country=personal_account_details.country
> FROM personal_account_details
> where userid > 0 and userid=personal_account_details.userid ;
yes this is the proper SQL , but that also works and have same results.
>
>> tradein_clients=# begin work;explain analyze UPDATE email_bank set
>> country=personal_account_details.country where userid > 0 and
>> userid=personal_account_details.userid ;BEGIN
>> Time: 669.57 ms
>
> Hmmm ... 669 ms seems pretty speedy for updating 150,000 rows. What's the problem?
Hmm i am not running postgresql on a CRAY :-)
that was the time for "begin work;" since
i am explain analysing an update i am putting it in transaction.
the actualt time was nearing 300 secs which is 5 mins
i did an explain of the UPDATE FROM variant of the query it has the same
plan for it.
regds
mallah.
>
> --
> Josh Berkus
> Aglio Database Solutions
> San Francisco
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To: pgsql-sql@postgresql.org
Cc: mallah@trade-india.com, josh@agliodbs.com
Subject: Re: Why is seq search preferred here by planner?
In-Reply-To: <1248.219.65.233.8.1051117946.squirrel@mail.trade-india.com>
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