Thread: understanding output from Explain

understanding output from Explain

From
Tom Allison
Date:
"Seq Scan on"  - is this just a FULL TABLE scan?

I'm familiar with Oracles explain plans and terminology.
But not so much so with psql...

Re: understanding output from Explain

From
"A. Kretschmer"
Date:
am  Sun, dem 22.04.2007, um  9:43:32 -0400 mailte Tom Allison folgendes:
> "Seq Scan on"  - is this just a FULL TABLE scan?

Yes.


Andreas
--
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID:   0x3FFF606C, privat 0x7F4584DA   http://wwwkeys.de.pgp.net

Re: understanding output from Explain

From
tom
Date:
Is there a tutorial on this stuff?
I did check the Really Fine Manual and they said explain plans are
beyond the scope RTFM.



On Apr 22, 2007, at 10:36 AM, A. Kretschmer wrote:

> am  Sun, dem 22.04.2007, um  9:43:32 -0400 mailte Tom Allison
> folgendes:
>> "Seq Scan on"  - is this just a FULL TABLE scan?
>
> Yes.
>
>
> Andreas
> --
> Andreas Kretschmer
> Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
> GnuPG-ID:   0x3FFF606C, privat 0x7F4584DA   http://wwwkeys.de.pgp.net
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>        choose an index scan if your joining column's datatypes do not
>        match