Re: [PERFORM] Variable versus constrant size tuples

2011-08-22 Thread Krzysztof Chodak
Thank you. Now I see that page consists of record pointers list build from offset and length so there is no benefit of having constant length here. On Fri, Aug 19, 2011 at 17:03, Merlin Moncure mmonc...@gmail.com wrote: On Fri, Aug 19, 2011 at 4:03 AM, Krzysztof Chodak

[PERFORM] Variable versus constrant size tuples

2011-08-19 Thread Krzysztof Chodak
Is there any performance benefit of using constant size tuples? -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance

Re: [PERFORM] Variable versus constrant size tuples

2011-08-19 Thread Andy Colson
On 8/19/2011 4:03 AM, Krzysztof Chodak wrote: Is there any performance benefit of using constant size tuples? If you are referring to varchar(80) vs text, then no, there is no benefit. -Andy -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to

Re: [PERFORM] Variable versus constrant size tuples

2011-08-19 Thread Merlin Moncure
On Fri, Aug 19, 2011 at 4:03 AM, Krzysztof Chodak krzysztof.cho...@gmail.com wrote: Is there any performance benefit of using constant size tuples? not really. If your tuple size is under a known maximum length, then a toast table doesn't have to be created. that's a pretty minor detail