Re: db size

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От Adrian Moisey
Тема Re: db size
Дата
Msg-id 48070DC3.1040709@careerjunction.co.za
обсуждение исходный текст
Ответ на Re: db size  (Richard Huxton <dev@archonet.com>)
Ответы Re: db size
Список pgsql-performance
Hi

>> INFO:  "blahxxx": scanned 27 of 27 pages, containing 1272 live rows
>> and 0 dead rows; 1272 rows in sample, 1272 estimated total rows
>
> This is a small table that takes up 27 pages and it scanned all of them.
> You have 1272 rows in it and none of them are dead (i.e. deleted/updated
> but still taking up space).

I had a look through a few other tables...:

INFO:  "table1": scanned 22988 of 22988 pages, containing 2713446 live
rows and 895662 dead rows; 45000 rows in sample, 2713446 estimate
d total rows

INFO:  "table2": scanned 24600 of 24600 pages, containing 270585 live
rows and 65524 dead rows; 45000 rows in sample, 270585 estimated total rows

Is that dead rows an issue?  Should I try clean it out?  Will it improve
performance ?


--
Adrian Moisey
Systems Administrator | CareerJunction | Your Future Starts Here.
Web: www.careerjunction.co.za | Email: adrian@careerjunction.co.za
Phone: +27 21 686 6820 | Mobile: +27 82 858 7830 | Fax: +27 21 686 6842

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