Re: Select-Insert-Query
От | postgres@countup.de |
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Тема | Re: Select-Insert-Query |
Дата | |
Msg-id | 20040302004903.DA8D55A816E@kserver17.erfurt12.de обсуждение исходный текст |
Ответ на | Select-Insert-Query (postgres@countup.de) |
Ответы |
Re: Select-Insert-Query
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Список | pgsql-performance |
Hi, <br /><br />nobody has an idea? :-( <br /><br />-----Ursprüngliche Nachricht----- <br />Von: pgsql-performance-owner@postgresql.org[mailto:pgsql-performance-owner@postgresql.org] Im Auftrag von postgres@countup.de<br />Gesendet: Freitag, 27. Februar 2004 17:53 <br />An: pgsql-performance@postgresql.org <br />Betreff:[PERFORM] Select-Insert-Query <br /><br />Hi, <br /><br />what is the most performant way to select for examplethe first 99 rows of a table and insert them into another table... <br /><br />at the moment i do this: <br /><br/>for userrecord in select * from table where account_id = a_account_id and counter_id = userrecord.counter_id and visitortable_idbetween a_minid and a_maxid limit 99 loop <br />insert into lastusers (account_id, counter_id, date, ip, hostname)values(a_account_id,userrecord.counter_id,userrecord.date ,userrecord.ip,userrecord.hostname); <br />end loop; <br/><br />i think "limit" is a performance killer, is that right? but what to do instead <br /><br />thanks <br />bye <br/>
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