Re: Index Usage Question

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От scott.marlowe
Тема Re: Index Usage Question
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Msg-id Pine.LNX.4.33.0310270740220.14359-100000@css120.ihs.com
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Ответ на Index Usage Question  ("Staff, Alexander" <alexander.staff@sap.com>)
Список pgsql-general
On Fri, 24 Oct 2003, Staff, Alexander wrote:

> Hi,
> I created a simple table (name char200, zip char10, city char200, street char200, id int) and filled some data, appr.
250000 records, in it. 
> I tested accessing some rows (select id from address where id = 44444;, select * from address where id between 33333,
333444)with an unique index on id and without an index. EXPLAIN tells me in both cases that it does NOT use the index. 
> I tested this with using the name column (select name from address where name like 'Wal%';, select name from address
wherename = 'Walz') and if I created an index on name it uses it.  
> Using id in the where clause of the select is as slow as using an unindexed name in the where-clause.
> I ran ANALYZE, no changes.
> What's this ?
> This is not a feature, is it ?

Can we see the output of explain analyze select...(your query here)???


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