I have a speed problem with a query that involves 3 tables.
I focused the problem in a scan in a big table (70000 rows) using a indexed
field. The field is a "flag" field which values only can be 'Y' or 'N'.
In the query I look for the values 'N' (average value = 10 rows over the
70000). Postgres does a Seq Scan.
How can I speed up that scan? How can I force the use of the index?
Where can I found general recomendations to speed up queries?
TIA
Roberto
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Roberto Moreda
Resp. Dpto. Informática Handem/San Luis
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15300 Betanzos (A Coruña) - España
