From: | Dennis <dennis(at)zserve(dot)com> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Multiple Indexes |
Date: | 2001-07-02 15:36:15 |
Message-ID: | 9hq4dh$13a$1@news.tht.net |
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Thread: | |
Lists: | pgsql-sql |
Hi Group,
Lets say table a has fields: id serial, name varchar(20) not null, and
somedata int not null.
I'll be doing lots of queries on this table so I'll want to define and
index. ( or two? ).
Some queries will only look up the name. Others will look up the name
depending on somedata.
If I were to define and index like this:
1) create index i on sometable ( name, somedata );
and another one like this:
2) create index i2 on sometable ( name );
Would that be better than defining only the first index?
What I am asking is:
Should I have an index devoted to just the name field, or
would that first index work just fine? I know that more indexes
means slower time on inserts.
Any suggestions appreciated.
-Dennis
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