Palle, > Is it always bad to create index xx on yy (field1, field2, field3);
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No, it seldom bad, in fact. I have some indexes that run up to seven columns, becuase they are required for unique keys. Indexes of 3-4 columns are often *required* for many-to-many join tables. I'm afraid that you've been given some misleading advice. > I guess the problem is that the index might often grow bigger than the > table, or at least big enough not to speed up the queries? Well, yes ... a 4-column index on a 5-column table could be bigger than the table if allowed to bloat and not re-indexed. But that's just a reason for better maintainence. -- -Josh Berkus Aglio Database Solutions San Francisco ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
