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Is it possible to predict the amount of disk space/memory that will be used by a basic index in PostgreSQL 9.0?
E.g. If I have a default B-tree index on an integer column in a table of 1 million rows, how much space would be taken up by the index? Is the entire index held in memory at all times?
There is no way to say that. It depends on the type of operations you will make, as PostgreSQL stores many different versions of the same row, including row versions stored in index files.
Just make the table you are interested in and check it.