Indexes advantageous on foreign key columns

["Maria L. Wilson" <Maria.L.Wilson-1@xxxxxxxx>]

Was hoping that someone would like to discuss the need for indexes on 
columns that are referenced in a foreign key.  Are they necessary?  Are 
they worth the overhead?   PostgreSQL version 8.4

thanks,  Maria Wilson
Nasa, Langley Research Center
Hampton, Virginia 23681

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