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To: SI Bob who wrote (11)	12/12/2004 10:04:11 PM
From: mas_	Read Replies (1) of 81

The primary key is messageid, and there are separate indexes for author, subject, and even recipient, since recipient is a selectable field in Advanced Search Is the primary key a clustered index as that will be a mistake. Probably subject should have the clustered index as that would guarantee that all messages for a subject would be stored next to each other in the table and make scanning a subject much easier as it would be over a contiguous disc area. The insert time might go up though and you might need weekly reloads to keep the table in a reasonable non-fragmented state. Messageid is pretty meaningless as a logical primary key although it is unique and it is standard practice to have a sequence as a primary key. Ordering the rows in this sequence which is probably the default unless you tell it different does not help any logical group scans though as you are almost guaranteed to access different parts of the whole table.

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