What makes you think that ordering the mapping IDs like that would improve performance? Joining tables on IDs is what SQL databases are all about and they do it quicker than anything else.

You could have a thread table and put a threadid in each node. You'll be able to then fetch all items in a thread with a simple very fast join. The thread table could also have a threadid field (for a self join) for organising the nested threads

Or am I missing something in your requirement?

In reply to Re: Perl handling of a MYSQL bulletin board by ncw
in thread Perl handling of a MYSQL bulletin board by swiftone

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