One of the easier cases would be non-overlapping (exclusive) constraints
on union subtables on the joined column.
This could serve as a "partition key", or in case of many nonoverlapping
columns (ex.: table is partitioned by date and region), as many
partition keys.
Yes, thats my planned direction.
In case you didn't know btw, MySQL 5.1 is out with rather extensive
table partition support. So get coding :D
Chris
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TIP 5: don't forget to increase your free space map settings
