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Re: Inserting at Extreme Volumes
Posted by: Jonathan Stephens
Date: October 15, 2006 12:02AM

Just so there's no misunderstanding - it's possible to use HOUR() as a partitioning function, but (unlike TO_DAYS() and YEAR()) it's not optimised at this time.

Part of the problem is that HOUR() is not strictly increasing or strictly decreasing, and changing its behaviour in this regard would likely break existing apps. We'd have to add a TO_HOURS() function that returns the number of hours since the Unix Epoch (and so would be strictly increasing). You might want to check the bugs system to see if someone's filed a feature request for this, and if they haven't, file one. (Note that MySQL 5.1 is now in beta which means "no new features", so this couldn't be added before 5.2.)

Jon Stephens
MySQL Documentation Team @ Oracle
Orlando, Florida, USA

MySQL Dev Zone
MySQL Server Documentation
Oracle

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