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Range partition and unique key
Posted by: Pierrick VODOZ
Date: September 24, 2014 08:42AM

Hi,
I would like to have some help but I think that my problem has no solution...

Here is the description of my table:
CREATE TABLE `full1` (
`NUM_INTERVENTION` int(13) NOT NULL DEFAULT '0',
`DATE_IT` date NOT NULL,
PRIMARY KEY (`NUM_INTERVENTION`),
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci

When I add some lines in the table, I must check that the NUM_INTERVENTION field is unique. That's one of the reason why this is my primary key.
Indeed, I can try to add 2 lines with same NUM_INTERVENTION but different DATE_IT so the db must only accept the first row entered (only one unique NUM_INTERVENTION...)

This table is very big (more 20000000 lines) so I would like to have a range partition based on YEAR(DATE_IT)
But it seems that all column used in the parition expression (DATE_IT in my case) must be included in all unique key also in primary key.
But if I set the DATE_IT in my primary key, the db will accept multiple rows with same NUM_INTERVENTION and I don't want it.


for the moment, I assume that I can only make my own partition by creating many table like full1_2014, full1_2015, full1_2016 and manually choose the table when inserting my rows depending the year of the DATE_IT field.

For the SELECT, use the UNION operator between differents tables....

Can you confirm that the only way to solve my issue?

thanks!

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