MySQL table partition by month

Question

I have a huge table that stores many tracked events, such as a user click.

The table is already in the 10\'s of millions, and its growing larger everyday. The querie

Answer 1

HASHing by month with 6 partitions means that two months a year will land in the same partition. What good is that?

Don't bother partitioning, index the table.

Assuming these are the only two queries you use:

SELECT * from ti;
SELECT * from ti PARTITION (HASH(MONTH(some_date)));

then start the PRIMARY KEY with the_date.

The first query simply reads the entire table; no change between partitioned and not.

The second query, assuming you want a single month, not all the months that map into the same partition, would need to be

SELECT * FROM ti  WHERE the_date >= '2019-03-01'
                    AND the_date  < '2019-03-01' + INTERVAL 1 MONTH;

If you have other queries, let's see them.

(I have not found any performance justification for ever using PARTITION BY HASH.)