Thanks for your reply.
I wander that Key partitioning is used primaryly to ensure an even distribution of data like hash partitioning.
This is about Hash Partitioning:
https://dev.mysql.com/doc/refman/5.6/en/partitioning-hash.html
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Partitioning by HASH is used primarily to ensure an even distribution of data among a predetermined number of partitions.
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And then This is about Key Partitioning;
https://dev.mysql.com/doc/refman/5.6/en/partitioning-key.html
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Partitioning by key is similar to partitioning by hash
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Is there a performance issue in my table schema.
What do I have to change for the table schema ?
Thanks