Handling Duplicates. MySQL provides a way to deal with duplicate keys using the ON DUPLICATE KEY UPDATE statement. Whenever a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the existing row is performed. INSERT INTO table (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1;. How MySQL sequence works. The AUTO_INCREMENT column has the following attributes: The starting value of an AUTO_INCREMENT column is 1 and it is increased by 1 when you insert a NULL value into the column or when you omit its value in the INSERT statement. To obtain the last generated sequence number, you use the LAST_INSERT_ID () function. If so, it's likely because the DATA DIRECTORY is already being used by another part of MySQL. The partition data directories can't be subdirectories of MySQL's current data directory. The best thing to do is make a new directory maybe mysql_part that is easily accessible. Partition Naming between Tables.

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