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Consider an indexed MySQL table with 7 columns, being constantly queried and written to. What is the advisable number of rows that this table should be allowed to contain before the performance would be improved by splitting the data off into other tables?
Whether or not you would get a performance gain by partitioning the data depends on the data and the queries you will run on it. You can store many millions of rows in a table and with good indexes and well-designed queries it will still be super-fast. Only consider partitioning if you are already confident that your indexes and queries are as good as they can be, as it can be more trouble than its worth.