database partitioning - How many partitions does mysql use by default ? While using partition by key - 


create table constraint_audit( model_name varchar(30), batch_id varchar(50), table_name varchar(100), success_count bigint, failure_count bigint, start_time bigint, end_time bigint) partition key(model_name);

here didn't mention partitions some_number. in case, mysql uses max number of partitions possible or 1 or else?


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