do database transactions prevent other users from interfering with it

Question

Suppose I do (note: the syntax below is probably not correct, but don\'t worry about it...it\'s just there to make a point)

Start Transaction
INSERT INTO tab         


        

Answer 1

For efficiency reasons, developers do not set transactions to totally isolated for each other. Databases support multiples isolation levels namely Serializable, Repeatable reads, Read committed and Read uncommitted. They are list from the most strict to least strict.