START TRANSACTION SQL - Language Statements START TRANSACTION start a transaction block START TRANSACTION START TRANSACTION [ ISOLATION LEVEL { READ UNCOMMITTED | READ COMMITTED | REPEATABLE READ | SERIALIZABLE } ] [ READ WRITE | READ ONLY ] This command begins a new transaction. If the isolation level or read/write mode is specified, the new transaction has those characteristics, as if was executed. It is the same as the command. Refer to for information on the meaning of the parameters to this statement. This command conforms to the SQL standard; but see also the compatibility section of .