Transaction Behavior in isql
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When you start isql, InterBase begins a transaction. That transaction remains in effect until you issue a COMMIT or ROLLBACK statement. You must issue a COMMIT or ROLLBACK statement to end a transaction. Issuing one of these statements automatically starts a new transaction. You can also start a transaction with the SET TRANSACTION statement.
isql uses a separate transaction for DDL statements. When these statements are issued at the SQL> prompt, they are committed automatically as soon as they are completed. DDL scripts should issue a COMMIT after every CREATE statement to ensure that new database objects are available to all subsequent statements that depend on them. For more information on DDL statements, see the Data Definition Guide.