Releases all resources used by a prepared dynamic SQL statement
    and prevents the prepared statement from executing again.

    The RELEASE statement is a dynamic SQL statement. Dynamic SQL
    lets programs accept or generate SQL statements at run time,
    in contrast to SQL statements that are part of the source code
    for precompiled programs or SQL module language procedures.
    Unlike precompiled SQL or SQL module language statements, such
    dynamically executed SQL statements are not necessarily part of a
    program's source code, but can be generated while the program is
    running. Dynamic SQL is useful when you cannot predict the type
    of SQL statement your program will need to process.