DISCONNECT

Closes a connection to a database.

DISCONNECT 
 Db  (Database Object)
Err (Indicator Variable | *EXTENDED)

Required . A Database Object defined with the DCLDB command.

Err

Optional. Determines what the runtime will do if an error occurs while executing this command. The following rules apply:

Err (Operand) - the name of the err variable.
Err (*EXTENDED) - a program status flag is set whose status can be checked using the %ERROR built-in function.
If the Err keyword is not given and an error occurs, a runtime exception will be thrown.

To open a connection to a database, use CONNECT.