The CANCEL_ALL_DLLS configuration variable is used to change the default behavior of a CANCEL
ALL statement. The default behavior is for CANCEL ALL to free all DLLs loaded
with a prior CALL statement. Setting CANCEL_ALL_DLLS to "0" (off, false, no) indicates that CANCEL ALL should not free any
DLLs. If you want to free a particular DLL when CANCEL_ALL_DLLS is set to "0", you must specify the DLL's name in a CANCEL statement.
The default value of CANCEL_ALL_DLLS is "1" (on, true, yes).