Skip to main content

This is documentation for Caché & Ensemble.

For information on converting to InterSystems IRISOpens in a new window, see the InterSystems IRIS Migration Guide and Migrating to InterSystems IRIS, both available on the WRC Distributions pageOpens in a new window (login required).


Enable/disable writing to a non-existent file.


[Miscellaneous]    FileMode=n


The value n may be 1 or 0:

  • When 1 (true) and a file is opened for writing that does not exist, a new file is created.

  • When 0 (false) and a file is opened for writing that does not exist, a new file is not created unless the N parameter was provided with the OPEN command.

Suppose Caché encounters an OPEN command such as:

OPEN "file.x":"WS"

When FileMode=1 the new file is created automatically, even though the N parameter is not specified with the OPEN command. The result when FileMode=1 is equivalent to adding the N parameter to each OPEN command, so that:

OPEN "file.x":"WS"

is equivalent to:

OPEN "file.x":"WNS"

On the other hand, when Caché encounters an OPEN command and no N parameter is provided and the file does not already exist, then if FileMode=0 there is no result from the OPEN command except that the process hangs until interrupted.



Range of Values

0 or 1. The default value of FileMode is 0.

Management Portal

On the page System Administration > Configuration > Additional Settings > Compatibility, in the FileMode row, select Edit. Choose true (selected) or false (cleared).

FeedbackOpens in a new window