A MultiValue file is a data storage structure created using Caché global variables. It is a fundamental part of MultiValue database architecture, corresponding to the UniVerse or UniData hashed data or dictionary file.
A MultiValue file is created using the CREATE.FILE verb. It is cataloged in the VOC file as a global variable, and can be concurrently accessed by multiple processes. You can use the FILEINFO function to determine the pathname of the global variable.
The OPEN statement opens a MultiValue file and returns the filevar local variable. This filevar is used for all subsequent MVBasic operations on this MultiValue file:
WRITE is used to write data to a MultiValue file.
READ is used to read data from a MultiValue file.
DELETE is used to delete a data record from a MultiValue file.
CLEARFILE is used to delete all data records in a MultiValue file.
CLOSE is used to close a MultiValue file, resetting filevar to null.
The FILEINFO function is used to determine the status of filevar and other information about a MultiValue file.