(ISTAT('DBSIZE'))
DBSIZE returns the size of the currently open database (total of the four database files). If no database is connected, ISTAT returns 0.
If you wish to check for a database size that is over 2 gigabytes you must use a data type which supports a larger number.
SET VAR vDatabaseSize DOUBLE = (ISTAT('DBSIZE'))
This is necessary because the default data type returned by the function, INTEGER, cannot hold the required number of digits to report over 2 gigabytes.
