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When you configure your SQL Server databases, you can specify the maximum size of data files to prevent disk drives from running out of space. If you do not specify the size of data files, the database assumes that the size is unlimited.


NOTE: Unlimited data files can not initiate up.time alerts. Since up.time measures datafile and log file size as a percentage of their maximum size, if a datafile size has an infinite maximum size, the percent of maximum datafile size must be near zero. Therefore you should always set the maximum size of each datafile for effective monitoring.


The following diagram illustrates six data files in three filegroups in three databases across two instances of a system: