The BMS Server 2.0 allows historical data recording on a Microsoft SQL Server database. You can either use the Microsoft SQL Server Express instance that is installed along with the BMS Server 2.0 (named NETX_SERVER_SQL) or connect to any other Microsoft SQL Server instace instance locally or remotely. Use the config parameters in the BMS Studio under Server / System configuration / XDB.
The Microsoft SQL Server Express edition allows up to 10 GB database size (corresponding to roughly 90 million records), exceeding that size is not possible, even if your disk has space left.
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