RTX HDB User Applications

Real Time eXecutives, Inc.

RTXHDB - Lite Historical Database

RTXHDB - Lite is an extremely efficient database using the 'flat file' model in which historical values are typically stored time-sequentially in 4-byte floating-point format. RTXHDB - Lite uses a separate file for each variable's historical data; the name of the file is derived from the variable's index in an 'Index File'. Name lookup simply uses an Indexed Sequential Access Method (ISAM); typical of any indexed database. The power of the flat-file database comes from the fact that values are stored in a time-sequential fashion so that access of a value at a particular time requires a simple calculation of the value's location in its data file. From that file position, a single read retrieves time-sequential values. The result is extremely fast access of large volumes of data. ( 1000 Tags/RTXHDB Database )





  • Windows NT 4.0 / 2000 Server / XP Pro
  • Windows 2000 Server / XP Pro

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