Data log file sizes

Approximate disk usage for file sets:
  • Index file
    97 bytes file overhead, 1 byte for End of File marker, plus for each tag in the model
    TagName = 250 bytes
    TagIndex = 5 bytes
    DeleteFlag = 1 byte
  • Floating point log file
    289 bytes file overhead, 1 byte for End of File marker, plus for each tag in a record
    Date = 8 bytes
    Time = 9 bytes
    Millitime = 3 bytes
    TagIndex = 5 bytes
    Value = 8 bytes
    Status = 2 bytes
    Marker = 2 bytes
    Internal = 4 bytes
    DeleteFlag = 1 byte
  • String log file
    257 bytes file overhead, 1 byte for End of File marker, plus for each tag in a record
    Date = 8 bytes
    Time = 9 bytes
    Millitime = 3 bytes
    TagIndex = 5 bytes
    Value = 82 bytes This field is configured in the data log model.
    Status = 2 bytes
    Marker = 2 bytes
    Internal = 4 bytes
    DeleteFlag = 1 byte
Approximate disk usage for ODBC format files:
  • ODBC data log models need approximately the same amount of disk space as file sets, but this depends on the ODBC-compliant database that is used. The overhead may vary for each database.
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