Offline archive utility processing

During processing, the offline archive utility makes two passes through the input archive file:

• On the first pass, the utility:

  • Finds every record that contains valid data within the specified time range, and adds them to a sorted list.

  • If required, converts point IDs using the specified conversion table.

  • Issues an error message for every record that does not have a corresponding point in the local Data Archive server. You can suppress these messages, if desired.

• During the second pass, the utility:

  • Creates the output archive file, if it does not already exist, and initializes the archive header based on command-line specifications.

  • Filters or modifies the input data, if necessary, and writes all records from the sorted list to the output file.

The offline archive utility displays statistics approximately every five seconds, at the end of the first pass, and at the end of the second pass.