Estimating Migration Time

Migrating a large historical database from either Advanced or Classic Historian into Historian may take hours or days, depending on the size of the database and the processing power of your machines.

To estimate migration time, refer to the total file size of the migration files. For Classic Historian migration, it takes approximately one minute to migrate 3 to 8.3 MBs of data. For the quickest migration, it is recommended that you clear the Migrate Current Alarm and the Readback Values option, if they are not required, in the Classic Historian Migration Options window.

For Advanced Historian data, it takes approximately 30 minutes to migrate 100 MB of data. This estimation assumes a default throttling of 10,000 events per second. If you have modified your Max Values/sec field in Advanced Historian, your migration time may vary. For more information, refer to Limit Processing Load on Server During Migration.

Note: In addition to migration file size, migration time depends upon the processing power of the computer running the migration utility. It is highly recommended that you select a computer with high processing power to run the migration program.

Alarm migration performance is bounded to the CPU power of both the migrating machine and the alarm archiver machine.