Rockwell Automation RSBizWare Administration Guide - Manual (Page 269)

Appendix C
Data compression
The Time-series Data Compression Enterprise Connector stores
time-series data in a predefined compressed format in either an
Oracle or a Microsoft SQL Server database. The compressed data
point records contain binary data that can only be viewed through
the FactoryTalk Historian Classic application.
When an application such as FactoryTalk Historian Classic or
RSView32 collects and stores data in a database, it consumes
incremental storage space with each data record that is stored. For a
given storage medium (usually the database server’s hard disk), there
is a finite amount of data that can be stored. As a result, the user
must be mindful of the amount of stored data, the frequency of data
storage, and the size of the storage medium.
For example, assume that you have configured your FactoryTalk
Historian Classic application to collect and log data for 100 data
points from your control system every 10 seconds. The disk space
used after a year can be estimated as follows:
Without compression, after the amount of logged data approached
the disk capacity, the user would typically have to:
• Increase the total disk size by adding additional disk drives or
replace the existing disk with a larger disk.
• "Archive" the stored data to a backup medium (i.e., a tape
drive), freeing disk space for future logging.
Benefits of using the data
compression
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