Rockwell Automation RSBizWare Administration Guide - Manual (Page 271)

Data compression Appendix C
and compressed into a block of data that is then inserted into the
database as a single record.
The following user-readable summary information is included with
the block of data:
• An internal data point identifier.
• The time range covered by the compressed data.
• The maximum and minimum data point samples that were
collected.
• The number of data point samples that make up the
compressed record.
• The number of samples (if any) collected with bad OPC
quality.
Your individual compression ratio will vary based on several factors,
including the nature of the data being collected and transaction
parameters such as block size, sample rate, and signal type. For
example, steady state data will yield a higher compression factor than
random data. For this reason, it can be difficult to exactly predict the
compression ratio that you will realize.
The following compression ratios were observed based on system
testing with data point samples collected once a second, and with a
block size of 256:
Signal type Compression ratio
Steady State 15:1
Saw Tooth 7:1
Random 3:1
Compressed data can be graphed and viewed easily using time-series
report objects in an RSBizWare report. Depending on the time
Compression ratio
Viewing compressed data
Rockwell Automation Publication BZWARE-IN001M-EN-P-June 2014 271