Overview of Disk Queue Size Calculation

A graphical representation that illustrates the sequence and flow of calculating data volume and queue disk usage.

Calculating Queue Disk Usage
Figure A-1 illustrates the sequence and flow of calculating data volume and queue disk usage. To calculate message size, you provide values for the number of sites, row width, primary key width, change in row width, parameter width, and message overhead which is a constant. To calculate inbound table and transaction volume, use the calculated value for message size with the values you provide for change rate and inbound transaction rate. From inbound table and transaction volume, derive inbound database volume Calculate inbound queue size from inbound database volume and what you provide for typical transaction duration. To calculate outbound table and transaction volume, use the calculated value for message size with the values you provide for change rate and outbound transaction rate. To calculate outbound queue volume, provide transaction volume, table replication selectivity, and the value obtained for outbound table and transaction volume. Calculate outbound queue size from outbound queue volume, failure duration, and save interval. Finally, with outbound queue size and the previously calculated inbound queue size, you will obtain total queue disk usage.
Parent topic: Data Volume (Queue Disk Space Requirements)