Release 10.1C: OpenEdge Replication:
User Guide
Estimating network bandwidth
Calculating OpenEdge Replication’s effect on the network involves many different factors.
After-image data is the largest part in determining how much bandwidth will be needed. Exact data volume cannot be accurately calculated, as it depends on the type of transactions within the application and how much activity is going on against the database. However, it can be estimated if you know the average amount of after-image volume on your system. Use the following formula to help you calculate the values for capacity planning:
AID
The total size of all the after-image blocks
AIRM
The value 1.5, which is the multiplier for additional after-image notes due to Replication
AIDR
The number of after-image blocks with Replication
AIRO
The value 1.1, which is the multiplier for Replication overhead
AIDROP
The number of after-image blocks with Replication and overhead
(PRD)
The period of time, as follows:
Examples
- 1, if samples are 60 minutes and you want per-hour values
- 1/60, if samples are 60 minutes and you want per-minute values
- 24, if samples are 1 hour and you want per-day values
- 60, if samples are 1 minute and you want per-hour values
- 1/24, if samples are 24 hours and you want per-hour values
- 1/1440 (which is 24 * 60), if samples are 24 hours and you want per-minute values
Consider the following example, in which:
In this case, this customer would send approximately 146.85 megabytes of data to the target database per hour.
In the example that follows:
This customer would send approximately 422 kilobytes of data to the target database per minute.
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