Sizing Log Streams for CICS Transaction Summary Records

This sample table sizes log streams for CICS transaction summary records:

RetPd Days	Avg Rec Length	Hourly Count	Total Byte Requirement	Max Dsns	4-KB Blocks	Cyls
7	150	4000	100,800,000	10	2,461	12
14	150	4000	201,600,000	14	3,516	17

Consider the following:

Hourly Count
Each CICS data collector writes a CICS Transaction Summary record for each unique transaction ID that executed during the system data collection interval.

If the data from multiple CICS regions get logged to the log stream, then this value must be the combined total for those CICS regions.
The above example assumes that the system interval is 15 minutes.
On average we are assuming that 100 unique transaction IDs execute during each interval.

It also assumes that 10 CICS regions are being logged to the log stream.

Hourly count = 100 * 4 * 10
The volume of this log stream should be low to medium.
The large amount of data can be maintained.