Using the Response Time Information

To provide a picture of how a performance group was performing, SRM previously reported total transaction time for use in calculating standard deviation. This information is provided for transaction execution time. Response time distributions are provided for both service classes and report classes.

These distributions consist of 14 buckets of information. There is a header explaining the contents of the buckets that is provided once. The header contains the value of the particular bucket, which is a percentage of the specified goal (that is, 50 equates to 50% of the goal; 150 equates to 150%, of the goal) There is always one bucket which exactly maps to the specified goal, with a value of 100%.

In each bucket is the number of transactions that completed in the amount of time represented by that bucket.

In Figure 28, each of the fourteen buckets represents a percentage of the specified 1 second goal. For instance, bucket 2 represents all transactions that completed in 500 to 600 milliseconds, while bucket 8 contains the number of transactions that completed in 110% to 120% of the goal or 1.1 to 1.2 seconds. Notice that bucket 6 falls exactly on the goal. This bucket will capture all those transactions that complete in 900-1000 milliseconds.

The two end buckets have special meaning. Bucket 1 contains the total number of transactions that completed in up to 50% of the goal. Bucket 14 contains the number of transactions that completed in greater than 4 times the goal.

Figure 28. Self-defining response time distributions