Some statistics pertinent to VTAM® internal performance activity and resource utilization are collected by VTAM application programs known as monitors. After a monitor obtains the data, it can report information to its user. Monitors are useful in providing:

• Tuning and resource information
• Early warning of problems in the VTAM system
• Information useful in debugging
• Information for monitoring current usage and trends
• Historical data for long-term analysis

VTAM offers the performance monitor interface to facilitate the requesting and receiving of this data by monitors. This method is independent of other data collection techniques provided by VTAM, and does not affect their use.

In this collection process, VTAM provides raw data to a monitor, which is then responsible for providing:

• The operator interface to the user
• The user report mechanism
• Data analysis functions
• The management of any statistical database