Statistics can help with problem determination and capacity planning, and make it possible to gain a snapshot of the current activity in CICS® Transaction Gateway.
Statistics can be displayed using the administration interface or retrieved using a program through the Statistics API. Statistical values reflect the status or activity of the Gateway daemon and the Client daemon from which they were collected. Statistical data for the Gateway daemon is based on Client applications that run in remote mode. Statistical data for the Client daemon is based on Client applications that run in both local and remote modes and use a TCP/IP or SNA server connection. No statistical data is available for Java™ Client applications that run in local mode. The collection of statistics has an insignificant impact on performance, and statistics are always available.
Interval and end-of-day statistics reflect those used by the CICS Transaction Server products to allow for synchronization of statistics collection between the products. Further information can be found from the Statistics parameters section of the CICS Transaction Server for z/OS® System Definition Guide.
Statistics resource groups are a logical grouping of resources such as connection manager threads, and represented by resource group IDs. A resource group ID is associated with a number of resource group statistics, each identified by a statistic ID.
A statistic ID is a label referring to a specific statistical value, and is used to identify or retrieve statistical data. The statistic ID consists of three parts: <resource group ID>_<statistical type><statistic ID suffix>. For example, the statistic ID CM_CALLOC is part of the connection manager (CM) resource group, and represents the current (C) number of allocated (ALLOC) connection manager threads. See List of statistics for a list statistic IDs arranged by resource group.
There are four statistical types: C (Current), I (Interval), L (Lifetime) and S (Startup). For more information, see List of statistics
The statistic ID suffix is the part of the statistic ID that follows the statistical type character. This suffix is usually a noun representing the particular characteristic of the resource group represented by the statistic ID. Similar characteristics that are shared by resource groups can use the same statistic ID suffix for consistency. For example, the suffix ALLOC is used in statistical IDs WT_CALLOC, CM_CALLOC, and CS_CALLOC.
CICS Transaction Gateway provides a mechanism to record interval, end-of-day data, and shutdown statistics data to a statistics log file. For more information, see Recording statistics to a file.