Operating system waits
You should avoid using facilities that cause operating system waits. All CICS® activity stops when one of these waits occurs, and all transactions suffer response delays.
The chief sources of operating system
waits are:
- Extrapartition transient data sets. (See Efficient sequential data set access.)
- Those COBOL, C, C++, and PL/I language facilities that you should not use in CICS programs and for which CICS generally provides alternative facilities. For guidance information about the language restrictions, see Developing COBOL applications, Programming in C and C++, and Developing PL/I applications.
- SVCs and assembler language macros that invoke operating system services, such as write-to-operator (WTO).