Discover the three main types of JES2 starts in mainframe systems: cold, warm, and quick. Learn about their differences and when each type of start is typically used.
Table of Contents
Question
Which of the following is the type of JES2 start
A. QUICK
B. COLD
C. WARM
D. ALL
Answer
D. ALL
Explanation
In mainframe systems, there are three primary types of JES2 (Job Entry Subsystem 2) starts:
- Cold Start: A cold start is performed when JES2 is started for the first time or after a system failure. It initializes all JES2 data structures, deletes all jobs in the system, and clears all queues. This type of start is the most time-consuming and is typically used when there is a need to completely reset the JES2 environment.
- Warm Start: A warm start is the most common type of JES2 start. It preserves most of the system status and job information from the previous JES2 session. During a warm start, JES2 reloads the job queue and output queue from the checkpoint dataset, allowing jobs to continue processing from where they left off. This type of start is faster than a cold start and is used when there is a need to restart JES2 without losing job information.
- Quick Start: A quick start is similar to a warm start but is even faster. It assumes that the JES2 environment is intact and does not perform extensive validity checks on the checkpoint dataset. This type of start is used when there is a need to quickly restart JES2, and the system is known to be in a stable state.
In summary, the three types of JES2 starts – cold, warm, and quick – offer different levels of initialization and preservation of system status, catering to various scenarios in mainframe systems.
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