What is cold start in CICS?
START=COLD performs a dual type of startup, performing a cold start for all local resources while preserving recovery information that relates to remote systems or resource managers connected through the resource manager interface (RMI).
What is the difference between warm start and cold start?
Warm start A warm refers to somewhere between a cold and hot start where some of the operations that take place in a cold start are still happening. This makes it faster than a cold start but still with more overhead than a hot start.
How do I start my own CICS?
You can start CICS in one of two ways:
- Use the MVS™ START command to start CICS as a started task.
- Submit a CICS batch job to the MVS internal reader.
What else will dictate the type of start that CICS will perform?
When CICS is started, the type of startup (and therefore the actions it takes) depends primarily on the following:
- The value of the START system initialization parameter.
- Two records in the CICS global catalog: The recovery manager control record. The recovery manager autostart override record.
What temperature is a cold start?
What Temp Is Considered A Cold Start? The initial engine operation when the working temperature drops below normal is regarded as a cold start. In the case of internal combustion engines, for example the piston compresses air at very cold temperatures -20c, to reach a temperature that causes it to ignite.
What is warm start?
Warm Start: Warm start refers to restarting the CPU without turning the power off, Program processing starts once again where Retentive data is retained.
Why is a car loud at cold start?
When it is cold, more fuel is added to the air/fuel mixture to make up for the lack of natural vaporisation. So the AFR (air-fuel ratio) is seen by the ECU to be leaner than usual (below the Stoichiometric ratio of 14.7:1) so it compensates for this with extra fuel to make up for the unburned fuel due to the cold.
How do I start a CICS transaction from JCL?
Using JCL to initiate CICS commands
- Edit your JCL to use the MVS command MODIFY.
- Follow the MODIFY command with the job name or task ID of the CICS region you are addressing, followed by the CICS commands.
- Submit the JCL. The following sample job shows how you might submit commands in this way.
What does CICS stand for?
Customer Information Control System
CICS® stands for “Customer Information Control System.” It is a general-purpose transaction processing subsystem for the z/OS® operating system.
Why do cold starts sound better?
Ideally, efficient combustion occurs at a higher temperature than that of the ambient temperature of a cold engine, where the fuel can vaporise naturally and be burned. When it is cold, more fuel is added to the air/fuel mixture to make up for the lack of natural vaporisation.
How does CICS work on a warm start?
CICS always restores the trace domain according to the system initialization parameters, and can restore other facilities depending on the COLD option of their associated system initialization parameters. For more information, see CICS actions on a warm start.
What is a cold start in CICS?
CICS starts with limited reference to any system activity recorded in the CICS global catalog and system log from a previous run of CICS. For more information, see CICS actions on a cold start.
What are the different types of start in CICS?
When selecting the type of start (using the START system initialization parameter), the choices are INITIAL, COLD, or AUTO. AUTO can result in a warm or an emergency restart; CICS itself determines which to use.
What is the use of autostart in CICS?
CICS starts, after an abnormal shutdown, restoring recoverable resources to their committed states. For more information, see CICS actions on an emergency restart. The value of the START system initialization parameter The recovery manager autostart override record.