Learn the correct command to refresh the LLA (Library Look-Aside) screen in mainframe systems. Discover the importance of LLA and how to effectively manage it for optimal performance.
Table of Contents
Question
What is the command used to refresh LLA screen
A. F LLA,REFRESH
B. F LLA,REFRESH ALL
C. F LLA,REF
D. None
Answer
The command used to refresh the LLA (Library Look-Aside) screen in mainframe systems is:
A. F LLA,REFRESH
Explanation
LLA is a facility in mainframe systems that maintains a directory of commonly used modules in a Virtual Lookaside Facility (VLF) dataspace. It improves system performance by reducing the I/O overhead associated with loading modules from DASD.
When changes are made to the libraries managed by LLA, such as adding, updating, or deleting modules, it is necessary to refresh the LLA directory to ensure that the system uses the most current versions of the modules. The “F LLA,REFRESH” command is used to perform this task.
Here’s a breakdown of the command:
- “F” is short for “MODIFY,” which is used to change the status of a system component.
- “LLA” specifies that the command is directed to the Library Look-Aside facility.
- “REFRESH” instructs LLA to update its directory with the latest information from the managed libraries.
It is important to note that “F LLA,REFRESH” only refreshes the modules that have been modified since the last refresh. If you want to refresh all modules managed by LLA, regardless of whether they have been modified or not, you can use the command “F LLA,REFRESH ALL.” However, this command should be used sparingly, as it can be more resource-intensive than the standard refresh command.
In summary, the correct command to refresh the LLA screen in mainframe systems is “F LLA,REFRESH.” By using this command when necessary, you can ensure that your system is using the most up-to-date versions of the modules managed by LLA, leading to better performance and fewer issues related to outdated modules.
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