Operating System (OS)
Which is a permanent database in the general model of the compiler?

None of these
Source code
Literal Table
Identifier Table
Terminal Table

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Operating System (OS)
Backups should be done

weekly for most installations
daily for most installations
as several incrementals, followed by an image copy
None of these
as several image copies, followed by an incremental

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Operating System (OS)
Semaphores

are used to do I/O
synchronize critical resources to prevent deadlock
are used for memory management
None of these
synchronize critical resources to prevent contention

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