List the type of locks and explain each of them.
There are primarily three types of locks:
- Shared lock - The shared lock allows two or more programs to be read from the locked space itself but it does not allow the viewer to modify it
- Update lock - It is a relatively more lenient type of lock, it slows the program to be read and it can also be modified
- Exclusive lock - As the name states, it restricts any user to access the locked space and its contents
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