Ans: Some UNIX systems don't clean up well after themselves. Inode problems and dead user processes can accumulate causing possible performance and corruption problems. Most UNIX systems should have a scheduled periodic reboot so file systems can be checked and cleaned and dead or zombie processes cleared out.

Ans: We can connect to Oracle from UNIX just by giving the command sql plus at the prompt and log into Oracle using the appropriate username and password.

Ans: This is the Kernel process that makes rooms for the incoming pages, by swapping the memory pages that are not the part of the working set of a process. Page-Stealer is created by the Kernel at the system initialization and invokes it throughout the lifetime of the system. Kernel locks a region when a process faults on a page in the region, so that page stealer cannot steal the page, which is being faulted in.

Ans: Nice value is the value that controls {increments or decrements} the priority of the process. This value that is returned by the nice () system call. The equation for using nice value is:
Priority = (? recent CPU usage?/constant) + (base- priority) + (nice value)
Only the administrator can supply the nice value. The nice () system call works for the running process only. Nice value of one process cannot affect the nice value of the other process.

Ans: The input from a pipe can be combined with the input from a file . The trick is to use the special symbol?-? (a hyphen) for those commands that recognize the hyphen as std input.
In the above command the output from who becomes the std input to sort , meanwhile sort opens the file log file, the contents of this file is sorted together with the output of who (rep by the hyphen) and the sorted output is redirected to the file new file.

Ans: Marshalling is usually required when passing the output parameters of a program written in one language as input to a program written in another language.

Ans: NTFS is a high-performance and self-healing file system proprietary to Windows XP 2000 NT, which supports file-level security, compression and auditing. It also supports large volumes and powerful storage solution such as RAID. FAT sys...  

Ans: Both are same. daemons are the background processes in unix.

similarly background processes in windows are called as service agents or service processes.

Ans: Grep is a string search command that parses the specified string from the specified file or files.

Ans: At the time when any process requires more memory than it is currently allocated, the Kernel performs Expansion swap. To do this Kernel reserves enough space in the swap device. Then the address translation mapping is adjusted for the new virtual address space but the physical memory is not allocated. At last Kernel swaps the process into the assigned space in the swap device. Later when the Kernel swaps the process into the main memory this assigns memory according to the new address translation mapping.