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In a memory hierarchy system, data and programs are first stored in secondary or auxiliary memory. Program and its related data are brought in main memory for execution. What if the size of Memory needed for Program is more than the size of memory? Virtual memory is a idea used in some large computer systems which allow user to construct programs as though a large memory space were available, equal to total of secondary memory. Every address produced by CPU goes through an address mapping from so-called virtual address to a physical address in main memory. Virtual memory is employed to give programmers the illusion that they have a very large memory at their disposal although computer in fact has a relatively small main memory. A Virtual memory system offers a mechanism for translating program-generated addresses in correct main memory locations. This is done dynamically whereas programs are being executed in CPU. The translation or mapping is handled automatically by hardware through a mapping table.
Q. What is Single Program Multiple Data? A general style of writing data parallel programs for MIMD computers is SPMD (single program, multiple data) means all processors execu
How does the system handle roll areas for external program components? Transactions run in their own roll areas. Reports run in their own roll areas. Dialog modules run
What is Cursor? Cursor is a database object used by applications to manipulate data in a set on a row-by- row basis, instead of the typical SQL commands that operate on all the
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Q. What do you understand by Scan Codes? A scan code is a code produced by a microprocessor in keyboard when a key is pressed and is unique to key struck. When this code is rec
EPROM contents can be erased by exposing it to ? Ans. By exposing EPROM contents to Ultraviolet rays, it can be erased. The Ultraviolet (UV) light passes throughout a window i
Explain Macro definition and call. Macro: The assembly language programming frequently finds this necessary to repeat certain piece of code several times during the course of
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What are pages? All programs and date are composed of fixed length units known as pages. Each page consists of blocks of words that occupy contiguous locations in main memory
Processes of Information System The basic purpose of the Information System is to convert and manage data into something that is meaningful. Bocij et al (2003) lists the basic
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