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Buffer

A data area, shared by hardware devices or program a process is called buffer. They are operated at different speeds or with different sets of priorities. The buffer allows each device or process to operate without holding up by the other. In order to a buffer to be effective, the size of the buffer needs to be considered by the buffer designer. Like a cache, a buffer is a "midpoint holding place" but does not exist so much to accelerate the speed of an activity as for supporting the coordination of separate activities.

This term is used not only in programming but in hardware as well. In programming, buffering sometimes needs to screen data from its final intended place so that it can be edited or processed before moving to a regular file or database.

Cache Memory

Cache memory is type of random access memory (RAM). Cache Memory can be accessed more quickly by the computer microprocessor than it can be accessed by regular RAM. Like microprocessor processes data, it looks first in the cache memory and if there, it finds the data from a previous reading of data, it does not need to do the more time consuming reading of data from larger memory.

Sometimes Cache memory is described in levels of closeness and convenience to the microprocessor. An L1 cache is on the same chip like the microprocessors.

In addition to cache memory, RAM itself is a cache memory for hard disk storage since all of RAM's contents come up to the hard disk initially when you turn on your computer and load the operating system that you are loading it into RAM and later when you start new applications and access new data. RAM also contains a special area called a disk cache that consists of the data most recently read in from the hard disk.

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โˆ™ 2011-03-30 19:14:20
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Q: Difference between buffer and cache
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The difference between buffer and cache?

Think of it like this - a "Buffer" is an area where data moves back and forth between two objects. A "cache" is where data is stored when it may not be immediately needed, but might be soon. A buffer is like a hallway between two rooms, and a cache is like a closet. Get it?


What difference between 32MB cache buffer and 64MB cache buffer?

A megabyte is a unit of information storage equal to 8,388,608 bits. The cache buffer is an area of extremely fast-access memory used by the processor, so the larger the area, the more data could take advantage of this speed. The "difference" between the two is self-evident.


Is Buffer cache is hardware entity?

I think No. Because buffer cache is a part of kernel and kernel is a software entity thats why buffer cache is also a software entity. However the buffer and the cache both are hardware entity separatly.


What problems do the cache solve?

Cache solve the transfer problems by providing a buffer of intermediate speed between the components


What is the difference between a concentrated buffer and a diluted buffer?

The concentration.


What is kept in the Database Buffer Cache?

Database Buffer cache is one of the most important components of System Global Area (SGA). Database Buffer Cache is the place where data blocks are copied from datafiles to perform SQL operations.


What are the difference between buffer stock and safety stock?

no difference


What is a buffer called when it is reading a ram or a drive?

Cache


What is the difference between a level 1 cache and a level 2 cache?

l1 cache is soldered on the printed ciecuit board l2 cache is plug-in type


What are difference between cache database and sql database?

CACHE is multidimensional and postconsonantal database and its supporting scripting


In computer parlance what is cache memory?

A Small, Fast Buffer


What is a data burst cache?

It term used to describe the typical 8, 16, or 32-MB of disk cache in the hard drive that acts as a buffer between the drive andcomputer system.

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