defragmentation definition

After a hard disk has been in use for a period of time, the free sectors on the disk are dispersed to the discontinuous physical locations throughout the disk because of repeated writing and deletion of the file, thus making the file unable to have contiguous sector classes. In this way, read and write files need to go to different places, to increase the head movement back and forth, reducing the speed of disk access. The hard drive is like a house that needs to be sorted more often, to defragm

basis (e.g., once a month). The Disk Defragmenter module currently provided by Windows Optimizer can analyze local volumes, defragment files, and folders so that each file or folder can occupy separate and contiguous disk space on the volume. This allows the system to access files and folders more efficiently, and to save new files and folders more efficiently. By merging files and folders, Disk Defragmenter also merges the free space on the volume to reduce the possibility of fragmentation of

For large DBMS systems like Sybase, the cornerstone of an OLTP (online transaction processing) application is that it needs to run uninterrupted 365 days a day, 24 hours a year. Because of the large number of inserts, updates, deletes and so on of the database on a daily basis, the storage fragmentation is generated on the physical storage media of the database, which affects the efficiency of the storage and the speed at which the database application runs. Can you defragment these fragments, j

If you are using a Windows XP operating system, be aware of disk defragmentation issues. 1. Why do you need to defragment? File layouts on disk strongly affect I/O performance, and files and directories that are heavily fragmented or scattered on disk can compromise performance, although Windows XP automatically redirects certain files to improve performance, but typically this is not part of the system's required routine. And usually contains only

People in the process of using the Win7 system will encounter a lot of questions about the system, this time you need to develop a Win7 disk defragmentation plan, so as to ensure the normal operation of the system, first of all, you need to base on this Win7 disk defragmentation knowledge. Windows7 system Win7 Disk defragmentation software for your system

The following content reproduced from: http://forum.ubuntu.org.cn/viewtopic.php?t=27451 The idea of defragmentation is mainly among two types of friends, one is the friend affected by Windows, and the other is a friend who has a certain degree of understanding of the principles of the operating system.Let me briefly explain some of the issues here.All operating systems generate disk fragmentation, which is why some friends have doubts. This fragment

Disk defragmentation is the Disk Cleanup optimization tool with Windows, when the computer does not install other optimization software, you can directly use Disk Cleanup to solve the miscellaneous files in the hard drive, to ensure the life of the hard disk, but also to improve the operating efficiency of the computer machine. But in the Win7 system, there are many partners want to know that SSD solid-state hard disk cleaning? Here is a small weave t

In today's computer systems, disk defragmentation is ubiquitous, and disk defragmentation is the removal of disk-fragmented files by cleaning up the disk's junk files to free up more disk space and faster disk speed. If you're using a Win7 system, you don't have to look for a third-party defragmentation software, because the Win7 system itself has a disk

If you are a Linux user, you may hear that Linux file systems do not require defragmentation. You may also notice that the Linux distribution does not have the ability to defragment the disk. What is this for?To understand why Linux file systems do not fragment like Windows ' file systems, you first need to understand how fragments are generated, and how the file systems of these two operating systems work differently.　　What is disk fragmentation?Many

Windows 7 with simple design, fast operation of the operating system quickly occupied the market, but you have not found that in the system running for a long time, the rapid operation of the Win7 also seems to be bored in general, the speed slowly down. The reason, most likely is that the computer in the fragmentation of the hard drive running speed down. The Windows operating system has the ability to defragment the disk, but it is only the impression that the previous Windows operating syste

Disk defragmentation is an operation that we often use when we operate a computer. Disk defragmentation is the removal of disk-fragmented files by cleaning up the disk's junk files to free up more disk space and faster disk speed. Now most people are using the Win7 system, where is the disk Cleanup of the Win7 system? How do I clean up disk fragments? Now go with the little ones to see where the Win7 Disk C

oracle| Data | Database defragmentation http://www.computerworld.com.cn (2001-05-14 11:15:01) We know that Oracle, as a large database, is widely used in finance, post and telecommunications, Electricity, civil aviation and other The data throughput is huge, and the computer network is widely popular in the important department. For system administrators, how to To ensure the stable operation of the network, how to improve the database performance, ma

For older players, the word "Disk Defragmenter" must be a stranger. As a built-in windows for the hard disk and other storage devices to defragment the tool, to some extent, reduce the hard disk miscellaneous files piled up, speeding up the speed of disk operation, thereby enhancing the overall speed of the computer. This promotion for some poor performance, the use of mechanical hard disk of the old host, is still particularly valuable. However, to the solid state hard drive happy enclosure, t

method of Win7 system using defragmentation to solve disk failure problem The specific methods are as follows: 1, the failure of the situation you will often encounter, similar to the self-test; 2, click the Start menu to select All Programs; 3, click the Attachment menu bar, select the inside of the System tool column; 4, click the Disk Defragmenter program to open the program; 5, find the disk yo

exists in the array Key--Get the key name from the associative array Krsort--Reverse order of array by key name Ksort--sorting arrays by key name List--assigns the values in the array to some variables Natcasesort--Using the "natural sort" algorithm to sort the case-insensitive letters of an array Natsort--Using the "natural sort" algorithm to sort the arrays next--Move the inner pointer in the array forward one POS--The alias of current () prev--Returns the internal pointer of the array back t

1, what is the use of disk defragmentation, then we first understand what disk fragmentation, the disk is like a large warehouse, which has many many rooms, and our files are like goods, may download 2 movies today, occupy 2 rooms, and delete one, only occupy a room, in download a very big game, The game will be empty room full use, such a complete game file in order to separate a film in the space, repeated deletion of the download on the formation o

paging:After paging:And when paging, if the new page and the current page are physically discontinuous, it can also cause external fragmentationImpact of internal fragments and external fragmentation on query performanceThe impact of external fragmentation on performance as stated above, it is mainly due to the need for more cross-region scanning, resulting in more IO operations.Internal fragmentation can cause data rows to spread across more pages, aggravating the scanned page tree and reducin

Optimize table statement to defragment the demo table just now.Defragmenting the demo tableThen we'll check the demo again. MyD file, we will find the demo at this time. The size of the MyD file has been reduced to about 3/5 of the original.Defragment the demo after the defragmentation. Size of the MyD fileNote: 1.MySQL It is recommended that you do not defragment regularly (hourly or daily), usually on a weekly or monthly basis, depending on the act

1. When defragmenting the disk, "Disk Defragmenter detects that CHKDSK is scheduled to run on Volume: Data (E:), run Chkdsk/f", in which case the defragmentation is not allowed. 2, open My Computer, right-click on the appropriate partition, find the properties, and then click Disk Cleanup. Then tick the two items and click OK. 3, but the situation has not been resolved, once again found in the attribute tool, and

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