online defragmentation

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 applicatio

use DBCC INDEXDEFRAG to organize index fragmentation, and the second is to use DBCC DBREINDEX to rebuild the index. Each has its advantages and disadvantages.The following words are called Microsoft:The DBCC indexdefrag command is an online operation, so the index is available only when the command is running and can be interrupted without losing the completed work. The disadvantage of this approach is that the drop/re-create operation without a clus

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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How does the Win7 system turn off the automatic defragmentation service? This article mainly introduces the Win7 system as the column, tells the manual turn off the computer automatic defragmentation service The tutorial, needs the friend to turn off the automatic defragmentation service under the reference. 1, click on the Windows Start icon, click on the Contr

When we are in the WINDOWS10 system because of the continuous downloading and deletion of the job, the disk slowly appear in the so-called "fragmentation", time is long, will cause the disk's access efficiency will decline. At this point, we can use the system with the "disk defragmentation" function to detect maintenance! So how do you use disk defragmentation in the WIN10 system? The following small serie

The vast majority of computer users are using the Windows system, we all know that when the computer is slow to use, one of the ways is disk defragmentation, but in the Linux system, there is no disk defragmentation of this feature, why do not need disk defragmentation Linux? This is because Linux and Windows file systems work differently.

Content feed: The presence of the Hiberfil.sys file will make the system unable to complete a full defragmentation of the disk, this article describes how to delete the Hiberfil.sys file before defragmenting. Many Windows XP users are now accustomed to using the system-provided hibernate function, because this eliminates the time of the switch and can be restored directly to the original working state each time it is turned on, such as an article tha

lot of space for the disk, and its ultimate goal is to make the operating system cleaner and more stable. 　Disk defragmentation: Files are distributed to different places throughout the disk, rather than being kept on disk continuously. When the application requires insufficient physical memory, the normal operating system generates a temporary swap file on disk that uses the disk space used by the file to be virtual into memory. Virtual memory man

defragmentation is complete, use the command mount-database–identity test01 or load the database using the Exchange EMC graphical interface. A full data backup of the database is recommended immediately after the database is loaded properly.Attention1, use the command eseutil/d to defragment the database requires special attention, the command is not a last resort, do not use. If the database object that you need to defragment is a replica in the DAG

Label:Database in the daily use of the process, continuous insert,delete,update operation, resulting in the table and index fragmentation is inevitable, fragmentation is more, SQL execution efficiency naturally poor, the reason is very simple, high watermark (HWL) Many data blocks are no data, But the full table scan to scan to the high watermark data block, that is to say Oracle to do a lot of useless! As a result, Oracle provides shrink space defragmentati