Part of the Backup and recovery glossary:

Write through is a storage method in which data is written into the cache and the corresponding main memory location at the same time. The cached data allows for fast retrieval on demand, while the same data in main memory ensures that nothing will get lost if a crash, power failure, or other system disruption occurs.

Although write through minimizes the risk of data loss, every write operation must be done twice, and this redundancy takes time. The active application program must wait until each block of data has been written into both the main memory and the cache before starting the next operation. The "data insurance" therefore comes at the expense of system speed.

Write through is the preferred method of data storage in applications where data loss cannot be tolerated, such as banking and medical device control. In less critical applications, and especially when data volume is large, an alternative method called write back accelerates system performance because updates are normally written exclusively to the cache, and are backed up in the main memory only at specified intervals or under certain conditions.

This was last updated in July 2012
Contributor(s): Stan Gibilisco
Posted by: Margaret Rouse

Related Terms

Definitions

  • automatic backup

    - Automatic backup, sometimes known as dark backup, is the replication of data through software that performs backup tasks without human interaction. Because data can be lost through equipment failu... (WhatIs.com)

  • backup software

    - Backup software is any one of various types of software used to make duplicate copies of data to safeguard it. Without regular backup, data stands to be lost quite easily. Both conventional hard d... (WhatIs.com)

  • agentless backup

    - Agentless backup is the replication of data that is performed without the use of a service, daemon or process (AKA an agent) running in the background to facilitate the process. Access may be condu... (WhatIs.com)

Glossaries

  • Backup and recovery

    - Terms related to backup and recovery, including definitions about making copies of data and words and phrases about restoring original data after a data loss event.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.