What is in-memory database? - Definition from WhatIs.com


in-memory database

Part of the Database glossary:

An in-memory database (IMDB, also known as a main memory database or MMDB) is a database whose data is stored in main memory to facilitate faster response times. Source data is loaded into system memory in a compressed, non-relational format. In-memory databases streamline the work involved in processing queries

An IMDB is one type of analytic database, which is a read-only system that stores historical data on metrics for business intelligence/business analytics (BI/BA) applications, typically as part of a data warehouse or data mart. These systems allow users to run queries and reports on the information contained, which is regularly updated  to incorporate recent transaction data from an organization’s operational systems.

In addition to providing extremely fast query response times, in-memory analytics can reduce or eliminate the need for data indexing and storing pre-aggregated data in OLAP cubes or aggregate tables.  This capacity reduces IT costs and allows faster implementation of BI/BA applications.

Three developments in recent years have made in-memory analytics increasingly feasible: 64-bit computing, multi-core servers and lower RAM prices. 


See also: big data analytics, association rules (in data mining), ad hoc analysis, unstructured data, data scientist, noisy data, descriptive modeling, opinion mining -sentiment mining, deep analytics


This was last updated in August 2012
Posted by: Margaret Rouse

Related Terms


  • structured data

    - Structured data contrasts with unstructured and semi-structured data. The three can be considered to exist on a continuum, with unstructured data being the least formatted and structured data being... (WhatIs.com)


    - SAP S/4HANA is the next generation of the Business Suite ERP platform, built on the SAP HANA in-memory platform. S/4HANA aims to be easier to use and administer to allow enterprises to solve more c... (SearchSAP.com)

  • MPP database (massively parallel processing database)

    - An MPP database is a database that is optimized to be processed in parallel for many operations to be performed by many processing units at a time. (SearchDataManagement.com)


  • Database

    - Terms related to databases, including definitions about relational databases and words and phrases about database management.

  • 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



    Contribute to the conversation

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