
	Home > Ask the Oracle Experts > Database Design and Architecture Questions & Answers > Understanding OPS, RAC and grid

Ask The Oracle Expert: Questions & Answers

EMAIL THIS

Understanding OPS, RAC and grid

EXPERT RESPONSE FROM: Brian Peasland

		Pose a Question

		Other Oracle Categories

		Meet all Oracle Experts
		Become an Expert for this site

Digg This!

StumbleUpon

Del.icio.us

QUESTION POSED ON: 07 June 2004
Could you please describe the differences among OPS, 9i RAC and 10g grid? I'm trying to understand where each one fits? Is 10g grid going to replace RAC?

EXPERT RESPONSE
Prior to Oracle9i, if you wanted to cluster multiple database instances together to access the same data, you would use a product called Oracle Parellel Server (OPS). Late in Oracle8i, the concept of Cache Fusion was introduced for OPS. Cache Fusion lets Oracle instances in the cluster send data back and forth to other instances without having to write the data to disk first. Having to write data to disk first was known as "disk pinging" and slowed down application performance. When Oracle9i was introduced, Oracle Corp renamed OPS to Real Application Clusters (RAC). This was due, in part, to Cache Fusion along with other improvements to the cluster software. Oracle10g still uses RAC in their documentation. But Oracle 10g's grid strategy relies heavily on RAC for its implementation. Oracle is not calling the software "grid." At this time, grid is more of a concept that uses Oracle software for its implementation.

Digg This!

StumbleUpon

Del.icio.us

RELATED CONTENT

	What's the difference between RAC and grid?
	Does Oracle grid rely on RAC?
	Grid or RAC?
	What is a cluster? What is RAC?
	Difference between cluster and grid
	Expert advice: Grid computing and Oracle10g
	Benefits, costs of running RAC

Database Design and Architecture

Oracle error 942 when exporting a schema

Using exp and imp for Oracle Database when switching platforms

Can I populate tables in MS ACCESS and upload to the Oracle server?

User vs. schema in Oracle

Is there any tool to migrate data from DB2 to Oracle?

Does making an Oracle datafile READ ONLY after a backup change the file?

I have space in log_arch_dest, so why am I getting the ORA-00257 error?

Why am I receiving the ORA-12535 error when using a remote database?

Partitioning a table in Oracle to improve performance

How to set up a job for an SQL query in Oracle 10g Grid Control

Oracle database design

Weighing remote database administration pros and cons takes care

Oracle Database 11g makes waves at Burlington Coat Factory

How to create a database link in Oracle

Data modeling tools no substitute for hard work

How do I do that in Oracle?

The Oracle Database user's guide to Oracle OpenWorld 2007

Oracle OpenWorld 2007 Special Report

How many redo log files?

How to move tables from system tablespace to user tablespace

ORA-12560 error with Oracle 10g Instant Client

RELATED GLOSSARY TERMS

Terms from Whatis.com − the technology online dictionary

extent (SearchOracle.com)

field (SearchOracle.com)

flexfield (SearchOracle.com)

foreign key (SearchOracle.com)

quad tree (SearchOracle.com)

record (SearchOracle.com)

row (SearchOracle.com)

splay tree (SearchOracle.com)

RELATED RESOURCES

2020software.com, trial software downloads for accounting software, ERP software, CRM software and business software systems

Search Bitpipe.com for the latest white papers and business webcasts

Whatis.com, the online computer dictionary

Search and Browse the Expert Answer Center
Search and browse more than 25,000 question and answer pairs from more than 250 TechTarget industry experts.

Browse our Expert Advice
Operating Systems IT Management Networking Database	Security Servers and Storage Applications and Development Career Center

SEARCH

TechTarget provides enterprise IT professionals with the information they need to perform their jobs - from developing strategy, to making cost-effective IT purchase decisions and managing their organizations' IT projects - with its network of technology-specific Web sites, events and magazines.


TechTarget Corporate Web Site \| Media Kits \| Reprints \| Site Map All Rights Reserved, Copyright 2003 - 2008, TechTarget \| Read our Privacy Policy