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Grid Infrastructure Single Client Access Name (SCAN) Explained (Doc ID 887522.1)

Last updated on FEBRUARY 21, 2024

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.


11gR2 Grid Infrastructure (CRS) introduced Single Client Access Name (SCAN) to simplify client access to database services, this article is going to explain whats SCAN and how it works.


Intended audience will be DBAs who is installing/upgrading to 11gR2 Grid Infrastructure or support analyst who is supporting stated product.


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In this Document
 SCAN Concepts
 Common Questions Regarding SCAN
 How can we configure the SCAN and SCAN listener?
 Do we still need to configure local listeners on each node?
 How does SCAN work ?
 Instead of DNS or GNS, Can we use '/etc/hosts' to resolve SCAN?
 Can we use the previous method (Using VIP) for client connection?
 Is it mandatory to use SCAN?
 Is it supported to remove SCAN?
 Is it recommended to use COST feature?

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