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does VIP functionality died with intro of SCAN in 11g r2? [message #434971]

Sat, 12 December 2009 07:47

janakors
Messages: 232
Registered: September 2009

Senior Member

hi,

i have some doubt about understanding of SCAN in 11g r2 and that is, if client request comes on SCAN in RAC enviornment(as shown in following tns entry)

test.world =
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST==apps-scan.world)(PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=R1211.world))
)

then what is the use of VIP then i.e we no longer use following in 11g r2 1.e

test.world =
(DESCRIPTION=
(ADDRESS_LIST=
(ADDRESS=(PROTOCOL=tcp)(HOST=apps001-vip.world)(PORT=1521))
(ADDRESS=(PROTOCOL=tcp)(HOST=apps002-vip.world)(PORT=1521))
)
(CONNECT_DATA=(SERVICE_NAME=R1211.world)))
)

so can any one explain what exactly SCAN do ? is it do load balancing or what i am really confused please guide

thanks

regards

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Re: does VIP functionality died with intro of SCAN in 11g r2? [message #434972 is a reply to message #434971]

Sat, 12 December 2009 09:01

Michel Cadot
Messages: 68756
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Where do you read that?
Post the link or quote an appropriate portion of the document you read.

Regards
Michel

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Re: does VIP functionality died with intro of SCAN in 11g r2? [message #434973 is a reply to message #434971]

Sat, 12 December 2009 09:02

Michel Cadot
Messages: 68756
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Or do you mean this following SCAN:

Quote:

single client access name (SCAN)

Oracle Database 11g database clients use SCAN to connect to the database. SCAN can resolve to multiple IP addresses, reflecting multiple listeners in the cluster handling public client connections.

Regards
Michel

[Updated on: Sat, 12 December 2009 09:03]

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Re: does VIP functionality died with intro of SCAN in 11g r2? [message #434980 is a reply to message #434971]

Sat, 12 December 2009 10:37

Michel Cadot
Messages: 68756
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Maybe these readings will help you:
Real Application Clusters Administration and Deployment Guide
Chapter 1 Introduction to Oracle RAC
Section Overview of Automatic Workload Management
Chapter 4 Introduction to Automatic Workload Management
Section Overview of Automatic Workload Management

Regards
Michel

[Updated on: Sat, 12 December 2009 10:37]

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Re: does VIP functionality died with intro of SCAN in 11g r2? [message #434983 is a reply to message #434971]

Sat, 12 December 2009 11:22

janakors
Messages: 232
Registered: September 2009

Senior Member

hi

well what u said is fine that clients connects to database through SCAN but what i am asking is what is the role of VIP.that is still there as VIP works like when one node get down and when connection comes on this down node VIP so it invaildate that connection and user get on other live node so this functionality still there
This is my question

regards and thank you sir

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