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
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Senior Member |
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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 #434983 is a reply to message #434971] |
Sat, 12 December 2009 11:22 |
janakors
Messages: 232 Registered: September 2009
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Senior Member |
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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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