002 - What is VIP & What is SCAN in Oracle RAC? || Real Application Cluster
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- čas přidán 6. 06. 2020
- Hi Friends,
Welcome you back on exciting topic, today’s session is on
Oracle RAC Internals - Real Application Cluster
The Oracle RAC Architecture - This is video uploaded on 06-Jun-2020.
VIP and SCAN - This is covered in this session.
VIPs and Networks
Listeners
SCAN
Listeners, SCAN and Services
Client Connectivity
Node Membership
The Interconnect
Installation and Upgrade
#VIP #SCAN #Network #RACArchitecture #RAC #Exadata #Oracle #Database
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Mallikarjun Ramadurg
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If anyone watches all ur RAC videos they can very easily clear interviews of 4 to 6 exp
Thanks Mallik for making best and easy videos of RAC
Super good resources to watch!
Thanks alot..really good job
Thanks a lot Sir, after a long time I got this useful video related to SCAN. You have cleared my all SCAN related doubts in RAC.
You are most welcome
Thanks, this is very detailed and easy to follow
Thank you. It's greatttttttttt.
Thank you for the clear explanation and easy way to simplify the complexity things in Oracle RAC structure.
Waiting for more CZcams videos.
Glad it helped you
Thanks very much...this is very useful vedio.
Thank you.
Awesome explaination
Glad you liked it
Thanks Mallik good explanation
Thank you @Naveen, Keep watching my channel and share with you friends.
Nice Explanation Mallik.
Thanks for liking. Please do watch my videos and share with your Oracle circles
All IPS should be under same sub net mask
Nice One
Thanks 🔥
Nicely explained 👍👍
Thanks for liking
Nice explanation
Thanks for liking
i have one question ..if we are adding more nodes into the cluster ..still do we need manually entry in the scan list for those nodes? or will it take automatically and put into the scan list
Hi Mallik,
Well explained. where scan ips are mentioned.
Hi Sir,
we have different nodes(in the sense instances) if request goes from node1 it fetches the data from database and where it will place the data,(in single instance it place in database buffer cache) in RAC it will place all the node's DBC or anything else.
Q.one instance goes down,DBC also goes down in this case no data present in that DBC.?
Hi Mallik,
Good one,
If we add or remove nodes from the cluster, how the SCAN gets updated about these details.
How to find the ips of SCAN in DNS/GNS.
Super explanation sir. I have queries??
You mention that before 11g vips are used for node connectivities. When SCAN got introduced from 11gr2 it resolves connections to the nodes. If SCAN is balancing node connectivity why do vip's divert node connectivities.
SCAN is for load balancing and HA but user session and application connection has to happen via your node VIPs not with SCAN IPs.
Hello sir, In this video at 9 min 30 seconds , you are saying the "VIP will be shifted to surviving node and the connection is also shifted to surviving node and the connection is still established to database.
I am sorry but please correct this statement, it is not true , The VIP will shift to surviving node but the existing connection will not shift to any of the existing nodes. the existing connection will disconnect, user has to establish new connection
Please refer the video on FAN and TAF. I have made one video on that where I have mentioned that you need to setup TAF and FAN so that all existing user or application connection will be shifted to surviving node.
Our of those user connected session only select statement will continue to execute but any DDL statement user has to resubmit the request.
If you still have doubt in understanding. feel free to call me I will explain you.
@@Mallik034 But let's say, We are connected to database using vip of node 1, and if that node goes down, then the vip will failover, but the user will get the timeout error .
great session only 1 query.
what's the point of having 3 scan ip if it is going to resolve connection in round robin fashion which can be achieved with 1 scan ip as well ?
It was the easiest steps taught by you sir to keep concept permanent in mind.
Thanks, Malik for a good explanation. What is the role of VIPs after the SCAN introduced in 11gR2.
@Gurpreet, VIP has many advantages.
1. Your local listener should run on VIP
2. You application should connect to database via SCAN and then node VIP.
3. Once node goes down your VIP will shift to other surviving node.
@@Mallik034 Thanks Mallik for clearing my doubt ☺
Most Welcome
2.Even after node addition or eviction on cluster from 11gr2 scan is balancing node connectivities. Then why again vip's are doing user connectivities to surviving node?? can you please let me know sir?
@@Mallik034 you're awesome man..really helps the explanation..👍🙏
How to configure SCAN ? Any video for that
sir please can you explain about split brain in oracle rac?
We can not have different subnet in case of public ips because the different subnets will not communicate each other and failover will not take place
Yeah thats true
Answer to your question is VIP and Scan ip should be in same subnet as your public ip
Different subnet is possible but same class of IP (public,virtual and scan).if i am not wrong please correct me...
Yes you are right.
Guess different subnets for different type of ips can be possible as it will anyway going to resolve the ips to the target system ip. Pl let me knw if this is correct.
That's true, we can have different subnets.
can ip number greater than 255 ? ......... in scan example i think u mistakenly expalined 192.168.1.300 ?
It was just example i gave.
IP address can not go more than 255 in case of IPv4.
If it is IPv6 then you can have IP more than 255 in one subnet