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1.

NVL Function in SQL Oracle or MySql

Answer» NVL() FUNCTION is available in oracle only and do the same operation as ISNULL Function in SQL and IFNULL unction in MySql. This is basically used to check the Null values in the table coloumn
Discussion
2.

what is i in 9i G in 11G and C in 12C in oracle

Answer»

what is i in 9i G in 11G and C in 12C in oracle
There are not some specific meaning for that but below are some COMMON meanings.
(1)I means INTERNET
(2)G means Grid
(3)C means Cloud
Discussion
3.

What is Clusterware

Answer»

What is CLUSTERWARE
These are the software that provides various INTERFACES and services for a cluster are called Clusterware.
(1)This allow the cluster to be managed as a whole
(2)This also protect the integrity of the cluster
(3)This maintain a registry of resources across the cluster
(4)This will also deal with CHANGES to the cluster
(5)This provide a COMMON view of resources
Discussion