What is an Oracle Instance?
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What do you mean by a database transaction & what all tcl statements are available in oracle?
write a query to dispaly those name who is more than one in student table? example- in a student table sandeep kumar comes 4 times, rakesh kumar comes 2 times, ajit kumar comes 1 times so query will display sandeep kumar and rakesh kumar single times.
Define Normalization with example?
What is the cache hit ratio, what impact does it have on performance of an Oracle database and what is involved in tuning it?
What is snapshot is too old? Give and example for better understand.
What is literal?
How to define a data field as not null?
how do get database name at sql prompt?
What are steps required to ENTER DATA INTO DWH?
What is SGA ? How it is different from Ver 6.0 and Ver 7.0 ?
What is a Sequence ?
What is materialized view in Oracle?
Oracle General 
