Question : My Computer Missing Icon

I've recently bought a new computer - an ACER Aspire 5935G. I have a dual boot with XP and Windows 7. In both operating systems there is no icon for the DVD drive showing in My Computer.The other icons for partitions, etc are all visible and work normally.
How can I correct this situation?
Hoping someone can help!

Answer : My Computer Missing Icon

Dear Sakthi,

There is no rule of thumb in database performance tuning.  See this

Table1(col1,col2,col3) primary key(col1,col2)
Note behavior of each query listed below

sql>select * from table1 where col1=1 and col2=1
will may use primary key index(Index scan)

sql>select * from table1 where col1=1
will may use primary key index(Index scan)

sql>select * from table1 where col2=1
will may use primary key index (index Skip scan, but again this is depend)

To feel this create table with primary key and examine execution plan for different query.