It Looks that most of the people are ignoring a very important that it is the amount
of I/O with a DBMS is doing. If for the same type of repeated operations i.e. adding
of UNIQUE records to a table with few lakh records is to be done then the faster DBMS
is the one which will require lesser I/O operations. And in my view Oracle is much
faster because of better disk caching it employs and I hope that this is the most
important factor.
Though query optimization also does help when there are complex queries.
Kapil Sethi
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