Should Servlet Engine do it or DatabaseEngine?

Question

Hi,
First I was doing the job in this way
1)select a,b,c from table where x=somevalue;
2)Then I was reading the value of a,b,c from the result set and storing them in variables(java variables),String s1,String s2,String s3.
3)Then I was feeding the data in javafunction to get the efficiency from method getEfficiency(s1,s2,s3)
4)So this sequence was going through out the result set.Now I am making oracle to give me the efficiency as I wrote the getEfficiency(a,b,c) in the oracle
Which of the cases will you recommend and why?Should the job be handled by servlet engine or by PL/sql engine,which one will give the results faster?If any one amoung you had found the difference in efficiencies please specify it,that will make the
understanding better.
thanks a lot
vicky

Answer 1

Hi,
I think that it should depends on several things.
1. the data amount in the result set.
if the data amount in the resut set is large, perhaps
you calculate the efficiency in the store procedure
and get the result would be faster. Basically,
the size of data of transimittion on the network
determine the performance.
2. algorithm
if the algorithm may be changed frequently or not,
if you are sure that it would not be changed, you
could put it in the store procedure; if not, I think
that put it in the application would be better. it
could be maintained easier.
3. database loading.
if the database loading is heavy, I think that you may
consider put method in the application. if it may
degrade the performance of database server. After
all , database server is not dedicate to that store
procedure.
But above points are interleaving in your case. you
may need to get the balance by different weight
for your need. I think that you need to do the tuning
task if it is worth doing so.
good luck,
Alfred Wu