Problem with SQL,udfs & procedures

I have couple of problems with my database. Please suggest solution.
We are basically a web product With a Quite large Database
1. I am using functions both User Defined and Built in Functions in
SQL Statement. I want to optimize the query how do i do it.
why the usage of function in sql statements suppresses,the
usage of indexes internally. How to forceable make use of
the index even though function is used.
2. Whenver The Client makes a request to the Database server with a
Sql Query What are the steps we can take at the
client side to enhance the performance of the Query.
(i.e the Data Request ). How to optimize the usage of CPU at
client site?
3. what is the increase in the performance ration by having
separate table spaces for user data,system data and indexes.
4. Why the procedures are getting invalided
after some time. The procedure is
not getting executed at the front end.
Once the procedure is getting invalidated.
However even though the status of the
procedure is invalid the same is getting
executed at the back end.
Can anybody help me
Request for reply ASAP.
Regards
Koshal
null

1. In Oracle 8i, one can create function-based indexes, where instead of indexing a column, one can index upper() of that column.
2. Optimizing client performance is trickier. One can tune the queries being
submitted by the client, but if getting the first row back -- which is how response time is generally perceived -- set the OPTIMIZER_MODE parameter in init.ora to FIRST_ROWS.
3. There is minimal benefit to having data, index, rollback, and temp tablespaces all separated unless all the datafiles for each tablespace reside on different disks (data on disk 1, index on disk 2, etc). It's recommended regardless, but unless the files are on separate volumes, there won't be a great performance benefit.
4. A procedure is invalidated whenever DDL is issued against any object that that procedure depends upon. For example, if you add a column to a table, any procedures which reference that table will be invalidated. Any procedures which reference views which reference that table will be invalidated, because the view will be invalidated. It's best to run a compile script which looks for and attempts to recompile any invalid objects on a daily basis.
Adam

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Edited by: user10994305 on 19.05.2009 15:58
Edited by: user10994305 on 19.05.2009 15:58

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