Problem choose method for save and retrive data

Hi
I want to conver sql database to berkeley db.my sql database has over that 40 tables and each table has diffrent fields (like varchar,int,...)and some tables have over that 30 fields .I want to use method that berkeleydbcorec pdf explain in chapter 3(Using C Structures with DB):
what is the limitation for use first method for store information?
I think only limitation is waste database.
what are the advantages of use (marshalling the data)?
if I use marshalling the data for store records does speed for fetch information reduce or not?
is it good use marsharling or first method for store information?
please help me.
regards,
saaed

Hi,
Since nobody else has posted anything I thought I would mention a couple of things:
Most applications that need a database need a way to work with records and fields. Berkeley DB does not have a schema so it is up to the application to format the data. Some databases through their DML make it easy to the application to look at fields but they are doing work for you behind the scenes.
Some dbms's if they support variable length fields store some information on the page to delimit fields. At run time there is some overhead in doing that as the dbmx needs to find the location on the page for the next field and so forth. So although the application may not have to write the code to obtain fields from records there still is the overhead in the database to do so.
As you noted in Berkeley DB, you do the marshalling and unmarshalling of data. Since you know your data best, you can optimize it as you see fit.
Perhaps you should try this on one table first and see what the performance is.
I hope this helps.
Ron

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