Re:Strangeness with PL/SQL and ProC

Lee,

    Stop a minute and take a look at what your doing. I assume that when the process was pure PRO*C there must have been a pile of communication between the database and the program. This communication, even if done by IPC takes time. Now when you re-code it in PL/SQL there is no reason for process to database communication, hence it takes less time. Allow me to provide an illustration:

    We had a OCI program that would load tester data from NT shares every morning into our Unix based database. Normally this process took around 8 to 10 hours to run. When MicroSoft OS/2 died several years ago yours truly ported the program from OS/2 to NT in the process re-coding it in PRO*C. Now since paramaterization of SQL was not the original authors forte, the program started running a little faster, but still 6 to 8 hours. Now comes Y2K, a new server & database evrsion & some normalization takes place resulting in a new database design. When I reviewed the program I note that there were a number of back and forth communication requirements that were in the original. It took something like 5 round trips to the database for queries to decide if we were going to insert a new record or update an existing one. Well, I took all of that code out of PRO*C, re-coded it as a PL/SQL package and today that same program runs in a little over 1 hour with one round trip from the client to the database.

Dick Goulet

____________________Reply Separator____________________
Author: Robertson Lee - lerobe <lerobe_at_acxiom.co.uk>
Date:       3/8/02 2:03 AM

> Oracle 8.0.5.0.0
> Tru64 4.0f
>
> We have a process running here and without going into the detail of it we
> have a Pro C program that is taking ages to run updates and selects (2
> hours to do 10000 records). The program was changed to PL/SQL and we
> suddenly were seeing 5 million records processed in 1 hour.
>
> Is PL/SQL that much faster than Pro C. Can somone more in the know give
> me some hints ??
>
> TIA
>
> Lee
>
>

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