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RE: Oracle OCI JDBC Driver Not Recommended for Multiprocessor Mac

Date: Thu, 03 Apr 2003 09:08:56 -0800
Message-ID: <>

Rick - In Java Programming for Oracle by Don Bales, he ran some comparative tests showing the comparative advantages of each interface under different circumstances. H
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Dennis Williams
DBA, 40%OCP, 100% DBA
Lifetouch, Inc.

-----Original Message-----

Sent: Thursday, April 03, 2003 10:44 AM
To: Multiple recipients of list ORACLE-L

The performance of JDBC OCI vs Thin really depends on what you are trying to do. Thin driver can perform better
than OCI and in some situations doesn't. Also there are limitations in Thin driver such as you can't return
a PL/SQL table using Thin driver, you can't do TAF etc.  

Richard Ji

-----Original Message-----

Sent: Wednesday, April 02, 2003 12:14 PM To: Multiple recipients of list ORACLE-L

I've gone to using the thin driver exclusively, as (counter-intuitively, I know) it performs better than the OCI driver. Plus it's easier to port...

-----Original Message-----

Sent: Wednesday, April 02, 2003 7:29 AM
To: Multiple recipients of list ORACLE-L

Sun's FAQ on java hotspot VM performance ( <> includes this interesting question:  

BM_24My application uses a database and doesn't seem to scale well. What could be going on?

Oracle provides two types of database drivers: a type-2 driver, called the OCI (Oracle Call Interface) driver that utilizes native code, and a type-4 pure Java driver called the thin driver. In single processor environments, the thin driver works somewhat better than the OCI driver because of the JNI overhead associated with the OCI driver. On multi-processor configuations, synchronization points within Solaris used by the OCI driver become big bottlenecks and prevent scaling. We recommend using the thin driver in all cases. <>  

Is this actually the case? Does anyone have more information on this?  


Rick Stephenson

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Received on Thu Apr 03 2003 - 11:08:56 CST

Original text of this message