Oracle OCI JDBC Driver Not Recommended for Multiprocessor Machine

Sun's FAQ on java hotspot VM performance
(http://java.sun.com/docs/hotspot/PerformanceFAQ.html)
<http://java.sun.com/docs/hotspot/PerformanceFAQ.html)> 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. <http://java.sun.com/docs/hotspot/PerformanceFAQ.html>  

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

Thanks,  

Rick Stephenson

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Author: Rick Stephenson
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