New FAQ Entry on JVM Parameters for Large Cache Sizes

I've posted a new [FAQ entry|http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html#60] on JVM parameters for large cache sizes. The text of it is as follows:
What JVM parameters should I consider when tuning an application with a large cache size?
If your application has a large cache size, tuning the Java GC may be necessary. You will almost certainly be using a 64b JVM (i.e. -d64), the -server option, and setting your heap and stack sizes with -Xmx and -Xms. Be sure that you don't set the cache size too close to the heap size so that your application has plenty of room for its data and to avoided excessive full GC's. We have found that the Concurrent Mark Sweep GC is generally the best in this environment since it yields more predictable GC results. This can be enabled with -XX:+UseConcMarkSweepGC.
Best practices dictates that you disable System.gc() calls with -XX:-DisableExplicitGC.
Other JVM options which may prove useful are -XX:NewSize (start with 512m or 1024m as a value), -XX:MaxNewSize (try 1024m as a value), and -XX:CMSInitiatingOccupancyFraction=55. NewSize is typically tuned in relationship to the overall heap size so if you specify this parameter you will also need to provide a -Xmx value. A convenient way of specifying this in relative terms is to use -XX:NewRatio. The values we've suggested are only starting points. The actual values will vary depending on the runtime characteristics of the application.
You may also want to refer to the following articles:
* Java SE 6 HotSpot Virtual Machine Garbage Collection Tuning
* The most complete list of -XX options for Java 6 JVM
* My Favorite Hotspot JVM Flags
Edited by: Charles Lamb on Oct 22, 2009 9:13 AM

First of all please be aware HSODBC V10 has been desupported and DG4ODBC should be used instead.
The root cause the problem you describe could be related to a timeout of the ODBC driver (especially while taking care of the comment: it happens only for larger tables):
(0) [MySQL][ODBC 3.51 Driver]MySQL server has gone away (SQL State: S1T00; SQL
(0) Code: 2006)
indicates the Driver or the DB abends the connection due to a timeout.
Check out the wait_timeout mysql variable on the server and increase it.

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    ==================================================================
    Thanks for your reply....................
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