A_JAVA_GC_COUNT is a 32-bit value that determines how often the runtime calls the JVM garbage collector. The JVM garbage collector will run at unknown times, in order to deallocate memory which is no longer being used. Setting this to a non-zero value allows you to be a little more intentional about running the garbage collector. The value is the number of times C$JAVA is called before the runtime calls the JVM garbage collector. The default value is 9883, so every 9883 calls to C$JAVA will explicitly call the JVM garbage collector. (For more info on the JVM garbage collector, see your JVM documentation.)