Heapspace Grenzen

Hallo,

ich habe hier eine Webanwendung unter Win2k Server, Tomcat7 und Java 1.6.31 laufen, die beim Kopieren einer Datenbank aussteigt: OutOfMemoryError: Java heap space

Die Argumente, mit denen Tomcat gestartet wird sind:

-Xmx1336m
-Xms512m
-Xss64k
-XX:MaxPermSize=256m

Nun habe ich versucht den -Xmx-Parameter höher zu setzen, mit dem Ergebnis, daß dann gar nix mehr geht (3 Beispielversuche):


[2012-08-30 08:27:52] [debug] ( javajni.c:660 ) Jvm Option[7] -Xmx3000m
[2012-08-30 08:27:52] [debug] ( javajni.c:660 ) Jvm Option[8] -Xms512m
[2012-08-30 08:27:53] [debug] ( javajni.c:660 ) Jvm Option[9] -Xss64k
[2012-08-30 08:27:53] [debug] ( javajni.c:660 ) Jvm Option[10]
-XX:MaxPermSize=256m
[2012-08-30 08:27:53] [debug] ( javajni.c:660 ) Jvm Option[11]
-Djava.class.path=D:\Programme\Tomcat7\bin\bootstrap.jar;D:\Programme\Tomcat7\bin\tomcat-juli.jar
[2012-08-30 08:27:53] [error] ( javajni.c:670 ) CreateJavaVM Failed


[2012-08-30 08:29:07] [debug] ( javajni.c:660 ) Jvm Option[7] -Xmx1536m
[2012-08-30 08:29:07] [debug] ( javajni.c:660 ) Jvm Option[8] -Xms512m
[2012-08-30 08:29:07] [debug] ( javajni.c:660 ) Jvm Option[9] -Xss64k
[2012-08-30 08:29:07] [debug] ( javajni.c:660 ) Jvm Option[10]
-XX:MaxPermSize=256m
[2012-08-30 08:29:07] [debug] ( javajni.c:660 ) Jvm Option[11]
-Djava.class.path=D:\Programme\Tomcat7\bin\bootstrap.jar;D:\Programme\Tomcat7\bin\tomcat-juli.jar
[2012-08-30 08:29:07] [error] ( javajni.c:670 ) CreateJavaVM Failed


[2012-08-30 08:31:59] [debug] ( javajni.c:660 ) Jvm Option[7] -Xmx1336m
[2012-08-30 08:31:59] [debug] ( javajni.c:660 ) Jvm Option[8] -Xms512m
[2012-08-30 08:31:59] [debug] ( javajni.c:660 ) Jvm Option[9] -Xss64k
[2012-08-30 08:31:59] [debug] ( javajni.c:660 ) Jvm Option[10]
-XX:MaxPermSize=256m
[2012-08-30 08:31:59] [debug] ( javajni.c:660 ) Jvm Option[11]
-Djava.class.path=D:\Programme\Tomcat7\bin\bootstrap.jar;D:\Programme\Tomcat7\bin\tomcat-juli.jar
[2012-08-30 08:31:59] [debug] ( javajni.c:844 ) argv[0] = start
[2012-08-30 08:31:59] [debug] ( javajni.c:891 ) Java Worker thread started
org/apache/catalina/startup/Bootstrap:main
[2012-08-30 08:32:00] [debug] ( prunsrv.c:1058) Java started
org/apache/catalina/startup/Bootstrap
[2012-08-30 08:32:00] [info] ( :0 ) Service started in 1468 ms.

(einzige Änderung war der -Xmx-Parameter)
Gibt es da irgendwelche Limits? Eine Suche nach "java heap space limit -Xmx" brachte mir nix erhellendes (außer daß in irgendwelchen Webforen Leute durchaus mit -Xmx2048m arbeiten konnten).
Wo könnte ich mit der Suche nach der Ursache für obiges Problem weitermachen?

Gruß

Werner
.

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