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Jstack Error – Not enough storage available

JStack is nice tool to print thread stack traces for a given java process. It comes to be very handy when analyzing high cpu usage problems. At times when executing this command you may encounter an error like I did 🙂

“Not enough storage is available to process this command”

It appears that on Windows Vista and later jstack doesn’t work because the command might be executed from a different user account then the one under which the jvm is running. The error doesn’t have anything to do with memory. So possible solutions to this are

  1. Run jstack under the same account as the jvm
  2. Use psexec to execute the jstack command like
psexec -s "%JAVA_HOME%\bin\jstack.exe" PID >stack.txt

Hope that helps !


Checking Oracle Client Version On Windows

As most of us know, an oracle client software needs to be installed on every machine which wants to connect to an oracle database server remotely. Oracle Client for 11g release 1 can be downloaded from here and the release 2 patch for windows can be downloaded from here.

There would be times when you want to verify the client version installed. Checking the about version popup of one of the configuration tools like Oracle Net Manager doesn’t help much since it doesn’t detail out on the patch version number.

The client version could be verified by executing SQL*Plus but depending on how the installation was done, this client tool may not be installed. Executing tnsping command seems to be sure-shot way to assert the client version since this tool is installed regardless of the install options chosen and this does not change with the release of Oracle client.

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