Databases
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Postsdbo
PO
 

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    1. This table or related slice is empty.
    1. POHung JVM consuming 100% CPU
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    1. USStephen C
    1. USStephen C
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      1. VTUpMod
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    1. COI've rarely seen an unreponsive JVM with single-threaded, high CPU utilization be anything than the Garbage Collector in a panic. Garbage Collection logging will only provide you with confirmation of the collector behavior and an indication of the pattern of heap utilization, to determine the cause you'll need a heap dump and analyze with a tool such as Eclipse MAT (I've lost count of the number of times I've used a heap dump to find a difficult heap or application state issue, they really are invaluable).
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      1. USDanny Thomas
    2. COActually the GC logging was enabled at that time (we have it on by default), but unfortunately the gc.log file was overwritten when the application was restarted. We'll take care not to delete it next time this happens. I have tried to generate a heap dump out of the core file, but I didn't manage to do it as jmap complains it can't connect to the core file (I'm quite sure I specified the right executable - jsvc). An I agree with you, Eclipse MAT is pure gold! ;-)
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      1. USBogdan
    3. COAccording to this: http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html#cms.oom the JVM should throw an OOM error at some point if it can't make progress. In our case the JVM was hung for more than 10 minutes and no OOM was thrown. Isn't the fact that kill -3 doesn't trigger a thread dump strange? Or is the VM thread that I mentioned above the one responsible for dumping the stacktraces at the console and since it was so busy with GC-ing it didn't get to do it?
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      1. USBogdan
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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