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Your graph shows a pretty significant jump in latency, and it's not something that we expect.
Would you happen to have, or could you get, a sampling of BDB environment statistics when this happens? You'd get these by making periodic cals to Environment.getStats , being sure to set StatsConfig.setClear(true) so you get interval statistics. The stats can also be obtained via JConsole if you have the JMX mbean enabled, as specified in http://download.oracle.com/docs/cd/E17277_02/html/jconsole/JConsole-plugin.html.
Cache miss counts are usually the first thing we look for, when we see performance changes like this. The stats would provide a starting point to start understanding the difference in behavior.