> Do I understand right, that this L2 cache is doing exactly the same?

Indeed, part of the JDO1/JDO2 and JPA2 specs.

> Why is it not disabled by default (are there draw backs)?

It *is* disabled by default in DataNucleus 1.x. It is enabled by
default in DataNucleus 2.x (which GAE/J doesn't support still).

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