Hi,

> What I mean is that the amount of memory consumed at any time by dbm (even
> in Embedded mode) should respect an "upper bound" or at least  knowable and
> predictable.

It is, if you specify it in the connection setting (A).

However if you don't (B), and it is set in the database, then there
are two cases:

- you do want to use the previous setting
- you forgot that it was set previously

The "automatic limit" only applies to (B).

> if we can
> know what's the used value  !

You can. But the point is, if you do want to use an explicit value,
then you need to set it each time you open the database.

>  Why not let this value to be dynamically adjusted based on the
> available memory in the JVM conservatively ?

That's what the automatic mechanism does.

> Thus if, on the dbm could use idle memory.

That's already available:
http://h2database.com/html/features.html#cache_settings

Regards,
Thomas

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