OVDB 2.7.7 oddity (but in a good way).

[Jaye Mathisen]

I was having trouble with BerkeleyDB and INN and overview data.  Somehow
the database was getting repeatably corrupted, and when it wasn't
corrupted, ov writes were seeming to be a bottleneck.

So I dropped back to 64 files instead of 128, and bumped the cache size a
bit, and now it's running and has been running for several days with nary
a problem.

Same hardware and stuff, no changes except to the ovdb settings.

Also, instead of getting the wildly swinging overview times, they have
settled down to very stable/consistent numbers for the last few days.

In and of itself it doesn't mean anything, except if other people see the
same thing, perhaps a stronger "Don't touch these knobs and frobs unless
you know what you're doing" in the db config files would be warranted.



ov write   03:56:34.664  16.4%    1002612     1.550     14.158 3611.000


Which are much better than the 26000 ms times I was seeing with 128 files.