On Tue, 16 Jan 2007, Heikki Toivonen wrote:
Andi Vajda wrote:
In version 4.5.20, Sleepycat (now Oracle), added support for
MultiVersion Concurrency Control (MVCC) to Berkeley DB.
I turned on --mvcc in the perf tests on January 11. For the most part
the changes according to our tests are really minor, +/- 2% usually.
The exception is the PPC Mac platform, which had large changes in two
tests. Subscribing to collection got about 15% faster, and publishing a
collection about 500% (!) slower.
Stability wise there does not seem to be a difference to running with or
without --mvcc.
A part from the PPC fluke, this could actually be good news. MVCC's supposed
to have an impact on concurrent transactions. If our tests have none then I
guess, it's still good news that it doesn't normally slow things down when not
in use.
Andi..
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