Default logging technique in H-Store

[priyagpssehgal]

Hi,
What is the default logging method in H-Store, if I do not enable "command logging" through site parameters.
Does the default logging technique try to place the log on disk? If yes, how often.

Thanks,
Priya

[apavlo]

I'm not sure what you're asking here?

H-Store now supports two different logging schemes: command logging (logical) and ARIES logging (physical). Command logging is turned on by default. ARIES has to be enabled at compile time:

http://hstore.cs.brown.edu/documentation/configuration/properties-file/site/#aries

[priyagpssehgal]

Thanks Andy.
Let me try to rephrase my question.

1. I compiled H-Store using default options/settings. Since command logging is on by default - it will get compiled.
2. I used the default "default.properties" file and ran TPCC benchmark. I got some throughput numbers., say x.,
3. Set site.commandlog_enable=true and rerun tpcc. For this experiment, I got the overall throughput number as say y.
4. I found that y < x. i.e., the performance of point no.3 is less than that of point no. 2.

My question is that, in case of point 2, when we do not explicitly set site.commandlog_enable to true, is there any kind of logging that happens? If yes, how? Note that, ARIES is disabled.
If no, then we can assume that no database recovery is possible ?

Thanks,
Priya