Re: Exchange transactions - I'm confused!

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On 22 Dec 2005 09:39:20 -0800, "Mark (News)" <news@xxxxxxxxxxxxxxxxxx>
wrote:

>No one interested? :(
>
>Well, I did some more testing - 3 tests. On a system with about 80,000
>used jet pages, with very very low load (i.e. no users at all), there
>were no bad page links when the log files were blown away. When the
>usage was increased to low usage (10 low use users) there were 16 bad
>page links and when it was increased to high usage, there were 247.
>
>Let's convert this to a live scenario: a company with a few hundered to
>few thousand users per database loses its transaction logs at the end
>of the day. The only solution is to repair (unless they are happy to
>lose a whole day's email) which can cause an unpredictable amount of
>lost data. IMHO, this is not good for a system that is supposed to be
>good at recovering from failures especially as a restore won't dig you
>out of a hole in this case (though some may argue that I have
>unrealistically high expectations here).
>
>How to mitigate the risk? Well, I'd like to see the dirty pages flushed
>before the stores are suddenly dismounted. There must be a good reason
>why it doesn't but I can't figure out what it is. (Any ideas?)
>Otherwise, back up the logs regularly throughout the day I guess.
>
>Any thoughts?



Exchange commits logs to the store throughout the day as required. You
wouldnt lose all whole days worth of transactions.
The checkpoint file tracks which logs have been committed to the
store.
.

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