Hi,

> Let's say I am ok with losing some transactions in the rare case of
> server crash. But this issue raises some consistency concerns.
> Is it quaranteed somehow, that if the delete of OT is lost also the
> insert of NT is lost.

Yes, if you do both within the same transaction. See
http://en.wikipedia.org/wiki/Database_transaction

> In other words do the writes to disk get serialized?

I'm not sure if I understand this question, but yes, they are serialized.

> And does transaction concurrency mode have an effect on this?

Usually not, except if you disable locking.

Regards,
Thomas

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