> Here are some disadvantages to using a "trigger based" approach:
>
> 1) Triggers simply transfer individual data items when they
> are modified, they do not keep track of transactions.
I don't know about other *async* replication engines but Rserv
keeps track of transactions (if I understood you corectly).
Rserv transfers not individual modified data items but
*consistent* snapshot of changes to move slave database from
one *consistent* state (when all RI constraints satisfied)
to another *consistent* state.
> 4) The activation of triggers in a database cannot be easily
> rolled back or undone.
What do you mean?
Vadim
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