On 5/23/2010 4:48 PM, Greg Sabino Mullane wrote:
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Exposing the data will be done via a set returning function. The SRF
takes two arguments. The maximum number of rows to return and the last
serial number processed by the reader. The advantage of such SRF is that
the result can be used in a query that right away delivers audit or
replication log information in transaction commit order. The SRF can
return an empty set if no further transactions have committed since, or
an error if data segments needed to answer the request have already been
purged.
In light of the proposed purging scheme, how would it be able to distinguish
between those two cases (nothing there yet vs. was there but purged)?
There is a difference between an empty result set and an exception.
Jan
--
Anyone who trades liberty for security deserves neither
liberty nor security. -- Benjamin Franklin
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