Hi,
>> Where is the OID of tuple stored in a WAL record of a
>> tuple? If not with xl_heap_header, where is it stored? Is it
>> stored at all?
> It's stored in the "tuple data" portion.
Is the OID also recorded with xl_heap_delete record as well or just the
xl_heaptid? From my reading of the code it is not recorded.
In general, why is OID of a tuple relegated as just another tuple data, when it
can replace xl_heaptid as a much more stable tuple identifier. I understand
that by recording tuples in terms of xl_heaptid (i.e., page/offset) means that
the db can recover quickly but isn't there some value to storing a much "higher
level" information in the WAL logs? For example, tuple manipulations, if
recorded in terms of manipulation on tuple oids, can support applications such
as these:
http://blogs.enterprisedb.com/2011/03/03/more-musings-on-logical-replication/
Just a thought.
Thanks,
Jagan
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