Re: WAL, xl_heap_insert and tuple oid mystry

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