On 28/07/16 17:52, Jason Dusek wrote:
With regards to write amplification, it makes me think about about
OIDs. Used to be, every row had an OID and that OID persisted across
row versions.
https://www.postgresql.org/docs/9.5/static/runtime-config-compatible.html#GUC-DEFAULT-WITH-OIDS
Would reintroducing such a feature address some of Uber's concerns
about multiple indexes? It could, and would do so without the implicit
requirement of a foreign key; but it would also require a fast OID to
CTID mapping.
On Tue, 26 Jul 2016 at 10:40 Guyren Howe <guyren@xxxxxxxxx
<mailto:guyren@xxxxxxxxx>> wrote:
Honestly, I've never heard of anyone doing that. But it sounds
like they had good reasons.
https://eng.uber.com/mysql-migration/
Thoughts?
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Would it be best to increase OIDs to 64 bits?
Possibly a choice of 32/64 to be decided when the DB is created???
Cheers,
Gavin
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