I'd like to see still more evidence that it's a problem before we start changing that piece of code. It has served us well for years.

Bruce Momjian wrote:
Is there a TODO here?


Heikki Linnakangas wrote:
Pavan Deolasee wrote:
Another simpler solution for VACUUM would be to read the entire CLOG file
in local memory. Most of the transaction status queries can be satisfied
this local copy and the normal CLOG is consulted only when the status is
The clog is only for finished (committed/aborted/crashed) transactions.
If a transaction is in progress, the clog is never consulted. Anyway,
that'd only be reasonable for vacuums, and I'm actually more worried if
we had normal backends thrashing the clog buffers.

  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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