Re: [HACKERS] Patch: Write Amplification Reduction Method (WARM)

On Tue, Mar 21, 2017 at 11:54:25PM +0530, Pavan Deolasee wrote:
> We can also save HEAP_WARM_UPDATED flag since this is required only for
> abort-handling case. We can find a way to push that information down to the old
> tuple if UPDATE aborts and we detect the broken chain. Again, not fully thought
> through, but doable. Of course, we will have to carefully evaluate all code
> paths and make sure that we don't lose that information ever.
> 
> If the consumption of bits become a deal breaker then I would first trade the
> HEAP_LATEST_TUPLE bit and then HEAP_WARM_UPDATED just from correctness
> perspective.

I don't think it makes sense to try and save bits and add complexity
when we have no idea if we will ever use them, but again, I am back to
my original question of whether we have done sufficient research, and if
everyone says "yes", I am find with that.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
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