On 4 August 2016 at 17:31, Andres Freund <and...@anarazel.de> wrote: > Hi, > > On 2016-08-04 16:29:09 +0530, Pavan Deolasee wrote: >> Indexes whose values do not change do not require new index pointers. Only >> the index whose key is being changed will need a new index entry. The new >> index entry will be set to the CTID of the root line pointer. > > That seems to require tracing all hot-chains in a page, to actually > figure out what the root line pointer of a warm-updated HOT tuple is, > provided it's HOT_UPDATED itself. Or have you found a smart way to > figure that out?
Hmm, sorry, I did think of that point and I thought I had added it to the doc. So, yes, I agree - re-locating the root is the biggest downside to this idea. Perhaps Pavan has other thoughts? I think its doable, but it will be fiddly. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers