On Thu, Aug 4, 2016 at 09:31:18AM -0700, Andres Freund 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?
The index points to the head of the HOT chain, and you just walk the
chain on the page --- on need to look at other chains on the page.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
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