Re: Patch: add timing of buffer I/O requests

Peter Geoghegan <peter@2ndquadrant.com> writes:
> On 10 April 2012 23:07, Greg Smith <greg@2ndquadrant.com> wrote:
>> On 04/10/2012 12:27 PM, Tom Lane wrote:
>> I am doing more sophisticated things with it, so I'll celebrate this as my
>> opportunity to say I did something you didn't see coming for 2012.

> This is why I requested that we expose the query_id hash value - I
> believe that it will be generally useful in clustering situations. It
> would be nice to have a persistent identifier. While we're discussing
> revising pg_stat_statement's interface, are you still opposed to
> exposing that value, Tom?

I still am.  I'm unconvinced by references to "clustering situations",
because as constructed the hash is extremely database-specific.
It will vary depending on OID assignments, not to mention platform
characteristics such as word width and endianness.
        regards, tom lane