On 11/12/2014 06:57 PM, Alvaro Herrera wrote:
>> How did template0 even get a MultiXact? That sounds like they're really 
>> abusing the template databases. :( (Do keep in mind that MXID 1 is a special 
>> value.)
> No, it's normal -- template0 does not have a multixact in any tuple's
> xmax, but datminxid is set to the value that is current when it is
> frozen.
> 

So, to follow up on this: it seems to me that we shouldn't be requiring
freezing for databases where allowconn=false.  This seems like a TODO to
me, even possibly a backpatchable bug fix.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com


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