Re: Re: [COMMITTERS] pgsql: Efficient transaction-controlled synchronous replication. - Mailing list pgsql-hackers

On 18.03.2011 16:52, Kevin Grittner wrote:
> Simon Riggs<simon@2ndQuadrant.com>  wrote:
>
>> In PostgreSQL other users cannot observe the commit until an
>> acknowledgement has been received.
>
> Really?  I hadn't picked up on that.  That makes for a lot of
> complication on crash-and-recovery of a master, but if we can pull
> it off, that's really cool.  If we do that and MySQL doesn't, we
> definitely don't want to use the same terminology they do, which
> would imply the same behavior.

To be clear: other users cannot observe the commit until standby 
acknowledges it - unless the master crashes while waiting for the 
acknowledgment. If that happens, the commit will be visible to everyone 
after recovery.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com