Re: Listen / Notify rewrite

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>> You misunderstand the requirements.  LISTEN notifications are *not*
>> meant to survive a database crash, and never have been.  However,
>> so long as both client and server stay up, they must be reliable.
>> If the client has to poll database state because it might have
>> missed a notification, the feature is just a waste of time.

> Why would it be so important for messages to be reliable if
> the database is up, yet its OK to lose messages if it crashes? The
> application must still allow for the case that messages are lost.

Well, there are many use cases. For example, Bucardo uses notifications
to let it know that a table has changed. If the database crashes,
Bucardo is going to restart - as part of its startup routine, it checks
all tables manually for changes, eliminating the need for the NOTIFYs
to survive the crash.

- --
Greg Sabino Mullane greg@turnstep.com
End Point Corporation
PGP Key: 0x14964AC8 200911160910
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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