--- weigelt@metux.de wrote:
> On Tue, Jun 17, 2003 at 11:49:44AM -0700, Josh Berkus wrote:
>
> <big_snip>
>
> I also need something like that for my replication stuff:
>
> When data from another node comes it, it should be written
> directly to the tables, without any (unwanted) triggers firering.
>
> On the other hand, in "normal" mode, also some missing fields
> should be filled on create or update.
>
I have done this three ways:
1. have all client DML go through views and at the view level do all
checking etc.
+ very robust, very secure
- lots of work
2. have replication updates use the "replicate" user - in triggers, do
nothing if user is replicate, otherwise work as normal
+ very easy to do
- triggers fire always, even when doing nothing
3. have replicate triggers write data file for import directly into the
postgresql engine
+ transactions smaller, less rollback
+ can replicate to different databases, over net, etc
- lots of work (although easy to write trigger generator)
- difficult failure senarios
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