Mike schrieb:
>
> Hello,
>
> I’m new to the core PostgreSQL code, so pardon the question if the
> answer is really obvious, and I’m just missing it, but I’ve got a
> relatively large web application that uses PostgreSQL as a back-end
> database, and we’re heavily using memcached to cache frequently
> accessed data.
>
> I’m looking at modifying PostgreSQL (in some way) to push changes
> directly to our memcache servers, in hopes of moving towards a system
> where only writes are actually sent to the databases, and reads are
> exclusively sent to the memcache servers.
>
> I’m guessing that I could intercept the WAL writes, and use this
> information to push out to my memcache servers, similar to a
> replication model.
>
> Can somebody point to the most logical place in the code to intercept
> the WAL writes? (just a rough direction would be enough)- or if this
> doesn’t make sense at all, another suggestion on where to get the
> data? (I’m trying to avoid doing it using triggers).
>
> Thanks,
>
> Mike
>
Why not use rules? They are far more easy to use than patching at C
Level, and you can simply write some functions at C level and load those
as a postgres extension, and interact with MemCache at this level.