Re: intercepting WAL writes

On Wed, May 28, 2008 at 7:11 PM, Mike <mike@fonolo.com> wrote:
>> Can somebody point to the most logical place in the code to intercept the
>> WAL writes? (just a rough direction would be enough)
>
>XLogInsert
>

Great- I'll take a look at that code.

>> 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).
>
>Without triggers, you don't have many options.  With triggers, you
>could use pg_memcache.  If you take it from the WAL, you'll have to do
>a bit of decoding to make it usable in the context you're looking for,
>which is quite a bit of work.
>

When you say a bit of decoding, is that because the data written to the logs
is after the query parser/planner? Or because it's written in several
chunks? Or?

I turned on WAL_DEBUG; it wasn't immediately helpful, tho I don't know what
it means quite yet. I guess perfectly formatted SQL statements would be too
easy ;)

Mike