On 25 March 2015 at 20:14, Peter Mogensen <apm@one.com> wrote:
On 2015-03-25 12:32, Craig Ringer wrote:
On 25 March 2015 at 19:15, Peter Mogensen <apm@one.com> wrote:
Say ... I have a table in a BDR replicated database with an "ON UPDATE" trigger. - and that trigger wants to locally find out the local txid_snapshot_xmin() when a change was applied to the local node.
Why would you want to do that? Just out of interest?
Because I have a bunch of SELECT queries to the local node, which includes the txid_current() in their result, and I want to be able to recognize a result which was obtained prior to a change reaching the local node.
So you're trying to do cache invalidation / cache verification of some form?
I'm interested in what you're looking at doing, but would probably need a more complete description to offer much input.