Re: Proposal: Generic WAL logical messages

On 2016-04-06 10:15:59 -0400, Tom Lane wrote:
> > In some ways it seems like the argument to pg_logical_emit_message(...) should
> > be 'bytea'. That'd be much more convenient for application use. But then
> > it's a pain when using it via the text-format SQL interface calls, where
> > we've got no sensible way to output it.

There's a bytea version.

> Well, that's something worth thinking about.  I assume that
> pg_logical_slot_get_changes could be executed in a database different from
> the one where a change was originated?

You can execute it, but you'll get an error:if (slot->data.database != MyDatabaseId)    ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),     (errmsg("replication slot \"%s\" was not created in this
database",             NameStr(slot->data.name)))));
 


Greetings,

Andres Freund