[ZODB-Dev] ZEO Client cache invalidation?

[Jeremy Hylton]

[I wrote:]
> As I understand sync() -- and I may be wrong -- it's necessary when you
> start a transaction after an idle period.  If you finish one transaction
and
> immediately start another, there should be no pending invalidations.  If
> there's a long delay between the end of one transaction and the start of
the
> next, the invalidation messages will get queued up waiting for the next
> commit/abort.

[Christian wrote:]
Or if you don't have a transaction currently open, which is my case - my
client does read-only queries, and it wasn't picking up the change. Is
calling begin() really necessary, or do we auto-begin() one on any
persisted object modification?

[I reply:]
You've got it.  If you haven't modified any objects, I don't think the
machinery realizes that a transaction has started.  As soon as you modify an
object, the current transaction starts getting tracked.  If you're doing a
read-only transaction, you need a sync().

Jeremy