Re: [Postgres-xc-general] Global transaction ID progress while idle?

On Fri, Jan 25, 2013 at 3:20 AM, Steven Vaughan <
ste...@da...> wrote:

>
>   Howdy, I was watching the GTM's log on a completely idle cluster (in
> fact it's just now being built - there are absolutely zero clients
> performing zero reads or writes) ... and I see a global txn id go by about
> every 30 seconds :
>
> For example :
>
> 1:139937565083392:2013-01-24 18:14:41.802 UTC -LOG:  Assigning new
> transaction ID = 10158
> LOCATION:  GTM_GetGlobalTransactionIdMulti, gtm_txn.c:581
> 1:139937565083392:2013-01-24 18:14:41.802 UTC -LOG:  Sending transaction
> ids from 10158 to 10159
> LOCATION:  ProcessBeginTransactionGetGXIDCommandMulti, gtm_txn.c:1465
> 1:139937483585280:2013-01-24 18:15:10.863 UTC -LOG:  Assigning new
> transaction ID = 10159
> LOCATION:  GTM_GetGlobalTransactionIdMulti, gtm_txn.c:581
> 1:139937483585280:2013-01-24 18:15:10.863 UTC -LOG:  Sending transaction
> ids from 10159 to 10160
> LOCATION:  ProcessBeginTransactionGetGXIDCommandMulti, gtm_txn.c:1465
> 1:139937565083392:2013-01-24 18:15:11.838 UTC -LOG:  Assigning new
> transaction ID = 10160
> LOCATION:  GTM_GetGlobalTransactionIdMulti, gtm_txn.c:581
>
> ...is this a normal heartbeat / synchronization signal or is there
> something unexpected going on?  This cluster consists of precisely one GTM
> (on machine 1) and one GTM_Proxy, Coordinator, and Datanode (all on machine
> 2).
>
You have also automatic transactions in your cluster with autovacuum
workers.
So this is normal.
-- 
Michael Paquier
http://michael.otacoo.com