postgres-xc-general Mailing List for Postgres-XC

To be honest, DML in plpgsql is not fully reviewed and we suspect there
could be something needs improvement/fix.   In the regression test, the
test script issues "update" statements from plpgsql and it works fine.

Regards;
---
Koichi Suzuki


2013/9/22 Lucio Chiessi [VORio] <pos...@vo...>

> My best regards to Postgres-XC developers.
>
> I am writing this e-mail in order to resolve a doubt about the use of
> DML in functions using pl/pgsql.
>
> In section "E.5.7. Restrictions" of the "1.1 Release Notes", I can see
> that DML are not allowed in pl/pgsql.
>
> But looking at the manual Postgres-XC, in the part that deals with the
> use of pl/pgsql, I see instructions that can be used as the EXECUTE and
> PERFORM commands.
>
> My question is: Even with this I will not be able to make DML functions
> using pl/pgsql?
> If not, there is another way to be into de database, or planning to
> include the use of DML in pl/pgsql in future versions?
>
> Thanks!
>
> Lucio Chiessi
> Rio de Janeiro - Brasil
>
>
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GTM-master does not require sync for every command to GTM-standby.   It
requires sync only at the end of grouped commands from GTM-Proxy.   There
should not be significant influence to the performance.

Regards;

---
Koichi Suzuki


2013/9/22 Nikhil Sontakke <ni...@st...>

> Hi Prasad,
>
> 1) I am trying to evaluate the High Availability aspects of PGXC; and
>> notice that GTM, and GTM-standby are configured to be in continuous
>> sync. That means, every status change in GTM is synchronously made at
>> GTM-standby.  In such setup, what is the performance drop becoz of
>> gtm-standby.
>>
>> Are there any benchmark tests run with and without GTM-standby?? what
>> are the numbers??
>>
>>
> We did not see any significant differences in the with and without
> GTM-Standby numbers when we did the runs some while ago. Don't have more
> specifics right now though.
>
>
>
>> 2) How is GTM failure discovered? Vanilla PGXC, doesn't integrate with
>> clusters like Corosync, right??
>>
>>
> You can come up with your resource agents for Corosync/Pacemaker. That's
> what we did at StormDB. We have agents for GTM and datanode failover.
>
>
>> 3) During GTM-failover, I see bunch of manual steps are needed to
>> promote the GTM-standby to master; and make the GTM-proxies reconnect
>> to the new GTM. What happens to the in-flight and new transactions
>> while this GTM-failover happening??
>> I guess all active transaction will have to hang during this period,
>> isn't??
>>
>>
> Again if you integrate properly with Corosync/Pacemaker or have your own
> HA infrastructure in place, then you won't need any manual steps.
>
> Transactions would fail or error out for a brief period when this is
> happening. If the application has logic to retry the transactions then it
> might help.
>
> Regards,
> Nikhils
>
>
>> thanks,
>> -Prasad
>>
>>
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