Em 10/04/2018 12:28, Melvin Davidson escreveu:

On Tue, Apr 10, 2018 at 11:04 AM, Vikas Sharma <shavi...@gmail.com <mailto:shavi...@gmail.com>> wrote:

    Hi Adrian,

    This can be a good example: Application server e.g. tomcat having
    two entries to connect to databases, one for master and 2nd for
    Slave (ideally used when slave becomes master). If application is
    not able to connect to first, it will try to connect to 2nd.


    On 10 April 2018 at 15:26, Adrian Klaver
    <adrian.kla...@aklaver.com <mailto:adrian.kla...@aklaver.com>> wrote:

        On 04/10/2018 06:50 AM, Vikas Sharma wrote:


            We have postgresql 9.5 with streaming
            replication(Master-slave) and automatic failover. Due to
            network glitch we are in master-master situation for quite
            some time. Please, could you advise best way to confirm
            which node is latest in terms of updates to the postgres

        It might help to know how the two masters received data when
        they where operating independently.

            Vikas Sharma

-- Adrian Klaver
        adrian.kla...@aklaver.com <mailto:adrian.kla...@aklaver.com>


*Presuming the the real "master" will have additional records/rows inserted in the tables,
*if you run ANALYZE on the database(s) in both "masters", then execute the following query
*on both, whichever returns the highest count would be the real "master".

 SELECT sum(c.reltuples::bigint)
    FROM pg_stat_all_tables s
      JOIN pg_class c ON c.oid = s.relid
 WHERE s.relname NOT LIKE 'pg_%'
   AND s.relname NOT LIKE 'sql_%';*

*Melvin Davidson**
Maj. Database & Exploration Specialist**
Universe Exploration Command – UXC*
Employment by invitation only!

I'm just trying to understand the scenario...

Correct me if I'm wrong, if you had two servers acting as master for a while, then you have inserted/updated records on both servers, and you will need some kind of "merge" of records into one of the databases, that will become the new updated master...

If you have "sequences" (or "serial" fields), then you will get a bit trouble in your hands.



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