Re: Service de-registration after switchover question

  • From: Oleksandr Denysenko <odenysenko@xxxxxxxxx>
  • To: dougk5@xxxxxxx, oracle-l <oracle-l@xxxxxxxxxxxxx>
  • Date: Wed, 16 May 2018 19:41:38 +0300

DOUG,

they are not needed until you are using GI, without it you have to use them for 
automation.

it any case, now we have situation when broker has stopped services at GI level, but they are up at instance level and registered with listener

so, it may be:

 * manual service startup
 * trigger
 * some king of magic
     o like oracle BUG ... ;)

what to do next:

 * check instance alert.log at the time of switchover. you have to see services 
reset and after set
   again - that have to be interesting
 * check listener.log at the time of switchover for services deregistration and 
registration again
   or no such operations
 * check for GI Agent log for services related activities

Best Regards,

    Oleksandr Denysenko

16.05.2018 19:31, DOUG KUSHNER пишет:


We have not implemented any fail-over triggers.  It was my understanding that they were required pre-11.2, before the role attribute had been added to service config, but in 11.2.0.4 and later are not needed.


On May 16, 2018 at 12:15 PM Oleksandr Denysenko <odenysenko@xxxxxxxxx> wrote:

Niall,

documentation says <https://docs.oracle.com/database/121/NETAG/advcfg.htm#sthref817> that it's *ON *by default

    /Connect-time failover is turned //|on|//by default for multiple address 
lists
    (ADDRESS_LIST), connect descriptors (DESCRIPTION), and multiple connect 
descriptors
    (DESCRIPTION_LIST)./

Best Regards,

     Oleksandr Denysenko
16.05.2018 18:57, Niall Litchfield пишет:
If you are doing client-side failover your TNS entry would need to be (I think)

ABCR_USR =
  (DESCRIPTION =
*(FAILOVER=ON)*
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = abcr-prim-scan)(PORT = 1521))  <<< 
This is new standby
      (ADDRESS = (PROTOCOL = TCP)(HOST = abcr-stby-scan)(PORT = 1521))  <<< 
This is new primary
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = ABCR_USR)
    )
  )

You should check the Net Services Administration Guide to make sure I've got that in the right place (I likely haven't). The principle being though that if you aren't using TAF/FAN then its up to the client to retry addresses until one succeeds.

On Wed, May 16, 2018 at 9:55 AM, Doug Kushner <dougk5@xxxxxxx 
<mailto:dougk5@xxxxxxx>> wrote:

    Additional info as requested, all from the first node of the new standby 
RAC server.

    NAME TYPE        VALUE
    ------------------------------------ ----------- 
-------------------------------------------
    db_unique_name string      ABCR1
    service_names string      ABCR_PERL,ABCR_TSAM,ABCR_USR,ABCR_WEB,ABCR1

    The HOST names in the following ADDRESS_LIST are DNS cnames that alias the 
scan names on
    each of the platforms.

    ABCR_USR =
      (DESCRIPTION =
        (ADDRESS_LIST =
          (ADDRESS = (PROTOCOL = TCP)(HOST = abcr-prim-scan)(PORT = 1521))  <<< 
This is new standby
          (ADDRESS = (PROTOCOL = TCP)(HOST = abcr-stby-scan)(PORT = 1521))  <<< 
This is new primary
        )
        (CONNECT_DATA =
          (SERVER = DEDICATED)
          (SERVICE_NAME = ABCR_USR)
        )
      )

    Listener entries for the other ABCR_* services are identical to the 
ABCR_USR entry and have
    been omitted.

    LSNRCTL> services
    Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
    Services Summary...
    Service "ABCR1" has 1 instance(s).
      Instance "ABCR11", status READY, has 1 handler(s) for this service...
        Handler(s):
          "DEDICATED" established:1504 refused:0 state:ready
             LOCAL SERVER
    Service "ABCR1_DGB" has 1 instance(s).
      Instance "ABCR11", status READY, has 1 handler(s) for this service...
        Handler(s):
          "DEDICATED" established:1504 refused:0 state:ready
             LOCAL SERVER
    Service "ABCR1_DGMGRL" has 1 instance(s).
      Instance "ABCR11", status UNKNOWN, has 1 handler(s) for this service...
        Handler(s):
          "DEDICATED" established:32 refused:1
             LOCAL SERVER
    Service "ABCR_USR" has 1 instance(s).
      Instance "ABCR11", status READY, has 1 handler(s) for this service...
        Handler(s):
          "DEDICATED" established:1504 refused:0 state:ready
             LOCAL SERVER
    The command completed successfully

    On 5/16/2018 12:19 AM, Oleksandr Denysenko wrote:

    Hello.

    please, show from new standby:

      * show parameter db_unique_name
      * show parameter service_name
      * lsnrctl services
      * full desctiption of used TNS connection string

    Best Regards,

         Oleksandr Denysenko
    16.05.2018 8:19, Doug Kushner пишет:
    Hi all,

    Please be kind as this is my first posting to this list.

    We have two RAC platforms with 12.2.0.1 GI and 11.2.0.4 RDBMS replicating 
with Data
    Guard.  Switchover testing was successful using the broker with the roles 
switching
    successfully.  Services have been configured with the primary role on both 
platforms and
    as expected, after switchover the services are stopped on the new standby 
and started on
    the new primary.  The applications are not TAF/FAN aware, so these tests 
assume for the
    time being that we are shutting down the apps (external connections) and 
restarting them
    after the switchover.

    Now for the question...  We expected as part of this switchover, that the 
services which
    were stopped would automatically be de-registered from the listener on the 
new standby
    side.  However, they are still registered, and we are wondering if it is 
our expectations
    or our configuration that is at fault.

    With the services still registered on the standby side, sqlplus connection 
attempts to the
    service result in an ORA-01033 error, since the standby address is the 
first of the two
    addresses in the TNS alias.

    Have not been able to find any info regarding deregistration of services in 
the listener
    after a switchover, so thought I would ask the experts.

    Thanks,
    Doug



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--
Niall Litchfield
Oracle DBA
http://www.orawin.info



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