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Status Not under consideration
Workspace Data Replication: Change Data Capture
Created by Guest
Created on Aug 24, 2017

RELATED IDEAS

IIDR version 11.4 should to support Oracle RAC flexibility allowing database instances up/down on any nodes for undefined lon

IIDR version 11.4 should to support Oracle RAC flexibility allowing database instances up/down on any nodes for undefined long period time within the cluster. For Oracle RAC databases, as long as one instance is up and running, the
database is available.
In our environment, not all Oracle RAC instances for a given database are up and running on all Oracle RAC nodes.
we have defined cluster service that has the AVAILABLE and PREFERED nodes defined,
the web/app server connects to a database instance using the cluster service
for example, in a 4 node RAC, database A will be created with 4 instances(4 redo threads) but only 2 database instance of A will be up and functional. rest of the two database instances will be shut down and will only be started and used in the event of any of the failure of the 2 nodes where the database was up.

we also use Oracle RAC to protect IBM CDC as cluster resource, so it can fail over with Application- VIP (CDC-VIP) to an available Cluster nodes.

we expected CDC agent can come up clean and able to restart replication without any human intervention like reset bookmark or change datastore parameters.

The problem we had experienced was on a two node RAC.
Instance one was down on node1, CDC on node2 can read instance 1 archive logs from the shared archive logs directory
and subscription can restart replication from the fail point.

Few days later, some event caused the subscription to go down again.
This time subscription cannot be restarted because it was looking for the long gone archive logs for instance 1.
but if we restart instance 1 on node1, the problem went away.

we request that without having to restart the database instance on the node that was down, we should be able to re-start the subscription
and continue mirroring/replication.

  • Admin
    KATIE LE
    May 28, 2026

    .

    1 reply
  • Guest
    Apr 16, 2026

    Actually this is a big design flaw in the CDC implementation.


    Most use RAC for High Availability reasons and CDC won't work if only one of the RAC nodes is down.


    There is actually a documented workaround how to get it running if one node is missing:
    https://www.ibm.com/support/pages/iidr-oracle-steps-continue-mirroring-setting-system-parameter-racclusternodelist-when-rac-node-down-long-period?view=full

    But this is unbelievably dangerous.

    Imagine this straight forward example:


    • RAC Node 1

      • CDC Engine Runs on RAC Node 1 (but can be taken over to RAC Node 2 -> CRS service)

    • RAC Node 2


    RAC Node 2 goes down.

    I have to set rac_cluster_node_list=1

    The DBA starts node 2 and transaction start running.


    I then update the rac_cluster_node_list=1,2 but all transactions on node 2 in the meantime are lost for replication.


    This can not be a valid procedure for this to work.


    This can also be very hard to automate and integrate into operations.

    Reply
  • Guest
    May 17, 2021

    [IBM Update]

    Hi,

    Thank you for filing this requirement and for your interest in keeping CDC a vital and successful technology. We depend on your continued interest and ideas to help ensure our products keep pace with market needs and industry standards.

    Although we do agree that your request is valid, after monitoring your request for more customer demand over the last few years and applying other relevant evaluation criteria, unfortunately we won't be able to accept your request at this time. However, if there is still an important business need, we encourage you to file a new idea accompanied with any additional information that could help us prioritize the requirement in the future.

    Reply
  • Guest
    Dec 25, 2019

    I think that the same is true of the RAC one node.

    Reply

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