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Multiple emails get triggered even though only one entry in the table (OD_PENDING_MAIL) from where CT picks up records to be sent as email. In such cases refer these kind of errors found in the SystemOut.log (WebSphere log).

• WTRN0006W: Transaction {0} has timed out after {1} seconds
  
  For example:
  

  Code Block
  language powershell
  WTRN0006W: Transaction 00000188D7CBD648000000455D953708CCA97D4013E3EDB45FD179E3597A7D478393378300000188D7CBD648000000455D953708CCA97D4013E3EDB45FD179E3597A7D478393378300000001 has timed out after 120 seconds

  Solution: Increase the total transaction lifetime timeout and maximum translation timeout in seconds. These settings can be updated through the WebSphere Application Server console, using Servers > Server Types > WebSphere application servers > server_name > [Container Settings] Container Services > Transaction Service
  

  Reference links : https://www.ibm.com/support/pages/troubleshooting-java-transaction-service-jts-problems
  https://www.ibm.com/docs/en/was-nd/8.5.5?topic=server-transaction-service-settings
  
  
• WTRN0037W: The transaction service encountered an error on an xa_recover operation. The resource was com.ibm.ws.rsadapter.spi.WSRdbXaResourceImpl@1f5b7ee3. The error code was XAER_RMERR.
  
  
  Solution:
  Run the following commands as user SYS:
  
  

  Code Block
  language bash
  grant select on pending_trans$ to <user>; grant select on dba_2pc_pending to <user>; grant select on dba_pending_transactions to <user>; grant execute on dbms_system to <user>; //If using Oracle 10.2.0.3 or lower JDBC driver grant execute on dbms_xa to <user>; //If using Oracle 10.2.0.4 or higher JDBC driver

  In the above commands, <user> is the username configured in the Oracle datasource's authentication alias.

  Reference link : https://www.ibm.com/support/pages/exception-occurs-during-recovery-oracle-database-transactions