2010813 - Replication of NOOPs to IQ results in high latency and has a high impact to IQ performance after SRS upgrade to v.15.7.1 | SAP Knowledge Base Article

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2010813 - Replication of NOOPs to IQ results in high latency and has a high impact to IQ performance after SRS upgrade to v.15.7.1

Symptom

  • A lot of single row Updates that change the value in the primary key (PK) column to the exact same value are replicating to the IQ server:

         update dbo.<table_name> set <PK column name> ='value1' where <PK column name> ='value1' and <another column> ='n'
         update dbo.<table_name> set <PK column name> =''value2' where <PK column name> ='value2' and <another column> ='n'
         ...
     
  • The .iqmsg file shows tons of single row Updates on the table, for example:

        Update for 'table_name' completed in 0 seconds. 1 rows updated.
       
  • Replication to the IQ server is significantly slower.
  • The IQ server performance is severely impacted to a point that it becomes unresponsive and no new connections can be established.
  • Replication Server upgrade to version 15.7.1 SP102 from version 15.6 ESD #3 triggered this issue.

Read more...

Environment

  • SAP Replication Server (SRS) 15.7.1
  • SAP IQ 15.4

Product

SAP Replication Server 15.7 ; SAP Sybase IQ 15.4

Keywords

no-op, RepServer, CR762866, 762866, CR756044, 756044, dsi_bulk_threshold , KBA , BC-SYB-REP , Sybase Replication Server (standalone) , Bug Filed

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