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Status Delivered
Workspace Db2
Created by Guest
Created on Oct 6, 2017

Allow Read Only Sharing on HADR while Catalog updates

We are trying to use HADR Read only Sharing to allow ad-hoc query against a 4Tb transactional database.

The standby should allow us to reduce the impact of ah-hoc business queries.

The application is a vendor supplied document storage and retrieval application.

For every new case the application creates a db2 sequence object and consequently we have several million sequence objects in the database.

The application creates a new sequence object every few seconds.
  • Guest
    Aug 3, 2019

    Enhancement to HADR Reads On Standby feature delivered in v11.1.4.4 and v11.5.0.0 significantly reduces the impact of ROS queries due to catalog changes on the primary database. In v11.1.4.4 the new feature needs to be explicitly enabled via "db2set DB2_HADR_ROS_AVOID_REPLAY_ONLY_WINDOW=ON". In v11.5.0.0 the new feature is enabled by default.

    Will mark this RFE as shipped. If anyone still experience difficulties after the above enhancement, please open new RFE.