Treehouse Software TREETIP: Data Replication for a Mainframe Database that has no Primary Key, using tcVISION

by Joseph Brady, Director of Business Development / AWS and Cloud Alliance Lead at Treehouse Software, Inc. and Chris Rudolph, Senior Technical Representative at Treehouse Software, Inc.

This blog takes a look at tcVISION’s support for a mainframe database that has no primary key at the source (a mainframe primary key is a column, or set of columns that uniquely identifies one row of a table). 

In situations where the source database does not contain any unique values, Treehouse technicians discuss with the customer how the application currently works and their expectations for how the data should be treated when planning replication/migration to a new target environment. Depending on the application, Journal Replication or Data Warehouse Replication may be a better fit than a “normal” RDBMS table definition.

tcVISION‘s Key ID management can be used to create a column to use as the key on the target table. Another option would be to use a SQL Lookup to query another table. Either way, target column(s) that contain unique values will need to be identified. Once these columns are identified, they can be marked with the key identifier, using the tcVISION repository editor, or Key ID Management can be used to create a new unique column, then those columns are used within the wizard.

For example, this source table does not contain a primary key:


Analysis of the target data shows the columns FIRST_NAME, LAST_NAME and MIDDLE_NAME together will provide a unique value. These fields can be marked in the tcVISION repository as being members of a key:


As mentioned earlier, the tcVISION Key ID Management wizard can also be used to create a new unique target column:


Specify the key name:


Specify the key value creation:


Various options are available: 



Contact Treehouse Software for a Demo Today…


No matter where you want your mainframe data to go – the cloud, open systems, or any LUW target – tcVISION from Treehouse Software is your answer.

Just fill out the Treehouse Software Product Demonstration Request Form and a Treehouse representative will contact you to set up a time for your online tcVISION demonstration.

Further reading: tcVISION Mainframe data replication is featured on the AWS Partner Network Blog…


AWS recently published a blog about tcVISION’s Mainframe data replication capabilities, including a technical overview, security, high availability, scalability, and a step-by-step example of the creation of tcVISION metadata and scripts for replicating mainframe Db2 z/OS data to Amazon Aurora. Read the blog here: AWS Partner Network (APN) Blog: Real-Time Mainframe Data Replication to AWS with tcVISION from Treehouse Software.

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