content_image/1010882.jpg content_image/1010880.jpg
4. Enter 6  and press Enter. A window similar to the window that is shown in Figure 10-6 opens. Db2 subsystems that cannot be selected because they are not enabled for incremental updates are listed. Under “Select a database system”, you see the Db2 subsystems that you can select. 

<img src='content_image/1010882.jpg'>

5. Enter the number of the Db2 subsystem that you want to enable and press Enter. The message that is shown in Figure 10-7 is displayed. 

<img src='content_image/1010880.jpg'>

## Performance measurement 

The performance measurement used as many as 500 IBM Retail Data Warehouse LINEITEM-like tables to simulate the customer’s use case. Each table includes approximately 24 million rows and is in a partition by range table space. Concurrent insert and update transactions were run against these 500 tables. The measurement is to compare the replication throughput of a single apply to multiple apply with a default of four parallel apply threads. 

## Performance results 

The measurements showed up to 98% replication throughput improvement comparing parallel apply by using four threads to apply by using a single thread. 

