Implementing Siebel Business Applications on DB2 for z/OS > Migrating Data Using Siebel Enterprise Integration Manager > About Setting Up EIM for DB2 >

Optimal Number of Parallel Streams

A rule to determine how many batches can run simultaneously is that the combined number of parallel streams should keep the CPU 100 percent busy. These can either be multiple EIM processes running simultaneously, or the same EIM process repeated against multiple partitions of the same table.

If you run EIM processes in parallel on a DB2 database with the default setting of UPDATE STATISTICS set to TRUE in the EIM configuration file (.ifb), deadlocks can occur when multiple EIM processes access the same interface table simultaneously. To avoid a deadlock, set UPDATE STATISTICS to FALSE in the EIM configuration file.

A similar problem might occur if parallel processes access the same child tables while updating foreign keys. Therefore, analyze your EIM mappings and processes, and do not run these processes in parallel. Alternatively, you can try altering the locking level from Page to Row.