If an RDAREA is added to accommodate new data for a hash-partitioned table, an imbalance of data occurs between the existing RDAREAs and the added RDAREA. The rebalancing utility (pdrbal) is used to correct such a data imbalance. Correcting an imbalance of data in a hash-partitioned table is called the rebalancing facility for hash row partitioning.
The rebalancing utility rearranges data in units of hash groups. This is called table rebalancing. The table partitioned by a hash function (HASHA to HASHF) is called a rebalancing table.
Figure 10-1 shows an overview of the rebalancing utility and Figure 10-2 shows an overview of rebalancing.
Figure 10-1 Overview of the rebalancing utility
Figure 10-2 Overview of rebalancing