Managing unusable space with IMS tools

Space in a DEDB should be closely monitored to avoid out-of-space conditions for an area.

Products such as the IMS High Performance (HP) Pointer Checker, which includes the Hierarchical Database (HD) Tuning Aid and Space Monitor tools, can identify the different percentages of free space in the RAP, dependent overflow, and independent overflow CIs. If a large amount of space exists in the RAP CIs or dependent overflow CIs, and independent overflow has a high use percentage, a reorganization can allow the data to be stored in the root addressable part, freeing up independent overflow CIs for use by other UOWs. The IMS HP Pointer Checker and the tools it includes can help you determine if the data distribution is reasonable.