| This chapter provides an overview of the database reorganization tasks that an IMS Database Administrator performs. Specifically, this chapter: Introduces the requirements for and the process of IMS database reorganization. Describes the available IMS utilities for reorganizing HD databases. Describes how to use the utilities for particular situations, including which utility must be run to reorganize an HD database with and without logical relationships or secondary indexes. Includes a short discussion about initially loading databases with logical relationships and secondary indexes, because doing so also requires the reorganization utilities to build the logical relationships and secondary indexes. Discusses reorganizing HALDBs, which have a simpler and shortened reorganization process than do the other full-function databases. As of IMS Version 9, you can reorganize HALDB databases without taking them offline.
Related Reading: For more information about reorganizing HALDBs, see "Reorganizing HALDBs" on page 128. For a complete discussion on the topic of database reorganization, see IMS Version 9: Administration Guide: Database Manager.
In This Chapter: "Purpose of Database Reorganization" "When to Reorganize Databases" "Overview of the Database Reorganization Process" on page 128
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