Terminology
The IMS Database Space Tuning Guide topics use several unique terms that you should understand before you begin policy-based database tuning.
Unique terms used in this information
The following unique terms are used in this information:
- Data element
- A data element consists of a data element tag and a data element value pair based on the collected sensor data.
- Exception or database exception
- Refers to a database exception that is detected while a database is being evaluated. Exception conditions are based on threshold values that are defined in a policy in the REORG domain of Policy Services. This type of policy is called a reorganization policy.
- Policy or reorganization policy
- Refers to a set of criteria that is used in the policy evaluation process for evaluating database status. Reorganization policies belong to the REORG domain of Policy Services.
- Rule
- Refers to a criteria for evaluating the status of a database. Rules are contained in one or more reorganization policies.
- Sensor data
- Sensor data is the information collected from the databases for the purpose of measuring the state of a specific database condition.
These topics use the following IMS unique terms.
| Abbreviation | IMS system resource |
|---|---|
| ACB | IMS application control block |
| CI | Control interval of a VSAM data set |
| DBD | IMS database description |
| DBRC | IMS Database Recovery Control facility |
| DEDB | IMS data entry database |
| DOVF | Dependent overflow section of a DEDB area or a UOW |
| DMAC | DEDB area control list |
| DMB | IMS data management block |
| DMCB | DEDB master control block |
| FFDB | Generic name for all IMS full-function database types. The following database types are included: HDAM, HIDAM, HISAM, SHISAM, INDEX, PHDAM, PHIDAM, and PSINDEX. |
| HALDB | IMS High Availability Large Database type. The following database types are included: PHDAM, PHIDAM, and PSINDEX. |
| IOVF | Independent overflow section of a DEDB area |
| MADS | DEDB multiple area data sets |
| RAA BASE or RAA | Root addressable part of a DEDB area or of a UOW |
| RAP | Root anchor point in the RAA BASE CI of a UOW |
| RECON | IMS Recovery Control |
| SDEP | Sequential dependent part of a DEDB area |
| UOW | Unit of work of a DEDB area |
Product short names
Except where noted, the various versions of IMS are referred to simply as IMS.
These topics use the following abbreviations for product and component short names.
| Short name | Product name |
|---|---|
| Autonomics Director | IBM® IMS Tools Base for z/OS® Autonomics Director |
| FF Stand-alone DB Sensor | Full-function Stand-alone Database Sensor component of IMS Database Solution Pack or IMS Database Utility Solution |
| FP Stand-alone DB Sensor | Fast Path Stand-alone Database Sensor component of IMS Fast Path Solution Pack |
| IMS Administration Foundation | IMS Administration Foundation features of IBM Unified Management Server for z/OS |
| IMS Database Reorganization Expert | IBM IMS Database Reorganization Expert for z/OS |
| IMS Database Solution Pack | IBM IMS Database Solution Pack for z/OS |
| IMS Database Utility Solution | IBM IMS Database Utility Solution for z/OS |
| IMS Fast Path Solution Pack | IBM IMS Fast Path Solution Pack for z/OS |
| IMS HP Fast Path Utilities or IMS HPFPU | IBM IMS Fast Path Solution Pack for z/OS: IMS High Performance Fast Path Utilities |
| IMS HP Image Copy | IBM IMS High Performance Image Copy for z/OS |
| IMS HP Load | IBM IMS High Performance Load for z/OS |
| IMS HP Pointer Checker | IBM IMS High Performance Pointer Checker for z/OS |
| IMS Tools Base | IBM IMS Tools Base for z/OS |
| IMS HP Unload | IBM IMS High Performance Unload for z/OS |
| IMS Tools Knowledge Base, IMS Tools KB, or ITKB | IBM IMS Tools Base for z/OS IMS Tools Knowledge Base |
| Management Console | IBM Management Console for IMS and Db2® for z/OS |
| Policy Services | IBM IMS Tools Base for z/OS Policy Services |