Concepts and Facilities

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# Concepts and Facilities

Adabas Parallel Services is a selectable unit of Adabas that helps you make full use of multiple-engine processors by allowing a single physical database to be accessed simultaneously by up to 31 nuclei.

This document is organized as follows:

What is Adabas Parallel Services? | Provides a high-level description of the product.
Adabas Parallel Services and Adabas Cluster Services | Describes the differences between Adabas Parallel Services and Adabas Cluster Services.
Assigning Users | Describes how Adabas Parallel Services assigns users to nuclei in a cluster.
Cluster Tasks | Describes the types of tasks that comprise an Adabas Parallel Services cluster.
Global Areas | Describes global area usage in Adabas Parallel Services.
Global Messaging Services | Describes the messaging services that are essential to communication among the active nuclei of an Adabas Parallel Services cluster.
Global Commands | Describes the global operator commands available with Adabas Parallel Services.
Logs and Log Merges | Describes the protection log (PLOG) and command log (CLOG) usage in Adabas Parallel Services.
Parallel Participant Table (PPT) | Discusses the use of the Parallel Participant Table (PPT) in Adabas Parallel Services.
Dynamic Allocation | Describes the use of dynamic allocation by ADARES for Adabas Parallel Services data sets and files.
Components Summary | Provides a component summary for Adabas Parallel Services.
Switching Between Cluster and Noncluster Modes / PLOG Handling | Describes switching between cluster and non-cluster modes in Adabas Parallel Services.
Adabas Parallel Services and Other Software AG Products | Describes the support for Adabas Parallel Services provided by other Software AG products.
Restricted Support for Adabas Features | Describes facilities that are not supported for cluster nuclei running under Adabas Parallel Services or for which restricted support is provided.
Getting Started | Describes how to get started using Adabas Parallel Services and where to go for more information.

- Conventions