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Designing databasesThe first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
Designing and Implementing a DatabaseThe HCL OneDB™ Database Design and Implementation Guide provides information to help you design, implement, and manage your HCL® OneDB® databases. It includes data models that illustrate different approaches to database design and shows you how to use structured query language (SQL) to implement and manage your databases.
Managing databases
Distributed queries
Server environment and distributed queriesSet the DEADLOCK_TIMEOUT configuration parameter and the PDQPRIORITY environment variable to specify information for distributed queries.

Server environment and distributed queries

Set the DEADLOCK_TIMEOUT configuration parameter and the PDQPRIORITY environment variable to specify information for distributed queries.

The DEADLOCK_TIMEOUT configuration parameter specifies the maximum number of seconds that a database server thread can wait to acquire a lock. If a distributed transaction is forced to wait longer than the number of seconds specified, the thread that owns the transaction assumes that a multi-server deadlock exists. The following error message is returned:

-143 ISAM error: deadlock detected.

The effective value of PDQPRIORITY for a session is sent to the remote site when a connection is established. Subsequent changes to this parameter in the coordinator are not reflected on the remote site. However, the exact behavior of this environment variable depends on the role of the database server in the distributed query (coordinator or participant).

PDQPRIORITY has different syntax and semantics for different server versions. For information about setting PDQPRIORITY, see the HCL OneDB™ Performance Guide for your server.

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