Copyright © TIBCO Software Inc. All Rights Reserved
Copyright © TIBCO Software Inc. All Rights Reserved


Chapter 1 Introduction : Functional Overview of Data Access

Functional Overview of Data Access
How the Gateway Transactions Process External DBMS Data
The process used by TIBCO Object Service Broker to access data via its external Gateways, consists of the following basic steps:
1.
2.
The Data Object Broker selects a Gateway (considered to be a shared resource) by matching the SERVERTYPE and SERVERID values in the request to a corresponding Gateway.
3.
The Data Object Broker sends the request to the Gateway, which converts the request into the form expected by the external DBMS and then submits the transformed request.
4.
Data returned by the external DBMS is converted into TIBCO Object Service Broker format, sent to the Data Object Broker, and then to the client session.
Configuring Execution Environments
Before you start the Gateway, you must configure the Execution Environment where the Gateway is to run.
For more information about configuration, refer to Chapter 3, Configuring and Operating.
Security Settings for Data Access
The setting of the SECLEVEL gateway parameter dictates what security information the Gateway uses to connect to an external DBMS when access to external data is requested. For example, if SECLEVEL=0, the Gateway uses the TIBCO Object Service Broker user ID and password to connect to an external DBMS. If SECLEVEL=1, the Gateway uses the TIBCO Object Service Broker client session ID, current group name, or an externally defined ID to connect to an external DBMS.
Sending Data to the Data Object Broker
Starting the Gateway creates a connection to the Data Object Broker. The Gateway maintains a connection with the Data Object Broker for the life of the entire Gateway session. Data is sent to the Data Object Broker in variable length buffers up to a maximum of 31 KB. If a single request requires more than 31 KB of data, multiple 31 KB buffers are sent until the request is complete.
Data Sent to the Data Object Broker in 31 KB Buffers
See Also
The External Environments manual for your operating environment for information on configuring the Execution Environment

Copyright © TIBCO Software Inc. All Rights Reserved
Copyright © TIBCO Software Inc. All Rights Reserved