How does DDM support distributed data management overview?
How does DDM support distributed data management overview?
When an application program first attempts to access a remote file: A search for the requested DDM file is done on the source system. Note: No library name, the library list for the job is searched for the specified file. When the file is found, the system accesses the file, determines that it is a DDM file, and starts the SDDM.
How are DDM messages returned to the user?
(However, in error conditions, messages are returned to the user that indicate, when necessary, that a remote system was accessed.) Informational messages about the use of target system files are included in the source system’s job log. DDM can be used to communicate between systems that are architecturally different.
Do you need to support DDM as a target system?
The attached system must support DDM as a target system. However, the source and target systems must support compatible subsets and levels of the DDM architecture. When DDM is in use, neither the application program nor the program user needs to know if the file exists locally or on a remote system.
How does a DDM server work with a tddm server?
A port pair is opened between the two systems in the same manner as most other TCP/IP applications. The target system must have the DDM server running in order to become the “server” for the connection, while the source system acts as the “client”. After the TDDM is started: SDDM can forward each program request to the target job for processing.
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When an application program first attempts to access a remote file: A search for the requested DDM file is done on the source system. Note: No library name, the library list for the job is searched for the specified file. When the file is found, the system accesses the file, determines that it is a DDM file, and starts the SDDM.
When does a DDM file appear in a database?
As a database file: Appears to the application program as a database file and serves as the access device between a source system program and a remote file. When an application program first attempts to access a remote file: A search for the requested DDM file is done on the source system.
(However, in error conditions, messages are returned to the user that indicate, when necessary, that a remote system was accessed.) Informational messages about the use of target system files are included in the source system’s job log. DDM can be used to communicate between systems that are architecturally different.
