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1.3 Data Flow Summary
When both source and target are OS/2 hosts, the DataHub/2 workstation
sends the copy command to the target using TC flows. The target fetches the
data from the source using RDS and inserts it into its local database.
Table 1 indicates the outbound protocol used for each function initiated by the
DataHub/2 workstation for the target host environment. The Copy Data and Copy
Data with load functions use several data flows, so we show them in a separate
table (Table 2). For example, for a copy with load from a DB2 host to an OS/2
DBM host, the request is sent to the OS/2 host using the TC flows. The OS/2 host
will copy and load using the DRDA flows.
If you have a DDCS/2 gateway system in your environment, the data flows
between the gateway and the DataHub/2 workstation are always RDS.
Table 1. Data Flows Used by Tool Functions. This table shows the data flows used
between the DataHub/2 workstation and the different hosts.
Function MVS Host VM Host AS/400
Host
Run (SQL) DRDA DRDA DRDA RDS
Run (JCL) TC N/A N/A N/A
Run (AS4SQL) N/A N/A TC N/A
Display RDBMS work TC TC TC N/A
Manage Authorizations DRDA DRDA TC/DRDA RDS
Display Status DRDA DRDA DRDA RDS
Load TC TC TC RDS
Unload TC TC TC RDS
Backup TC N/A TC N/A
Recover TC N/A TC N/A
Reorg TC N/A TC RDS
Update Statistics TC DRDA N/A RDS
Table 2. Data Flows Used by Copy Data
Copy Data Steps MVS Host VM Host AS/400
Host
Object Creation
(non-OS/2)
Copy Data
(non-OS/2)
Object Creation
(OS/2 source)
Copy Data
(OS/2 source)
Copy Data
(OS/2 target)
DRDA DRDA DRDA N/A
TC/DRDA TC/DRDA TC/DRDA N/A
RDS/DRDA RDS/DRDA RDS/DRDA RDS
OS/2 Host
OS/2 Host
TC/DRDA TC/DRDA TC/DRDA TC/RDS
TC/DRDA TC/DRDA TC/DRDA TC/RDS
Chapter 1. Introduction to DataHub 17