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Conference ulysse::rdb_vms_competition

Title:DEC Rdb against the World
Moderator:HERON::GODFRIND
Created:Fri Jun 12 1987
Last Modified:Thu Feb 23 1995
Last Successful Update:Fri Jun 06 1997
Number of topics:1348
Total number of notes:5438

627.0. "Write to IBM DB2 database from VAX/VMS?" by IJSAPL::WOODROW (Father of DRS) Wed Apr 25 1990 15:12

A customer would like to be able to read /and/ write to a DB2 database
from VAX/VMS but VIDA will not currently allow this. ORACLE is a 
possibility, I understand, but will /not/ be recommended. Is there any
other product (not terribly competitive) that offers this capability?

Thanks,
Peter
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627.1Yes, But...BANZAI::BOOTHWhat am I?...An Oracle?Wed Apr 25 1990 15:169
    For the record, Oracle can only update the DB2 database IF the Oracle
    RDBMS is installed on the IBM side. That is, the update goes Oracle/VAX
    to Oracle/IBM, then Oracle/IBM to DB2.
    
    I think Ingres is read/write to DB2. However, as I understand it, any
    write from the VAX side gives the IBM DBA some real grief if a system
    crash occurs. Recovery would not be simple.
    
    ---- Michael Booth
627.2Focus & Sterling perhapsMAIL::DUNCANGGerry Duncan @KCO - DTN 452-3445Fri Apr 27 1990 14:069
    Check with Focus.  They claim to be able to read/write to DB2 but I'm
    not clear on whether or not ANY application (or just Focus
    applications) can use their software.
    
    Also, you may want to check with Sterling software (authors of the IBM
    side of VAXlink).  They may have something but it will probably be
    batch oriented.
    
    -- gerry
627.3More on ORACLE and INGRESSQLRUS::THOMASMon Apr 30 1990 19:149
    Just to add a little more info to Mike's reply --
    
    ORACLE's SQL*Connect does support update of DB2 databases, under 2
    conditions:  ORACLE DBMS must be installed on the IBM system, AND
    the DB2 table must be varied offline to DB2 users until the ORACLE
    update is committed.
    
    The current version of the INGRES gateway to DB2 does not support 
    update.
627.4Let IBM do itIJSAPL::OLTHOFHenny Olthof @UTO 838-2021Fri May 04 1990 09:256
    If updating a DB2 database from an Rdb database is the issue and it
    does not need to be online, IBM offers products that will read Rdb data
    into a DB2 database (check with other notes for the product name).
    
    Henny
    
627.5Methods that can update IBMSQLRUS::THOMASTue May 08 1990 01:2916
    We have a number of mechanisms to allow VAX/VMS applications to update
    IBM data:
    
    1.  Use RJE to transfer a transaction to the IBM.  RJE will schedule to 
        job to update the database of choice.
    2.  Write cooperative applications using DECnet/SNA VMS APPC/LU6.2 PI.
        An application on the VAX initiates a conversation with an
        application running in CICS.  The CICS application can perform the
        updates.
    3.  Write applications to interface with existing IBM applications
        using DECnet/SNA VMS 3270 Datastream PI.  The VMS application
        passes 3270 screens of data to an IBM-based application.
    4.  Use DTF to transfer files to the IBM system, then execute an IBM
        application to read the data and update the databases.
    5.  Use IBM's DXT/D1 to extract data from VAX/VMS-based databases
        (Rdb, RMS, or ORACLE) and create DB2 or SQL/DS tables.