How to migrate the data in AS/400 to Oracle

I have a customer, they plan to migrate their data from AS/400 DB2 V5R3,V6R1 to Oracle 11g. Since the source system is in production, they can only halt for 48 hours,
which way is the fastest?
ORACLE workbench can only support to IBM DB2/400 V4R3 and V4R5, must we export the data from AS400 to ASCII then sql load to Oracle, the user data size is about 3T?
even get the initial data, how to capture the increased data? Oracle GoldenGate 11g can't access AS400 as source.

Hello,
An option would be to use the Database Gateway for DRDA. With this tool, all the data in the iSeries machine will be seen like an Oracle Table.
You will be able to run statements like :
INSERT INTO <Oracle_table> SELECT <col1, col2.....> FROM <iSeries_table>@AS400
or even like
CREATE TABLE <oracle_table> AS SELECT * FROM <iSeries_table>@AS400
The Database Gateway for DRDA is more an integration tool than a migration tool. You will be able to access live data on the AS/400 like this data was in Oracle
table(s). You can even modify the AS/400 data (insert, update, delete) from Oracle. This can avoid to have to do a one-time migration.
The Database Gateway for DRDA documentation is available at http://download.oracle.com/docs/cd/E11882_01/gateways.112/e12014/toc.htm

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o     Check all inactive InfoObjects:
Transaction RSD1 (Edit InfoObjects),
click on u201CAll InfoObjectsu201D radio button and click the u201CDisplayu201D button.
Modified InfoObjects are denoted by yellow triangles!
o     Determine if revision should be activated or removed.
     'Reorgu2019 or u2018Repairu2019 all InfoObjects
This checks and repairs any discrepancies in the InfoObject definition and structures. It is common to have obsolete DDIC and table entries for InfoObjects after multiple upgrades and definition changes. These obsolete entries normally do not effect normal SAP BW operations.
     Transaction RSD1 (Edit InfoObjects), Select u201CExecute Repairu201D or u201CExecute Reorgu201D Use expert mode for selective executions.
     BW
All ODS data loads must be activated.          Activate all inactivated ODS Object requests.
All ODS u2018Mu2019 tables must be emptied prior to the upgrade as a new activate process is implemented
o     Inactivated ODS request can be located via the Admin workbench -> u2018Monitoringu201D button -> u2018ODS Status Overviewu201D
     BW
All Transfer and Update rules should be active          Check for inactive Update and Transfer Rules
o     All update rules and transfer rules should be active or deleted.
o     Look into the table RSUPDINFO for update rules and search for the version "not equal" to "A". Likewise use the table RSTS for Transfer rules/structure.     BW
All InfoCubes should be active          Check for inactive InfoCubes and Aggregates (Aggregates are InfoCubes too!)
o     All InfoCubes should be activated or deleted.
o     Execute ABAP RSUPGRCHECK to locate any inactive InfoCubes. See SAP note 449160.
     BW
All Web Report objects should be consistent prior the upgrade.          Check the consistency of your SAP BW web objects (web reports, web templates, URLs, roles, etc). All objects should be consistent prior to web object conversion after the upgrade. It is recommended to ensure consistency before the upgrade.
o     For Original release SAP BW 3.x:
A SAP BW web reporting objects check can be executed via a new check in RSRV. This is provided via a SAP BW support package.
Please see SAP note 484519 for details.
     BW
Backup your system before starting PREPARE     Before execution PREPARE, perform a full database backup (including File system). Ensure you can recover to the point in time before PREPARE was executed.
     Database admin
Address any instructions/errors generated by PREPARE          Address any issues listed in log files Checks. Log generated by PREPARE.
o     Repeat PREPARE until all checks are successful.     Basis
Complete any Logistic V3 data extractions and suspend V3 collection processes          Extract and empty Logistics V3 extractor queues on SAP R/3 source systems.
o     The V3 extraction delta queues must be emptied prior to the upgrade to avoid any possible data loss. V3 collector jobs should be suspended for the duration of the upgrade.
They can be rescheduled after re-activation of the source systems upon completion of the upgrade.
     Note: If you perform any data loads after executing PREPARE, re-check the status of all delta queues in SAP BW and the source systems(s).
     BW
Complete any data mart data extractions and suspend any data mart extractors          Load and Empty all Data mart Delta Queues in SAP BW. (e.g. for all export DataSources)
o     The SAP BW Service SAPI, which is used for internal and u2018BW to BWu2019 data mart extraction, is upgraded during the SAP BW upgrade. Therefore, the delta queues must be emptied prior to the upgrade to avoid any possibility of data loss.
     Note: If you perform any data loads after executing PREPARE, re-check the status of all delta queues in SAP BW and the source systems(s).
     BW
Check that your customer defined data class definitions conform to SAP standards          Check all customer created Data classes used by SAP BW Objects (i.e. InfoCubes, ODS Objects, Aggregates, InfoObjects, and PSAs) to ensure they conform to SAP standards.
o     Check your data class definitions as detailed in SAP Notes 46272 and 500252.
o     Incorrect data classes could create activation errors during the upgrade.
     BW
Remove unnecessary SAP BW temporary database objects     Delete all SAP BW temporary database objects:
     Execute routine housekeeping ABAP SAP_DROP_TMPTABLES.
For more information see SAP note 308533 (2.x) and 449891 (3.x).
     This reduces the numbers of database objects that need to be copied during the upgrade.
     Note: take care not to delete objects that are in use as this will cause queries, compressions, etc to terminate.
     Basis/BW
Backups!     Before executing the upgrade, ensure that you have a backup strategy in place so you can return to the point where loading was completed and the upgrade started.
Ensuring you can return to a consistent point in time (without having to handle rollback or repeats of data loads) is key to having a successful fallback plan.
     Database Admin
Before Execution:
All SAP BW administration tasks should have ceased          Cease all SAP BW administration tasks such as Object maintenance, query/web template maintenance, data loads, transports, etc at the beginning of the upgrade.
The Administrators Workbench and the Data Dictionary are locked in the early phases of the upgrade.
     Reminder: Users can execute queries until the time that the upgrade determines that the SAP BW System should be closed*
- timing depends on the type of upgrade selected
     Basis/Admin
Remove unnecessary SAP BW temporary database objects     Repeat the deletion of all SAP BW temporary database objects after you have stopped using the SAP BW Admin workbench*
     Execute routine housekeeping ABAP SAP_DROP_TMPTABLES.
For more information see SAP note 308533 (2.x) and 449891 (3.x).
- timing depends on the type of upgrade selected
     BW
Check system parameters     Check OS, DB, and Instance profile parameters.
     Check System Instance parameters for new BI 7.0 specific parameters. See SAP note 192658 for details
     Check for any DB specific parameters for BI 7.0
     Check for any new OS parameters     Basis
Check Database archiving mode     Turn database archive log mode back on if it was disabled during the upgrade!
     Database Admin
After Execution:
Check the systemu2019s installation consistency     Execute Transaction SICK to check installation consistency
     BW
Check the system logs     Perform a technical systems check.
     Example: Check system and all dispatcher logs (inc. ICM logs)
     Basis
Apply latest executable binaries     Apply the latest 6.40 Basis Kernel for all executables
     Tip: use the SAP NetWeaver u201904 SP-Stack selection tool to find all binaries. (http://service.sap.com/swdc)
     Basis
Review BI 7.0 Support Packages for follow-up actions.          Review SAP Notes for all SAP BW Support packages applied during (bound into the upgrade) and applied after the upgrade:
o      Search for Note with the keyword u201CBWu201D, u201CSAPBWNEWSu201D, and u201C<BW release>u201D
o     Follow any required instructions identified in the SAP Notes
     Basis
Apply latest patches          Apply the latest SPAM patch
     Apply any required support packages that were not bound into the upgrade.
     Basis
Apply additional BI 7.0 Support Packages
(if required)          SAP recommends that customer remain current on SAP Support Packages.
     Review SAP Notes for all SAP BW Support packages applied in previous task.
o      Search for Notes with the keyword u201CBWu201D, u201CSAPBWNEWSu201D, and u201C<BW release>u201D
o     Follow any required instructions identified in the SAP Notes
     Basis
Resolve any modified SAP delivered Role issues      If SAP delivered Roles were modified, then these modifications may incorrectly appear in the upgrade modification adjustment tool (SPAU).
     Review and implement SAP note 569128 as required     Basis
Configuring Information Broadcasting EP/KMC Connections
     If you plan to use the EP integration functionality of Information broadcasting (Broadcast to the EPu2019s PCD, Broadcast to KMC, or Broadcast to Collaboration Rooms):
     Ensure the SAP EP is at the same SP-Stack level as your SAP BW system.
     Follow the online help documentation to configure and connect the SAP BW system and the SAP EP system. (http://help.sap.com).
     For broadcasting to KMC, ensure that KM has the u2018BEx Portfoliou2019 content available.
     Basis
Re-check SAP BW Object and consistency     Execute RSRV to check SAP BW Object consistency
     Repeat tests that we executed prior to the upgrade.
     Validate results      BW
Check InfoCube views for consistency     Check consistency of InfoCube fact table views
     It is possible that fact table view /BIC/V<InfoCube>F is missing if a number of SAP BW upgrades have been performed before. See SAP Note 525988 for instructions for the check and repair program.
     BW
Perform SAP BW Plug-in (SAPI) upgrade follow-up tasks          If required, Re-activate the SAP BW u201CMyselfu201D source system in SAP BW.
     The SAP BW internal plug-in (SAPI), which is used for internal data mart extraction and u2018BW to BWu2019 communication, is upgraded during the SAP BW upgrade. The source system is de-activated to prevent extractions and loading during the upgrade.
     It may be required to replicate export DataSources and reactivate transfer structures/rules for internal data loads (i.e. ODS Object to InfoCube objects).
o     Tip: It is advised to do this step for all export DataSources to avoid possible errors during execution of InfoPackages
     Check that all other Source Systems are active.
o     Activate as required.     Basis/BW
Check SAP BW Personalization is implemented     (SAP BW 2.X upgrades will have performed this in the previous task).
Validate that personalization has been activated in your SAP BW system.
Note: It has been observed that in some cases, BEx Personalization has to be re-activated after an upgrade from SAP BW 3.x to BI 7.0. It is advised to check the status of personalization after the upgrade.
     Enter the IMG (transaction SPRO), select SAP Business Warehouse -> Reporting relevant settings -> General Reporting Settings -> Activate Personalization in BEx
Check the status of the Personalization settings. All entries should be active u2013 highlighted by an unchecked check box.
     To activate highlighted Personalization, click Execute.     BW
For SAP BW 2.0B/2.1C -> BI 7.0 Upgrades:
Convert ODS secondary indexes to new standard     For SAP BW 2.0B/2.1C -> BI 7.0 Upgrades:
Convert any customer created ODS Object secondary indexes to the new ODS Object index maintenance process.
     Re-create all indexes in the ODS Object definition screen in transaction RSA1.
     ODS indexes must conform to the new naming convention
     BW
Converting IGS chart settings
     Convert you existing IGS chart settings (converts IGS chart settings from BLOB to new XML storage format)
     Ensure you have the latest SAP Web AS 6.40 IGS (stand alone windows version) installed and working
o      Test via transaction RSRT
     Execute the conversion process as directed the BI 7.0 upgrade guide.
     Note: This step is required for all BI 7.0 upgrades     Basis
Backup your SAP BW system     Perform a full database backup (including the File system)
Remember to adjust your backup scripts to include new components such as the J2EE engine, pre-calculation service, etc.
     Database Admin

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