If you upgrade from a pre-9.5.0 version of Informatica MDM Multidomain Edition, the ZDT upgrade process consists of a readiness cycle and an upgrade cycle. The ZDT readiness cycle is similar to the ZDT advance cycle. However, the ZDT readiness cycle does not change the schema and does not migrate the data. The readiness cycle is a separate cycle from the upgrade cycle because the combined readiness and upgrade cycles may produce too many GoldenGate logs to replay.
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If you upgrade from a post-9.5.0 version of MDM Multidomain Edition, the ZDT upgrade process just consist of the upgrade cycle.
ZDT uses a duplicate inactive environment to perform the upgrade while letting the active environment provide for user processing. Golden Gate is the tool that provides replication from the active environment to the passive environment.
The ZDT upgrade process upgrades the passive environment so that there is no impact to the active environment. ZDT provides multiple interfaces to allow exchange between environments and to allow for message between the environments. Any change made to the MDM Hub through the upgrade does not impact the ability to replicate changes from the active environment. Backfill mechanisms handle any impact to the MDM Hub metadata caused by the upgrade.
Prerequisites for ZDT
Earlier than you upgrade the MDM Hub with ZDT, confirm that you installed the right Golden Gate version:
MDM Hub Version - 9.0.1 to 9.7.1
Supported GoldenGate Version - GoldenGate 11.2.1
MDM Hub Version - 9.7.1 or later
Supported GoldenGate Version - GoldenGate 126.96.36.199
Upgrade with Zero Downtime Overview
Perform the readiness cycle and upgrade cycle to upgrade from a pre-9.5.0 version of MDM Hub to a post-9.5.0 version of MDM Hub. You do not need to make the readiness cycle if you only upgrade the hardware, upgrade non-MDM software, upgrade the ORS schema, or apply an EBF or hotfix. You also do not require to perform the readiness cycle if you upgrade from a post-9.5.0 version of MDM Multidomain Edition.
Zero Downtime readiness cycle
You must run the readiness cycle when you upgrade from a pre-9.5.0 version of the MDM Hub software to a post-9.5.0 version. The readiness cycle contains the steps to recognize the data problem that you must resolve before proceeding to the Zero Downtime (ZDT) upgrade cycle. The readiness cycle does not need backfill after completion.
You must complete the steps controlled from the passive environment before you continue to the steps controlled from the active environment. After the readiness cycle is complete, switch the environments to make the passive environment the active environment.
Zero Downtime upgrade cycle
Run the steps for the ZDT upgrade cycle from a command line interface, such as shell scripts, or a command-line job scheduler. The upgrade runs from a single flow of control to allow for almost full automation of the upgrade process.
The ZDT upgrade cycle procedure provides steps for messaging between the active environment and passive environment, preserve replication control, and integrating backfill.
If you upgrade from a pre-9.5.0 version of MDM Multidomain Edition, the Zero Downtime upgrade cycle modify the schema data structure and migrates the data.