Earlier, I wrote an article about how to migrate from a Multi Data source (MDS) for RAC connectivity to Active GridLink (AGL). This is needed to move from the older datasource technology to the newer technology, both supporting Oracle RAC. The information is now in the public documentation set at Migrating from Multi Data Source to Active GridLink .
There are also many customers that are growing up from a standalone database to an Oracle RAC cluster. In this case, it’s a migration from a GENERIC
datasource to an AGL datasource. This migration is pretty simple.
No changes should be required to your applications. A standard application looks up the datasource in JNDI and uses it to get connections. The JNDI name won’t change.
The only changes necessary should be to your configuration and the necessary information is generally provided by your database administrator. The information needed is the new URL and optionally the configuration of Oracle Notification Service (ONS) on the RAC cluster. The latter is only needed if you are running with
- an 11g driver or 11g database. Auto-ONS depends on protocol flowing between the driver and the database server
and this feature was added in 12c.
- pre-WLS 12.1.3. Auto-ONS is supported starting in WLS 12.1.3. Read the complete article here.
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