WebLogic Server and PDB Switching with Oracle Database 12.1

Oracle WebLogic Server 12c (12.1.2) has integrated to support the Oracle Database 12c features, particularly Application Continuity, Transaction Guard, Database Resident Connection Pool, Multi Tenant Databases, and Global Data Services. WLS integration to these new 12c database features is described in this blog

https://blogs.oracle.com/WebLogicServer/entry/new_whitepaper_cloud_performance_elasticity.

The integration to Multi Tenant Database or Pluggable Database increases elasticity, scalability, and enables multitenancy. Pluggable Database implementations allow multiple distinct databases in a single, larger database installation. The Container Database (CDB) feature in Oracle Database 12c minimizes the overhead of these multi-database configurations by consolidating them into a single database with multiple Pluggable Databases (PDB) in a single Container Database. For more information about using this feature in WLS, see https://blogs.oracle.com/WebLogicServer/entry/part_3_12c_database_and

You should be aware of some limitations of PDB switching with Oracle Database 12.1. The following WebLogic Server limitations exist when using tenant switching.

  • FAN is not supported. Even though FAN is not supported, Active GridLink still provides the benefit of a single datasource view of multiple RAC instances and the ability to reserve connections on new instances as they are available without reconfiguration using connection load balancing. If you want to use tenant switching with an Active GridLink data source, “FAN enabled” must be set to false see http://docs.oracle.com/middleware/1212/wls/JDBCA/gridlink_datasources.htm#CHDIAGEF . Generic data sources don’t use FAN so this restriction doesn’t apply.

  • DRCP is not supported

  • Application continuity is not supported.

  • Proxy authentication is not supported.

  •  XA transactions in one datasource configuration with PDB switching is not supported.

For more details about these limitations read the documentation http://docs.oracle.com/middleware/1212/wls/JDBCA/ds_oracledriver.htm#JDBCA655.

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