JDBC mediator performance considerations and limitations

Use these tips to help you determine if a JDBC Data Mediator Service suits the requirements of your application serving environment.

Driver requirements for using SDO to access DB2 UDB for iSeries

Because the SDO JDBC Mediator takes advantage of the ResultSetMetaData interface in JDBC 2.0, it must use JDBC providers that are fully compliant with that specification. Both the IBM® Developer Kit for Java JDBC driver (also known as the DB2 UDB for iSeries Native driver) and the IBM Toolbox for Java JDBC driver meet this criteria for JDBC access to DB2 UDB for iSeries. For performance reasons, however, neither of these drivers have default settings to return all the information that the mediator requires. You must set a connection property on the JDBC provider or data source that corresponds to each driver for it to return full ResultSetMetaData data sets.
The property you use varies according to how your driver implementation acquires database connections.
  • If your driver gets connections through the DriverManager class, set the JDBC provider URL property extended metadata to true: extended metadata=true. In this scenario, both the IBM Developer Kit for Java and IBM Toolbox for Java JDBC drivers require the same setting on the JDBC provider object.
  • If your application acquires connections through a data source, set a different custom property on the data source, depending on the driver that you use:
    • For the IBM Toolbox for Java JDBC driver, set the custom property extendedMetaData to true.
    • For the IBM Developer Kit for Java JDBC driver, set the custom property returnExtendedMetaData to true.

Miscellaneous database limitations

General performance recommendations




Related reference
JDBC mediator generated query
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