JDBC and data source troubleshooting tips

To see whether your specific problem has been addressed, review the Cannot access a data source topic. If you cannot find your problem described there, investigate the problem further by using the following instructions to enable tracing for relevant WAS components.

This topic includes the following sections...

• Trace strings for JDBC data sources

• JDBC trace properties

 

Trace strings for JDBC data sources

Turn on JDBC tracing by using the following trace strings...

• com.ibm.ws.database.logwriter Trace string for databases that use the GenericDataStoreHelper. You can also use this trace string for unsupported databases.

• com.ibm.ws.db2.logwriter Trace string for DB2 databases.

• com.ibm.ws.oracle.logwriter Trace string for Oracle databases.

• com.ibm.ws.cloudscape.logwriter Trace string for Cloudscape databases.

• com.ibm.ws.informix.logwriter Trace string for Informix databases.

• com.ibm.ws.sqlserver.logwriter Trace string for Microsoft SQL Server databases.

• com.ibm.ws.sybase.logwriter Trace string for Sybase databases.

The trace group that includes the trace strings is WAS.database.

 

JDBC trace properties

Use a back-end database that supports JDBC tracing. Setting trace strings does not result in a trace if the database does not support JDBC tracing. The following databases offer JDBC tracing at this time:

• DB2

• Oracle

• SQL Server

Set the level of trace desired for DB2 Universal database and Oracle as custom properties on the datasource.

• DB2 Universal JDBC driver provider Custom properties for DB2 are...

  • traceLevel Possible traceLevel values are:

    • TRACE_NONE = 0

    • TRACE_CONNECTION_CALLS = 1

    • TRACE_STATEMENT_CALLS = 2

    • TRACE_RESULT_SET_CALLS = 4

    • TRACE_DRIVER_CONFIGURATION = 16

    • TRACE_CONNECTS = 32

    • TRACE_DRDA_FLOWS = 64

    • TRACE_RESULT_SET_META_DATA = 128

    • TRACE_PARAMETER_META_DATA = 256

    • TRACE_DIAGNOSTICS = 512

    • TRACE_SQLJ = 1024

    • TRACE_ALL = -1

      Note that This trace level provides real data that sets to the PreparedStatement or gets from the ResultSet object.

  • traceFile Use this property to integrate the DB2 trace with the WAS trace. If you do not set the value, traces are integrated. Otherwise, DB2 traces are directed to the desired file. You can dynamically enable or disable trace. You can run an application and turn on the DB2 trace if there is a problem. Use the run time trace enablement provided with the Application Server by specifying a trace string of com.ibm.ws.db2.logwriter=all=enabled.

• Oracle JDBC provider Custom properties for Oracle are...

  • oraclelogCategoryMask Controls the output category. The default is 47, which is (OracleLog.USER_OPER 1 | OracleLog.PROG_ERROR 2 | OracleLog.ERROR 4 | OracleLog.WARNING 8 | OracleLog.DEBUG1 32).

    Possible values are...

    • OracleLog.USER_OPER 1

    • OracleLog.PROG_ERROR 2

    • OracleLog.ERROR 4

    • OracleLog.WARNING 8

    • OracleLog.FUNCTION 16

    • OracleLog.DEBUG1 32

    • OracleLog.SQL_STR 128

  • oraclelogModuleMask Controls which modules write debug output. The default is 1, which is OracleLog.MODULE_DRIVER 1.

    Possible values are...

    • OracleLog.MODULE_DRIVER 1,

    • OracleLog.MODULE_DBACCESS 2

  • oraclelogPrintMask Controls which information to print with each trace message. The default is 62, which is ([OracleLog.FIELD_OBJECT for 9i / OracleLog.FIELD_CONN for 8i] 32 | OracleLog.FIELD_CATEGORY 16 | OracleLog.FIELD_SUBMOD 8 | OracleLog.FIELD_MODULE 4 | OracleLog.FIELD_TIME 2).

    Possible values are...

    • OracleLog.FIELD_TIME 2

    • OracleLog.FIELD_MODULE 4

    • OracleLog.FIELD_SUBMOD 8

    • OracleLog.FIELD_CATEGORY 16

    • OracleLog.FIELD_OBJECT 32

    • OracleLog.FIELD_THREAD 64

  Notes for Oracle JDBC tracing...

  1. Oracle 9i requires the use of classes12_g.zip to display traces. With Oracle8i, the classes12_g.zip is optional.

  2. You can dynamically enable or disable trace. You can run an application and turn on the Oracle trace if there is a problem. Use the run-time trace enablement provided with the WAS products, by specifying a trace string of com.ibm.ws.oracle.logwriter=all=enabled.

If JDBC tracing does not provide enough information to isolate and fix your problem, check to see if the problem has been identified and documented by looking at the available online support (hints and tips, technotes, and fixes). If you do not find your problem listed there, contact IBM Support.

For current information available from IBM Support on known problems and their resolution, see IBM Support page.

IBM Support has documents that can save you time gathering information needed to resolve this problem. Before opening a PMR, see IBM Support page.

 

See Also

Troubleshooting installation problems
Cannot access a data source

 

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