November 2001
Intermediate to advanced
496 pages
13h 51m
English
Content preview from Java Programming with Oracle JDBC
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Net8 Tracing
If you use the OCI driver, you can configure Net8 to trace your database communications. You can enable Net8 tracing on both the client and the server. Keep in mind, however, that enabling Net8 tracing translates into a substantial performance hit.
Client-Side Tracing
To enable client tracing, you add four parameters to your
sqlnet.ora file, which is located in your
$ORACLE_HOME\network\admin directory. The first
of the four parameters is TRACE_LEVEL_CLIENT, and you can set it to
one of the following four values:
| 0 or OFF |
| 4 or USER |
| 10 or ADMIN |
| 16 or SUPPORT |
For example, to turn tracing on and get the most amount of information, specify the following:
TRACE_LEVEL_CLIENT = SUPPORT
To turn tracing off, which you definitely want to do after your debugging session is complete, use 0 or OFF:
TRACE_LEVEL_CLIENT = OFF
The second parameter, TRACE_DIRECTORY_CLIENT, is used to specify the directory for the client-side trace files. Typically, this parameter is set as:
TRACE_DIRECTORY_CLIENT = $ORACLE_HOME/network/trace
You can, however, select any directory you wish as the destination directory for trace files.
Warning
On Windows machines, do not set TRACE_DIRECTORY_CLIENT to the root directory of a drive (e.g., c:\). If you do so, you won’t get any trace files even with tracing turned on.
The third parameter is TRACE_UNIQUE_CLIENT. This parameter can be set to ON or OFF. If you set it to OFF, then each session will use and overwrite the trace file. If it is set to ON, then the driver will append ...
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