Release 10.1A: OpenEdge Data Management:
DataServer for ODBC

Analyzing performance

The qt_debug option of the DataServer (-Dsrv) startup parameter (and the QUERY–TUNING DEBUG phrase) instructs the DataServer to print information on the queries it generates to the dataserv.lg log file. The qt_debug option provides extended diagnostic capabilities that you can use to determine which parts of your application might be causing additional network traffic or extra processing by the ODBC data source. Table 4–4 lists the diagnostic capabilities of qt_debug. Note that the log file uses the numeric values (in parentheses) to identify information that a specific option generates.

Table 4–4: Diagnostic options 

Option	Description
qt_no_debug	Supplies no debug information. This is the default.
qt_debug,SQL	Prints the SQL statements that the DataServer executes against the data source.
qt_debug,EXTENDED	Prints the SQL statements that the DataServer executes against the data source plus additional information such as cursor statistics.
qt_debug,CURSOR	Prints information about the cursors that the DataServer uses for internal calls and for opening queries. It tracks when cursors open and close and when the DataServer reuses them. It also summarizes each cursor’s activity. These diagnostics are especially helpful when determining OpenEdge maximum cursor settings or cursor “leaks” that your application might have.
qt_debug,PERFORMANCE	Prints information on the amount of time that certain operations take. These statistics are available only for some platforms. Note that any time differences between what the DataServer reports and what a data source reports might be due to network performance issues rather than to DataServer or data-source behavior.
qt_debug,CALL_SUMMARY	Prints information on cursors and timing. This information is supplied in summary form as an OpenEdge data (.d) file. Call Progress Software Corporation Consulting for assistance with this file. Note: This option is not available as a QUERY–TUNING phrase option.
qt_debug,VERBOSE	Prints all of the information gathered by the other qt_debug options. Note: This option generates a very large log file. Be sure to clear your log file before using this option to test a procedure.

Note: Turning on debugging options decreases DataServer performance. Be sure to turn off debugging options when you run DataServer applications in production mode.

This connection statement causes the DataServer to report on the time that ODBC operations take:

CONNECT odbcdb -U password -Dsrv qt_cache_size,32000,qt_debug,PERFORMANCE.