TDatabase.TraceFlags Property

Specifies the database operations to track with the SQL Monitor at runtime.

Pascal

property TraceFlags: TTraceFlags;

C++

__property TTraceFlags TraceFlags;

Description

Use TraceFlags to specify which database operations the SQL Monitor should track in an application at runtime. TraceFlags is only meaningful for the SQL Monitor, which is provided to enable performance tuning and SQL debugging when working with remote SQL database servers.

Note: Normally trace options are set from the SQL Monitor rather than setting TraceFlags in application code.

The value of a session component's TraceFlags property determines the initial settings of the TraceFlags property for database components associated with the session.

The TTraceFlags type defines the individual values that can be included in the TraceFlags property. The following table summarizes those values:

Values	Meaning
tfQPrepare	Monitor Prepare statements.
tfQExecute	Monitor ExecSQL statements.
tfError	Monitor server error messages. Such messages may include an error code.
tfStmt	Monitor all SQL statements.
tfConnect	Monitor database connect and disconnect operations, including allocation of connection handles, and freeing connection handles.
tfTransact	Monitor transaction statements, such as StartTransaction, Commit, and Rollback.
tfBlob	Monitor operations on blob data types.
tfMisc	Monitor any statements not covered by other flag options.
tfVendor	Monitor direct API function calls to the database server.
tfDataIn	Monitor data received from a server.
tfDataOut	Monitor data sent to a server.

Because TraceFlags is a set property, an application can specify different combinations of flags to monitor different combinations of statements. For example, the following statement limits monitoring to database connections and SQL statement preparation:

Copy Code

TraceFlags := [tfConnect, tfQPrepare];

Copy Code

TraceFlags  << tfConnect << tfQPrepare;