Profiling ODBC Driver Performance Data

Article
01/10/2024

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)

This sample shows the SQL Server ODBC driver-specific options to record performance statistics. The sample creates one file: odbcperf.log.This sample shows both the creation of a performance data log file and displaying performance data directly from the SQLPERF data structure (The SQLPERF structure is defined in Odbcss.h.). This sample was developed for ODBC version 3.0 or later.

Important

When possible, use Windows Authentication. If Windows Authentication is not available, prompt users to enter their credentials at run time. Avoid storing credentials in a file. If you must persist credentials, you should encrypt them with the Win32 crypto API.

To log driver performance data using ODBC Administrator

In Control Panel, double-click Administrative Tools and then double-click Data Sources (ODBC). Alternatively, you can invoke odbcad32.exe.
Click the User DSN, System DSN, or File DSN tab.
Click the data source for which to log performance.
Click Configure.
In the Microsoft SQL Server Configure DSN Wizard, navigate to the page with Log ODBC driver statistics to the log file.
Select Log ODBC driver statistics to the log file. In the box, place the name of the file where the statistics should be logged. Optionally, click Browse to browse the file system for the statistics log.

To log driver performance data programmatically

Call SQLSetConnectAttr with SQL_COPT_SS_PERF_DATA_LOG and the full path and file name of the performance data log file. For example:
```
"C:\\Odbcperf.log"  
```
Call SQLSetConnectAttr with SQL_COPT_SS_PERF_DATA and SQL_PERF_START to start logging performance data.
Optionally, call SQLSetConnectAttr with SQL_COPT_SS_LOG_NOW and NULL to write a tab-delimited record of performance data to the performance data log file. This can be done multiple times as the application runs.
Call SQLSetConnectAttr with SQL_COPT_SS_PERF_DATA and SQL_PERF_STOP to stop logging performance data.

To pull driver performance data into an application

Call SQLSetConnectAttr with SQL_COPT_SS_PERF_DATA and SQL_PERF_START to start profiling performance data.
Call SQLGetConnectAttr with SQL_COPT_SS_PERF_DATA and the address of a pointer to a SQLPERF structure. The first such call sets the pointer to the address of a valid SQLPERF structure that contains current performance data. The driver does not continually refresh the data in the performance structure. The application must repeat the call to SQLGetConnectAttr any time it needs to refresh the structure with more current performance data.
Call SQLSetConnectAttr with SQL_COPT_SS_PERF_DATA and SQL_PERF_STOP to stop logging performance data.

Example

You will need an ODBC data source called AdventureWorks, whose default database is the AdventureWorks sample database. (You can download the AdventureWorks sample database from the Microsoft SQL Server Samples and Community Projects home page.) This data source must be based on the ODBC driver that is supplied by the operating system (the driver name is "SQL Server"). If you will build and run this sample as a 32-bit application on a 64-bit operating system, you must create the ODBC data source with the ODBC Administrator in %windir%\SysWOW64\odbcad32.exe.

This sample connects to your computer's default SQL Server instance. To connect to a named instance, change the definition of the ODBC data source to specify the instance using the following format: server\namedinstance. By default, SQL Server Express installs to a named instance.

Compile with odbc32.lib.

// compile with: odbc32.lib  
#include <stdio.h>  
#include <string.h>  
#include <windows.h>  
#include <sql.h>  
#include <sqlext.h>  
#include <odbcss.h>  
  
SQLHENV henv = SQL_NULL_HENV;  
SQLHDBC hdbc1 = SQL_NULL_HDBC;       
SQLHSTMT hstmt1 = SQL_NULL_HSTMT;  
  
void Cleanup() {  
   if (hstmt1 != SQL_NULL_HSTMT)  
      SQLFreeHandle(SQL_HANDLE_STMT, hstmt1);  
  
   if (hdbc1 != SQL_NULL_HDBC) {  
      SQLDisconnect(hdbc1);  
      SQLFreeHandle(SQL_HANDLE_DBC, hdbc1);  
   }  
  
   if (henv != SQL_NULL_HENV)  
      SQLFreeHandle(SQL_HANDLE_ENV, henv);  
}  
  
int main() {  
   RETCODE retcode;  
  
   // Pointer to the ODBC driver performance structure.  
   SQLPERF *PerfPtr;  
   SQLINTEGER cbPerfPtr;  
  
   // Allocate the ODBC environment and save handle.  
   retcode = SQLAllocHandle (SQL_HANDLE_ENV, NULL, &henv);  
   if( (retcode != SQL_SUCCESS_WITH_INFO) && (retcode != SQL_SUCCESS)) {  
      printf("SQLAllocHandle(Env) Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Notify ODBC that this is an ODBC 3.0 app.  
   retcode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER) SQL_OV_ODBC3, SQL_IS_INTEGER);  
   if( (retcode != SQL_SUCCESS_WITH_INFO) && (retcode != SQL_SUCCESS)) {  
      printf("SQLSetEnvAttr(ODBC version) Failed\n\n");  
      Cleanup();  
      return(9);      
   }  
  
   // Allocate ODBC connection handle and connect.  
   retcode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc1);  
   if( (retcode != SQL_SUCCESS_WITH_INFO) && (retcode != SQL_SUCCESS)) {  
      printf("SQLAllocHandle(hdbc1) Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // This sample use Integrated Security. Please create the SQL Server   
   // DSN by using the Windows NT authentication.   
   retcode = SQLConnect(hdbc1, (UCHAR*)"AdventureWorks", SQL_NTS, (UCHAR*)"", SQL_NTS, (UCHAR*)"", SQL_NTS);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLConnect() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Set options to log performance statistics.  Specify file to use for the log.  
   retcode = SQLSetConnectAttr( hdbc1, SQL_COPT_SS_PERF_DATA_LOG, &"odbcperf.log", SQL_NTS);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLSetConnectAttr() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Start the performance statistics log.  
   retcode =   
      SQLSetConnectAttr( hdbc1, SQL_COPT_SS_PERF_DATA, (SQLPOINTER)SQL_PERF_START, SQL_IS_UINTEGER);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLSetConnectAttr() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Allocate statement handle, then execute command.  
   retcode = SQLAllocHandle(SQL_HANDLE_STMT, hdbc1, &hstmt1);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLAllocHandle() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   retcode = SQLExecDirect(hstmt1, (UCHAR*)"SELECT * FROM Purchasing.Vendor", SQL_NTS);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLExecDirect() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Clear any result sets generated.  
   while ( ( retcode = SQLMoreResults(hstmt1) ) != SQL_NO_DATA ) {  
      if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
         printf("SQLMoreResults() Failed\n\n");  
         Cleanup();  
         return(9);  
      }  
   }  
  
   retcode = SQLExecDirect(hstmt1, (UCHAR*)"SELECT * FROM Sales.Store", SQL_NTS);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLExecDirect() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Clear any result sets generated.  
   while ( ( retcode = SQLMoreResults(hstmt1) ) != SQL_NO_DATA ) {  
      if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
         printf("SQLMoreResults() Failed\n\n");  
         Cleanup();  
         return(9);  
      }  
   }  
  
   // Generate a long-running query.  
   retcode = SQLExecDirect(hstmt1, (UCHAR*)"waitfor delay '00:00:04' ", SQL_NTS);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLExecDirect() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Clear any result sets generated.  
   while ( ( retcode = SQLMoreResults(hstmt1) ) != SQL_NO_DATA ) {  
      if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
         printf("SQLMoreResults() Failed\n\n");  
         Cleanup();  
         return(9);  
      }  
   }  
  
   // Write current statistics to the performance log.  
   retcode =   
      SQLSetConnectAttr( hdbc1, SQL_COPT_SS_PERF_DATA_LOG_NOW, (SQLPOINTER)NULL, SQL_IS_UINTEGER);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLSetConnectAttr() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   // Get pointer to current SQLPerf structure.  
   // Print a couple of statistics.  
   retcode =   
      SQLGetConnectAttr( hdbc1, SQL_COPT_SS_PERF_DATA, (SQLPOINTER)&PerfPtr, SQL_IS_POINTER, &cbPerfPtr);  
   if( (retcode != SQL_SUCCESS) && (retcode != SQL_SUCCESS_WITH_INFO) ) {  
      printf("SQLGetConnectAttr() Failed\n\n");  
      Cleanup();  
      return(9);  
   }  
  
   printf("SQLSelects = %d, SQLSelectRows = %d\n", PerfPtr->SQLSelects, PerfPtr->SQLSelectRows);  
  
   // Cleanup  
   SQLFreeHandle(SQL_HANDLE_STMT, hstmt1);  
   SQLDisconnect(hdbc1);  
   SQLFreeHandle(SQL_HANDLE_DBC, hdbc1);  
   SQLFreeHandle(SQL_HANDLE_ENV, henv);  
}

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Profiling ODBC Driver Performance Data

To log driver performance data using ODBC Administrator

To log driver performance data programmatically

To pull driver performance data into an application

Example

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