SQL Server: Compare Query Results - Part I

Wednesday Nov 3rd 2004 by Muthusamy Anantha Kumar aka The MAK
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In the Database administration world, it is often necessary to run a query on the production box and then run the same query on the QA or UAT box and compare the results. In this article, MAK introduces a method that takes advantage of an MS-DOS batch file and SQL Server utility, BCP.exe, to compare the query results executed on two different servers.

In the Database administration world, it is often necessary to run a query on the production box and then run the same query on the QA or UAT box and compare the results. In this article, I would like to introduce a method that takes advantage of an MS-DOS batch file and SQL Server utility, BCP.exe, to compare the query results executed on two different servers.

Pre-Requisite

SQL Server 2000 client and latest service pack should be installed on the machine where you are running the batch file.

Step 1

Create the folder, c:\compare, as shown in Fig 1.1


Fig 1.1



Step 2

Create c:\compare\compare.bat and copy and paste the below code into it. Save the file. [Fig 1.2]

@echo off
REM Objective: To compare results of a query on two different server
REM Created by: MAK
REM Date: Oct 2, 2004
Echo ...
Echo ...
Echo ...

REM Check parameters
if "%1"=="" Goto noparmErr
if "%1"=="/?" Goto Help

REM assign variables
set server1=%1
set login1=%2
set pwd1=%3
set server2=%4
set login2=%5
set pwd2=%6
set Query=%7
set LogFile=%8
set outfile1="C:\Compare\Outfile1.txt"
set outfile2="C:\Compare\Outfile2.txt"
set DiffFile="C:\Compare\DiffFile.txt"

Echo "Compare Query results started" >%LogFile%
date/t >> %LogFile%
time/t >> %LogFile%

Echo .... >> %LogFile%
Echo Attempting to delete %outfile1%  >> %LogFile%
IF EXIST %outfile1% (del /Q %outfile1% ) ELSE echo %outfile1% not found. Skipping  
delete.
Echo Delete process Completed  >> %LogFile%
Echo .... >> %LogFile%
Echo Attempting to delete %outfile2%  >> %LogFile%
IF EXIST %outfile2% (del /Q  %outfile2% ) ELSE echo %outfile2% not found. Skipping  
delete.
Echo Delete process Completed  >> %LogFile%
Echo .... >> %LogFile%
Echo Attempting to delete %DiffFile%  >> %LogFile%
IF EXIST %DiffFile% (del  /Q %DiffFile% ) ELSE echo %DiffFile% not found. Skipping  
delete.
Echo Delete process Completed  >> %LogFile%
Echo .... >> %LogFile%

:BCP1
Echo .... >> %LogFile%
Echo "Attempting to BCP out the given query from the server :: %Server1%" >>  
%LogFile%
bcp.exe %Query% QUERYOUT %outfile1% -S%server1% -U%login1% -P%pwd1% -c  >>%LogFile%

:BCP2
Echo .... >> %LogFile%
Echo "Attempting to BCP out the given query from the server :: %Server2%" >>  
%LogFile%
bcp.exe %Query% QUERYOUT %outfile2% -S%server2% -U%login2% -P%pwd2% -c  >>%LogFile%

:Compare
Echo "Comparing  %outfile1% and %outfile2% " >> %LogFile%
Fc.exe %outfile1% %outfile2% > %DiffFile%

:Search
Echo "Finding the difference" >> %LogFile%
find.exe "FC: no differences encountered" %DiffFile% >> %LogFile%
if "%errorlevel%"=="0" echo "Both results are same. Check the file %DiffFile% for  
differences and Log file %LogFIle%" 
if "%errorlevel%"=="1" echo "Results are differnt. Check the file %DiffFile% for  
differences" 

Goto END

:noparmErr
Echo No Parameters specified..... Usage example as follows
echo ...
Echo %0 Server1 Login1 Password1 Server2 login2 password2 "select top 10 * from  
master..sysobjects" x.txt
Goto END

:Help
Echo Usage help: example as follows
echo ...
Echo Objective: To compare results of a query on two different server
Echo Created by: MAK
Echo %0 Server1 Login1 Password1 Server2 login2 password2 "select top 10 * from  
master..sysobjects" x.txt
Goto END

:END
Echo "Compare Query results Completed" >>%LogFile%
date/t >> %LogFile%
time/t >> %LogFile%

Download compare.bat


Fig 1.2



Step 3

Execute the batch file by passing right parameters as shown in Fig 1.3



Click for larger image

Fig 1.3



When the compare.bat file is executed, it bcp's out the query results from the first server to c:\compare\outfile1.txt, then it bcp's out the query results from the second server to c:\compare\outfile2.txt. Then it finds the difference between c:\compare\outfile1.txt and c:\compare\outfile2.txt using MS-DOS's fc.exe. It also create log file and gathers information as shown below. [Fig 1.4]



"Compare Query results started" 
Sun 10/03/2004 
 2:28a
.... 
Attempting to delete 
  "C:\Compare\Outfile1.txt"  
Delete process Completed  
.... 
Attempting to delete 
  "C:\Compare\Outfile2.txt"  
Delete process Completed  
.... 
Attempting to delete 
  "C:\Compare\DiffFile.txt"  
Delete process Completed  
.... 
.... 
"Attempting to BCP out the given query from the server :: sql" 

Starting copy...

1 rows copied.
Network packet size (bytes): 4096
Clock Time (ms.): total        1
.... 
"Attempting to BCP out the given query from the server :: ebony" 

Starting copy...

1 rows copied.
Network packet size (bytes): 4096
Clock Time (ms.): total        1
"Comparing  "C:\Compare\Outfile1.txt" and "C:\Compare\Outfile2.txt" " 
"Finding the difference" 

---------- C:\COMPARE\DIFFFILE.TXT
FC: no differences encountered

"Compare Query results Completed" 
Sun 10/03/2004 
 2:30a


Fig 1.4

It also displays whether the query results are same. Fig 1.5]


Fig 1.5

Parameters of Compare.bat explained

Compare.bat sql sa yeahright ebony sa yeahright2 "select * from sysobjects 
  where name <>'sysobjects'" x.txt

Compare.bat = batch file name

Sql = First SQL server box

Sa = Login for the First SQL Server box

Yeahright = Password for Sa

Ebony = Second SQL server box

Sa = Login for the second SQL Server box

"select ...." = Query to be executed on both SQL server boxes.

Yeahright2 = Password for Sa

x.txt = Log File name

You can also get the usage example information by executing compare.bat without any parameters or with /? As parameter. [Fig 1.6 and Fig 1.7]


Fig 1.6


Fig 1.7

Conclusion

This article has introduced a method on how to take advantage of an MS-DOS batch file and SQL Server utility BCP.exe to compare the query results executed on two different servers. Part II of this article will examine how to compare results of the same query on the same or different servers, but on different databases.

» See All Articles by Columnist MAK

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