Hi all,
In loadrunner to capture the Dyanmic value in each run of 
the script execution.
Two types of correlation are there in loadrunner.
1.Auto correlation 2.manual correlaion
The function of correlation is Web_reg_save_param("param 
name","Lb=","RB=","ORD=",LAST);

Hi this is chandana,

          raja can u explain me Lb,Rb,ord means plz

ra is LB, ja is RB  and a is ord
like a is mention where is in the entire URL

Hi chandana,

r is LB, ja is RB  and a is ord
like a is mention where it is on the entire URL

LR means Left boundary, Rb means Right boundary, ord means 
ordinal position.

LR means Left boundary, Rb means Right boundary, ord means 
ordinal position.

Correlation is used to obtain data which are unique for each
run of the script and which are generated by nested queries.
Correlation provides the value to avoid errors arising out
of duplicate values and also optimizing the code (to avoid
nested queries).

In loadrunner to capture the Dyanmic value in each run of 
the script execution.
Two types of correlation are there in loadrunner.
1.Auto correlation 2.manual correlaion
The function of correlation is Web_reg_save_param("param 
name","Lb=","RB=","ORD=",LAST);

web = webapplication(HTTP)
reg = Regestration
save = saving the next comming dynamic value into the       
parameter name
param = parameter

The web_reg_save_param() function registers a request to 
retrivew dynamic information from the downloaded page and 
save it to the above mentoned parameter name.
1.parameter name:-it captures the newly server generated 
value and replace through the script.
LB: it indicates the left boundary value of the correlted 
value.
RB: it indicates the right boundary value of the correlated 
value.
ORD value: ordinal vlue. The specific position of the 
correlated value with the left and right boundary match 
cases.

Process for Auto and manual corelation : 

Auto Correlation Process: once u execute the scripts and 
click Ctrl+f8 system displaying what values u have to do 
correlate select the value and click Correlate ...

so Auto correlation done u r scripts 

When u want to do Manual Correlation : 
 If u know the values where exactly changing fine other 
wise 

After scripts creation : 

Step 1:  go to run time setting change the Log option 
select Extended log and select 3 check box 

Step3: Run the script " completion of run "

Step 3: Click Ctrl+ F8

Step 4: check the values where exactly changing and what 
value while recording and what value while executing time 
system displaying ..

Step5: Take Replay value and go to Replay Log and find out …

Step 6: Take the complete line values exactly where it’s 
and  paste on notepad 

             ( Make Sure u should know what transaction 
this value in your scripts …when u click the value in 
replay log in script Tree view system shows the transaction 
name …

Step7: go to that Transaction above and right click mouse 
Insert-- New Step-- Service- Find Web_reg_save_param and 
click OK 

Step 8: Enter the Param name  ( make sure what name u given 
here u should replace the value place in your script)  
enter the LR and RB and select Search depending on Body or …

Step 9: Click OK 

Step 10 : Change ( Replace ) the Param name 

Step 11: Save the script and run …

When u want to check the results either u r scripts capture 
the dynamic value or not after completion execution go to 
replay log find with Param name …if u r did correct manual 
correlation system displaying new dynamic values beside of 
u r param name …

Co-relation is the process of capturing dynamic values
returned from server using Web-Reg-Save-Parm function..