Hi Vishal,

>I need to understand how to set Wait/No Wait Transaction in firebird.
I think you mean in Delphi? Might be better to ask on the Firebird tools group, 
but I have replied below

>Also I have one doubt that I when we start transaction through code as shown 
>below, the transaction locks particular rows in the table or it locks entire 
>table?
I think you will be fine as long as you use generator to get your ID’s if you 
use auto-incremented numeric primary keys.

Delphi code snippet for FIBPlus would be:

sqlMain.Transaction.TPBMode := tpbDefault;
sqlMain.Transaction.TRParams.Clear;
                sqlMain.Transaction.TRParams.Add('read_committed');
sqlMain.Transaction.TRParams.Add('rec_version');
sqlMain.Transaction.TRParams.Params.Add('nowait');
//try
sqlMain.Transaction.StartTransaction;
try

    //Have Insert SQL Execution here

    sqlMain.Transaction.Commit;
except on E: Exception do
  begin
      sqlMain.Transaction.Rollback;
      raise;
  end;
end;

FireDac would  be quite similar.

Cheers
Maya

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