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The following list displays the set of useful T-Codes for SAP System Administrator. These are T-Codes used by Basis Team on regular day-to-day basis.
(Any additional T-Codes are welcome 
Assigning a T-Code to an ABAP Query can be done in two ways. By first method, you assign Query Program Name to the T-Code. In second, you assign the Query directly to the T-Code.
It is recommended not to assign Query program name directly to trnasaction code in case of queries(prefer method 2 than method 1), because Queries are generated and may vary system by system. But I have seen first being used more.
Write this simple code.
REPORT ZFIELDCONV.
data: d_auart LIKE vbak-auart.
d_auart = ‘TA’.
WRITE d_auart.
What the result output on screen do you expect, “TA”? No, the result will be “OR”.
Now you can create an ALV Grid very fast; you don’t need to define a layout, a fieldcatalog, a container and all the other small things we usually define in an ALV Grid. If we don’t need to finetune the ALV Grid and just want to display a list on the screen or to the printer, here is a very simple way to proceed.
This process is very easy but a lot of programmers don’t know how to do it. You just have to call the ABAP Function Module ‘ SAPGUI_PROGRESS_INDICATOR ‘ , at the appropriate points.
