This question is common and it depends of several factors. One of them is the performance of the systems you’re operating on. If they are poor performing with other programs, reports, etc., most likely they will perform even worse. Anyway, there are a few ABAP recommendations you can bear in mind:

1. Use a SELECT SINGLE with joins instead of several SELECT instructions;
2. Use SELECT INTO TABLE instead of SELECT …. ENDSELECT;
3. Try to pass on all the primary keys to the WHERE;
4. If you’re manipulating fields other than the primary keys within the WHERE clause, try to create a secondary index with the same fields in the table;
5. Try to remove inner loops – use READ TABLE instead;
6. If you cannot avoid inner loops, use the WHERE clause inside the inner loop using fields in the 1st loop itab n 2nd loop itab
7. When using READ TABLE, use INDEX or WHERE condition with keys;
8. When updating a table with multiple entries, try to update all entries at once;
9. Try to remove any CALL FUNCTION inside loop – call them before the loop and collect the inputs to a table.

I hope these tips help you.
Regards.
Antonio Caldas

Sorry for the late reply, I have been very busy lately and only now I’m able to reply.
I think that first of all, you need to exercise and define what HR area you’re expert in, or at least interested in like, for example, Time Management, Travel Management, Recruitment, Payroll, just to name a few. Normally companies will be looking for a wider set of knowledge, like experts in PA (Personnel Administration), PD (Personnel Development) or OM (Organizational Management). Again, these are just examples.

In terms of training, my first thought is that you should try SAP directly; even better if you can afford a full round of courses or trying to obtain a certification. This will make your CV glow a lot. There are other companies providing courses. I recommend that you visit Jon Reed’s blog in http://www.jonerp.com/, which focuses in “Career answers for SAP Professionals”.

Definitely, moving your career path to SAP is a very big and important step. I also recommend that you read the following posts:

Are you SAP Hot Skilled?
Webcast – Best Practices in Building Your SAP Consulting Business
2010 SAP Salary Survey
5 Keypoints if you want to be a SAP Consultant
15 SAP Frequently Asked Questions
SAP Application Areas

These articles are a good starting point and that can help you gain some initial knowledge over the great and broad SAP world.
Thanks a lot and keep visiting the SAPLAB blog!

Regards
Antonio Caldas

Sir,I have heard lot about SAP.I want to make a Carrer in SAP field.
But I have no clue/idea– What is SAP ?
Which field of SAP is good for my carrer ??
I am totally blank regarding SAP.

Will you please guide me in this regard.
PLZ mail me information ASAP

warm regards
Rucha
India

Many thanks for your comments.
Please visit regularly!

Um abraço
António Caldas