Top 10 Common ABAP Performance Mistakes (Real Project Examples)

Introduction

ABAP performance issues are one of the most common problems I see in real SAP projects.
Even experienced ABAP developers sometimes write code that works correctly but performs poorly in production systems.

In this article, I will share 10 common ABAP performance mistakes and explain how to avoid them using best practices.
All examples are based on real-life project experience.

1. Using SELECT * Instead of Specific Fields

❌ Problem

SELECT * FROM mara INTO TABLE lt_mara.

This reads all columns, even if you only need a few fields.

✅ Solution

SELECT matnr mtart

  FROM mara

  INTO TABLE lt_mara.

📌 Always select only the fields you really need.

2. SELECT Statements Inside Loops

❌ Problem

LOOP AT lt_vbak INTO ls_vbak.

  SELECT SINGLE * FROM vbap INTO ls_vbap

    WHERE vbeln = ls_vbak-vbeln.

ENDLOOP.

This causes multiple database calls.

✅ Solution

Use JOIN or FOR ALL ENTRIES.

SELECT a~vbeln b~posnr

  FROM vbak AS a

  INNER JOIN vbap AS b

    ON a~vbeln = b~vbeln

  INTO TABLE lt_data.

📌 One DB call is always better than many.

3. Wrong Usage of FOR ALL ENTRIES

❌ Problem

SELECT * FROM vbap

  INTO TABLE lt_vbap

  FOR ALL ENTRIES IN lt_vbak

  WHERE vbeln = lt_vbak-vbeln.

If lt_vbak is empty, this selects all records.

✅ Solution

IF lt_vbak IS NOT INITIAL.

  SELECT vbeln posnr

    FROM vbap

    INTO TABLE lt_vbap

    FOR ALL ENTRIES IN lt_vbak

    WHERE vbeln = lt_vbak-vbeln.

ENDIF.

📌 Always check the internal table before using FAE.

4. Using Standard Tables for Large Data

❌ Problem

DATA: lt_data TYPE STANDARD TABLE OF mara.

Standard tables are slow for READ operations.

✅ Solution

DATA: lt_data TYPE SORTED TABLE OF mara

      WITH UNIQUE KEY matnr.

📌 Use:

• STANDARD → sequential access
• SORTED / HASHED → fast key access

5. Missing Proper Indexes in WHERE Conditions

❌ Problem

SELECT * FROM ztable

  WHERE field1 = lv_val1

    AND field2 = lv_val2.

If no index exists, DB scan happens.

✅ Solution

• Check SE11
• Create a secondary index
• Match index field order with WHERE clause

📌 Indexes are critical for large Z-tables.

---

6. Reading Internal Tables Without Binary Search

❌ Problem

READ TABLE lt_data INTO ls_data

  WITH KEY matnr = lv_matnr.

This causes a linear search.

✅ Solution

SORT lt_data BY matnr.

READ TABLE lt_data INTO ls_data

  WITH KEY matnr = lv_matnr

  BINARY SEARCH.

📌 Or use SORTED / HASHED tables.

7. Not Using SELECT SINGLE Correctly

❌ Problem

SELECT * FROM t001

  INTO ls_t001

  WHERE bukrs = lv_bukrs.

✅ Solution

SELECT SINGLE * FROM t001

  INTO ls_t001

  WHERE bukrs = lv_bukrs.

📌 SELECT SINGLE is faster and clearer for single records.

---

8. Processing Data on Application Server Instead of Database

❌ Problem

SELECT * FROM vbak INTO TABLE lt_vbak.

DELETE lt_vbak WHERE erdat < lv_date.

✅ Solution

SELECT * FROM vbak

  INTO TABLE lt_vbak

  WHERE erdat >= lv_date.

📌 Let the database do the filtering.

---

9. Ignoring Code Inspector and ATC Results

Many performance issues are already detected by:

• SCI (Code Inspector)
• ATC (ABAP Test Cockpit)

📌 Always fix:

• SELECT in loops
• Unused fields
• Large internal tables

---

10. Not Measuring Performance (ST05 / SAT)

❌ Problem

Guessing where the problem is.

✅ Solution

Use:

• ST05 → SQL Trace
• SAT / SE30 → Runtime Analysis

📌 Measure first, optimize later.

---

All examples in this article are based on real production systems where performance issues caused serious runtime and user experience problems.

Conclusion

ABAP performance optimization is not about writing complex code.
It is about writing smart, clean, and database-friendly code.

If you avoid these common mistakes, your ABAP programs will be:

• Faster
• More stable
• Easier to maintain

You can also read my article on Modern Abap Code .

About the Author

Murat Alev is a Senior SAP ABAP Consultant with hands-on experience in ABAP development, performance optimization, and SAP integrations. He focuses on SAP projects in the UK and European market.