In SAP ABAP BDC, if you need to upload and process around 10000 records from a file, which method is generally more suitable and reliable?

Introduction / Context:
When loading large data volumes into SAP via Batch Data Communication (BDC), you must choose between the session method and the CALL TRANSACTION method. Processing around 10000 records is a typical real world batch load scenario. This question asks which BDC method is more suitable and reliable for such a high volume, focusing on robustness, logging, and restart capability.

Given Data / Assumptions:

• There are about 10000 records in an input file.
• Data needs to be loaded into a standard SAP transaction in bulk.
• We want a method that is reliable, restartable, and provides standard logs.

Concept / Approach:
The BDC session method is designed for classic batch input scenarios and is well suited for large data volumes. It creates a batch input session that can be processed later in the background using transaction SM35. Standard logs are generated, making it easy to analyze errors. CALL TRANSACTION, in contrast, processes records immediately and requires custom code for logging and error handling, which can be less robust for very large data loads if not carefully implemented.

Step-by-Step Solution:
Step 1: Recognize that 10000 records represent a high volume where robustness and logging are important. Step 2: In the session method, the program reads the file, populates BDC data, and writes it to a batch input session. Step 3: Using transaction SM35, you can run the session in the background, monitor progress, and review standard error logs. Step 4: If errors occur, you can correct data and restart or reprocess the session without modifying the program. Step 5: For CALL TRANSACTION, you would need to handle each of these aspects manually, which is more complex for very large volumes.

Verification / Alternative check:
SAP training material typically recommends the session method for large, periodic data loads where transparency and error tracking are critical. Many real world projects use the session method for initial data migration or mass updates because SM35 provides a user friendly interface to review failed records. This aligns with choosing the session method when the record count is as high as 10000.

Why Other Options Are Wrong:
Option B is incorrect because using CALL TRANSACTION with no logs and no message handling is risky and makes troubleshooting difficult, especially with 10000 records. Option C is impractical because manually entering 10000 records is time consuming and error prone, defeating the purpose of BDC automation. Option D is incorrect because debugging tools are meant for development and problem solving, not for regular data loads.

Common Pitfalls:
A common mistake is choosing CALL TRANSACTION for all scenarios simply because it is easier to code for small volumes, without considering logging and restart needs for bigger loads. Another pitfall is ignoring SM35, which is specifically designed to manage batch input sessions. For large data volumes, the session method offers better transparency, standard logs, and the ability to restart failed sessions, which makes it the safer choice.

Final Answer:
For processing about 10000 records in BDC, it is generally better to use the BDC session method to create a batch input session and process it via transaction SM35.