How To Fix 00646 - No free block found, session terminated

00646 - Overview

• Message type: E = Error

• Message class: 00 -

• Message number: 646

• Message text: No free block found, session terminated

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message 00646 - No free block found, session terminated ?

  The SAP error message "00646 No free block found, session terminated" typically indicates that the SAP system has run out of memory or resources to allocate for a new session or process. This can occur in various scenarios, such as when the system is under heavy load, when there are memory leaks, or when the configuration settings for memory allocation are not optimized.
  Causes:
  
  Memory Exhaustion: The most common cause is that the SAP instance has exhausted its available memory resources.
  High Load: A sudden spike in user activity or background jobs can lead to resource exhaustion.
  
  Configuration Issues: Incorrect settings in the SAP profile parameters related to memory allocation (e.g., abap/heap_area_total, abap/heap_area_dia, etc.) can lead to insufficient memory.
  Memory Leaks: Poorly written custom code or third-party add-ons can lead to memory leaks, consuming resources over time.
  Database Issues: Problems with the underlying database can also contribute to resource issues.
  
  Solutions:
  
  Check System Load: Monitor the system load