How To Fix DT978 - Table &: Key too wide for DB & (width: &, maximum width: &)

DT978 - Overview

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 978

• Message text: Table &: Key too wide for DB & (width: &, maximum width: &)

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DT978 - Table &: Key too wide for DB & (width: &, maximum width: &) ?

  The SAP error message DT978 indicates that a key in a database table is too wide for the database system to handle. This typically occurs when the combined length of the fields that make up the primary key exceeds the maximum allowed width for keys in the database.
  
  Cause:
  
  Key Length Exceeds Limit: The primary key of the table is defined with a total length that exceeds the maximum allowed length for keys in the underlying database. Different databases have different limits on the maximum size of a key.
  Data Type Issues: The data types used in the key may have larger sizes than expected, especially if you are using character types (e.g., CHAR, VARCHAR) with large lengths.
  Table Design: The design of the table may not be optimal, leading to unnecessarily wide keys.
  
  
  Solution:
  
  Review Key Definition: Check the definition of the primary key in the table. You may need to reduce the number of