How To Fix AD320 - &: Key length greater than maximum key length (&)

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 320

• Message text: &: Key length greater than maximum key length (&)

What causes this issue?

The key length of a logical pooled table is greater than the maximum
key length of a physical pool.
The definition of a table pool contains at least two key fields and one
long argument field. The first key field contains the name of the pooled
table, the second key field (VARKEY) the primary key field of this
table and the long argument field the non-key fields of the pooled
table. The field VARKEY is of type CHAR(n), where the maximum key
length which is permitted is n <= 110.
The key fields of the logical pooled table which you are editing needs
more space than there is in field VARKEY. Therefore it is not possible
to assign it to a physical pool.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Remove fields from the key.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD320 - &: Key length greater than maximum key length (&) ?

  The SAP error message AD320 indicates that a key length exceeds the maximum allowed key length for a specific database or application context. This error typically arises when you are trying to create or modify a database object (like a table or index) with a key that is longer than the maximum length permitted by the database system.
  Cause:
  
  Key Length Exceeded: The primary cause of this error is that the key you are trying to define (for example, a primary key or unique index) has a length that exceeds the maximum limit set by the database. Different databases have different limits on key lengths.
  Data Type Mismatch: Sometimes, the data types used for the key fields may not be compatible with the expected key length.
  Configuration Issues: There may be configuration settings in the SAP system or the underlying database that are not aligned with the key definitions.
  
  Solution:
  
  Check Key Length: Review the definition of the key you are trying to create or modify. Ensure that the total length of the key does not exceed the maximum allowed length for your database. For example, in many databases, the maximum key length is often 255 bytes.
  Modify Key Definition: If the key length exceeds the limit, consider modifying the key definition. This could involve:
  
  Reducing the number of fields included in the key.
  Changing the data types of the fields to shorter types (e.g., using CHAR instead of VARCHAR).
  Using a hash key or surrogate key if applicable.
  
  
  Database Documentation: Refer to the documentation of the specific database you are using (e.g., Oracle, SQL Server, HANA) to understand the maximum key length and any other constraints.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide guidance on best practices for key definitions.
  Testing: After making changes, test the modifications in a development or test environment before applying them to production.
  
  Related Information:
  
  Database Documentation: Each database system has its own documentation regarding key lengths and constraints. Familiarize yourself with these limits.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they have implemented.
  Performance Considerations: Keep in mind that excessively long keys can also impact performance, so it's best to keep keys as short as necessary while still ensuring uniqueness.
  
  By following these steps, you should be able to resolve the AD320 error and successfully define your keys within the constraints of your database system.