How To Fix AD605 - Key length greater than maximum key length &

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 605

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

What causes this issue?

The specified key length of the pool is too large. You probably
specified further key fields in addition to the mandatory key fields of
the pool or changed the standard setting for the length of the
VARKEY field of the pool.
A pool has exactly two key fields. The first key field contains
the table names of the pooled table, the second key field (VARKEY) the
primary key fields of this table.

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

System Response

How to fix this error?

Change the definition of the pool to correspond.
A pool must contain two key fields TABNAME (CHAR 10) and VARKEY
(CHAR 110).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD605 - Key length greater than maximum key length & ?

  The SAP error message AD605 ("Key length greater than maximum key length") typically occurs when there is an attempt to create or manipulate a key in a database table or an index that exceeds the maximum allowable length defined by the database system. This can happen in various scenarios, such as when defining primary keys, unique keys, or indexes in SAP.
  Causes:
  
  Exceeding Key Length Limits: The key being defined or used exceeds the maximum length allowed by the database. Different databases have different limits on key lengths.
  Data Type Mismatch: Using a data type for a key that has a larger length than what is supported.
  Concatenated Keys: If a key is formed by concatenating multiple fields, the total length of the concatenated fields may exceed the limit.
  Changes in Table Structure: Modifications to the table structure that inadvertently increase the key length.
  
  Solutions:
  
  Review Key Definitions: Check the definition of the key in the database table or index. Ensure that the total length of the key does not exceed the maximum allowed length.
  Modify Data Types: If possible, change the data types of the fields that make up the key to shorter types or reduce the number of fields used in the key.
  Split Keys: If a concatenated key is too long, consider splitting it into multiple keys or using a different approach to indexing.
  Database-Specific Limits: Refer to the documentation of the specific database you are using (e.g., Oracle, SQL Server, HANA) to understand the maximum key length and adjust your key definitions accordingly.
  Check for Updates: Ensure that your SAP system and database are up to date, as there may be patches or updates that address this issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to this error message.
  Database Documentation: Review the documentation for the specific database you are using to understand its limitations regarding key lengths.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to review and modify table definitions.
  Testing: After making changes, test the functionality to ensure that the error does not recur and that the application behaves as expected.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.