Error
Error Code:
652
SAP S/4HANA Error 652: Schema Ambiguity
Description
This error indicates that the database system cannot uniquely identify a specific schema or database object referenced in an SQL query or application logic within SAP S/4HANA. It typically occurs when there are multiple objects with the same name across different schemas, and the query doesn't specify which one to use, leading to an ambiguous reference.
Error Message
ERR_SQL_AMBG_SCHEMA: Schema ambiguously defined
Known Causes
4 known causesAmbiguous Object Naming
Multiple schemas contain objects (tables, views, stored procedures) with identical names, and a query references the object without explicitly specifying the schema.
Missing Schema Qualification
SQL queries or application code omit the necessary schema prefix for a database object, leading the system to search across available schemas and find multiple matches.
Conflicting Default Schema Settings
The user's default schema or the application's connection settings are not correctly configured, or they conflict with other definitions, causing ambiguity when an unqualified object is accessed.
Inconsistent Database Links or Synonyms
Database links, synonyms, or views are set up in a way that creates multiple paths to objects with the same name across different databases or schemas.
Solutions
3 solutions available1. Explicitly Qualify Database Objects easy
Prepend the schema name to all database objects in your SQL statements.
1
Identify the SQL statements that are causing the 'Schema ambiguously defined' error. This often occurs in custom reports, interfaces, or stored procedures.
2
For each identified SQL statement, prepend the correct schema name to all table, view, and function references. In SAP HANA, the primary schema is typically the SAP system schema (e.g., `SAPABAP1` for ABAP systems).
SELECT * FROM "SAPABAP1"."MY_TABLE" WHERE "COLUMN1" = 'VALUE';3
If you are using synonyms, ensure they are correctly defined and point to the intended schema object. If the synonym itself is causing ambiguity, you might need to qualify the synonym with its schema or remove it and use direct object qualification.
4
Test the modified SQL statements thoroughly to ensure they execute correctly and return the expected results.
2. Review and Correct Search Paths medium
Adjust the SQL search path to prioritize the correct schema.
1
Understand that the SQL search path determines the order in which SAP HANA searches for database objects when a schema is not explicitly specified. Multiple schemas might contain objects with the same name.
2
Access your SAP HANA system's SQL configuration. This is typically done via SAP HANA Studio or SAP HANA Cockpit.
3
Locate and modify the `search_path` parameter. You want to ensure that the schema containing the intended objects (e.g., `SAPABAP1`) is listed before any other schemas that might have objects with conflicting names.
ALTER SYSTEM ALTER CONFIGURATION ('indexserver.ini', 'SYSTEM') SET ('sql', 'search_path') = '"SAPABAP1", "OTHER_SCHEMA"' WITH RECONFIGURE;4
Note: Modifying system-wide configuration parameters requires appropriate administrative privileges and should be done with caution. It's often better to address ambiguity at the statement level if possible, but this can be a global solution.
5
Restart the relevant SAP HANA services or the entire SAP HANA system for the configuration change to take effect.
6
Retest the applications or queries that were previously encountering the error.
3. Analyze and Rename Conflicting Objects advanced
Identify and resolve duplicate object names across schemas.
1
Perform a comprehensive audit of your SAP HANA database schemas to identify objects (tables, views, procedures, functions) that share the same name but reside in different schemas.
SELECT SCHEMA_NAME, OBJECT_NAME, OBJECT_TYPE FROM _SYS_REPO.OBJECTS WHERE OBJECT_NAME IN (SELECT OBJECT_NAME FROM _SYS_REPO.OBJECTS GROUP BY OBJECT_NAME HAVING COUNT(DISTINCT SCHEMA_NAME) > 1);2
For each set of conflicting objects, determine which object is the correct one for the context where the error is occurring. This might involve understanding the application's logic or the data requirements.
3
If a duplicate object is not intended or is an old version, consider dropping it. **Perform a thorough impact analysis before dropping any objects.**
4
If the duplicate object is necessary, but causing ambiguity, consider renaming one of the objects to a more specific and unique name. This might involve renaming the object within its schema.
RENAME "SCHEMA_NAME"."OLD_OBJECT_NAME" TO "NEW_UNIQUE_OBJECT_NAME";5
After renaming, update any applications, reports, or interfaces that reference the renamed object to use the new name. This can be a significant undertaking.
6
Test all affected components to ensure proper functionality.