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Description

Error 324, 'ERR_SQL_EXST_SEQ', indicates an attempt to create a SQL sequence with a name that already exists within the current database schema. This typically occurs during database object creation, data migration, or when executing scripts that define new sequences without proper checks for existing ones.

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Error Message

ERR_SQL_EXST_SEQ

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Known Causes

4 known causes

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Accidental Duplicate Object Creation

A user or automated process attempted to create a SQL sequence using a name already present in the database, often due to oversight or incorrect command execution.

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Improper Deployment Script Execution

Database deployment scripts or migration routines were run without proper checks for existing sequence names, leading to a conflict when attempting to redefine an object.

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Data Migration Name Conflict

During data migration or system upgrades, a sequence name intended for creation already exists in the target environment, causing a conflict.

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Manual Database Manipulation Error

A database administrator or developer manually executed a CREATE SEQUENCE command without verifying the uniqueness of the sequence name within the schema.

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Solutions

3 solutions available

1. Identify and Rename Conflicting SQL Sequence medium

Locate the duplicate SQL sequence name in the SAP HANA database and rename one of them.

1

Connect to the SAP HANA database using a SQL client (e.g., SAP HANA Studio, hdbsql).

2

Execute a query to find all sequences and their schemas. Look for any sequences with identical names.

SELECT SEQUENCE_SCHEMA, SEQUENCE_NAME FROM SEQUENCES WHERE SEQUENCE_NAME = '<duplicate_sequence_name>';

3

Once the duplicate is identified, determine which sequence is the correct one to keep. This might involve checking application logs, development documentation, or consulting with the development team.

4

Rename the duplicate sequence. It's a good practice to add a suffix like '_old' or '_backup' to clearly indicate it's a superseded object. **Caution:** Ensure no active processes are using the sequence you intend to rename.

RENAME SEQUENCE "<schema_name>"."<duplicate_sequence_name>" TO "<schema_name>"."<duplicate_sequence_name>_old";

5

Verify that the sequence has been renamed successfully.

SELECT SEQUENCE_SCHEMA, SEQUENCE_NAME FROM SEQUENCES WHERE SEQUENCE_NAME LIKE '%_old%';

6

Restart the relevant SAP S/4HANA application or service that was encountering the error.

2. Review and Correct Development Objects advanced

Investigate the application or custom development code that is creating the duplicate sequence.

1

Identify the SAP S/4HANA component or custom development project that is associated with the error. This might involve checking recent transport imports, development logs, or application error messages.

2

Examine the Data Dictionary (SE11 in ABAP) or any SQL scripts that are responsible for creating or managing sequences within the affected schema.

3

Look for instances where a sequence with the same name is being defined multiple times, either directly or indirectly through generated code or libraries.

4

Modify the development code or Data Dictionary objects to ensure that each sequence name is unique within its schema. This might involve renaming the sequence in the code or removing redundant definitions.

5

Re-transport the corrected development objects into the SAP S/4HANA system.

6

Perform a full system restart or restart of the affected application services after the transport.

3. Recreate Sequence After Backup medium

Safely drop and recreate the duplicate sequence after backing up its current state.

1

Connect to the SAP HANA database using a SQL client.

2

Query the sequence definition to capture its current state (e.g., starting value, increment, min/max values).

SELECT SEQUENCE_START_VALUE, SEQUENCE_INCREMENT_BY, SEQUENCE_MIN_VALUE, SEQUENCE_MAX_VALUE, SEQUENCE_CYCLE_FLAG FROM SEQUENCES WHERE SEQUENCE_SCHEMA = '<schema_name>' AND SEQUENCE_NAME = '<duplicate_sequence_name>';

3

Drop the duplicate sequence. **Caution:** Ensure no critical processes are actively using this sequence. If unsure, use the renaming method first.

DROP SEQUENCE "<schema_name>"."<duplicate_sequence_name>";

4

Recreate the sequence with the same definition, but ensure it is assigned a unique name or that the original intended sequence is now the only one with that name.

CREATE SEQUENCE "<schema_name>"."<new_or_corrected_sequence_name>" START WITH <start_value> INCREMENT BY <increment_value> MINVALUE <min_value> MAXVALUE <max_value> CYCLE <cycle_flag>;

5

Update any application code or configurations that might be referencing the old sequence name to point to the new or corrected name.

6

Restart the affected SAP S/4HANA application or service.

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Related Errors

5 related errors

SAP S/4HANA Error 324: Duplicate SQL Sequence Name