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Description

This error, ERR_SQLSCRIPT_CURSOR_ALREADY_OPEN, indicates that an attempt was made to open a SQLScript cursor that is already in an open state. It typically occurs within SAP HANA stored procedures or functions when the cursor handling logic is flawed, leading to a second OPEN statement for an already active cursor.

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Error Message

ERR_SQLSCRIPT_CURSOR_ALREADY_OPEN

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Known Causes

3 known causes

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Incorrect Control Flow

An OPEN statement for a cursor is executed multiple times within a procedure without a corresponding CLOSE statement or proper conditional logic to check the cursor's status.

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Missing CLOSE Statement

A cursor is opened but never explicitly closed, leading to it remaining open. Subsequent attempts to open it within the same session or procedure execution will then trigger this error.

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Flawed Nested Cursor Logic

In complex scenarios involving nested cursors or loops, a cursor might be inadvertently reopened in an inner block when it's still active from an outer block.

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Solutions

3 solutions available

1. Review and Refactor Stored Procedures/Functions advanced

Identify and correct logic within SAP S/4HANA stored procedures or functions that attempt to open a cursor already in use.

1

Identify the specific stored procedure or function causing the error. This usually requires analyzing the application logs or debugging the problematic transaction/process.

2

Examine the code within the identified procedure/function for any explicit cursor declarations (`DECLARE CURSOR FOR`) or implicit cursor usage (e.g., `FOR ... DO`, `LOOP AT ...`).

DECLARE MY_CURSOR CURSOR FOR SELECT ...;
OPEN MY_CURSOR;

3

Ensure that each cursor is properly declared and opened only once within its scope. If a cursor needs to be reused, consider closing it before reopening or using a different cursor variable.

IF CURSOR_IS_OPEN(MY_CURSOR) THEN
  CLOSE MY_CURSOR;
END IF;
OPEN MY_CURSOR FOR ...;

4

If the procedure/function is part of a complex loop or recursive call, ensure that cursor management is handled correctly at each level to avoid state leakage.

5

Test the modified procedure/function thoroughly in a development or test environment before deploying to production.

2. Analyze Application Logic for Concurrent Cursor Access medium

Investigate the application code that interacts with the database to prevent multiple concurrent operations from trying to use the same cursor.

1

Determine which application component or transaction is triggering the error. This might involve tracing the execution path.

2

Review the application code (e.g., ABAP) that calls the stored procedure or directly interacts with database cursors. Look for patterns where the same cursor variable might be accessed by different threads or parallel processes without proper synchronization.

DATA lr_cursor TYPE REF TO some_cursor_type.
CALL METHOD lr_cursor->open(...).
" ... some processing ...
CALL METHOD lr_cursor->open(...). " Potential issue here

3

Implement synchronization mechanisms (e.g., locks, semaphores) in the application logic to ensure that only one process or thread can access a specific cursor at a time.

IF sy-subrc = 0.
  " Lock mechanism to prevent concurrent access
  CALL FUNCTION 'ENQUEUE_EM_SOME_RESOURCE'.
  CALL METHOD lr_cursor->open(...).
  " ... some processing ...
  CALL METHOD lr_cursor->close( ).
  " Unlock mechanism
  CALL FUNCTION 'DEQUEUE_EM_SOME_RESOURCE'.
ENDIF.

4

Consider redesigning the application logic to use alternative database access methods that are less prone to cursor management issues, such as fetching all data into an internal table at once if the dataset is manageable.

5

Perform thorough testing of the application changes in a realistic test environment.

3. Restart SAP Application Server Instance easy

A quick fix to clear transient states and resolve potential memory leaks or corrupted cursor handles.

1

Identify the relevant SAP application server instance(s) that are experiencing the error.

2

Gracefully shut down the identified SAP application server instance(s). This is typically done using the SAP Management Console (SMC) or command-line tools like `stopsap`.

stopsap <SID>

3

Wait for the instance(s) to completely shut down.

4

Start the SAP application server instance(s) again. This is typically done using the SAP Management Console (SMC) or command-line tools like `startsap`.

startsap <SID>

5

Monitor the system and test the functionality that was previously failing to see if the error is resolved.

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Related Errors

5 related errors

SAP S/4HANA Error 1304: SQLScript Cursor Already Open