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Description

The ORA-29251 error occurs during calls to `dbms_sql.bind_array` when the starting index (`index1`) is greater than the ending index (`index2`). This results in an invalid range for binding array elements.

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Error Message

ORA-29251: Index1 is greater than Index2 in call to dbms_sql.bind_array

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Known Causes

3 known causes

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Incorrect Index Order

The `index1` parameter was mistakenly assigned a larger value than the `index2` parameter, leading to an invalid range.

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Logic Error in Index Calculation

A calculation error within the application code resulted in incorrect values being passed as `index1` and `index2`.

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Off-by-One Error

An off-by-one error when determining the correct starting or ending index for the array binding.

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Solutions

3 solutions available

1. Verify Array Binding Indices easy

Ensure the start and end indices for array binding are correctly specified and within the bounds of the array.

1

Examine the PL/SQL code that calls `dbms_sql.bind_array`. Pay close attention to the parameters that define the starting and ending indices for the array being bound.

DECLARE
  l_cursor INTEGER;
  l_array  NUMBER_ARRAY;
  l_idx    INTEGER;
BEGIN
  l_cursor := dbms_sql.open_cursor;
  dbms_sql.parse(l_cursor, 'SELECT :1 FROM dual', dbms_sql.native);

  -- Correctly define the array and its bounds
  l_array := NUMBER_ARRAY(10, 20, 30, 40, 50);
  l_idx := l_array.FIRST;

  -- The ORA-29251 error often occurs when l_idx > l_array.LAST or when the indices are illogical.
  -- Ensure l_idx is less than or equal to l_array.LAST, and that the count is correct.
  dbms_sql.bind_array(l_cursor, ':1', l_array, l_idx, l_array.LAST);

  -- ... rest of your dbms_sql operations ...
  dbms_sql.close_cursor(l_cursor);
END;

2

If you are using `FIRST` and `LAST` collection methods, ensure they are returning valid and sequential indices for the array. Sometimes, sparse arrays or improperly initialized collections can lead to this error.

IF l_array IS NOT NULL AND l_array.COUNT > 0 THEN
  l_idx := l_array.FIRST;
  dbms_sql.bind_array(l_cursor, ':1', l_array, l_idx, l_array.LAST);
ELSE
  -- Handle empty or null array case appropriately
  -- For example, you might bind a null value or skip the bind operation.
  dbms_sql.bind_variable(l_cursor, ':1', NULL);
END IF;

2. Check Collection Initialization and Population medium

Confirm that the collection used for array binding is properly initialized and populated with data before calling `dbms_sql.bind_array`.

1

Verify that the collection variable (e.g., a PL/SQL collection type) is declared and initialized using `( )` or `:= collection_type()` if it's an object type.

TYPE number_array_t IS TABLE OF NUMBER;
my_numbers number_array_t := number_array_t(); -- Correct initialization

2

Ensure that elements are actually added to the collection before attempting to bind. If the collection is empty, `FIRST` and `LAST` might return `NULL` or unexpected values, leading to an index out-of-range error.

my_numbers.EXTEND(5);
FOR i IN 1..5 LOOP
  my_numbers(i) := i * 10;
END LOOP;

-- Now bind the populated collection
dbms_sql.bind_array(l_cursor, ':array_param', my_numbers, my_numbers.FIRST, my_numbers.LAST);

3. Simplify and Isolate the Problematic Bind medium

Reduce the complexity of the `dbms_sql` call to pinpoint the exact array binding causing the issue.

1

If you have multiple `dbms_sql.bind_array` calls in a single `dbms_sql` operation, comment out all but one, starting with the one you suspect is problematic. Re-run the code to see if the error persists.

-- Original code with multiple binds:
-- dbms_sql.bind_array(l_cursor, ':array1', arr1, arr1.FIRST, arr1.LAST);
-- dbms_sql.bind_array(l_cursor, ':array2', arr2, arr2.FIRST, arr2.LAST);

-- Test by commenting out one:
-- dbms_sql.bind_array(l_cursor, ':array1', arr1, arr1.FIRST, arr1.LAST);
-- -- dbms_sql.bind_array(l_cursor, ':array2', arr2, arr2.FIRST, arr2.LAST);

2

Once the problematic `bind_array` call is identified, create a minimal reproducible example. This involves a simplified SQL statement and only the necessary collection and bind operations. This isolation helps in debugging the specific array and its indices.

DECLARE
  l_cursor INTEGER;
  l_array  NUMBER_ARRAY;
BEGIN
  l_cursor := dbms_sql.open_cursor;
  dbms_sql.parse(l_cursor, 'SELECT :val FROM dual', dbms_sql.native);

  -- Minimal example for the problematic array
  l_array := NUMBER_ARRAY(1, 2, 3);
  dbms_sql.bind_array(l_cursor, ':val', l_array, l_array.FIRST, l_array.LAST);

  -- Execute and fetch for verification
  dbms_sql.execute(l_cursor);
  -- ... fetch logic ...

  dbms_sql.close_cursor(l_cursor);
END;

Oracle ORA-29251: Index Out-of-Range