Executing a query within forall - oracle

Question

I have a set of queries that is present Queries.
Now i want to execute this by using forall in the way shown below:
open EX01_CURSOR;
LOOP
FETCH EX01_CURSOR BULK COLLECT INTO Queries LIMIT 50000;
EXIT WHEN Queries.COUNT = 0;
FORALL i IN 1 .. Queries.count
**execute immediate Queries(i).update_query;**
commit;
END LOOP;
close EX01_CURSOR;
I want to execute my query within the forall block.
I'm getting compilation errors as shown below:
DML statement without BULK In-BIND cannot be used inside FORALL
can somebody please help?

Answer 1

FORALL isn't really a LOOP or iterator, but is a BULK DML operation. It doesn't run an operation for each entry in the collection, entry-by-entry, but runs one DML operation for all the entries in the collection. You can't run Dynamic SQL in BULK and can't iterate. To iterate and run the EXECUTE IMMEDIATE, you will need use a LOOP (or to take another approach).
Here's an example. It still uses BULK COLLECT to control commit size, but does the Dynamic SQL in a FOR LOOP. (Note: not efficient to do this volume of Dynamic SQL. Just an example keeping your original collection size)
Set up test data:
CREATE TABLE TEST_TABLE (
TEST_ID NUMBER
);
INSERT INTO TEST_TABLE SELECT LEVEL
FROM DUAL
CONNECT BY LEVEL <= 50001;
Initial Data:
SELECT * FROM TEST_TABLE ORDER BY 1 DESC FETCH FIRST 5 ROWS ONLY;
TEST_ID
50001
50000
49999
49998
49997
Then run the block. This does not use FORALL BULK DML. It uses a FOR LOOP instead:
DECLARE
CURSOR EX01_CURSOR IS (
SELECT 'UPDATE TEST_TABLE SET TEST_TABLE.TEST_ID = TEST_TABLE.TEST_ID + 100000 WHERE TEST_TABLE.TEST_ID = ' ||
TEST_TABLE.TEST_ID AS UPDATE_QUERY
FROM TEST_TABLE);
TYPE EX01_CUR_TYPE IS TABLE OF EX01_CURSOR%ROWTYPE;
QUERIES EX01_CUR_TYPE;
BEGIN
QUERIES := EX01_CUR_TYPE();
OPEN EX01_CURSOR;
LOOP
FETCH EX01_CURSOR BULK COLLECT INTO QUERIES LIMIT 50000;
EXIT WHEN QUERIES.COUNT = 0;
FOR UPDATE_POINTER IN 1..QUERIES.COUNT
LOOP
EXECUTE IMMEDIATE QUERIES(UPDATE_POINTER).UPDATE_QUERY;
END LOOP;
COMMIT;
END LOOP;
CLOSE EX01_CURSOR;
END;
/
PL/SQL procedure successfully completed.
Result:
SELECT * FROM TEST_TABLE ORDER BY 1 DESC FETCH FIRST 5 ROWS ONLY;
TEST_ID
150001
150000
149999
149998
149997