SQL & PL/SQL

Hello,

i am new to oracle. i am writing a stored procedure through which i want to insert 1 billion record in a table. but it takes days to insert it . please tell me how can i improve performance of my stored procedure. because same stored procedure when i convert it into sql server in take 24 - 30 min to insert 1 billion record.

Code of my stored procedure are as follows :



create or replace PROCEDURE bspGenerateHSCode(
mLoc_id IN INT,
HSCodeStart IN VARCHAR2,
HSCodeEnd IN VARCHAR2,
mRqstId IN INT,
total_count IN INT,
Status OUT INT)

AS

ExitFlag INT;
row_count INT;
mBatchStart NUMBER;
mBatchEnd NUMBER;
mStartSqnc NUMBER;
mEndSqnc NUMBER;
mHSCode VARCHAR2(500);
HSStartStr VARCHAR2(500);

BEGIN

SELECT COUNT(*) INTO row_count FROM goap_eal_allocation
WHERE hs_code_start = HSCodeStart
AND hs_code_end = HSCodeEnd
AND loc_id = mLoc_id
AND processed = 0;

IF row_count > 0 THEN


SELECT CAST ( REVERSE(substr(REVERSE(HSCodeStart), 1, instr(REVERSE(HSCodeStart), ',') -1)) AS NUMBER) INTO mStartSqnc FROM DUAL;
SELECT CAST ( REVERSE(substr(REVERSE(HSCodeEnd), 1, instr(REVERSE(HSCodeEnd), ',') -1)) AS NUMBER) INTO mEndSqnc FROM DUAL;
SELECT CAST( REVERSE(substr( REVERSE(HSCodeStart), instr(REVERSE(HSCodeStart), ','))) AS VARCHAR2(500) ) INTO HSStartStr FROM DUAL;


mBatchStart := mStartSqnc;
DBMS_OUTPUT.PUT_LINE('start batch ' || mBatchStart);

LOOP
mBatchEnd := mBatchStart + 5000;
IF mBatchEnd > mEndSqnc THEN
mBatchEnd := mEndSqnc + 1;
END IF;
DBMS_OUTPUT.PUT_LINE('End batch ' || mBatchEnd);
LOOP
mHSCode := HSStartStr || mBatchStart;

mBatchStart := mBatchStart + 1;


INSERT INTO goap_eal_register(id, hs_code, loc_id, status_id, synced)
SELECT CASE WHEN MAX(id) > 0 THEN (MAX(id) + 1) ELSE 1 END AS id ,
mHSCode, mLoc_id, 6, 1 FROM goap_eal_register;

EXIT WHEN mBatchStart = mBatchEnd;
END LOOP;
COMMIT;
EXIT WHEN mBatchStart = mEndSqnc +1;
END LOOP;

UPDATE goap_eal_allocation SET processed = 1
WHERE hs_code_start = HSCodeStart
AND hs_code_end = HSCodeEnd
AND loc_id = mLoc_id;

COMMIT;

Status := 1;
ELSE
Status := 0;
END IF;
END;




Thanks