How to execute stored procedure cursor records parallelly - oracle

Question

I have a stored procedure which does following tasks on 2 tables related to each other as below
CREATE TABLE address (adr_id, ver_id, address) AS
SELECT 1, 1, 'newYork' FROM DUAL UNION ALL
SELECT 1, 2, 'newYork' FROM DUAL UNION ALL
SELECT 1, 3, 'newYork' FROM DUAL UNION ALL
SELECT 4, 1, 'Washington' FROM DUAL UNION ALL
SELECT 4, 2, 'Washington' FROM DUAL;
CREATE TABLE employee (emp_id,adr_id,ver_id,) AS
SELECT 100,1, 1 FROM DUAL UNION ALL
SELECT 200,1, 2 FROM DUAL UNION ALL
SELECT 300,1, 3 FROM DUAL UNION ALL
SELECT 400,4, 1 FROM DUAL UNION ALL
SELECT 500,4, 2 FROM DUAL;
Here Following tasks are done in stored procedure and required to be executed in parallel as to increase throughput on billions of records in both table
Note: Foreign key Constraints are relaxed
Find records with distinct address "newYork" and have them in cursor
Loop on Cursor record as follows
and process each address record select * from address where address ="newYork"
Insert a new record in Address table with same address as first record (with ver_id=0) in #3 and take the newly inserted id
Find parent table records based on foreign key in Employee table and update them with newly id mentioned in #4.
delete all records of #3
Since Step 2 to 6 can be executed in parallel just wanted to know how this can be achieved ?
Expected After
Address
adr_id
ver_id
address
11
0
newYork
12
0
Washington
Employee
id
adr_id
ver_id
100
11
1
200
11
2
300
11
3
400
12
1
500
12
2

Answer 1

As a frame challenge, do not update the adr_id and just change the version; that way you do not need to change the referential constraints.
MERGE INTO address dst
USING (
SELECT ROWID AS rid,
COUNT(*) OVER (PARTITION BY adr_id) AS cnt,
ROW_NUMBER() OVER (PARTITION BY adr_id ORDER BY ver_id) AS rn
FROM address
) src
ON (dst.ROWID = src.rid AND src.cnt > 1)
WHEN MATCHED THEN
UPDATE
SET ver_id = 0
DELETE WHERE src.rn > 1
fiddle