Oracle - System Change Number(SCN) | Flashback Version Query | How to find history in oracle

Опубликовано: 19 Ноябрь 2024
на канале: rejawebs

680

--Flashback Version Query
01. Check current system change number (SCN)
01.01. switch user to sys and check
Select CURRENT_SCN from v$database;

02. Let's copy some record from to a new table
create table employees3
as
SELECT * FROM employees
WHERE employee_id 110;

03. Now update record for salary in employees3
UPDATE employees3 SET salary = salary * 1.99
WHERE employee_id = 107;

04. Our main goal is to check SCN for a specific table
SELECT salary FROM employees3
VERSIONS BETWEEN SCN MINVALUE AND MAXVALUE
WHERE employee_id = 107;

05. Check current system change number (SCN) by executing several time
05.01. switch user to sys and check
Select CURRENT_SCN from v$database;
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