Återställa databasändringar med implicita räddningspunkter? - Oracle

Här är SAVEPOINT-utdraget från den...

SAVEPOINT

Specify a point in a transaction to which later you can roll back.

Example

insert into emp (empno,ename,sal) values (109,’Sami’,3000);
savepoint a;
insert into dept values (10,’Sales’,’Hyd’);
savepoint b;
insert into salgrade values (‘III’,9000,12000);

Now if you give

rollback to a;

Then  row from salgrade table and dept will be roll backed. Now you can commit the row inserted into emp table or rollback the transaction.

If you give

rollback to b;

Then row inserted into salgrade table will be roll backed. Now you can commit the row inserted into dept table and emp table or rollback to savepoint a or completely roll backed the transaction.

If you give

rollback;

Then the whole transactions is roll backed.

If you give

commit;

Then the whole transaction is committed and all savepoints are removed.