How many of the transactions woill be Roll backed?

Question

Hi friends,
Could you please clarify That How many of the transactions will be rollbacked when we say ROLLBACK....?
(For e.g., As a first transaction i used delete command to delete one row from a table of 10 rows....As a second transaction i used update command two times to update two records in the same table....Now i created one table ...after that i said rollback....So how many of the transactions will be rollbacked?)

Answer 1

I'm sure blushadow has heard of all of those, but what does it have to do with the original question?
SQL> CREATE TABLE t AS
  2  SELECT rownum id, TO_CHAR(TO_DATE(rownum, 'J'), 'Jsp') descr
  3  FROM all_objects WHERE rownum < 10;
Table created.
SQL> SELECT * FROM t;
        ID DESCR
         1 One
         2 Two
         3 Three
         4 Four
         5 Five
         6 Six
         7 Seven
         8 Eight
         9 Nine
SQL> DELETE FROM t WHERE id = 1;
1 row deleted.
SQL> SAVEPOINT a;
Savepoint created.
SQL> UPDATE t SET descr = 'Deux'
  2  WHERE id = 2;
1 row updated.
SQL> SAVEPOINT b;
Savepoint created.
SQL> UPDATE t SET descr = 'Trois'
  2  WHERE id = 3;
1 row updated.
SQL> SELECT * FROM t;
        ID DESCR
         2 Deux
         3 Trois
         4 Four
         5 Five
         6 Six
         7 Seven
         8 Eight
         9 NineI agree that at this point, I can rollback to any point in these three statements, however, as soon as I do:
SQL> CREATE TABLE t1 (id NUMBER);
Table created.then the savepoints are gone
SQL> ROLLBACK TO b;
ROLLBACK TO b
ERROR at line 1:
ORA-01086: savepoint 'B' never establishedNow, the documentation says "If you use a SET TRANSACTION statement, then it must be the first statement in your transaction.", and the very first DELETE starts a transaction. and the fact that:
SQL> SET TRANSACTION AUTONOMOUS;
SET TRANSACTION AUTONOMOUS
ERROR at line 1:
ORA-00900: invalid SQL statementis invalid, even if you could use SET TRANSACTION within an already started transaction. I suppose you could do:
SQL> DROP TABLE t1;
Table dropped.
SQL> TRUNCATE TABLE t;
Table truncated.
SQL> INSERT INTO T
  2  SELECT rownum id, TO_CHAR(TO_DATE(rownum, 'J'), 'Jsp') descr
  3  FROM all_objects WHERE rownum < 10;
9 rows created.
SQL> COMMIT;
Commit complete.
SQL> DELETE FROM t WHERE id = 1;
1 row deleted.
SQL> SAVEPOINT a;
Savepoint created.
SQL> UPDATE t SET descr = 'Deux'
  2  WHERE id = 2;
1 row updated.
SQL> SAVEPOINT b;
Savepoint created.
SQL> UPDATE t SET descr = 'Trois'
  2  WHERE id = 3;
1 row updated.
SQL> DECLARE
  2  PRAGMA AUTONOMOUS_TRANSACTION;
  3  BEGIN
  4     EXECUTE IMMEDIATE 'CREATE TABLE t1 (id NUMBER)';
  5  END;
  6  /
PL/SQL procedure successfully completed.
SQL> ROLLBACK to b;
Rollback complete.but it seems like a lot of effort to get around something that you shouldn't be doing in the first place.
John