gs gs117 Transactions - Implementation of Isolation Levels - Quiz No.1
gs gs117 Database Management System Quiz
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UPDATE empdet SET ename = 'Amit' WHERE empno = 1234;DELETE FROM empdet WHERE ename LIKE 'J%';CREATE VIEW empvu AS SELECT * FROM empdept;CREATE INDEX empdet_idx ON empdet(empno);| Name | Null? | Type |
| Cust_id | Not null | Number(2) |
| Cust_Name | Varchar2(15) |
Evaluate the following SQL statements executed in the given order:
ALTER TABLE cust ADD CONSTRAINT cust_id_pk PRIMARY KEY(cust_id) DEFERRABLE INITIALLY DEFERRED; INSERT INTO cust VALUES (1,'RAJ'); --row 1 INSERT INTO cust VALUES (1,'SAM'); --row 2 COMMIT; SET CONSTRAINT cust_id_pk IMMEDIATE; INSERT INTO cust VALUES (1,'LATA'); --row 3 INSERT INTO cust VALUES (2,'KING'); --row 4 COMMIT; Which rows would be made permanent in the CUST table?
DROP TABLE dept; CREATE TABLE dept (deptno NUMBER(3) PRIMARY KEY, deptname VARCHAR2(10)); DROP TABLE dept; FLASHBACK TABLE dept TO BEFORE DROP; Which statement is true regarding the above FLASHBACK operation?
CREATE TABLE digits (id NUMBER(2), description VARCHAR2(15)); INSERT INTO digits VALUES (1,'ONE'); UPDATE digits SET description ='TWO' WHERE id=1; INSERT INTO digits VALUES (2,'TWO'); COMMIT; DELETE FROM digits; SELECT description FROM digits VERSIONS BETWEEN TIMESTAMP MINVALUE AND MAXVALUE;What would be the outcome of the above query?
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