Oracle
1Z0-062 · Question #251
1Z0-062 Question #251: Real Exam Question with Answer & Explanation
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Managing Data and Concurrency
Question
The HR user executes the following query on the EMPLOYEES table but does not issue COMMIT, ROLLBACK, or any data definition language (DDL) command after that: HR then opens a second session. Which two operations wait when executed in HR's second session?
Options
- ALOCK TABLE employees IN EXCLUSIVE MODE;
- BINSERT INTO employees(empno,ename) VALUES (1289, `Dick');
- CSELECT job FROM employees WHERE job='CLERK' FOR UPDATE OF empno;
- DSELECT empno,ename FROM employees WHERE job='CLERK';
- EINSERT INTO employees(empno,ename,job) VALUES (2001,'Harry','CLERK);
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Topics
#transaction locks#row locks#table locks#concurrency