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NEW QUESTION: 1
Which statements are true regarding the FOR UPDATE clause in a SELECT statement? (Choose all that apply.)
A. It locks only the columns specified in the SELECT list.
B. It can be used in SELECT statements that are based on a single or multiple tables.
C. It can be used only in SELECT statements that are based on a single table.
D. After it is enforced by a SELECT statement, no other query can access the same rows until a COMMIT or ROLLBACK is issued.
E. It locks the rows that satisfy the condition in the SELECT statement.
Answer: B,E
Explanation:
Explanation/Reference:
Explanation:
FOR UPDATE Clause in a SELECT Statement
Locks the rows in the EMPLOYEES table where job_id is SA_REP.
Lock is released only when you issue a ROLLBACK or a COMMIT.
If the SELECT statement attempts to lock a row that is locked by another user, the database waits until the row is available, and then returns the results of the SELECT statement.
FOR UPDATE Clause in a SELECT Statement
When you issue a SELECT statement against the database to query some records, no locks are placed on the selected rows. In general, this is required because the number of records locked at any given time is (by default) kept to the absolute minimum: only those records that have been changed but not yet committed are locked. Even then, others will be able to read those records as they appeared before the change (the "before image" of the data). There are times, however, when you may want to lock a set of records even before you change them in your program.
Oracle offers the FOR UPDATE clause of the SELECT statement to perform this locking. When you issue a SELECT...FOR UPDATE statement, the relational database management system (RDBMS) automatically obtains exclusive row-level locks on all the rows identified by the SELECT statement, thereby holding the records "for your changes only." No one else will be able to change any of these records until you perform a ROLLBACK or a COMMIT.
You can append the optional keyword NOWAIT to the FOR UPDATE clause to tell the Oracle server not to wait if the table has been locked by another user. In this case, control will be returned immediately to your program or to your SQL Developer environment so that you can perform other work, or simply wait for a period of time before trying again. Without the NOWAIT clause, your process will block until the table is available, when the locks are released by the other user through the issue of a COMMIT or a ROLLBACK command.

NEW QUESTION: 2
What is the process of carrying out a private, point-to-point connection in an existing public network?
A. Spoofing
B. Tunneling
C. Burrowing
D. TCP synch
Answer: A

NEW QUESTION: 3
On which OWD sharing defaults the Sharing Rules can't be defined?
A. OWD is Public Read Write
B. Sharing rules can be created on any of the above
C. OWD is Public Read Only
D. OWD is Private
Answer: A

NEW QUESTION: 4
Which of the following is the GREATEST advantage of elliptic curve encryption over RSA encryption?
A. Simpler key distribution
B. Ability to support digital signatures
C. Computation speed
D. Greater strength for a given key length
Answer: C
Explanation:
Explanation/Reference:
Explanation:
The main advantage of elliptic curve encryption over RSA encryption is its computation speed. This method was first independently suggested by Neal Koblitz and Victor S.
Miller. Both encryption methods support digital signatures and are used for public key encryption and distribution. However, a stronger key per se does not necessarily guarantee better performance, but rather the actual algorithm employed.