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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. After it is enforced by a SELECT statement, no other query can access the same rows until a COMMIT or ROLLBACK is issued.
B. It locks only the columns specified in the SELECT list.
C. It can be used in SELECT statements that are based on a single or multiple tables.
D. It locks the rows that satisfy the condition in the SELECT statement.
E. It can be used only in SELECT statements that are based on a single table.
Answer: C,D
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
Users would export DQ mappings to PowerCenter for which of the following reasons? (Choose 4 answers)
A. DQ as part of ETL process
B. Scalability
C. Batch access
D. Performance
Answer: A,B,C,D
Explanation:
Explanation
NOTE: Absurd Question. All options are right?????

NEW QUESTION: 3








Answer:
Explanation:

NEW QUESTION: 4
From Power BI Desktop, you publish an app that contains one dashboard and one report. Q&A is enabled on the dashboard.
In Q&A, a user types the query count of clients and fails to receive any results. The user then types the query count of subscribers and received the expected results.
You need to ensure that the user can use both queries to receive the same results.
Which four actions should you perform in sequence? To answer, move the appropriate actions form the list of actions to the answer area and arrange them in the correct order.

Answer:
Explanation: