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NEW QUESTION: 1
class Fibonacci extends RecursiveTask<Integer> {
final int n;
Fibonacci (int n) { this.n = n }
Integer compute () {
if (n <= 1)
return n;
Fibonacci f1 = new Fibonacci (n - 1);
f1.fork;
Fibonacci f2 = new Fibonacci (n - 2);
return f2.compute() + f1.join; // Line **
}
}
Assume that line ** is replaced with:
return f1.join() + f2.compute(); // Line **
A. Option A
B. Option F
C. Option D
D. Option B
E. Option E
F. Option C
Answer: D
Explanation:
Changing the code is not useful. In the original code (return f2.compute() + f1.join; )
f1 and f2 are run in parallel. The result is joined.
With the changed code (return f1.join() + f2.compute();) f1 is first executed and finished, then is f2
executed.
Note 1: The join method allows one thread to wait for the completion of another.
If t is a Thread object whose thread is currently executing,
t.join();
causes the current thread to pause execution until t's thread terminates.
Note 2: New in the Java SE 7 release, the fork/join framework is an implementation of the
ExecutorService interface that helps you take advantage of multiple processors. It is designed for
work that can be broken into smaller pieces recursively. The goal is to use all the available
processing power to enhance the performance of your application.
As with any ExecutorService, the fork/join framework distributes tasks to worker threads in a
thread pool. The fork/join framework is distinct because it uses a work-stealing algorithm. Worker
threads that run out of things to do can steal tasks from other threads that are still busy.
Reference: The Java Tutorials, Joins, Fork/Join
NEW QUESTION: 2
Which of the following statements about Reflection is correct?
A. Reflection is a new extension present only in PHP 7.0+
B. Built-in classes can be reflected on command line using php --re <classname>
C. Reflection only allows to reflect on built-in classes
D. Reflection is an extension that can be disabled
Answer: B
NEW QUESTION: 3
What is the correct order in which to start up the SAS servers and spawners?
A. Metadata server, batch server, objectspawner, OLAP server, pooled workspace server, stored process server, workspace server
B. Workspace server, stored process server, pooled workspace server, OLAP server, objectspawner, metadata server, batch server
C. Metadata server, objectspawner, OLAP server
D. Batch server, metadata server, objectspawner, OLAP server, pooled workspace server, stored process server, workspace server
Answer: C
NEW QUESTION: 4
You must configure an Oracle Data Guard environment consisting of:
1. A primary database
2. A Physical Standby Database
3. A Snapshot Standby Database
You must meet these requirements:
1. Primary database availability should not be compromised by the availability of the standby databases.
2. Under normal operations, transactions executed on the primary database should not commit before redo is written to disk on the primary database and on at least one standby database.
Which redo transport mode, and which protection mode should you configure to meet these requirements?
A. ASYNC and Maximum Performance
B. SYNC AFFIRM and Maximum Protection
C. SYNC NOAFFIRM and Maximum Protection
D. SYNC NOAFFIRM and Maximum Availability
E. SYNC AFFIRM and Maximum Availability
Answer: E
Explanation:
Explanation/Reference:
Explanation:
The Maximum Availability protection mode provides the highest level of data protection that is possible without compromising the availability of a primary database. Transactions do not commit until all redo data needed to recover those transactions has been written to the online redo log and to at least one synchronized standby database. If the primary database cannot write its redo stream to at least one synchronized standby database, it operates as if it were in maximum performance mode to preserve primary database availability until it is again able to write its redo stream to a synchronized standby database.
This mode ensures that no data loss will occur if the primary database fails, but only if a second fault does not prevent a complete set of redo data from being sent from the primary database to at least one standby database.
When a transport is performed using SYNC/AFFIRM, the primary performs write operations and waits for acknowledgment that the redo has been transmitted synchronously to the physical standby and written to disk. A SYNC/AFFIRM transport provides an additional protection benefit at the expense of a performance impact caused by the time required to complete the I/O to the standby redo log.
Incorrect Answers:
D: In the case of SYNC/NOAFFIRM, in which there is no check that data has been written to disk on the standby, there may be some data loss.
A, B: The Maximum Protection mode ensures that zero data loss occurs if a primary database fails. To provide this level of protection, the redo data needed to recover a transaction must be written to both the online redo log and to at least one synchronized standby database before the transaction commits. To ensure that data loss cannot occur, the primary database will shut down, rather than continue processing transactions, if it cannot write its redo stream to at least one synchronized standby database.
Because this data protection mode prioritizes data protection over primary database availability, Oracle recommends that a minimum of two standby databases be used to protect a primary database that runs in maximum protection mode to prevent a single standby database failure from causing the primary database to shut down.
E: The Maximum Performance protection mode provides the highest level of data protection that is possible without affecting the performance of a primary database. This is accomplished by allowing transactions to commit as soon as all redo data generated by those transactions has been written to the online log. Redo data is also written to one or more standby databases, but this is done asynchronously with respect to transaction commitment, so primary database performance is unaffected by delays in writing redo data to the standby database(s).
This protection mode offers slightly less data protection than maximum availability mode and has minimal impact on primary database performance.
This is the default protection mode.
References: https://docs.oracle.com/cd/B28359_01/server.111/b28294/protection.htm
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