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NEW QUESTION: 1
You are analyzing the performance of a database environment.
Applications that access the database are experiencing locks that are held for a large amount of time. You are experiencing isolation phenomena such as dirty, nonrepeatable and phantom reads.
You need to identify the impact of specific transaction isolation levels on the concurrency and consistency of data.
What are the consistency and concurrency implications of each transaction isolation level? To answer, drag the appropriate isolation levels to the correct locations. Each isolation level may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.
Answer:
Explanation:
Explanation
Read Uncommitted (aka dirty read): A transaction T1executing under this isolation level can access data changed by concurrent transaction(s).
Pros:No read locks needed to read data (i.e. no reader/writer blocking). Note, T1 still takes transaction duration locks for any data modified.
Cons: Data is not guaranteed to be transactionally consistent.
Read Committed: A transaction T1 executing under this isolation level can only access committed data.
Pros: Good compromise between concurrency and consistency.
Cons: Locking and blocking. The data can change when accessed multiple times within the same transaction.
Repeatable Read: A transaction T1 executing under this isolation level can only access committed data with an additional guarantee that any data read cannot change (i.e. it is repeatable) for the duration of the transaction.
Pros: Higher data consistency.
Cons: Locking and blocking. The S locks are held for the duration of the transaction that can lower the concurrency. It does not protect against phantom rows.
Serializable: A transaction T1 executing under this isolation level provides the highest data consistency including elimination of phantoms but at the cost of reduced concurrency. It prevents phantoms by taking a range lock or table level lock if range lock can't be acquired (i.e. no index on the predicate column) for the duration of the transaction.
Pros: Full data consistency including phantom protection.
Cons: Locking and blocking. The S locks are held for the duration of the transaction that can lower the concurrency.
References:
https://blogs.msdn.microsoft.com/sqlcat/2011/02/20/concurrency-series-basics-of-transaction-isolation-levels/
NEW QUESTION: 2
Which of the following will you need to run Windows 7 installations automatically with preconfigured settings?
A. An answer file to embed on the installation media or WDS distribution folder
B. The latest Windows Defender application
C. A bootable USB device that contains all drivers and necessary software to complete the installation
D. A secure locked cable
Answer: A
Explanation:
You will need an answer file to embed on the installation media or WDS distribution folder to run Windows 7 installations automatically with preconfigured settings. Windows Deployment Services is the updated and redesigned version of Remote Installation Services (RIS). A user can use it to install Windows to computers over a network instead of installing each operating system directly from a CD or DVD. A user should have a working knowledge of common desktop deployment technologies and networking components, including Dynamic Host Configuration Protocol (DHCP), Domain Name System (DNS), and Active Directory Domain Services to use Windows Deployment Services.
NEW QUESTION: 3
A global retailer is setting up the cloud architecture to be deployed in Oracle Cloud infrastructure (OCI) which will have thousands of users from two major geographical regions: North America and Asia Pacific. The requirements of the services are:
* Service needs to be available 27/7 to avoid any business disruption
* North American customers should be served by application running In North American regions
* Asia Pacific customers should be served by applications running In Asia Pacific regions
* Must be resilient enough to handle the outage of an entire OCI region
A. OCl DNS, Traffic Management with Geolocation steering policy. Health Checks
B. OCl DNS, Traffic Management with Geolocation steering policy
C. OCl DNS,' Traffic Management with Load Balancer steering policy, Health Checks
D. OCl DNS, Traffic Management with Failover steering policy
Answer: A
Explanation:
GEOLOCATION STEERING
Geolocation steering policies distribute DNS traffic to different endpoints based on the location of the end user. Customers can define geographic regions composed of originating continent, countries or states/provinces (North America) and define a separate endpoint or set of endpoints for each region. Combine with Oracle Health Checks to fail over from one region to another
NEW QUESTION: 4
A user authenticating with Amazon Cognito will go through a multi-step process to bootstrap their credentials.
Amazon Cognito has two different flows for authentication with public providers.
Which of the following are the two flows?
A. Enhanced and basic
B. Authenticated and non-authenticated
C. Single step and multistep
D. Public and private
Answer: A
Explanation:
Explanation/Reference:
Explanation:
A user authenticating with Amazon Cognito will go through a multi-step process to bootstrap their credentials. Amazon Cognito has two different flows for authentication with public providers: enhanced and basic.
http://docs.aws.amazon.com/cognito/devguide/identity/concepts/authentication-flow/
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