Download Administering a SQL Database Infrastructure.70-764.PrepAway.2021-03-18.443q.tqb

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Vendor: Microsoft
Exam Code: 70-764
Exam Name: Administering a SQL Database Infrastructure
Date: Mar 18, 2021
File Size: 22 MB
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Demo Questions

Question 1
You manage a SQL Server 2014 instance that contains a database named DB1. 
Users report that some queries to DB1 take longer than expected. 
Although most queries run in less than one second, some queries take up to 20 seconds to run. You need to view all of the performance statistics for each database file. 
Which method should you use?
  1. Query the sys.dm_os_tasks dynamic management view.
  2. Query the sys.dm_os_performance_counters dynamic management view.
  3. Query the sys.dm_io_virtual_file_stats dynamic management function.
  4. Examine the Data File I/O pane in Activity Monitor.
Correct answer: C
Explanation:
sys.dm_io_virtual_file_stats Returns I/O statistics for data and log files.
sys.dm_io_virtual_file_stats Returns I/O statistics for data and log files.
Question 2
You are creating a database that will store usernames and credit card numbers for an application. You need to recommend a solution to store and reuse the credit card numbers in the database.  
What should you recommend? More than one answer choice may achieve the goal. Select the BEST answer.
  1. Data encryption
  2. Transparent Data Encryption (TDE)
  3. Encrypting File System (EFS)
  4. Data hashing
Correct answer: A
Explanation:
If we are going to encrypt credit card number for storage, then we should have Data Encryption Key(DEK) for encrypting the credit card number.
If we are going to encrypt credit card number for storage, then we should have Data Encryption Key(DEK) for encrypting the credit card number.
Question 3
You need to recommend an isolation level for usp_UpdateOrderDetails. 
Which isolation level should recommend?
  1. Read committed
  2. Repeatable read
  3. Read uncommitted
  4. Serializable
Correct answer: B
Explanation:
- Scenario: Databasel will also contain a stored procedure named usp_UpdateOrderDetails.  The stored procedure is used to update order information. The stored procedure queries the Orders table twice each time the procedure executes.  The rows returned from the first query must be returned on the second query unchanged along with any rows added to the table between the two read operations. - REPEATABLE READ Specifies that statements cannot read data that has been modified but not yet committed by other transactions and that no other transactions can modify data that has been read by the current transaction until the current transaction completes.
- Scenario: Databasel will also contain a stored procedure named usp_UpdateOrderDetails.  The stored procedure is used to update order information. The stored procedure queries the Orders table twice each time the procedure executes.  The rows returned from the first query must be returned on the second query unchanged along with any rows added to the table between the two read operations. 
- REPEATABLE READ Specifies that statements cannot read data that has been modified but not yet committed by other transactions and that no other transactions can modify data that has been read by the current transaction until the current transaction completes.
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