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510-015 PDF DEMO:
QUESTION NO: 1
The titles table has 50,000 rows and a nonclustered index on the price column. Which of the following queries use less logical I/Os?
A. select "Min" = min(price), "Max" = max(price) from titles
B. select "Min" = (select min(price) from titles), "Max" = (select max(price) from titles)
C. They will both use the same number of I/Os
Answer: B
QUESTION NO: 2
The following query is executed frequently against the database. select a.au_fname, a.au_lname, ad.street, ad.city, ad.state, ad.zip
from authors a, author_address ad where a.au_id = ad.au_id What database denormalization technique could be used to improve the performance of this query?
A. Move the au_lname and au_fname columns to the author_address table.
B. Collapse the author_address and authors table into a single table.
C. Move the city, state, and zip columns to the authors table.
D. Create a view called mailing_address to eliminate the two table join from the query.
E. Add the redundant column au_id to the author_address table.
Answer: B
QUESTION NO: 3
An application uses stored procedures to perform updates, inserts and deletes for an OLTP application. Some update stored procedures optimize with a join order of table_A -> table_B. Other stored procedures optimize with a join order of table_B -> table_A. Which solution needs to be added within the stored procedures to guarantee that deadlocks are reduced or eliminated by always making the join order table_A -> table_B?
A. Non-correlated subqueries to force outside-in processing
B. SET FORCEPLAN ON
C. (index tableorder 1) - an index hint applied to table_A
D. SET SHOWPLAN ON
E. Define join-ordered Views on the affected tables
Answer: B
QUESTION NO: 4
What are some ways to reduce last data page lock contention for inserts? (Choose 3)
A. alter the table to use the Datarows locking scheme
B. alter the table to use the Datapages locking scheme
C. partition the table
D. create a clustered index on a random key
E. increase the server configuration for the number of locks
F. increase the server configuration for the deadlock checking period
Answer: ACD
QUESTION NO: 5
When a row is deleted on a table with datarows locking:
A. Rows on the page are moved up so the empty space is at the end of the page.
B. The space occupied by the deleted row is not reclaimed immediately.
C. The space occupied by the deleted row is filled with zeros.
D. The last row on the page is moved into the space created by the deleted row.
Answer: B
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Updated: May 27, 2022