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NEW QUESTION: 1
A national retail chain needs to design an IP addressing scheme to support a nationwide network.
The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet.
Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme? (Choose two.)
A. 255.255.255.224
B. 255.255.252.0
C. 255.255.255.128
D. 255.255.255.192
E. 255.255.255.0
F. 255.255.248.0
Answer: C,D
Explanation:
Explanation/Reference:
50 hosts per subnet, so we'd need a range of 64 IP addresses which is a /26. This converts to a mask of
255.255.255.192.

NEW QUESTION: 2
You have an application named App1 that uses a Microsoft Azure SQL database.
Some users report that they receive messages similar to the following error message: "Transaction (Process ID65) was deadlocked on locked resources with another process and has been chosen as the deadlock victim. Rerun the transaction." You need to identify the cause of the error.
Which view should you query?
A. sys.dm_tran_locks
B. sys.event_log
C. sys.resource_stats
D. sys.dm_os_wait_stats
Answer: D
Explanation:
Explanation/Reference:
Explanation:
sys.dm_os_wait_stats returns information about all the waits encountered by threads that executed. One type if waits is queue waits, which occur when a worker is idle, waiting for work to be assigned. Queue waits are most typically seen with system background tasks such as the deadlock monitor and deleted record cleanup tasks.
Incorrect Answers:
D: sys.dm_tran_locks returns information about currently active lock manager resources in SQL Server
2017. Each row represents a currently active request to the lock manager for a lock that has been granted or is waiting to be granted.
The columns in the result set are divided into two main groups: resource and request. The resource group describes the resource on which the lock request is being made, and the request group describes the lock request.
Reference: https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/ sys-dm-os-wait-stats-transact-sql?view=sql-server-2017

NEW QUESTION: 3

A. Option D
B. Option C
C. Option B
D. Option A
Answer: D

NEW QUESTION: 4
Examine Exhibit 1 to view the query and its execution plan.

Examine Exhibit 2 to view the structure and indexes for the EMPLOYEES and DEPARTMENTS tables.

Examine Exhibit 3 to view the initialization parameters for the instance.

Why is sort-merge join chosen as the access method?
A. Because of an inequality condition.
B. Because the data is not sorted in the LAST_NAME column of the EMPLOYEES table
C. Because of the LIKE operator used in the query to filter out records
D. Because the OPTIMIZER_MODE parameter is set to ALL_ROWS.
Answer: D
Explanation:
Incorrect:
B: There is not aninequality conditionin the statement.
C: Merge joins are beneficial if the columns are sorted.
D:All regular joins should be able to use Hash or Sort Merge, except LIKE, !=, and NOT ...
joins.
Note: *A sort merge join is a join optimization method where two tables are sorted and then joined. *A "sort merge" join is performed by sorting the two data sets to be joined according to the join keys and then merging them together. The merge is very cheap, but the sort can be prohibitively expensive especially if the sort spills to disk. The cost of the sort can be lowered if one of the data sets can be accessed in sorted order via an index, although accessing a high proportion of blocks of a table via an index scan can also be very expensive in comparison to a full table scan.
*Sort merge joins are useful when the join condition between two tables is an inequality condition (but not a nonequality) like <, <=, >, or >=. Sort merge joins perform better than nested loop joins for large data sets. You cannot use hash joins unless there is an equality
condition.
*When the Optimizer Uses Sort Merge Joins
The optimizer can choose a sort merge join over a hash join for joining large amounts of
data if any of the following conditions are true:
/The join condition between two tables is not an equi-join.
/Because of sorts already required by other operations, the optimizer finds it is cheaper to
use a sort merge than a hash join.
Reference: OracleDatabase Performance Tuning Guide,Sort Merge Joins