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NEW QUESTION: 1
DRAG DROP
You plan to deploy a database to SQL Azure.
You must create two tables named Table 1 and Table 2 that will have the following specifications:
* Table1 will contain a date column named Column1 that will contain a null value approximately 80 percent of the time.
* Table2 will contain a column named Column2 which is the product of two other columns in Table2.
Both Table1 and Table2 will contain over one million rows.
You need to recommend which options must be defined for the columns. The solution must minimize the time it takes to retrieve data from the tables.
Which options should you recommend?
To answer, drag the appropriate options to the correct column in the answer area.
Answer:
Explanation:
Explanation:
* Sparse columns are ordinary columns that have an optimized storage for null values.
Sparse columns reduce the space requirements for null values at the cost of more overhead to retrieve nonnull values. Consider using sparse columns when the space saved is at least 20 percent to 40 percent.
* A Persisted column would be faster to retrieve.
* A computed column is computed from an expression that can use other columns in the same table. The expression can be a noncomputed column name, constant, function, and any combination of these connected by one or more operators.
Unless otherwise specified, computed columns are virtual columns that are not physically stored in the table. Their values are recalculated every time they are referenced in a query.
The Database Engine uses the PERSISTED keyword in the CREATE TABLE and ALTER
TABLE statements to physically store computed columns in the table. Their values are updated when any columns that are part of their calculation change.
References: Use Sparse Columns
Specify Computed Columns in a Table
NEW QUESTION: 2
솔루션 아키텍트는 5TB Amazon Redshift 클러스터를위한 재해 복구 솔루션을 설계하고 있습니다.
복구 사이트는 실제 사이트에서 805 킬로미터 이상 떨어져 있어야 합니다.
Architect는 이러한 요구 사항을 어떻게 충족해야 합니까?
A. AWS CloudFormation을 사용하여 두 번째 지역에 클러스터를 배포하십시오.
B. 클러스터의 스냅 샷을 만들어 다른 가용 영역에 복사하십시오.
C. 교차 리전 스냅 샷을 다른 리전으로 활성화합니다.
D. 두 영역에 걸쳐 있도록 Redshift 클러스터를 수정하십시오.
Answer: D
NEW QUESTION: 3
AS 71 has established an eBGP peer with AS 9925.
AS 71 includes hundreds of subnets from private network 10.0.0.0 /8. Which configuration will ensure that subnets of network 10.0.0.0 /8 are not advertised to AS 9925?
A. acl number 2001 rule permit source 10.0.0.0 0.255.255.255 route-policy NoTens permit node 100 if-match acl 2001 route-policy NoTens permit node 2001
B. acl number 2003 rule permit source 10.0.0.0 0.255.255.255 route-policy NoTens deny node 100 if-match acl 2003 route-policy NoTens permit node 255
C. acl number 2004 rule deny source 10.0.0.0 0.255.255.255 rule permit route-policy NoTens deny node 100 if-match acl 2004 route-policy NoTens permit node 2004
D. acl number 2002 rule deny source 10.0.0.0 0.255.255.255 rule permit route-policy NoTens permit node 100 if-match acl 2002 route-policy NoTens permit node 255
Answer: B
NEW QUESTION: 4
If two events A and B are mutually exclusive, what does the special rule of addition state?
A. P(A or B) = P(A) + P(B)
B. P(A and B) = P(A) + P(B)
C. P(A and/or B) = P(A) +P(B)
D. P(A or B) = P(A) - P(B)
E. None of these answers
Answer: A
Explanation:
Explanation/Reference:
Explanation:
The key word is that these events are mutually exclusive. So P(A or B) = P(A) + P(B). The probabilities stand alone.