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NEW QUESTION: 1
企業は、毎日100,000のソースから1,000万のデータレコードの安定したストリームを収集します。 これらのレコードは、Amazon RDS MySQL DBに書き込まれます。 クエリは、過去30日間のデータソースの1日の平均を生成する必要があります。 読み取りは書き込みの2倍あります。 収集されたデータへのクエリは、一度に1つのソースIDに対して行われます。
ソリューションアーキテクトは、このソリューションの信頼性と費用対効果をどのように改善できますか？
A. パーティションキーとしてソースIDを使用し、ソートキーとしてタイムスタンプを使用してAmazon DynamoDBを使用します。 Time to Live（TTL）を使用して、30日後にデータを削除します。
B. Amazon AuroraをマルチAZモードのMySQLで使用します。 追加の4つのリードレプリカを使用します。
C. パーティションキーとしてソースIDを使用してAmazon DynamoDBを使用します。 毎日異なるテーブルを使用してください。
D. 30日間の保持期間を使用してAmazon Kinesisにデータを取り込みます。 AWS Lambdaを使用して、データレコードを読み取りアクセス用にAmazon ElastiCacheに書き込みます。
Answer: A
Explanation:
Explanation
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Introduction.html
NEW QUESTION: 2
Business rules can be enforced within a database through the use of
A. Proxy
B. Views
C. Redundancy
D. Authentication
Answer: B
Explanation:
In database theory, a view consists of a stored query accessible as a virtual table in a relational database or a set of documents in a document-oriented database composed of the result set of a query or map and reduce functions. Unlike ordinary tables (base tables) in a relational database, a view does not form part of the physical schema: it is a dynamic, virtual table computed or collated from data in the database. Changing the data in a table alters the data shown in subsequent invocations of the view. In some NoSQL databases views are the only way to query data.
Views can provide advantages over tables: Views can represent a subset of the data contained in a table Views can join and simplify multiple tables into a single virtual table Views can act as aggregated tables, where the database engine aggregates data (sum, average etc.) and presents the calculated results as part of the data Views can hide the complexity of data; for example a view could appear as Sales2000 or Sales2001, transparently partitioning the actual underlying table Views take very little space to store; the database contains only the definition of a view, not a copy of all the data it presents Depending on the SQL engine used, views can provide extra security Views can limit the degree of exposure of a table or tables to the outer world Just as functions (in programming) can provide abstraction, so database users can create abstraction by using views. In another parallel with functions, database users can manipulate nested views, thus one view can aggregate data from other views. Without the use of views the normalization of databases above second normal form would become much more difficult. Views can make it easier to create lossless join decomposition.
The following answers are incorrect:
Proxy In computer networks, a proxy server is a server (a computer system or an application) that acts as an intermediary for requests from clients seeking resources from other servers. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource available from a different server. The proxy server evaluates the request according to its filtering rules. For example, it may filter traffic by IP address or protocol. If the request is validated by the filter, the proxy provides the resource by connecting to the relevant server and requesting the service on behalf of the client. A proxy server may optionally alter the client's request or the server's response, and sometimes it may serve the request without contacting the specified server. In this case, it 'caches' responses from the remote server, and returns subsequent requests for the same content directly.
Redundancy Redundancy is the duplication of critical components or functions of a system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe.
There are four major forms of redundancy, these are: Hardware redundancy, such as Fail-Over, Load Balancer, Stanby mechanisms, DMR, and TMR Information redundancy, such as Error detection and correction methods Time redundancy, including transient fault detection methods such as Alternate Logic Software redundancy
Redundancy allow you to avoid any single point of failure.
Authentication The ways in which someone may be authenticated fall into three categories, based on what are known as the factors of authentication: something you know, something you have, or something you are. Each authentication factor covers a range of elements used to authenticate or verify a person's identity prior to being granted access, approving a transaction request, signing a document or other work product, granting authority to others, and establishing a chain of authority.
Security research has determined that for a positive identification, elements from at least two, and preferably all three, factors be verified. The three factors (classes) and some of elements of each factor are:
the knowledge factors: Something the user knows (e.g., a password, pass phrase, or personal identification number (PIN)) the ownership factors: Something the user has (e.g., wrist band, ID card, security token, software token) the inherence factors: Something the user is or does (e.g., fingerprint, retinal pattern, DNA sequence, signature, face, voice, or other biometric identifier).
TWO FACTORS AUTHENTICATION When elements representing two factors are required for identification, the term two-factor authentication is applied. . e.g. a bankcard (something the user has) and a PIN (something the user knows). Business networks may require users to provide a password (knowledge factor) and a pseudorandom number from a security token (ownership factor).
The following reference(s) were/was used to create this question: Official (ISC)2 Guide to the CISSP CBK, Second Edition (2010) https://en.wikipedia.org/wiki/View_%28database%29 https://en.wikipedia.org/wiki/Redundancy_%28computer_science%29 https://en.wikipedia.org/wiki/Authentication
NEW QUESTION: 3
Because no employee wants to be associated with bad news in the eyes of a superior, information about serious problems at lower levels is progressively softened and distorted as it goes up each step in the management hierarchy. The chief executive is, therefore, less well informed about problems at lower levels than are his or her subordinates at those levels.
The conclusion drawn above is based on the assumption that
A. problem-solving ability is more important at higher levels than it is at lower levels of the management hierarchy
B. some employees are more concerned about truth than about the way they are perceived by their superiors
C. employees should be rewarded for accurately reporting problems to their superiors
D. chief executives obtain information about problems at lower levels from no source other than their subordinates
E. problems should be solved at the level in the management hierarchy at which they occur
Answer: D
Explanation:
Explanation/Reference:
Explanation:
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