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Q1226755
Arquitetura de Computadores
Seja N uma base de numeração, e os números A = (100)ₙ , B = (243)₍ₙ₊₁₎, C = (30)ₙ , D = F₁₆ e E = (110)₂. Sabendo-se que a igualdade B + D = A + E.C é válida, o produto de valores válidos para a base N é
Q1223374
Arquitetura de Software
Design Patterns
Design Patterns A design pattern is often posed as a question: how do we solve some design problem? However a design problem is, by its nature, nonspecific, and rarely has a single straight-forward answer. There might be several ways to solve the same problem, some better than others depending on the specific situation and the specific context of the problem. A design pattern is intended to share not just solutions but a better understanding of both the problem and how it might be solved.
Firstly, patterns have a well-defined structure. This consistent layout makes it easy to browse through a collection of patterns to find relevant help and then dive further into the material. The structure encourages the author of the pattern to think carefully about the knowledge they're sharing, whilst making the material more consistently accessible to a reader.
Secondly, unlike a tutorial or recipe which typically guides you through a single approach to solving a problem, patterns encourage discussion of related and complementary approaches. Design decisions are rarely clear cut, so it can be useful to understand the context in which a decision is made and the resulting trade-offs. Communicating these nuances is how we share knowledge rather than just fixes for a problem.
Consider the following sentence from the text: “Design decisions are rarely clear cut, so it can be useful to understand the context in which a decision is made and the resulting trade-offs”. Taking into consideration the underlined excerpt from the sentence, it is correct to say that design decisions are:
Design Patterns A design pattern is often posed as a question: how do we solve some design problem? However a design problem is, by its nature, nonspecific, and rarely has a single straight-forward answer. There might be several ways to solve the same problem, some better than others depending on the specific situation and the specific context of the problem. A design pattern is intended to share not just solutions but a better understanding of both the problem and how it might be solved.
Firstly, patterns have a well-defined structure. This consistent layout makes it easy to browse through a collection of patterns to find relevant help and then dive further into the material. The structure encourages the author of the pattern to think carefully about the knowledge they're sharing, whilst making the material more consistently accessible to a reader.
Secondly, unlike a tutorial or recipe which typically guides you through a single approach to solving a problem, patterns encourage discussion of related and complementary approaches. Design decisions are rarely clear cut, so it can be useful to understand the context in which a decision is made and the resulting trade-offs. Communicating these nuances is how we share knowledge rather than just fixes for a problem.
Consider the following sentence from the text: “Design decisions are rarely clear cut, so it can be useful to understand the context in which a decision is made and the resulting trade-offs”. Taking into consideration the underlined excerpt from the sentence, it is correct to say that design decisions are:
Q1207847
Banco de Dados
Um usuário reclama que o banco de dados está inconsistente.
Abaixo, uma parte do relatório que ele executa.
(...)
(1) select idproduto, quantidade from estoque;
(...)
(2) select count(*) from estoque;
(...)
Ele verifica que, frequentemente, o select (1) retorna uma quantidade de registros diferente da contagem em (2). Como se pode explicar o que está ocorrendo e qual a solução para o problema?
Abaixo, uma parte do relatório que ele executa.
(...)
(1) select idproduto, quantidade from estoque;
(...)
(2) select count(*) from estoque;
(...)
Ele verifica que, frequentemente, o select (1) retorna uma quantidade de registros diferente da contagem em (2). Como se pode explicar o que está ocorrendo e qual a solução para o problema?
Q1207835
Banco de Dados
Durante a utilização de um banco de dados, diversos problemas podem ocorrer devido à concorrência entre transações.
Sobre os níveis de isolamento, tem-se que o nível
Sobre os níveis de isolamento, tem-se que o nível
Q1207810
Sistemas Operacionais
A WAN da empresa é formada pela rede local da matriz em
SP e pelas redes locais das filiais em SC, RS e PR. É necessário limitar o número de usuários com permissões de Administrador de todos os recursos do domínio, ou seja, usuários que serão incluídos no grupo Admins. do Domínio (Domain Admins.). Porém, alguns usuários devem ter permissão para gerenciar recursos tais como: contas de usuários e computadores, em cada uma das redes locais. O tipo de objeto do Active Directory utilizado para implementar a solução proposta é:
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