Download e-book for kindle: Database Directions: From Relational to Distributed, by James Larson

By James Larson

ISBN-10: 0132908670

ISBN-13: 9780132908672

With out stepping into the main points and complexities of particular advertisement items, this e-book introduces database administration innovations that transcend modern relational database administration structures - for example, dispensed, textual, multi-media and object-oriented. It covers disbursed database administration platforms, the dangers linked to them, and replacement ideas to the key pitfalls and technical difficulties; considers 3 different types of textual established structures info retrieval, hoovering and filtering - and describes a variety of methods to disbursed textual database administration platforms; explores DBMSs that deal with numerous new media kinds, and the distinctive difficulties brought by way of multimedia; and describes the fundamental rules of object-oriented facts and the categories of DBMS that deal with them.

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Extra info for Database Directions: From Relational to Distributed, Multimedia and Object-Oriented Database Systems

Sample text

The language of expressions remains unchanged, apart from the enrichment of types to include type variables. 28 The judgement forms are as follows: ∆ ∆ ∆ ∆ Γ τ :: κ τ has kind κ over ∆ τ1 ≡ τ2 :: κ τ1 and τ2 are equivalent constructors of kind κ σ σ1 ≡ σ2 ∆ e:σ σ is a valid type over ∆ σ1 and σ2 are equivalent types e has type σ relative to Γ and ∆ The judgement ∆ τ :: κ expresses that τ is a well-formed type constructor. This is just the judgement ∆ τ given above, but written using the more general notation.

51 Furthermore, the potential replication of the expression e in forming the substitution {Typ(e)/u}σ is suspect in the case that e can have an effect — two separate occurrences of e can have distinct meanings. But are these serious problems? Yes, unless further restrictions are imposed. Specifically, the type expression Typ(e) appears to stand for a specific type (“the type part of e”), even though e may not have a single, determinate type part! For example, e may be the expression if∃u::κ(σ) flip(∗) then e1 else e2 fi, where e1 and e2 are packages of type ∃u::κ(σ), each with distinct type components, and flip alternately yields true and false when applied to ∗.

2 Functional Kinds →,∀ have only one kind, the kind of types. To support The languages LΩ p and L→,∀ Ω type operators we enrich the language with functional kinds, as described by the following grammar: Kinds Constructors Type Contexts κ : : = Ω | κ1 ⇒ κ2 µ : : = t | → | fun (u:κ) in µ | µ1 (µ2 ) ∆ : : = ∅ | ∆[t :: κ] →,∀ →,∀ The extension of LΩ p with higher kinds is written LΩ,⇒p , and similarly L→,∀ Ω,⇒ with higher kinds. is the extension of L→,∀ Ω The rules for constructor formation are readily derived from those given in →,∀ Chapter 2 — the kind and constructor level of LΩ p is nothing more than a typed λ-calculus.

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Database Directions: From Relational to Distributed, Multimedia and Object-Oriented Database Systems by James Larson

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