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In Standard C++ it is possible to have new return null instead of throwing an exception when an allocation failure occurs This form of new is most useful when you are compiling older code with a modern C++ compiler It is also valuable when you are replacing calls to malloc( ) with new (This is common when updating C code to C++) This form of new is shown here: p_var = new(nothrow) type; Here, p_var is a pointer variable of type The nothrow form of new works like the original version of new from years ago Since it returns null on failure, it can be "dropped into" older code without having to add exception handling However, for new code, exceptions provide a better alternative To use the nothrow option, you must include the header <new> The following program shows how to use the new(nothrow) alternative

The logical database design phase transforms the conceptual data model into a format un derstandable by a commercial DBMS The logical design phase is not concerned with effi cient implementation Rather, the logical design phase is concerned with refinements to the conceptual data model The refinements preserve the information content of the conceptual data model while enabling implementation on a commercial DBMS Because most busi ness databases are implemented on relational DBMSs, the logical design phase usually pro duces a table design The logical database design phase consists of two refinement activities: conversion and normalization The conversion activity transforms ERDs into table designs using conversion rules As you will learn in 3, a table design includes tables, columns, primary keys, foreign keys (links to other related tables), and other properties For example, the ERD in Figure 24 is converted into two tables as depicted in Figure 25 The normalization activity removes redundancies in a table design using constraints or dependencies among columns 6 presents conversion rules while 7 presents normalization techniques

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Sec 4-3

4-3-3 Index Manipulation A multilevel index is used to access the data records The index is considered to be a separate but related le The index entries at the lowest level point to the beginning of the train, but the value associated with each index entry is the highest or last value in the train Every train in a portion has an index entry, but entries for free trains do not have a key value and are collected at the end of the index The assignment of elds within a single index train is given in Fig 4-17 The index entries in a train are grouped into section to accelerate the search within a block

// Demonstrate nothrow version of new #include <iostream> #include <new> using namespace std; int main() { int *p, i; p = new(nothrow) int[32]; // use nothrow option if(!p) { cout << "Allocation failure\n";

2

A decision criterion which appears throughout this book is the concept of binding Binding measures the extent to which exibility has been traded for e ciency We have identi ed binding choices in le structures, in database models, in schema management, in information retrieval, and in the maintenance of data and integrity protection If much exibility is required, the system will be loosely bound at many levels: the record structure will be variable, the access paths will be easily augmented or deleted, the schema will be able to accept changes, and the query-processing system will be able to interpret changes made at any time If performance is important, constraints will be imposed on some of the levels, but at some other levels exibility should be retained The concept of binding can promote a common understanding among the people involved in the system development process A general problem in database design is that it involves the bringing together of people from many disciplines, both as users and as implementers

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