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Codd also proposed a language for data access that was based on set theory (in the 1980s IBM would bring structured query language (SQL) to the world) To many professionals at the time, Codd s proposals seemed impossible to implement efficiently However, in the 1980s, Oracle became the first company to offer a commercial implementation of a relational database, and IBM began selling its relational database called DB2 Today the relational data model is predominant, and that is the model on which this chapter will focus With the advent of object-oriented programming, new data management designs called object-relational or object-oriented database management have been developed These systems promise convenience and congruity of operation with OO programming techniques While they have not yet become widely successful, they may become so in the future ADVANTAGES OF USING A DATABASE The primary motivation for using a database is speed of access.

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Assuming proper database design, access to individual pieces of information can be essentially instantaneous, regardless of the number of data records or the size of the database The experience of instantaneously finding exactly the record in which you are interested, from among millions, can be a stunning one Access speed can be essentially zero and constant, regardless of n, the number of records This can be expressed as O(k), where k is a constant of a small value Such performance becomes possible because the database management system stores data about the data (metadata) as well as the data itself Metadata also makes data stored in a database self-describing This means that programs accessing the data don t need to know so many details regarding how the data are stored If a program reads from an ordinary file, it must know about data types, formats, and the order of fields.

public class BinaryTree<E> extends AbstractCollection { protected E root; protected BinaryTree<E> left, right, parent; protected int size; public BinaryTree() { } public BinaryTree(E root) { this.root = root; size = 1; } public BinaryTree(E root, BinaryTree<E> left, BinaryTree<E> right) { this(root); if (left != null) { this.left = left; left.parent = this; size += left.size(); } if (right != null) { this.right = right; right.parent = this; size += right.size(); } } public boolean equals(Object object) { if (object == this) { return true; } else if (!(object instanceof BinaryTree)) { return false; } BinaryTree that = (BinaryTree)object; return that.root.equals(this.root) && that.left.equals(this.left) && that.right.equals(this.right) && that.parent.equals(this.parent) && that.size == this.size; } public int hashCode() { return root.hashCode() + left.hashCode() + right.hashCode() + size; } public int size() { return size; } public Iterator iterator() { return new java.util.Iterator() { // anonymous inner class private boolean rootDone; private Iterator lIt, rIt; // child iterators

CHAP. 11]

However, when a program reads from a database, it often needs only specify what information it requires A database also allows for efficient utilization of storage space One of the consequences of good database design is that duplication of data is minimized When mass storage devices were more expensive, this virtue was more important, but minimizing redundancy is still helpful in promoting efficiency, avoiding errors, and protecting against corruption of data Database management systems (DBMS) also promote data security in a variety of ways For instance, data backup and recovery facilities are always built into the DBMS, and data can be copied to a backup medium, even as the database continues to operate Database systems also support the concept of a transaction A transaction is a group of related changes to the data, where all changes must occur, or else none must occur.

public boolean hasNext() { return !rootDone || lIt != null && lIt.hasNext() || rIt != null && rIt.hasNext(); } public Object next() { if (rootDone) { if (lIt != null && lIt.hasNext()) { return lIt.next(); } if (rIt != null && rIt.hasNext()) { return rIt.next(); } return null; } if (left != null) { lIt = left.iterator(); } if (right != null) { rIt = right.iterator(); } rootDone = true; return root; } public void remove() { throw new UnsupportedOperationException(); } };

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