Download Expert Oracle9i Database Administration by Sam R. Alapati PDF

By Sam R. Alapati

A great e-book masking all crucial DBA subject matters for Oracle 9i management. defined rather well masking In-depth information, Illustrations and examples makes this e-book helpful. i exploit it as a real resource of reference and that i will strongly suggest this publication.

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You can take a table through several levels of simplification. These simpler forms are called the first normal form (1NF), second normal form (2NF), third normal form (3NF), Boyce-Codd normal form (BCNF), fourth normal form (4NF), and fifth normal form (5NF). Note that each successively higher stage of the normalization process eliminates a particular type of an undesirable dependency that you saw earlier in this section. For most database needs, a simplification to the level of the 3NF is deemed sufficient.

For example, you cannot insert a customer's data because that customer has not bought a product from your warehouse yet. • The deletion anomaly. In this anomaly, you could end up losing data inadvertently because you are trying to remove some duplicate attributes from a customer's data. Let's look at an example of a data anomaly caused by nonnormalized data. Table 2-1 shows the kind of data that could lead to such problems. Table 2-1: Example of a Non-Normalized Table CUSTOMER ID NAME 38 CITY PHONE PRODUCT ID Chapter 2: Relational Database Modeling and Database Design Chapter 2: Relational Database Modeling and Database Design 212 212 524 39 Thomas Manhattan 932-795-2627 236789 Thomas Manhattan 932-795-2627 487218 Copeland Kansas City 675-938-9256 186308 You can see that the details for the customer Thomas had to be repeated completely because he bought different products.

If there is no appropriate field you can choose as a primary key, you can use system-generated numbers to uniquely identify your rows. A primary key must be unique and present in every row of the table to maintain the validity of the data. You must select the primary keys from among the list of candidate keys for all the tables in your database. If you are using software to model the data, it is likely that you will already have defined and created all the keys for each entity. The application team determines the best candidates for the primary keys.

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