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Table 1 Entities, the facts about them, and the roles those facts play in the business case Entity Discography Album Fact Contains Albums Consists of Tracks Has a Title Exists on Albums Is authored by Persons Is performed by Bands Has a Title Has a Track Number Type of fact Relationship Relationship Attribute Relationship Relationship Relationship Attribute Attribute

Physical migration methods will perform block-for-block copy of the database blocks from the source system to the destination Database Machine platform By the nature of their definition, these options are more rigid and inflexible in modifying the data within the blocks during the migration process Physical migration methods do not allow the implementation of Oracle Database best practices during the migration process If your strategy requires you to implement best practices as part of the migration, consider using the logical migration methods The key characteristics of physical methods are

Table 1 Entities, the facts about them, and the roles those facts play in the business case (continued) Entity Person Fact Authors Tracks Is in Bands Has a First Name Has a Middle Name Has a Last Name Performs Tracks Contains Persons Has a Name Has an Established date/time Has a Disbanded date/time Type of fact Relationship Relationship Attribute Attribute Attribute Relationship Relationship Attribute Attribute Attribute

method of finding phase angle in a circuit containing resistance and inductive reactance This method shows the actual impedance vector

Physical migration methods are generally faster than the logical migration methods, unless the logical method is moving far less data than the physical method

Entities are intellectual concepts representing objects (things) and subjects (persons) present in a particular business; in fact, they exist at the center of the business. Everything in any business revolves around the entities. In our case, we ve identified individual entities in Joe s statements. The position of the entities in regard to the business is reflected in our summary of Joe s explanations through the relationships that exist between them and the attributes that describe them. Put as simply as possible, a relationship can be represented by a verb designating an action or a state involving at least two entities. Verbs designating ownership, on the other hand, represent a different kind of relationship a reference to an attribute. Relationships describe what happens and/or what is in regard to several entities, whereas attributes describe a single entity.

The entity-relationship schema is an essential part of the logical model, though not the only one, just like the data store in itself is not the only part of a data-centric solution. Business logic is the other essential part of the logical model. It defines all the data management operations needed for maintenance of the business entities. For the purposes of this chapter, we ll focus on the basic operations presented in table 2.

phase angle is the angle between this vector and the R axis It will be the same as the angle of the slanted line in Fig 13-12

The physical migration is of complete databases and not subsets Moreover, these methods are not capable of performing a database upgrade during the migration The only exception to this is the Transportable Tablespace method, which in fact can upgrade the database during the migration

Table 2 Data management operations supported by our solution Operation Create Update Read Description Entity is created; the data is imported into the database. Entity is modified; the data in the database is changed. Entity is retrieved; the data is read from the database.

Setting the NULL specification of a column to allow or disallow NULLs is an important step in getting correct data. It s quite common to see that someone has created a perfectly acceptable design, but left each column nullable. Part of this is probably laziness, as not specifying a column s NULL specification will by default allow the column to allow NULL values. NULLs greatly increase the complexity of using a column, because NULL isn t equal to anything, including itself. But NULL = NULL isn t false; rather it evaluates to NULL. Then consider the expression NOT(NULL) which also evaluates to NULL, but really looks like it should be true, right You might be thinking that it s silly, that you d never need to care about this type of thing, right Well, consider the following:

NOTE It is recommended that you implement the Oracle Database best practices to unleash the full power of the Database Machine The important best practices are ASM allocation unit size of 4MB, the minimum 4MB database extent size, using SecureFiles for LOBs, table partitioning, and database compression technologies such as OLTP and EHCC