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Transaction-control statements are used to control the changes made by data-manipulation SQL statements, such as INSERT, UPDATE, and DELETE. These are the four transaction-control statements: COMMIT: When this statement follows a set of DML statements, the changes will be made permanent. ROLLBACK: When this statement follows one or more DML statements, the changes made by the preceding statement or statements will be undone. If there are no save points, all statements from the beginning of the transaction will be rolled back. SAVEPOINT: This statement allows flexibility in your transactions, helping you set intermediate points in the transaction to which you can roll back (undo) your transactions. SET TRANSACTION: This rarely used statement denotes the start of a transaction and is used in statements like SET TRANSACTION READ ONLY.

Data definition language statements enable you to define the structure of the various schema objects in the Oracle database. DDL statements enable you to create, alter, and remove database objects, such as tables and indexes. These are some of the main uses of DDL statements: Creating tables, indexes, and other schema objects Creating and modifying procedures, functions, and packages Dropping and modifying database objects Creating and managing users of the database Granting and revoking privileges on objects Creating and altering tablespaces Creating and modifying database links

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In Oracle, a schema is defined as a collection of logical structures of data, or schema objects, although it is used mostly as a synonym for the database user (specifically, the application owner) that owns the schema pertaining to a specific application. Thus, the accounting schema within a company database would own all the tables and code pertaining to the accounting department. In addition to containing tables, a schema contains other database objects, such as PL/SQL procedures, functions and packages, views, sequences, synonyms, and clusters. This logical separation of the objects within the database allows you considerable flexibility in managing and securing your Oracle databases. Although the DBA can use the CREATE SCHEMA statement to populate a schema with database objects such as tables and views, more often the application owner creates the database objects and is referred to as the schema owner. The user who creates the objects owns database objects such as tables, views, procedures, functions, and triggers. The owner of the object has to explicitly assign specific rights to other users, such as SELECT or UPDATE, if those other users are to use the objects.

Biological systems, while infinitely more complex that any software system today, are a reminder of this For example, the cortex of the human brain is a large network of neurons, but looking at a neuron doesn t even begin to describe how the brain works at a higher level You d be hard-pressed to find a person s aspirations or beliefs by looking at their brain under a microscope But before I go too far off track, let s come back to reality and look at the most important roles in more depth..

Oracle Database 11g is an object-relational database and, as such, it allows users to define several types of data other than the standard relational data types. These user-defined data types include the following: Object types: These complex types are an abstraction of real-world entities. Array types: These types are used to create ordered sets of data elements of the same type. Table types: These types are used to create an unordered set of data elements of the same data type. XML schema: This is a new object type that is used to create types and storage elements for XML documents based on the XML schema. The Appendix provides examples of how to create various kinds of user-defined object types. In this chapter, the focus is on the traditional relational objects.

The V$WAITCLASSMETRIC view shows metric values of wait classes for the most recent 60-second interval. The view keeps information for up to one hour. Here s an example of using the query: SQL> 2 3 4* SELECT WAIT_CLASS#, WAIT_CLASS_ID dbtime_in_wait,time_waited,wait_count FROM v$waitclassmetric ORDER BY time_waited DESC;

Workers are the objects or components that implement the business logic of a system. To use a human metaphor, workers represent the skilled labor of a system. If software systems were implemented in hardware, workers would be the custom chips that do all the business-specific or application-specific work, delivering the most valuable services. Virtually no useful software system can be built without workers, because such a system would contain no business logic. Workers are also known in the literature as business components.2

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