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The main undo-related parameters are the UNDO_MANAGEMENT, UNDO_TABLESPACE, and UNDO_RETENTION parameters. Note that you can specify the undo-retention guarantee when you create the database by using the RETENTION GUARANTEE clause in the CREATE UNDO TABLESPACE statement.

(www.acme.com.EmployeeInfo)

If the UNDO_MANAGEMENT parameter is set to auto, the undo tablespace is used for storing the undo records, and Oracle will automatically manage the undo segments. Example: UNDO_MANAGEMENT = auto Default value: auto Parameter type: Static

The UNDO_TABLESPACE parameter determines the default tablespace for undo records. If you have only a single undo tablespace, you don t need to specify this parameter Oracle will automatically use your undo tablespace. If you don t have an undo tablespace available, Oracle will use the System rollback segment for undo storage, which isn t a good option. If you don t specify a value for this parameter when you create the database, and you have chosen to use Automatic Undo Management (AUM), Oracle will create a default undo tablespace with the name UNDOTBS. This default tablespace will have a single 10MB datafile that will be automatically extended without a maximum limit. Example: UNDO_TABLESPACE = undotbs1 Default value: The first undo tablespace available Parameter type: Dynamic. You can use the ALTER SYSTEM command to change the default undo tablespace.

The relational model has several limitations. One of its biggest problems is its limited capability to represent real-world entities, which are much more complex than what can be represented in tuples and relations. The model is especially weak when it comes to distinguishing among different kinds of relationships between entities. You can t represent and manipulate complex data in traditional relational databases the set of operations you can perform in relational models isn t adequate for many real-world applications that include objects with non-numerical attributes. The limitations of the traditional relational model in modeling several real-world entities led to research into semantic data models and the so-called extended relational data models. Two data models now compete for the mantle of successor to the relational model: the object-oriented data model and the object-relational data model. Databases based on the first model are called objectoriented database management systems, or OODBMSs, and databases based on the second model are called object-relational database management systems.

(192.168.1.3:2340.EmployeeInfo)

Object (or object-oriented) databases are based primarily on object-oriented programming languages such as C++, Java, and Smalltalk ODBMSs are created by combining database capabilities with the functionality of object-oriented programming languages In this sense, you can view an ODBMS as an extension of the object-oriented language with data-concurrency and data-recovery capabilities added on to it The object-oriented language is used both for application development and data storage Object-oriented languages are used to create objects, which are the basic components of the ODBMS Several terms have special meanings in object-oriented environments: Objects are defined as entities containing the attributes of a real-world object and its associated actions Properties are the various attributes of an object Methods are functions in the object world, and they define the behavior of the object Objects communicate by means of messages A class is a grouping of objects that have the same attributes.

Instances are the actual incarnations of objects in the class Classes can be divided into subclasses, with the parent class being called the superclass The following three concepts are fundamental to understanding object-oriented systems: Polymorphism: Polymorphism is the ability of objects to react differently when presented with different sets of information (in the form of parameters) Object-oriented languages allow different methods to be run depending on the set of parameters that you specify In a non-object-oriented programming language, the only way to complete two different tasks is to have two functions with different names Encapsulation: This term refers to objects including information about both what they are (their properties) and what they can do (their methods) Thus, code and data are packaged together.