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ou can create an Oracle database as part of the Oracle software installation process in both Windows and UNIX versions The Oracle Universal Installer provides several templates for database creation, including the decision-support system (DSS) and online transaction processing (OLTP) templates You can also invoke the Oracle Database Configuration Assistant (DBCA), a GUI tool, which will guide you through the installation process Until you become very well versed in the creation of databases, however, you may be better off using the tedious but more flexible manual mode to create databases I recommend that you manually type in the database creation SQL statements line by line from SQL*Plus; this will give you insight into the various steps involved in creating a database and the potential problems at every stage.

Later on, when you re more comfortable with the process, you can just enter all the commands into a script and run the whole script to create other databases, or just use the DBCA Before you start creating an Oracle database, there are some steps you need to take: ensuring that you have the right permissions, checking that the file structures are in place, and determining whether you have sufficient resources to start up your new database Next you need to set up the initialization parameters for the database This chapter covers all of these topics and provides a summary of the important Oracle configuration (initialization) parameters, with guidelines for their use in your database.

The connection Coordinator team handles the main tasks of establishing a connection to a remote server, sending requests, and getting responses. When requests are sent in a pipelined mode, meaning that multiple requests are sent before any responses come back, the connection Coordinator team also handles the process of matching responses with requests. Figure 12-9 shows the basic activity diagram of the team. The connection Coordinator team is led by CoordinatorConnection, which handles all the threading logic. The team operates as follows: CoordinatorRequestHandler gets a CoordinatorConnection from the connection pool and calls the Coordinator with a sequence number to use. The Coordinator creates an HttpRequest object and uses it to send the request to the server. The request thread is then blocked, and a semaphore referencing the thread is stored in the blockedRequests collection, using the sequence number as a key. The semaphore is actually an object of class ThreadSemaphore. Figure 12-10 shows the class diagram. When a response arrives, it contains a sequence number. The blockedRequests collection is then checked for a ThreadSemaphore with that sequence number. The response thread then stores the response in the ThreadSemaphore object and unblocks the request thread.

After you create a new database, there are additional tasks you must perform, which I discuss in this chapter: running the necessary post database creation scripts, changing the passwords, and configuring the database for archive logging You ll need to know the various modes in which you can start an Oracle instance, as well as how to stop it in different modes and how to restrict access to just the DBAs when necessary To round out your basic knowledge, we ll look at how to quiesce and suspend a database, which you ll need to know to efficiently manage your databases, and how to drop an Oracle database with the DROP DATABASE command..

You can create a new database either manually (using scripts) or by using the Oracle Database Configuration Assistant. The DBCA is configured to appear immediately after the installation of the Oracle software to assist you in creating a database, and you can also invoke the DBCA later on to help you create a database. Whether you create a database manually or let Oracle create one for you at software installation time, a configuration file called init.ora, or its newer equivalent, SPFILE, holds all the database configuration details. After the initial creation of the database, you can always change the behavior of the database by changing the initialization parameters. You can also change the behavior of the database for brief periods or during some sessions by using the ALTER SYSTEM and ALTER SESSION commands to change certain initialization parameter values. Before you create a database, however, you need to make sure you have the necessary software and appropriate memory and storage resources. The next few sections run through the brief list of things to check.

Before you can create a database, you must first install the Oracle Database 11g software. If you haven t already done so, see 9, which covers the installation of the Oracle server software on UNIX and Linux systems.

-requestEvent -sequenceNumber -request -response -inUse -startTime +Wait() +Signal()