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Oracle Enterprise Manager is Oracle s GUI-based management tool that lets you manage one or more databases efficiently. OEM enables security management, backups, and routine user and object management. Because OEM is GUI-based, you don t have to know a lot of SQL to use the tool. However, understanding the V$ and dynamic performance views will enhance your knowledge of how the database works OEM will be an even more powerful tool in your hands after you master the management of the database using the data dictionary based and dynamic performance table based SQL queries. Oracle has really improved OEM in its most recent versions, and all serious practitioners of the trade should master the use of the tool for both daily database management and scheduling routine database administration tasks and troubleshooting. 4 explains the configuration and use of the OEM tool set. In Oracle Database 11g, you have the option of using either the Database Control or Grid Control version of Enterprise Manager. The Enterprise Manager Database Control is automatically installed along with the Oracle software and is designed to run as a stand-alone application. In order to manage several databases, however, you need to separately install the Enterprise Manager Grid Control software on your server and the OEM Agent software on all the targets you wish to monitor. The Oracle Enterprise Manager tool always looked promising in previous versions, but it delivered inconsistent performance. This hard reality, plus the fact that many DBAs are comfortable with manual commands and scripts based on the database dictionary and the dynamic (V$) views, led to a low acceptance rate of the tool. Since the Oracle Database 10g release, the OEM tool has gone through a sea change and delivers high-level performance. I strongly recommend using the Database Control or the Grid Control tool to monitor and manage your databases. You can invoke all the new management advisors and tools, like the ADDM from the OEM toolset, without having to use complex Oracle PL/SQL packages. I show OEM examples throughout this book.
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CH A PT ER 5 O RAC LE D AT ABA SE 11G A RCH I TEC TURE
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Note Traditionally, all GUI tools relied on the same V$ performance views that are used in database queries. However, OEM can access key performance data directly from the SGA, without making any SQL queries. This is done by attaching directly to the SGA and reading the statistics from the shared memory. When your database is performing extremely slowly or hangs, you can t rely on the dynamic V$ views to troubleshoot the problem doing so may actually end up making matters worse! This is one more reason why you should make the OEM your main means of monitoring and managing the Oracle instance.
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SQL*Plus is an Oracle tool that lets you enter and run SQL statements and PL/SQL (a procedural extension to the Oracle SQL language) blocks. As a DBA, you can perform all your tasks right from the SQL*Plus interface itself. However, as I explain in the previous section, you may want to make the SQL*Plus interface your secondary, rather than primary, tool for accessing the Oracle RDBMS. I discuss SQL*Plus in detail in 4.
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Oracle provides several powerful tools to help with loading and unloading of data and similar activities. The following sections describe the main ones.
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The Data Pump Export and Import utilities are the successors to the traditional export and import utilities; they help with fast data loading and unloading operations. The original export and import utilities are still available, but Oracle recommends the use of the newer and more sophisticated tools. 13 discusses the Data Pump utilities in detail.
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SQL*Loader
The SQL*Loader is a powerful and fast utility that loads data from external files into tables of an Oracle database. 14 discusses SQL*Loader in detail.
Note You use the SQL*Loader to load external data into an Oracle table. Sometimes, though, you need to use some external data but don t want to go to the trouble of loading the data into a table. The external tables feature offers some of the SQL*Loader utility s functionality.
External tables let you use data that resides in external text files as if it were in a table in an Oracle database. You can write to external tables as well as read from them. I describe the external tables in detail in 13.
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