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All diagnostic files, including the trace files, are stored under the directory you specify for the DIAGNOSTIC_DEST initialization parameter. The trace directory under the ADR home directory holds the various trace files such as the debugging trace files for the background processes (log writer, database writer, and so on) that Oracle writes during instance operation. The alert directory under the ADR home directory contains the alert log file for the database instance (discussed in the previous section). The core directory under the ADR home directory holds any core files generated during major errors such as the ORA-600 internal Oracle software errors. The Oracle server will write all debugging trace files on behalf of a user process to the trace directory. All trace files you generate using Oracle s SQL tracing features (explained in s 19 and 20) will show up here.
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You can use backup files made either by yourself or by the RMAN backup and recovery tool to restore database files following a media failure or user error. The media failure may consist of an erroneously deleted database file or a damaged datafile. Regardless of the reason, the backup files help you restore the database and recover it to the present time with the help of the archived redo logs.
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Note An Oracle directory object is an alias for a file system directory. You use directory objects mainly when you use the external tables feature, which I explain in 14. Directory objects offer management flexibility by letting you reference operating system directories through a database object name. Directories aren t owned by any particular schema. You must grant users privileges on a particular directory before they can use it.
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Oracle server processes running under the operating system perform all the database operations, such as inserting and deleting data. These Oracle processes, together with the memory structures allocated to Oracle by the operating system, form the working Oracle instance. There is a set of mandatory Oracle processes that need to be up and running for the database to function at all. Other Oracle processes are necessary only if you are using certain specialized features of Oracle (such as replicated databases). A process is essentially a connection or thread to the operating system that performs a task or job. The Oracle processes you ll encounter in this section are continuous, which means that they come up when the instance starts, and they stay up for the duration of the instance s life. Thus, they act like Oracle s hooks into the operating system s resources. A process on a UNIX system is analogous to a thread on a Windows system. Oracle processes are divided into two general types both for efficiency and to keep client processes separate from the database server s tasks: User processes: These processes are responsible for running the application that connects the user to the database instance. Oracle processes: These processes perform the Oracle server s tasks, and you can divide them into two major categories: server processes and background processes. Together, these processes perform all the actual work of the database, from managing connections to writing to log files and datafiles to monitoring the user processes.
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User processes run application programs and Oracle tools, such as SQL*Plus. The user processes communicate with the server processes through the user interface and request that the Oracle server processes perform work on their behalf. Oracle responds by having its server processes service the user processes requests. It s the job of the server processes to monitor user connections, accept requests for data, and return the results to the users. All SELECT requests, for example, involve reading data from the database, and it s the server processes that return the output of the SELECT statement back to the users. You ll examine the two types of Oracle processes the server processes and the background processes in detail in the following sections.
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