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Database Administrator's Guide, 11g Release 1 (11.1)

Redefining Tables Online

Results of the Redefinition ProcessThe following are the end results of the redefinition process: The original table is redefined with

Database Performance Tuning Guide, 11g Release 1 (11.1)

Understanding Operating System Resources

9.4.4 Checking Process ManagementSeveral process management issues discussed in this section should be checked. 9.4.4.1 Scheduling … large SGA. Context switching is not an issue on Windows, which has only one process for each instance … , described in this section. 9.4.4.2.1 Post-wait Driver An Oracle process needs to be able to post another … Oracle process

Database Administrator's Guide, 11g Release 1 (11.1)

Process and Session Data Dictionary Views

Process and Session Data Dictionary ViewsDescription V$PROCESS Contains information about the currently active processes V$SESSION Lists

Multimedia Reference, 11g Release 1 (11.1)

Oracle Multimedia Relational Interface Reference

process( )Format process(imageBlob IN OUT NOCOPY BLOB, command IN VARCHAR2); Description Performs one or more

Multimedia Reference, 11g Release 1 (11.1)

ORDImage

process( )Format process(command IN VARCHAR2); Description Performs one or more image processing operations

Database Reference, 11g Release 1 (11.1)

Descriptions of Wait Events

process startupWait for a shared server, Dispatcher, or other background process to start. Wait Time: Wait up to 1 … second for a background process to start. If timed out, then re-wait until 5 minutes have passed … and signal an error. If the process has started, the event will acknowledge this. Parameter … Description type The process

Database Reference, 11g Release 1 (11.1)

V$PROCESS

V$PROCESSwhat latch a process is waiting for, the LATCHSPIN column indicates what latch a process is spinning on … Datatype Description ADDR RAW(4 | 8) Address of the process state object PID NUMBER Oracle process … identifier SPID VARCHAR2(24) Operating system process identifier USERNAME VARCHAR2(15) Operating

Database Concepts, 11g Release 1 (11.1)

Application Architecture

PMON processService registration relies on the PMON process —an instance background process—to register

Database Administrator's Guide, 11g Release 1 (11.1)

Controlling Trace Output Generated by the Archivelog Process

Controlling Trace Output Generated by the Archivelog Processprocess, you can control the output that is generated to the trace file. You do this by setting the … Track archivelog destination parameter modifications. 64 Track ARC n process state activity. 128 Track … LOG_ARCHIVE_TRACE parameter is 0. At this level, the archivelog process generates appropriate alert

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Overview of Oracle Database ProcessesThis section describes the two types of processes that run the Oracle database server code (server processes and background processes). It also describes the trace files and alert logs, which record database events for the Oracle Database processes. This section includes the following topics: Oracle Database Server Processes Oracle Database Background Processes Oracle Database Trace Files and the

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Oracle Database Trace Files and the Alert Logbackground process can write to an associated trace file. When a process detects an internal error, it dumps … files associated with a background process contain the name of the process that generated the trace

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Dispatcher Request and Response QueuesA number of different processes are needed in a shared server system: A network listener process … that connects the user processes to dispatchers or dedicated servers (the listener process is part of … shared servers, a user process must connect through Oracle Net Services or SQL*Net version 2, even if … the process

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Oracle Database Background ProcessesProcess (CKPT) Database Writer Process (DBW n ) Job Queue Processes Log Writer Process (LGWR) Process … Monitor Process (PMON) Queue Monitor Processes (QMN n ) Recoverer Process (RECO) System Monitor … Process (SMON) Other Oracle Database Background Processes On many

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Types of Processescode. They include server processes and background processes. The process structure varies for … . With dedicated server, for each user, the database application is run by a different process (a … user process) than the one that runs the Oracle database server code (a dedicated server process … ). With shared

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Connections and SessionsConnection and session are closely related to user process but are very different in meaning. A … connection is a communication pathway between a user process and an Oracle Database instance. A … that runs both the user process and Oracle Database) or network software (when different computers … specific connection of a user to

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Restricted Operations of the Shared Serverup by the next available shared server process. The request queue is in the SGA and is common to … for new requests, picking up new requests on a first-in-first-out basis. One shared server process … completed request to the appropriate user process. For example, in an order entry system each clerk's … user process

Database Concepts, 11g Release 1 (11.1)

Process Architecture

The Program InterfaceDatabase resident connection pooling enables you to freely scale your middle-tier hardware without worrying about running out of memory on the database side. This is because a smaller pool of dedicated server processes can serve a larger number of middle-tier processes. The default connection pool is called, SYS_DEFAULT_CONNECTION_POOL. To use database resident connection pooling, the database administrator

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Program Interface StructureThe program interface is the software layer between a database application and Oracle Database. The program interface: Provides a security barrier, preventing destructive access to the SGA by client user processes Acts as a communication mechanism, formatting information requests, passing data, and trapping and returning errors Converts and translates data, particularly between different types of

Database Concepts, 11g Release 1 (11.1)

Process Architecture

Oracle Database Server Processes, it is possible to combine the user process and corresponding server process into a single process to … computers, a user process always communicates with Oracle Database through a separate server process … buffers of the SGA, if the blocks are not already present in the SGA Return results in such a

Database Concepts, 11g Release 1 (11.1)

Process Architecture

9 Process ArchitectureThis chapter discusses the processes in an Oracle database system and the different configurations available for an Oracle database system. This chapter contains the following topics: Introduction to Processes Overview of User Processes Overview of Oracle Database Processes Shared Server Architecture Dedicated Server Configuration Database Resident Connection Pooling The Program Interface