5 Copyright © 2005, Oracle. All rights reserved. Managing the Oracle Instance

5-2 Copyright © 2005, Oracle. All rights reserved. Objectives After completing this lesson, you should be able to do the following: Start up and shut down the Oracle instance View the parameters that are used to configure the Oracle instance Manage Oracle instance memory components

5-3 Copyright © 2005, Oracle. All rights reserved. Oracle Instance Management System Monitor SMON Database Writer DBW0 Check point CKPT Log Writer LGWR Process Monitor PMON Archiver ARC0 SGA Java pool Database buffer cache Redo log buffer Shared pool Large pool Control file Archived log files Data files Redo log files

5-4 Copyright © 2005, Oracle. All rights reserved. Oracle Memory Structures Java pool Database buffer cache Redo log buffer Shared pool Large pool SGA Server process 1 PGA Server process 2 PGA Back- ground process PGA

5-5 Copyright © 2005, Oracle. All rights reserved. Full Notes Page

5-6 Copyright © 2005, Oracle. All rights reserved. Oracle Processes System Monitor SMON Database Writer DBW0 Check- point CKPT Log Writer LGWR Process Monitor PMON Archiver ARC0 User process System Global Area (SGA) Background processes Server process User process Server process User process Server process User process Server process

5-7 Copyright © 2005, Oracle. All rights reserved. Full Notes Page

5-8 Copyright © 2005, Oracle. All rights reserved. Starting the Instance and Opening the Database Perform the following steps to make the database available for use: 1.Start the instance. (SGA is allocated and background processes are started.) 2.Mount the database. (Control file is read.) 3.Open the database. (Database is available for access.) Perform all three steps by clicking Startup in Enterprise Manager.

5-9 Copyright © 2005, Oracle. All rights reserved. Using Enterprise Manager to Start the Instance Click Startup/Shutdown to begin the startup process.

5-10 Copyright © 2005, Oracle. All rights reserved. Starting the Instance by Using Windows Services Start the following services: –OracleService –Oracle TNSListener –Oracle DBConsole Access services from Administrative Tools in the Control Panel.

5-11 Copyright © 2005, Oracle. All rights reserved. Viewing and Modifying Initialization Parameters

5-12 Copyright © 2005, Oracle. All rights reserved. Managing Memory Components You can manage memory components in the following ways: Using Automatic Shared Memory Management (recommended) –The Oracle server manages the amount of memory allocated to the shared pool, Java pool, database buffer cache, and large pool. –By using an initialization parameter, you specify the total memory to be allocated to the SGA. Managing component sizes through individual initialization parameters and using the Memory Advisor

5-13 Copyright © 2005, Oracle. All rights reserved. Enabling Automatic Shared Memory Management Click the Enable button to enable Automatic Shared Memory Management.

5-14 Copyright © 2005, Oracle. All rights reserved. Using Manual Shared Memory Management

5-15 Copyright © 2005, Oracle. All rights reserved. Viewing the Alert Log Click Alert Log Content to view the alert log.

5-16 Copyright © 2005, Oracle. All rights reserved. Summary In this lesson, you should have learned how to: Start the instance and open the database so that it is available for users View initialization parameter values Manage Oracle instance memory components

5-17 Copyright © 2005, Oracle. All rights reserved. Practice 5: Overview This practice covers the following topics: Using Enterprise Manager to start up and shut down the instance Viewing initialization parameters Viewing the alert log

5-18 Copyright © 2005, Oracle. All rights reserved.