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Oracle recommends that you have four redo log groups, to keep the log writer from having to wait for an available group after each log switch. The members of the redo log groups (the redo log files) should be the same size. Oracle suggests sizing the redo log files such that they switch about every 20 minutes during a busy workload and about once an hour during normal workloads.
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Flash recovery area: Oracle recommends that you create a flash recovery area to hold all database backup- and recovery-related files needed for a recovery from a media failure. The flash recovery area holds all data file backups, RMAN backups, flashback logs, archived redo log files, and control file backups. The size of the flashback area depends on the size and frequency of your backups and on how long you want to retain backups on disk. For example, if you plan on taking weekly backups, you must allocate enough space in the flash recovery area to hold one week s full backups as well as the archived redo logs. If you plan on taking incremental backups in between the weekly full backups, you must also allocate space for those backups in the flash recovery area.
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CHAPTER 9 CREATING AN ORACLE DATABASE
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Choosing the Location for the Files
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You should place the database files, such as the system, redo log, and archive log files, in locations that allow you to benefit from the OFA guidelines, which were discussed in 7. Following the OFA guidelines for file placement in your database offers the following benefits: Makes it easy for you to locate and identify the various files, such as database files, control files, and redo log files Makes it easy to administer multiple Oracle databases and multiple Oracle software versions Improves database performance by minimizing contention among the different types of files If you followed the OFA guidelines while installing your software, you should be in good shape regarding the way your files are physically laid out.
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Ensuring Enough Memory Is Allocated
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If you don t have enough memory in the system to satisfy the requirements of your database, your database instance will fail to start. Even if it does start, there will be a lot of memory paging and swapping that will slow your database down. The cost of memory is such a small component of enterprise computing costs these days that you re better off getting a large amount of memory for the server on which you plan to install the Oracle database. In the SGA_TARGET section of this chapter, I ll show you how to set up automatic shared memory management, which enables Oracle to take care of sizing the individual components of shared memory.
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Getting Necessary Authorizations
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You will need authorization to be granted by the UNIX/Linux system administrator for you to be able to create file systems on the server. Your Oracle username should be included in the DBA group by the system administrator, if you are working on a UNIX or a Linux server.
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Setting the OS Environment Variables
Before you proceed to create the database, you must set all the necessary operating system environment variables. In UNIX and Linux environments, you must set the following environment variables: ORACLE_SID: This is your database s name and same as the value of the DB_NAME initialization parameter. ORACLE_BASE: This is the top directory for the Oracle software. For this chapter s purposes, this is /u01/app/oracle. ORACLE_HOME: This is the directory in which you installed the Oracle software. Oracle recommends you use the following format for this variable: $ORACLE_BASE/product/release/db_n. For this chapter s purposes, this directory is /u01/app/oracle/product/10.2.0.0/db_1. PATH: This is the directory in which Oracle s executable files are located. Oracle s executables are always located in the $ORACLE_HOME/bin directory. You can add the location of Oracle s executable files to the existing PATH value in the following way: export PATH=$PATH:$ORACLE_HOME/bin LD_LIBRARY_PATH: This variable points out where the Oracle libraries are located. The usual location is the $ORACLE_HOME/lib directory.
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