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Installing the Oracle Software
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Before you can create a database, you must first install the Oracle Database 10g software. If you haven t already done so, see 7, which covers the installation of the Oracle server software on UNIX and Linux systems, or 20, which covers the same for Windows-based systems.
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Creating the File System for the Database
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Planning your file systems is an important task, and you need to complete it before you start creating the database. You have to plan the location of the various database files, such as the redo log files and archive log files before you create the database, and the placement of the files can have serious effects on performance down the road. Let s look at the sizing and location issues in some detail.
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Sizing the File System
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The amount of file system space you need depends primarily upon the total space you need to allocate for Oracle data files. You use data files to create the System and Sysaux tablespaces, as well as the undo tablespace, default permanent tablespace, redo logs, and files to hold application data (tables and indexes). Your overall space estimate should include space for the following: Tables and indexes: Table and index data is the biggest component of the physical database. You first need to estimate the size of all the tables, which you can base on the number and width of columns and the expected number of rows in each table. You don t need accurate numbers here; rough figures should suffice. You must know what indexes are needed by your application. You also need to know the type of indexes you re going to create, as this has a major bearing on the physical size of the indexes. You can use formulas to determine the space required for the indexes. Undo tablespace: How much space needs to be allocated to the undo tablespace depends on the size of your database and the nature of your transactions. If you anticipate a lot of large transactions, or you need to plan for large batch jobs, you will require a fairly large undo tablespace. You can always enlarge the undo tablespace later on by adding data files to the undo tablespace.
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CHAPTER 9 CREATING AN ORACLE DATABASE
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Temporary tablespace: The temporary tablespace size also depends on the nature of your application and the transaction pattern. If the queries involve a lot of sorting operations, you re better off with a larger temporary tablespace in general. Note that you ll be creating the temporary tablespace explicitly during creation of the database and assigning it to be the default temporary tablespace for the users in the database. Default permanent tablespace: As I explained in 7, it s a good idea to assign a default permanent tablespace for the database. All database users are automatically assigned the default permanent tablespace. System and Sysaux tablespaces: The System and Sysaux tablespaces are both mandatory tablespaces used by the database to store data dictionary information, and objects pertaining to various Oracle schemas. Redo log files: Redo log files are critical for the functioning of a database, and they re key components when you re trying to recover the database without any loss of committed data. Oracle recommends that you have a minimum of two redo log groups (with each group having one or more members). Redo log files need to be multiplexed that is, you should have more than a single redo log file in each group, because they re a critical part of the database and they re a single point of failure. With multiplexed redo logs, the instance will continue to run even if one copy of the redo log file is removed by error or is corrupted. The appropriate size for the redo log file will depend on how quickly your database is writing to the log. If you have a lot of DML operations in your database, and the redo logs seem to be filling up very quickly, you may want to increase the size of the log files. (You can t increase the size of an existing redo log file, but you can create larger redo log files and drop the smaller files.) The redo log files are written in a circular fashion, and your goal should be to size the log files such that no more than two or three redo log files are filled up every hour. The fundamental conflict here is between performance and recovery time. A very large redo log file will be efficient because there won t be many log switches and associated checkpoints, all of which impose a performance overhead on the database. However, when you need to perform recovery, larger redo logs take more time to recover from, because you have more data to recover. You can figure out the optimal redo log file size by looking at the OPTIMAL_LOGFILE_SIZE column of the V$INSTANCE_RECOVERY view, after your database has been running for a while. An easier way to get recommendations for the redo log file size is to view the Redo Log Groups page of the OEM Database Control.
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