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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 archivelog 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.

The amount of file system space you need depends primarily upon the total space you need to allocate for Oracle datafiles You use datafiles 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.

Two fields of ThreadSemaphore are particularly important in the interaction between the request and response threads: requestEvent and response. The former is of type ManualResetEvent, which is a process synchronization class used to block and resume the request thread. The latter is of type string and is used by the response thread to store the response message. When the request thread is resumed, the Send method that was woken up fetches the response from ThreadSemaphore and returns it to the caller. Figure 12-11 shows the class diagram of the connection Coordinator team.

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 datafiles to the undo tablespace 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 6, 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..

RequestQueue +Add() +Remove() +Get()

Implementation of the physical design involves creating the new database and allocating proper space for it. It also involves creating all the tables, indexes, and stored program code (such as triggers, procedures, and packages) to be stored on the server.