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Figure 4-2 Connected to the default PostgreSQL server
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contains all of the files necessary to run the database Now it is time to see what these files contain There are five basic components that make up the PostgreSQL server (which are listed in the directory on the left side of pgAdmin III, as shown in Figure 4-2): Tablespaces Databases Schemas (listed under each individual database) Group Roles Login Roles Before you dive into managing your PostgreSQL server, you need to be familiar with each of these components This section walks through each of these components, describing how they interact to form the PostgreSQL server
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Tablespaces are the physical locations where objects are stored Objects can be anything from database tables, indexes, functions, and triggers The database cluster area you saw while examining files in 3 is the default location where PostgreSQL creates its tablespaces Remember, by default this location is c:\Program Files\Postgresql\82\data, but you can create the default Data Dictionary in a different location when you install PostgreSQL (described in 2) When you initialized the PostgreSQL system, either when you installed it from the PostgreSQL installer or initialized it using the initdb command, it created two default tablespaces within the database cluster area: pg_default pg_global When you expand the Tablespaces object in the directory on the left side of pgAdmin III, you see both of these tablespaces listed The pg_default tablespace is the default location for all database objects created on the PostgreSQL system When you create new database objects, you should use the pg_default tablespace area to store them You can store as many database objects as you want in a single tablespace (provided you have enough disk space available) The pg_global tablespace is used to hold PostgreSQL system catalogs The system catalogs contain internal Data Dictionary information for the PostgreSQL system to operate You should not create new database objects within this tablespace You can also create new tablespace areas within the PostgreSQL system Often, database administrators create new tablespaces on separate hard disk devices to distribute the database load between disk systems When new database objects are created, you must specify which tablespace area they are stored in It is possible (and sometimes even beneficial) to store different objects within the same database in different tablespaces The pgAdmin III program provides an easy interface for creating new tablespaces Before you can create a new tablespace, though, you must set up its physical location on your system The new tablespace must point to an empty directory on the system If there are any files currently located in the directory, PostgreSQL will refuse to create the tablespace Also, the PostgreSQL system account (called postgres by default) must have permission to write to the directory Remember from 2 that the system account is created as a normal user account for security purposes Most likely you will have to specifically grant the postgres user account access to the directory Unfortunately, Windows XP and Vista Home Editions do not provide a method for you to grant special permissions to directories for user accounts You have to use the location specified during the installation The other Windows operating systems supported by PostgreSQL allow you to use the Security property of a directory to set privileges for users on the directory You can view the Security property of a directory by right-clicking the directory in Windows Explorer, and selecting Properties
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After creating the directory and assigning the postgres account permissions, rightclick the Tablespaces object in pgAdmin III and select New Tablespace from the menu The New Tablespace window appears, providing an interface for you to create the new tablespace In the form, you must specify a name for the new tablespace, the location (directory) where the new tablespace will be located, and the user account that will be the owner of the tablespace After you create the new tablespace, you can use it to store new database objects
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