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If you chose to run PostgreSQL as a background service, it should now be running on your system You can use the Windows Task Manager to check for yourself The Task Manager allows you to see what services are currently running on your system You must be logged in with a user account that has administrator privileges to see system services The easiest way to start the Task Manager is to right-click on an empty place on the system taskbar and select Task Manager from the menu that appears Figure 2-8 shows the Task Manager in action
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Figure 2-8 Windows Task Manager
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In the Task Manager window, click the Processes tab This shows a list of all the services running on the system You can click the Image Name column heading to sort the processes by their names If you scroll down to the P section, you should see several processes related to PostgreSQL The main PostgreSQL process is called postmaster This process controls the PostgreSQL system and database engine You should also see several other postgres processes, which handle queries to the database engine These processes control connectivity to the PostgreSQL system The number of postgres processes created is controlled by an entry in the PostgreSQL configuration file (discussed in 3)
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If you do not want the PostgreSQL system running all the time on your Windows system, you have to manually create the default database, and start and stop the program This is done using a couple of the programs included with PostgreSQL To be able to start PostgreSQL, it must have the Data Dictionary area created To manually create this, you must use the initdb program The initdb program uses command-line parameters to define where the Data Dictionary should be created, and what type of encoding to use:
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initdb -D datapath -E encoding
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By default, the Data Dictionary is located in the data directory within the PostgreSQL installation directory The datapath must exist, and the user account used to run PostgreSQL must have write access to it The initdb program must be run by the Windows user account that controls PostgreSQL This cannot be a user account with administrator privileges To run the initdb program as the user account, you can either log in using that account or use the Windows runas command to start the program as the user The easiest way to do this is to start a command-prompt session as the PostgreSQL user account:
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runas /user:postgres cmd
After prompting you for the postgres password, Windows starts a commandprompt session as that user By default, the initdb program is located in the PostgreSQL bin directory You can change to that directory and run the program as follows:
cd \program files\postgresql\82\bin initdb -D "c:\program files\postgresql\82\data"
Note that you must enclose the datapath value in double quotes if it includes spaces After the Data Dictionary is created, you can start PostgreSQL This is done using the pg_ctl program Again, to run the pg_ctl program you must be logged in as a nonadministrator user account, or use the runas command as you did with the initdb program
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There are several functions you can perform with the pg_ctl program The format of the pg_ctl command for controlling the PostgreSQL server is
pg_ctl command -D datadir
The command parameter can be one of five basic options: start, stop, restart, reload, and status The datadir parameter points to the location of the Data Dictionary If the pathname includes spaces (such as in the default directory location) you must enclose the pathname in double quotes Thus, to start PostgreSQL using the default Data Directory location, you would use the following command:
pg_ctl start -D "c:\program files\postgresql\82\data"
Remember, you cannot start the PostgreSQL server from a user account that has administrator privileges If the PostgreSQL server starts, you will be able to see the postmaster and postgres processes running in the Task Manager
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