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The postgres program is the database engine part of PostgreSQL The postmaster program spawns multiple copies of the postgres program to handle database queries As seen in 2, when you look at the running processes on your Windows system, you will see one copy of the postmaster program and several copies of the postgres program running It is possible to use the postgres program on the command line as a stand-alone program to query the database, but this is not an easy task With the psql program available, you should never need to use postgres from the command prompt
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You can perform most database operations by interfacing with the procedural language interfaces installed on the PostgreSQL system The psql interface provides a platform for you to use standard SQL commands to do things such as create and delete databases and user accounts However, sometimes it is nice to be able to do some functions directly without having to use the procedural language interface The PostgreSQL SQL wrapper commands allow you to do just that Some basic SQL commands are incorporated into separate Windows commands you can use both at the Windows command prompt and within Windows batch files Table 3-4 describes the SQL wrapper commands that are available for you to use Since all of these commands are duplicated in the graphical pgAdmin III program, they are almost never used in the Windows environment
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Command clusterdb createdb createlang createuser Dropdb droplang reindexdb vacuumdb
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Description Reclusters tables in a database Creates a new database Adds a programming language to a database Creates a new user in the PostgreSQL system Deletes an existing database Removes an existing programming language from a database Rebuilds indexes in the database Removes deleted records from a database, and generates statistics
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Finally, there are two special applications that are included in the PostgreSQL installation These applications help you interface with the PostgreSQL server and provide an easy way for you to administer and use your databases
psql
The psql application provides a command-line interface to the PostgreSQL system From here you can execute standard SQL commands, as well as special psql commands used for querying the database to see what tables, indexes, and other features are available in the database The psql program is examined in detail in 5
pgAdmin III
The pgAdmin III application is a program that provides a fancy graphical interface for administering a PostgreSQL system The pgAdmin III program is a separately developed Open Source application The home page for pgAdmin III is wwwpgadminorg This application allows you to perform any database function from a graphical front end You can add or remove databases, users, tables, and tablespaces easily using the graphical icons The pgAdmin III program also includes a SQL command interface, allowing you to enter SQL queries and view the results It is the Swiss Army knife for PostgreSQL systems 4 covers the pgAdmin III program and how to use it to completely manage your PostgreSQL system
PostgreSQL 8 for Windows
SUMMARY
This chapter covered a lot of ground The PostgreSQL installation includes lots of files and directories to support all of its functions The main PostgreSQL directory is located by default at C:\Program Files\Postgresql Each update release has its own directory under the main directory Within the update release directory, PostgreSQL divides files into several directories The data directory contains the database cluster files and directories necessary for the database engine The data directory also contains the PostgreSQL configuration files The postgresqlconf configuration file defines all of the features available in the PostgreSQL system You can edit this file to fine-tune your PostgreSQL installation The pg_hbaconf configuration file allows you to define which PostgreSQL users can log in from remote workstations, as well as control which databases they have access to The bin directory contains the utilities and programs that you use to interact with PostgreSQL There are several SQL wrapper commands that provide command-prompt programs that implement standard SQL commands This allows you to execute SQL commands without having to use a SQL interface The next chapter discusses the pgAdmin III application, which allows you to perform all of your database administration functions from a graphical interface You will see that you can do all of your administration work from a single interface, making your life much easier
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