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Figure 1-3 A simple database engine
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In PostgreSQL, the database engine runs as a service that is always running in the background Users run separate application programs that interface with the database engine while it s running Each application can send queries to the database engine, and process the results returned When the application stops, the PostgreSQL database engine continues to run in the background, waiting for the next application to access it Both Access and PostgreSQL require one or more database files to be present to hold data If you work with Access, no doubt you have seen the mdb database files These files contain the data defined in tables created in the Access database Each database has its own data file Copying a database is as easy as copying the mdb file to another location Things are a little different in PostgreSQL In PostgreSQL the database files are tied into the database engine, and are never handled by users All of the database work is done behind the database engine, so separating data files from the database engine is not recommended To copy a PostgreSQL database, you must perform a special action (called an export) to export the database data to another database This shows a major philosophical difference between Access and PostgreSQL The difference between the two products becomes even more evident when you want to share your data between multiple users In the Access environment, if two or more people want to share a database, the database mdb file must be located on a shared network drive available to all users Each user has a copy of the Access program running on the local workstation, which points to the common database file This is shown in Figure 1-4
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Database Engine MS Access Program User Workstation
Database Engine MS Access Program User Workstation
Database Engine MS Access Program User Workstation
Figure 1-4 A shared Microsoft Access environment
1:
What Is PostgreSQL
Where this model falls apart is how queries or reports are run from the separate workstations Since the Access database engine is part of the Access program, each user is running a separate database engine, pointing to the same data file This can have disastrous effects, especially on the Local Area Network (LAN) Each query and report requires the database engine to search through the database files looking for the appropriate data When this action occurs on a local workstation, it s not too big of a deal When this action occurs across a LAN, large amounts of data are continually passed between the database engine and database files through the network This can quickly clog even the most robust network configurations, especially when ten or more users are actively querying a database, and even more so as Access databases become large (remember, the database engine must check lots of records for the query result, even if the query matches only one record) In the PostgreSQL model, the database engine and database files are always on the same computer Queries and reports are run from a separate application program, which may or may not be located on the same computer as the database engine A multiuser PostgreSQL environment is demonstrated in Figure 1-5 Here, the PostgreSQL database engine accepts data requests from multiple users across the network All of the database access is still performed on the local computer running the PostgreSQL database engine The query and report code transmitted across the LAN is minimal Of course, for large data queries the results sent back across the network can be large, but still not nearly as large as in the Access environment
PostgreSQL Server
Database Files
Database Engine
Local Area Network
Application Program
Application Program
Application Program
Application Program
User Workstation
User Workstation
User Workstation
User Workstation
Figure 1-5 A multiuser PostgreSQL environment
PostgreSQL 8 for Windows
If you are using Access in a multiuser environment, it should be easy to see that Access will not perform as well as PostgreSQL when you get more users You can scale PostgreSQL to however many users you need to support Since PostgreSQL can run on many different platforms, you can even build your database using PostgreSQL on a Windows workstation, then easily migrate it to use PostgreSQL running on a powerful Unix server The PostgreSQL databases will migrate from one server to another with minimal effort This allows you greater flexibility when expanding office applications This feature alone makes PostgreSQL a better database choice in a multiuser database environment However, with its advanced object-relational database features, PostgreSQL can also outperform Microsoft Access even in simple single-user database projects If you are considering a multiuser database application, I would strongly encourage you to give PostgreSQL a try If you are just toying around with a single-user database project, you can still test out PostgreSQL and see if its features can help you out
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