@@ -305,26 +305,27 @@ <h1>Database</h1>
305305 < p > A database is an abstraction on top of an operating system's file system to
306306ease creating, reading, updating, and deleting persistent data. The
307307database storage abstraction most commonly used in Python web development is
308- sets of relational tables.</ p >
309- < div class ="section " id ="relational-databases ">
310- < h2 > Relational Databases</ h2 >
308+ sets of relational tables. Alternative storage abstractions are explained in
309+ the NoSQL section.</ p >
311310< p > Relational databases store all data in a series of tables. Interconnections
312311between the tables are specified as < em > foreign keys</ em > .</ p >
313312< p > Databases storage implementations vary in complexity. SQLite, a database
314- included with Python, creates a single file for all data per database. More
315- complicated databases such as Oracle, PostgreSQL, and MySQL are more tightly
316- coupled with the operating system after installation.</ p >
313+ included with Python, creates a single file for all data per database.
314+ Other databases such as Oracle, PostgreSQL, and MySQL have more complicated
315+ persistence schemes while offering additional advanced features that are
316+ useful for web application data storage.</ p >
317317< p > < a class ="reference external " href ="http://www.postgresql.org/ "> PostgreSQL</ a > and
318318< a class ="reference external " href ="http://www.mysql.com/ "> MySQL</ a > are two of the most common open source
319319databases.</ p >
320320< p > < a class ="reference external " href ="http://www.sqlite.org/ "> SQLite</ a > is a database that is stored in a single
321321file on disk. SQLite is built into Python but is only built for access
322322by a single connection at a time.</ p >
323- </ div >
324323< div class ="section " id ="database-resources ">
325324< h2 > Database resources</ h2 >
326325< p > < a class ="reference external " href ="http://db-engines.com/en/ranking "> DB-Engines</ a > ranks the most popular
327326database management systems.</ p >
327+ < p > < a class ="reference external " href ="http://postgresweekly.com/ "> PostgreSQL Weekly</ a > is a weekly newsletter of
328+ PostgreSQL content from around the web.</ p >
328329</ div >
329330
330331 </ section >
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