Perl DBI

Along with MySQL's popularity has come a flood of questions about solving specific problems, and that's where this Cookbook is essential. Designed as a handy resource when you need quick solutions or techniques, the book offers dozens of short, focused pieces of code and hundreds of worked-out examples for programmers of all levels who don't have the time (or expertise) to solve MySQL problems from scratch.

The new edition covers MySQL 5.0 and its powerful new features, as well as the older but still widespread MySQL 4.1. One major emphasis of this book is how to use SQL to formulate queries for particular kinds of questions, using the mysql client program included in MySQL distributions. The other major emphasis is how to write programs that interact with the MySQL server through an API. You'll find plenty of examples using several language APIs in multiple scenarios and situations, including the use of Ruby to retrieve and format data. There are also many new examples for using Perl, PHP, Python, and Java as well.

Other recipes in the book teach you to:

• Access data from multiple tables at the same time
• Use SQL to select, sort, and summarize rows
• Find matches or mismatches between rows in two tables
• Determine intervals between dates or times, including age calculations
• Store images into MySQL and retrieve them for display in web pages
• Get LOAD DATA to read your data files properly or find which values in the file are invalid
• Use strict mode to prevent entry of bad data into your database
• Copy a table or a database to another server
• Generate sequence numbers to use as unique row identifiers
• Create database events that execute according to a schedule
• And a lot more

As long as there's been a Web, people have been trying to make it faster. The maturation of the Web has meant more users, more data, more features, and consequently longer waits on the Web. Improved performance has become a critical factor in determining the usability of the Web in general and of individual sites in particular.Web Performance Tuning, 2nd Edition is about getting the best possible performance from the Web. This book isn't just about tuning web server software; it's also about streamlining web content, getting optimal performance from a browser, tuning both client and server hardware, and maximizing the capacity of the network itself.Web Performance Tuning hits the ground running, giving concrete advice for quick results -- the "blunt instruments" for improving crippled performance right away. The book then shifts gears to give a conceptual background of the principles of computing performance. The latter half of the book examines each element of a web transaction -- from client to network to server -- to find the weak links in the chain and show how to strengthen them.In this second edition, the book has been significantly expanded to include:

In addition, the book includes many more examples and graphs of real-world performance problems and their solutions, and has been updated for Java 2.This book is for anyone who has waited too long for a web page to display, or watched the servers they manage slow to a crawl. It's about making the Web more usable for everyone.