Read e-book online MySQL High Availability: Tools for Building Robust Data PDF

By Charles Bell, Mats Kindahl, Lars Thalmann

ISBN-10: 1449339557

ISBN-13: 9781449339555

Server bottlenecks and screw ups are a truth of existence in any database deployment, yet they don’t need to carry every thing to a halt. This functional e-book explains replication, cluster, and tracking gains that could aid shield your MySQL process from outages, no matter if it’s operating on undefined, digital machines, or within the cloud.

Written by means of engineers who designed a few of the instruments lined, this publication unearths undocumented or hard-to-find points of MySQL reliability and excessive availability—knowledge that’s crucial for any association utilizing this database procedure. This moment variation describes huge adjustments to MySQL instruments. models as much as 5.5 are lined, besides numerous 5.6 features.

* research replication basics, together with use of the binary log and MySQL Replicant Library
* deal with failing parts via redundancy
* Scale out to control read-load raises, and use information sharding to deal with huge databases and write-load increases
* shop and reflect facts on person nodes with MySQL Cluster
* visual display unit database job and function, and significant working procedure parameters
* hold song of masters and slaves, and take care of mess ups and restarts, corruption, and different incidents
* learn instruments together with MySQL firm video display, MySQL Utilities, and GTIDs

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Read Online or Download MySQL High Availability: Tools for Building Robust Data Centers (2nd Edition) PDF

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The get method sends the submitted data to the receiving page as a series of name-value pairs appended to the URL. com/script. php? An HTML form is created using the form tags and various elements for taking input. The form tags look like Creating an HTML Form Choosing a Method In terms of PHP, the most important attribute of your form tag is action, which dictates to which page the form data will be sent. The second attribute—method—has its own issues (see the “Choosing a Method” sidebar), but post is the value you’ll use most frequently.

17). The last step in the script is to print out the results. To use a combination of HTML, printed dollar signs, and variables, the echo() statement uses both singlequoted text and concatenated variables. You could also put this all within a double-quoted string (as in previous examples), but when PHP encounters, for example, at a cost of $$price in the echo() statement, the double dollar sign would cause problems. You’ll see an alternative solution in the last example of this chapter. Chapter 1 Introducing Numbers ✔ Tips ■ PHP supports a maximum integer of around two billion on most platforms.

This variable stores the full path and name of the script being run (for example, What Are Variables? php). The value stored in $_SERVER[‘SCRIPT_ FILENAME’] will be assigned to the new variable $file. Creating new variables with shorter names and then assigning them values from $_SERVER will make it easier to refer to the variables when printing them. ) 4. Create a shorthand version of the other two variables. $user = $_SERVER[‘HTTP_USER_AGENT’]; $server = $_SERVER[‘SERVER_ ➝ SOFTWARE’]; represents the Web browser and operating system of the user accessing the script.

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