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Displaying posts with tag: mysql storage engine (reset)
Examining the TokuDB MySQL storage engine file structure

As we know different storage engines in MySQL have different file structures. Every table in MySQL 5.6 must have a .frm file in the database directory matching the table name. But where the rest of the data resides depends on the storage engine.

For MyISAM we have .MYI and .MYD files in the database directory (unless special settings are in place); for InnoDB we might have data stored in the single table space (typically ibdata1 in the database directory) or as file per table (or better said file per partition) producing a single file with .ibd extension for each table/partition. TokuDB as of this version (7.1.7) has its own innovative approach to storing the table contents.

I have created the table in the database test having the following structure:

CREATE TABLE `mytable` (
  `id` int(10) unsigned NOT NULL,
  `c` varchar(15) NOT NULL, …
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What is a MySQL storage engine anyway?

"New Shimmer is both a floor wax and a dessert topping!" - Chevy Chase, Saturday Night Live

On a Saturday Night Live comedy skit, a husband is arguing that Shimmer is a dessert topping, while his wife insists that it’s a floor wax. Then the Shimmer spokesman-Chevy Chase-explains that it is both. While this juxtaposition is humorous, in many respects this is what databases have been doing for years. Instead of specializing on one specific task, most mainstream databases provide an acceptable combination of performance and capabilities across all use cases. The pluggable storage engine architecture is now changing this, ushering in an era of on-demand specialization.

MySQL allows you to select the storage engine not just for the application, but for each table used by the application. Let me use an analogy to describe how powerful this is. Consider an automobile that enables you to simply switch from one engine to another. You …

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MySQL Storage Engine based on PHP

Sometimes one has weird ideas, or am I the only one? - This specific one is at least a year old, now, during the Christmas days, waiting for New Year's Eve I had the time and mood to finally try it out: MySQL 5.1 has a plugin interface to easily add storage engines. PHP can easily embedded into other applications.  So why not combine these two things? - Writing a MySQL Storage Engine which reads data by calling a PHP script.

Let's start with a simple example first:

<?phpfunction create_table($table, $data) {
    return true;

function open_table($table) {

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