Database engine in php

Storage engines (underlying software component) are MySQL components, that can handle the SQL operations for different table types to store and manage information in a database. InnoDB is mostly used general-purpose storage engine and as of MySQL 5.5 and later it is the default engine. There are many storage engines available in MySQL and they are used for different purposes.

Version : MySQL 5.6

Storage engines of MySQL

InnoDBThis is the default storage engine for MySQL 5.5 and higher. It provides transaction-safe (ACID compliant) tables, supports FOREIGN KEY referential-integrity constraints. It supports commit, rollback, and crash-recovery capabilities to protect data. It also support row-level locking. It’s “consistent nonlocking reads” increases performance when used in a multiuser environment. It stores data in clustered indexes which reduces I/O for queries based on primary keys.
MyISAMThis storage engine, manages non transactional tables, provides high-speed storage and retrieval, supports full text searching.
MEMORYProvides in-memory tables, formerly known as HEAP. It sores all data in RAM for faster access than storing data on disks. Useful for quick looks up of reference and other identical data.
MERGEGroups more than one similar MyISAM tables to be treated as a single table, can handle non transactional tables, included by default.
EXAMPLEYou can create tables with this engine, but can not store or fetch data. Purpose of this is to teach developers about how to write a new storage engine.
ARCHIVEUsed to store a large amount of data, does not support indexes.
CSVStores data in Comma Separated Value format in a text file.
BLACKHOLEAccepts data to store but always returns empty.
FEDERATEDStores data in a remote database.


For , List of Storage Engines supported by your MySQL installation, Visit here,

List of Storage Engines supported by your MySQL installation


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