Aria (storage engine)
|Developer(s)||Monty Program Ab|
|Stable release||MariaDB 5.2.4 / December 6, 2010|
Aria is a storage engine for the MariaDB and MySQL relational database management systems. Its goal is to make a crash-safe alternative to MyISAM. It is not yet transactional but plans to add proper support for database transactions at some point in the future. The long-term goal is for Aria to be the default transactional and non-transactional storage engine for MariaDB. It has been in development since 2007 and was first announced by Michael "Monty" Widenius on his blog. Aria is used for internal temporary tables in MariaDB, a community-developed branch of the MySQL database led by Widenius. Aria is not shipped with MySQL or Percona Server, but is included in the Tokutek release of MariaDB.
The Maria project is hosted on Launchpad.
Aria is very similar to MyISAM, but its purpose is to be a crash-safe alternative to MyISAM.
Aria does not support foreign keys and, currently, transactions.
Non-partitioned Aria tables consist of three physical files:
The .frm file contains the table definition (this file exists for all storage engines which write data to disk). The .MAD file contains the data. The .MAI file contains the indexes.
Three table formats are available for Aria tables:
PAGE is the only format available for transactional tables.
FIXED and DYNAMIC are the same formats used by MyISAM, and have been mainly implemented for compatibility. Howevwer, MyISAM's COMPRESSED format is not available in Aria.
In order to set the table format, one can use the ROW_FORMAT option in a CREATE TABLE or ALTER TABLE command.
- Official website
- The Maria engine is released - written by Michael Widenius (founder of MySQL AB)
- Maria: The new MySQL Storage Engine at Google Videos (Adobe Flash video) - A talk given by Michael Widenius
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