Atomicity means that database operations are applied following a
“all or nothing” rule. A transaction is either fully applied or not
Consistency means that each transaction that modifies the database
takes it from one consistent state to another.
Once a transaction is committed, it will remain so.
A referential constraint between two tables. Example: A purchase
order in the purchase_orders table must have been made by a customer
that exists in the customers table.
The Isolation requirement means that no transaction can interfere
A Storage Engine for MySQL and derivatives (Percona
Server, MariaDB) originally written by Innobase Oy, since
acquired by Oracle. It provides ACID compliant storage engine
with foreign key support. As of MySQL version 5.5,
InnoDB became the default storage engine on all platforms.
Jenkins is a continuous integration
system that we use to help ensure the continued quality of the
software we produce. It helps us achieve the aims of:
no failed tests in trunk on any platform,
aid developers in ensuring merge requests build and test on all platforms,
no known performance regressions (without a damn good explanation).
Log Serial Number. A term used in relation to the InnoDB or
XtraDB storage engines.
A fork of MySQL that is maintained primarily by Monty
Program AB. It aims to add features, fix bugs while maintaining 100%
backwards compatibility with MySQL.
The file name of the default MySQL configuration file.
An open source database that has spawned several distributions and
forks. MySQL AB was the primary maintainer and distributor until
bought by Sun Microsystems, which was then acquired by Oracle. As
Oracle owns the MySQL trademark, the term MySQL is often used for
the Oracle distribution of MySQL as distinct from the drop-in
replacements such as MariaDB and Percona Server.
Non-Uniform Memory Access (NUMA) is a computer memory design used in multiprocessing, where the memory access time depends on the memory location relative to a processor. Under NUMA, a processor can access its own local memory faster than non-local memory, that is, memory local to another processor or memory shared between processors. The whole system may still operate as one unit, and all memory is basically accessible from everywhere, but at a potentially higher latency and lower performance.
Percona’s branch of MySQL with performance and management improvements.
A Storage Engine is a piece of software that implements the
details of data storage and retrieval for a database system. This
term is primarily used within the MySQL ecosystem due to it
being the first widely used relational database to have an
abstraction layer around storage. It is analogous to a Virtual File
System layer in an Operating System. A VFS layer allows an operating
system to read and write multiple file systems (e.g. FAT, NTFS, XFS,
ext3) and a Storage Engine layer allows a database server to access
tables stored in different engines (e.g. MyISAM, InnoDB).
Percona’s improved version of InnoDB providing performance,
features and reliability above what is shipped by Oracle in InnoDB.
This documentation is developed in Launchpad as part of the Percona Server 5.5.
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