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*[Priority refill for the buffer pool free list](performance/xtradb_performance_improvements_for_io-bound_highly-concurrent_workloads.md#ps-buffer-pool-free-list-priority-refill)
#### Features Removed from *Percona Server for MySQL* 8.0
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* The TokuDB Storage Engine was [declared as deprecated](https://www.percona.com/doc/percona-server/8.0/release-notes/Percona-Server-8.0.13-3.html) in Percona Server for MySQL 8.0 and will be disabled in upcoming 8.0 versions.
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>We recommend migrating to the MyRocks Storage Engine.
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We recommend migrating to the MyRocks Storage Engine.
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>For more information, see the Percona blog post: [Heads-Up: TokuDB Support Changes and Future Removal from Percona Server for MySQL 8.0](https://www.percona.com/blog/2021/05/21/tokudb-support-changes-and-future-removal-from-percona-server-for-mysql-8-0/).
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For more information, see the Percona blog post: [Heads-Up: TokuDB Support Changes and Future Removal from Percona Server for MySQL 8.0](https://www.percona.com/blog/2021/05/21/tokudb-support-changes-and-future-removal-from-percona-server-for-mysql-8-0/).
Copy file name to clipboardExpand all lines: docs/faq.md
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## Q: Will we have to *GPL* our whole application if we use *Percona Server for MySQL* with *XtraDB*?
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A: This is a common misconception about the *GPL*. We suggest reading the *Free
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Software Foundation* ‘s excellent reference material on the [GPL Version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html), which is the license
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Software Foundation* ‘s excellent reference material on the [GPL Version 2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.html), which is the license
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that applies to *MySQL* and therefore to *Percona Server for MySQL* with *XtraDB*. That
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document contains links to many other documents which should answer your
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questions. *Percona* is unable to give legal advice about the *GPL*.
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# *Percona Server for MySQL* Feature Comparison
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# Percona Server for MySQL Feature Comparison
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*Percona Server for MySQL* is a free, fully compatible, enhanced, and open source drop-in replacement for any MySQL database. It provides superior performance, scalability, and instrumentation.
Copy file name to clipboardExpand all lines: docs/glossary.md
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## ACID
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Set of properties that guarantee database transactions are processed reliably. Stands for [Atomicity](#term-Atomicity), [Consistency](#term-Consistency), [Isolation](#term-Isolation), [Durability](#term-Durability).
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Set of properties that guarantee database transactions are processed reliably. Stands for [Atomicity](#Atomicity), [Consistency](#Consistency), [Isolation](#Isolation), [Durability](#Durability).
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## Atomicity
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## InnoDB
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A [Storage Engine](#term-Storage-Engine) for MySQL and derivatives ([Percona Server](#term-Percona-Server), [MariaDB](#term-MariaDB)) originally written by Innobase Oy, since acquired by Oracle. It provides [ACID](#term-ACID) compliant storage engine with [foreign key](#term-Foreign-Key) support. As of [MySQL](#term-MySQL) version 5.5, InnoDB became the default storage engine on all platforms.
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A [Storage Engine](#Storage-Engine) for MySQL and derivatives ([Percona Server](#Percona-Server), [MariaDB](#MariaDB)) originally written by Innobase Oy, since acquired by Oracle. It provides [ACID](#ACID) compliant storage engine with [foreign key](#Foreign-Key) support. As of [MySQL](#MySQL) version 5.5, InnoDB became the default storage engine on all platforms.
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## Jenkins
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[Jenkins](http://www.jenkins-ci.org) 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:
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[Jenkins](https://www.jenkins-ci.org) 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:
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* no failed tests in the trunk on any platform,
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* aid developers in ensuring merge requests build and test on all platforms,
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* no known performance regressions (without a damn good explanation).
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## LSN
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Log Serial Number. A term used in relation to the [InnoDB](#term-InnoDB) or [XtraDB](#term-XtraDB) storage engines.
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Log Serial Number. A term used in relation to the [InnoDB](#InnoDB) or [XtraDB](#XtraDB) storage engines.
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## MariaDB
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A fork of [MySQL](#term-MySQL) that is maintained primarily by Monty Program AB. It aims to add features, and fix bugs while maintaining 100% backward compatibility with MySQL.
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A fork of [MySQL](#MySQL) that is maintained primarily by Monty Program AB. It aims to add features, and fix bugs while maintaining 100% backward compatibility with MySQL.
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## my.cnf
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The file name of the default MySQL configuration file.
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## MyISAM
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A [MySQL](#term-MySQL)[Storage Engine](#term-Storage-Engine) that was the default until MySQL 5.5.
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A [MySQL](#MySQL)[Storage Engine](#Storage-Engine) that was the default until MySQL 5.5.
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## MySQL
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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](#term-MariaDB) and [Percona Server for MySQL](#term-Percona-Server).
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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](#MariaDB) and [Percona Server for MySQL](#Percona-Server).
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## NUMA
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Non-Uniform Memory Access ([NUMA](http://en.wikipedia.org/wiki/Non-Uniform_Memory_Access)) 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.
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Non-Uniform Memory Access ([NUMA](https://en.wikipedia.org/wiki/Non-Uniform_Memory_Access)) 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.
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## Percona Server for MySQL
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## Storage Engine
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A [Storage Engine](#term-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](#term-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](#term-MyISAM), InnoDB).
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A [Storage Engine](#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](#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](#MyISAM), InnoDB).
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## XtraDB
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Percona’s improved version of [InnoDB](#term-InnoDB) provides performance, features, and reliability above what is shipped by Oracle in InnoDB.
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Percona’s improved version of [InnoDB](#InnoDB) provides performance, features, and reliability above what is shipped by Oracle in InnoDB.
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