History: Percona Server for MySQL

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Tiki can use [https://en.wikipedia.org/wiki/Percona_Server_for_MySQL|Percona Server for MySQL] in two ways:
* As a __database__. This is where your data is stored. The default storage engine is [https://en.wikipedia.org/wiki/InnoDB|InnoDB]. The other database choices are ((MySQL)) and ((MariaDB)).
* As a __search index__. This is a temporary copy of some of your data, optimized for quick retrieval. ~tc~ TODO: check if this is true: The storage engine here is MyISAM. ~/tc~ The index options are explained here: ((Unified Index Comparison))

!! See also
* ((Requirements))
* ((MySQL replication))
* ((MySQL SSL))
* ((Database independence))
* ((dev:MariaDB vs MySQL strategy))
* ((File Storage))
* ((Migrate from MyISAM to InnoDB))