If XtraDB would show up in the result of
SHOW ENGINES;
... then it should already be displayed. But if I understand the documentation right, XtraDB is a drop-in-replacement for the InnoDB engine, and it replaces InnoDB, instead of offering a new engine. With the SHOW ENGINES query, you have to watch out in the Comment field of the InnoDB row, to see whether it's InnoDB or XtraDB. Here's my result on a MariaDB 10.0.25 server, copied to clipboard with HeidiSQL's grid export dialog, in Markdown format:
ENGINES
Engine |
Support |
Comment |
Transactions |
XA |
Savepoints |
CSV |
YES |
CSV storage engine |
NO |
NO |
NO |
InnoDB |
DEFAULT |
Percona-XtraDB, Supports transactions, row-level locking, and foreign keys |
YES |
YES |
YES |
MEMORY |
YES |
Hash based, stored in memory, useful for temporary tables |
NO |
NO |
NO |
MyISAM |
YES |
MyISAM storage engine |
NO |
NO |
NO |
MRG_MyISAM |
YES |
Collection of identical MyISAM tables |
NO |
NO |
NO |
PERFORMANCE_SCHEMA |
YES |
Performance Schema |
NO |
NO |
NO |
Aria |
YES |
Crash-safe tables with MyISAM heritage |
NO |
NO |
NO |