Percona XtraDB Storage Engine for MySQL A storage engine for MySQL based on the InnoDB storage engine, designed to better scale on modern hardware, and including a variety of other features useful in high performance environments. It is fully backwards compatible, and so can be used as a drop-in replacement for standard InnoDB. Percona XtraDB includes all of InnoDB's robust, reliable ACID-compliant design and advanced MVCC architecture, and builds on that solid foundation with more features, more tunability, more metrics, and more scalability. In particular, it is designed to scale better on many cores, to use memory more efficiently, and to be more convenient and useful. The new features are especially designed to alleviate some of InnoDB's limitations. We choose features and fixes based on customer requests and on our best judgment of real-world needs as a high-performance consulting company.
If the MERGE algorithm cannot be used, a temporary table must be used instead. MERGE cannot be used if the view contains any of the following constructs: * Aggregate functions (SUM(), MIN(), MAX(), COUNT(), and so forth) * DISTINCT * GROUP BY * HAVING * LIMIT * UNION or UNION ALL * Subquery in the select list * Refers only to literal values (in this case, there is no underlying table)