X XA Y young  A standard interface for coordinating distributed  transactions , allowing multiple databases to participate in a transaction while maintaining  ACID  compliance. For full details, see Section 13.3.8, “XA Transactions” . XA Distributed Transaction support is enabled by default. See Also ACID, binary log, commit, transaction, two-phase commit.  A characteristic of a  page  in the  InnoDB buffer pool  meaning that it has been accessed recently, and so is moved within the buffer pool data structure, so that it is not  flushed  too soon by the  LRU  algorithm. This term is used in some  INFORMATION_SCHEMA  column names of tables related to the buffer pool. See Also buffer pool, flush, INFORMATION_SCHEMA, LRU, page. 6198