## X 

## XA 

 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. 

## Y 

## young 

 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. 

