New functionality
FOREIGN KEY support for all table types, not just InnoDB.
Column-level constraints.
Fail-safe replication.
Online backup with very low performance penalty. The online backup will
make it easy to add a new replication slave without taking down the
master.
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Speed enhancements
New text based table definition file format (.frm files) and a
table cache for table definitions. This will enable us to do faster
queries of table structures and do more efficient foreign key support.
Optimize the BIT type to take 1 bit. (BIT now takes 1 byte;
it is treated as a synonym for TINYINT.)
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Usability enhancements
Add options to the client/server protocol to get progress notes
for long running commands.
Implement RENAME DATABASE. To make this safe for all storage engines,
it should work as follows:
New internal file interface change. This will make all file handling much
more general and make it easier to add extensions like RAID.
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