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FOREIGN KEY support for all table types, not just InnoDB.
Column-level constraints.
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.
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 one bit. (BIT now takes one byte;
it is treated as a synonym for TINYINT.)
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:
Create the new database.
For every table, do a rename of the table to another database, as
we do with the RENAME command.
Drop the old database.
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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