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unbuffered option (mysql)
UndoDataBuffer parameter (config.ini file)
UndoIndexBuffer parameter (config.ini file)
unencrypted data
union access algorithm
UNIQUE constraints
unique key access
unique_checks dynamic system variable
unique_subquery joins
Unix
     multiple servers
     Perl, installing
     post-installation setup/testing
         automatically starting/stopping servers
         grant tables
         mysql_install_db script
         servers, starting/shutting down
         troubleshooting starting servers
     startup options
     symbolic links
     Windows, compared
UNKNOWN_EVENT event
unpack option (myisamchk)
UNSET command (mysqlmanager)
unsubscribing, mailing lists
updatable_views_with_limit system variable 2nd
update logs [See extensions, binary logs.]
UPDATE privilege
UPDATE statements
update-state option (myisamchk)
UPDATE_ROWS_EVENT event
updating
     releases
     replication
     tables
     views
upgrades
     5.0
         C API changes
         server changes
         SQL changes
     5.1
     different architectures
     ISAM tables
     MySQL Installation Wizard
     replication
     system tables
     Windows installation
uptime
Uptime status variable
use-frm option (mysqlcheck)
USE_SYMDIR option (configure script)
USER environment variable
user option
     mysql
     mysql_upgrade
     mysqlaccess
     mysqladmin
     mysqlbinlog
     mysqlcheck
     mysqld
     mysqld_multi
     mysqld_safe
     mysqldump
     mysqlhotcopy
     mysqlimport
     mysqlmanager
     mysqlshow
user tables
     columns
     Host/User values
     netmask notation
     sorting
     wildcard characters
user-defined partitions
USER_VAR_EVENT event
usernames
users
     adding 2nd 3rd
     anonymous 2nd
     deleting
     mysqlmanager
     passwords
     privileges
         access control
         administrative
         ALTER
         ALTER ROUTINE
         changes
         checking 2nd
         CREATE
         CREATE ROUTINE
         CREATE TEMPORARY TABLES
         CREATE USER
         CREATE VIEW
         DELETE
         DROP
         enabling/disabling
         EXECUTE
         FILE 2nd
         functionality
         GRANT OPTION
         grant tables
         INDEX
         information locations
         INSERT
         limitations
         LOCK TABLES
         overview
         PROCESS
         REFERENCES
         RELOAD
         REPLICATION CLIENT
         REPLICATION SLAVE
         request verification
         SELECT
         SHOW DATABASES
         SHOW VIEW
         SHUTDOWN
         storing
         SUPER
         UPDATE
     root
utilities [See clients, programs.]