U

Index

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UDT (user-defined data type)
unallocated_extent_page_count column
Uncommitted Read isolation 2nd
undo recovery phase
Unicode characters (nchar and nvarchar)
uniform extents
UNIQUE constraint 2nd
uniqueidentifier data type
uniqueifiers
universal unique identifier (UUID)
unused virtual log files (VLFs)
update locks 2nd
updating index rows
     forward pointers
     in-place row updates
     moving rows
     not in-place row updates
     overview
UPDLOCK keyword
Upgrade Advisor
upgrade blockers
upgrades [See also installations]
     benefits
     changing database compatibility level
     compared to migrations
    components [See components]
     drawbacks
     internals
     post-upgrade operations
     steps for
     Surface Area Configuration Tool
     updating statistics
User configuration options
User Connections configuration option 2nd
User Instance Timeout configuration option
User Instances Enabled configuration option
user objects in tempdb database
user vs. principal
user-defined data type (UDT)
user-defined filegroups
user_object_reserved_page_count column
UUID (universal unique identifier)