U
UCS-2

Universal Character Set, coded in 2 octets, which means that characters are represented in 16-bits per character.

UDF
See [user-defined function]
UDT
See [user-defined type]
unambiguous cursor

A cursor that allows a DBMS to determine whether blocking can be used with the answer set. A cursor that is defined FOR FETCH ONLY or FOR READ ONLY can be used with blocking, whereas a cursor that is defined FOR UPDATE cannot.

uncommitted read (UR)

An isolation level that allows an application to access uncommitted changes of other transactions. The application does not lock other applications out of the row that it is reading, unless the other application attempts to drop or alter the table.

unfenced

Pertaining to a type (characteristic) of a procedure, ...

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