IBM DB2 Manual page 569

or sorting intermediate results from
queries that contain a large number of
rows. The two types of temporary table,
which are created by different SQL
statements, are the created temporary
table and the declared temporary table.
Contrast with result table. See also created
temporary table and declared temporary
table.
thread See DB2 thread.
threadsafe
A characteristic of code that allows
multithreading both by providing private
storage areas for each thread, and by
properly serializing shared (global)
storage areas.
three-part name
The full name of a table, view, or alias. It
consists of a location name, a schema
name, and an object name, separated by a
period.
time A three-part value that designates a time
of day in hours, minutes, and seconds.
timeout
Abnormal termination of either the DB2
subsystem or of an application because of
the unavailability of resources. Installation
specifications are set to determine both
the amount of time DB2 is to wait for
IRLM services after starting, and the
amount of time IRLM is to wait if a
resource that an application requests is
unavailable. If either of these time
specifications is exceeded, a timeout is
declared.
Time-Sharing Option (TSO)
An option in z/OS that provides
interactive time sharing from remote
terminals.
timestamp
A seven-part value that consists of a date
and time. The timestamp is expressed in
years, months, days, hours, minutes,
seconds, and microseconds.
trace A DB2 facility that provides the ability to
monitor and collect DB2 monitoring,
auditing, performance, accounting,
statistics, and serviceability (global) data.
transaction
|
An atomic series of SQL statements that
|
| make up a logical unit of work. All of the
data modifications made during a
|
| transaction are either committed together
as a unit or rolled back as a unit.
|
transaction lock
A lock that is used to control concurrent
execution of SQL statements.
transaction program name
In SNA LU 6.2 conversations, the name of
the program at the remote logical unit
that is to be the other half of the
conversation.
transition table
A temporary table that contains all the
affected rows of the subject table in their
state before or after the triggering event
occurs. Triggered SQL statements in the
trigger definition can reference the table
of changed rows in the old state or the
new state. Contrast with auxiliary table,
base table, clone table, and materialized
query table.
transition variable
A variable that contains a column value
of the affected row of the subject table in
its state before or after the triggering
event occurs. Triggered SQL statements in
the trigger definition can reference the set
of old values or the set of new values.
tree structure
A data structure that represents entities in
nodes, with a most one parent node for
each node, and with only one root node.
trigger
| A database object that is associated with a
single base table or view and that defines
|
| a rule. The rule consists of a set of SQL
statements that run when an insert,
|
update, or delete database operation
|
| occurs on the associated base table or
view.
|
trigger activation
The process that occurs when the trigger
event that is defined in a trigger
definition is executed. Trigger activation
consists of the evaluation of the triggered
action condition and conditional
execution of the triggered SQL statements.
trigger activation time
An indication in the trigger definition of
whether the trigger should be activated
before or after the triggered event.
553
Glossary