time in texas now san antonio
The Use of Time in Flash
Ngày tải lên :
20/10/2013, 14:15
... setInterval() action, use the following syntax:
clearInterval(myInterval);
Using the syntax shown, you can initiate the setInterval() action at any time, calling any
function.
< Day ...
following example:
var myInterval:Object = setInterval(rotateClip, 1500);
This example assigns the name myInterval to the setInterval() action. To remove the
functionality of the setInterval() ... the setInterval()
action:
setInterval (updateMessageFunction, 20000, "Hello", arg2, arg3)
A setInterval() action can be turned on and off by assigning a variable name, as in the...
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Tài liệu Managing time in relational databases- P1 ppt
Ngày tải lên :
24/12/2013, 02:16
... datasets are contained
in the single table that is their destination or their point of origin.
In this world, maintaining data is a “submit it and forget it”
activity, not one in which maintenance transactions ... systems used in education,
finance, health care, insurance, manufacturing, retailing and
transportation—all industries in which the authors have had
consulting experience.
In using these methods, ... assertion points in time.
InBase, Inc. has developed software used by many of the
nation’s largest companies, and is known for creating the first
popular mainframe spellchecker, Lingo, early in Randy’s...
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Tài liệu Managing time in relational databases- P2 pptx
Ngày tải lên :
24/12/2013, 02:16
... short of full bi-temporality. For while it acknowl-
edged that one kind of time is a period of time, it believed that the
other kind of time is a point in time. With only one temporal extent
represented, ... management losing
faith in data warehouse projects. As these large projects fell
increasingly behind schedule and rose increasingly over budget—
something large projects tend to do—the pressure increased
to ... updating of warehouses, to real -time transactional
updating.
Data Cubes
The first of these three developments is of minimal interest
because it is pure technology, involving no advance in the
semantics...
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Tài liệu Managing time in relational databases- P3 doc
Ngày tải lên :
24/12/2013, 02:16
... point
in time forward to the point in time we are interested in.
But the defining feature of reconstructable methods is not the
movement of data from off-line to on-line storage. The defining ... any
point in time between the starting balance and the current bal-
ance by going back to the starting balance and applying trans-
actions, in chronological sequence, up to the desired point.
We ... are usually more interested in
what state they are in at a given point in time than in what
changes they have undergone. If we want to know about
changes to the status of an insurance policy,...
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Tài liệu Managing time in relational databases- P4 pptx
Ngày tải lên :
24/12/2013, 02:16
... lacking a standard for the PERIOD datatype, we
will continue the practice of defining periods of time in terms of their begin and end
points in time.
Chapter 3 THE ORIGINS OF ASSERTED VERSIONING: ... record of when business events happen in the real
world. In addition, for most business purposes, we assume that a
SQL timestamp plus a defined interval of time will result in a
second timestamp that ... by also inter-
nalizing them within their target tables. In this book, we will
show how the use of these internalized managed objects reduces
the costs of maintaining databases by replacing external...
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Tài liệu Managing time in relational databases- P5 pptx
Ngày tải lên :
24/12/2013, 02:16
... whether a point
in time is or is not contained in a period of time. Where P and T
are, respectively, a point in time and a period of time, and T
1
and
T
2
are dates delimiting T using the closed-open ... [aligns] with the time period,
then it either [starts] the time period or [finishes] it. Otherwise,
the point in time occurs [during] the time period. If the point
in time [
excludes] the time period, ... clock ticks. This
point in time may either [
intersect] or [exclude] the time period.
If the point in time [
intersects] the time period, it also [fills] and
[
occupies] that time period. If it...
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Tài liệu Managing time in relational databases- P6 pptx
Ngày tải lên :
24/12/2013, 02:16
... point in time
1
All effective time relationships exist within shared assertion time. Because this is so
important to keep in mind, we will often add the qualifier “within shared assertion
time ... Versioning
In this variation on versioning, a logical delete flag is included
in the version table. It has two values, one marking the row as
not being a delete, and the other marking the row as being ... VERSIONING
97
for version tables—a time period which we call assertion time,
and computer scientists call transaction time effective time
versioning adds a single date. Next, instead of adding this...
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Tài liệu Managing time in relational databases- P7 pdf
Ngày tải lên :
24/12/2013, 02:16
... truth.
Temporal Integrity Constraints
The three integrity constraints in relational theory are entity
integrity, referential integrity and domain integrity. Entity integ-
rity insures that the ... effective time than assertion
time, we also present an in- line notation for single asserted
Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00006-6
Copyright
#
2010 Elsevier Inc. ... either
assertion time or effective time on their insert, update or delete
transactions, it will seem to them that they are maintaining data
in a conventional table. This maintenance is not done by writing
SQL...
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Tài liệu Managing time in relational databases- P8 pptx
Ngày tải lên :
24/12/2013, 02:16
... within
shared assertion time, even a single effective -time clock tick
included in another version of that object already in the table.
Most physical transactions against bi-temporal tables are
inserts. ... P861 is not known. But sometimes effective
end dates are known. Perhaps in another insurance company,
all policies stop being in effect at the end of each calendar year.
In that case, instead of ... repre-
sentation of a timeline and a snapshot of effective time periods,
grouped by common assertion times along that timeline. With
the in- line notation, that context, too, is not represented.
Viewing the...
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Tài liệu Managing time in relational databases- P9 pdf
Ngày tải lên :
21/01/2014, 08:20
... against non-temporal
tables insert, update or delete individual rows representing objects,
transactions against asserted version tables insert into a period of
time, update within a period of time, ... SCENARIO 153
PART
3
DESIGNING, MAINTAINING
AND QUERYING ASSERTED
VERSION DATABASES
Chapter Contents
8. Designing and Generating Asserted Versioning Databases 167
9. An Introduction to Temporal ... effective on
that same date.
3
At this point in time,
the episode consi sts of a single version with an effective
time period beginning in January 2010 and extending to
12/31/9999. Because the effective...
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Tài liệu Managing time in relational databases- P10 docx
Ngày tải lên :
21/01/2014, 08:20
... that each business key
points to one and only one object by defining a unique index
on it. Nor can we simply extend the scope of the index by defin-
ing a unique index on the business key plus ... bigint
eff_beg_dt: datetime
asr_beg_dt: datetime
wellpgmcat_oid: bigint
eff_beg_dt: datetime
eff_end_dt: datetime
asr_end_dt: datetime
row_crt_dt: datetime
client_wellpgm_oid: bigint
eff_beg_dt: datetime
asr_beg_dt: ... 3 DESIGNING, MAINTAINING AND QUERYING ASSERTED VERSION DATABASES
In this chapter, we focus on index design, although a wide range
of other optimization techniques are also considered.
In Chapter...
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Tài liệu Managing time in relational databases- P11 doc
Ngày tải lên :
21/01/2014, 08:20
... significantly reduces the work involved in maintaining
temporal data, and will eliminate the errors that would otherwise
inevitably happen as temporal data is maintained.
Using a framework like the ... taxonomy in terms of its topology. On a line representing a
timeline, we can place a line segment representing an episode.
We can also remove a line segment from that line. Given a line
segment, ... continuously
represented, in current assertion time, from the effective -time
beginning of that version’s episode to the effective -time end of
that version. Since the parent managed object in a...
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Tài liệu Managing time in relational databases- P12 pdf
Ngày tải lên :
21/01/2014, 08:20
... effective
time it affects. As a relationship between a point in time and a
period of time, the basic options are that the point in time can
be earlier than the period of time, within the period of time, ... will continue on, and will
update the database. In doing so, it will begin by preserving the
original state of the version or versions about to be changed,
doing this by withdrawing them into past ... 8.
So now, on May 2010, we are claiming that we know several
things about policy P861’s future. We know that it will remain
in effect until December 2010, i.e. through November 30
th
,
2010. We know...
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Tài liệu Managing time in relational databases- P13 pdf
Ngày tải lên :
21/01/2014, 08:20
... always ends the
assertion time period of the version it supercedes, withdrawing
that original version into past assertion time. Consequently,
since temporal integrity constraints apply only among ... 2012, into the indefinite future.
The first physical transaction step in this deletion is to with-
draw versions 9 and 4 since each of them has at least one clock
tick included in the timespan ... or
partially included within its timespan. If one version is partially
within the timespan, the temporal delete will replace the part
of that withdrawn version not within its timespan. In either...
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