a developers guide to data modeling for sql server covering sql server 2005 and 2008 pdf
A Developer''''s Guide to Data Modeling for SQL Server doc
Ngày tải lên :
31/03/2014, 21:22
... hierarchical
identities, and spatial data types. There is also a new file storage data type
that we’ll talk about shortly.
Sql_ variant
A column defined as sql_ variant can store most any data that ... calculating exact times, as
well as durations. Let’s look at each in turn.
Datetime and Smalldatetime
The datetime and smalldatetime data types can store date and time data in
a variety of formats; ... change and new data becomes
available. A sound data model will provide for scaling. This means that
customers can continue to add records to the database, and the model will
not run into problems....
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A Managers Guide to Data warehousing docx
Ngày tải lên :
29/03/2014, 19:20
... Programs
Transformation
Tool
Informatica Informatica SAS Programs
Data Movement Informatica Informatica SAS
Data Cleansing NA NA NA
DBMS Oracle Oracle Essbase
Database Load Oracle Informatica Essbase
End User Data
Access
Business ... MARKETING
TECHNICAL SALES DATA REPORTING CAMPAIGN>
COMPONENT MART SYSTEM MANAGEMENT
Data Modeling
Tool
ER-Win None None
Data Extract
Tool
Informatica Informatica SAS Programs
Transformation
Tool
Informatica ... 231
What Is Information Management? 232
Information Management Example—Customer Data 235
IM Beyond the Data Warehouse 239
Master Data Management 240
Master Data Feeds the Data Warehouse 242
Finding...
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a developers guide to amazon simpledb
Ngày tải lên :
30/05/2014, 22:52
... is a master-slave database replication scheme, where
the master database accepts client updates and a second database acts as a slave and pulls all the
updates from the master.This eliminates ... }
}
The call to the client method domainMetadata() returns a map of metadata entry
names to numeric values.Amazon serves the DomainMetadata operation values from a
cache and not necessarily from a fresh ... Amazon Web Services, Sim-
pleDB can be a strong candidate for queryable data storage across a wide range of
applications. Of course, running a relational database on an EC2 instance is also a...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 1 potx
Ngày tải lên :
18/06/2014, 19:20
... County–Marietta Water Authority for
providing application data, and Bill Sandidge of Instrumentation and Design, Inc.,
for assistance in clarifying some of the issues with software and SCADA integration. ... Counting 63
a. Sample Handling 63
b. Grab Sampling Presents a Partial Picture 64
c. Data Handling 64
3. Benefits of Grab Samplers 64
4. Alternatives to Grab Sampling 65
C. Grab-Sampler Sample Handling ... 167
1. Data Presentation 167
2. Trend Display 168
a. Scaling and Configuration 168
b. Time Period 172
3. Tabular Data Display 176
4. Status Display and Alarms 177
5. Event Log 183
6. Reporting 183
a. ...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 2 potx
Ngày tải lên :
18/06/2014, 19:20
... Packaged Treatment Plants
Packaged treatment plants, as touched on above, are prefabricated plants, which
are more cost-effective than ground-up plants for smaller applications. A packaged
plant ...
Cryptosporidium
and
Giardia
are parasites that live in the intestinal tracts of
cattle and other mammals. They are spread into source waters by runoff from areas
where these animals leave ... plant will produce spikes or other changes in the particle count
data. The operator should be able to look at the particle count trend and trace the
cause of any changes to various plant operations....
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 3 ppt
Ngày tải lên :
18/06/2014, 19:20
... maintenance schedule should account for seasonal changes, and be adjusted
accordingly. Permanganate is often added seasonally, and can cause coating prob-
lems. Any change in the process that can affect ... to plant operation, and to hold them accountable for keeping it up. Most
problems are flow and sample related, and are not complicated. Problems related to
data collection and computer interfacing ... erroneous data, changes in flow that are not
accounted for will create errors due to counting particles over too large or too small
a volume of sample.
Fortunately, flow and flow control are areas with...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 4 pot
Ngày tải lên :
18/06/2014, 19:20
... system, and how to use the data as diagnostic tool and not just a checklist.
We will attempt to provide a framework for developing a useful and practical
approach to particle counting that can be tailored ... second alternative is the direct interface of the particle counters to SCADA
using serial data communications. All count data, as well as status and alarm
information, are transmitted in a specially ... periods, and can be processed
statistically. Chart recordings are frozen in form, and require manual manipulation
for any type of comparison.
3. Historical data can be retrieved and stored easily, backed...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 5 potx
Ngày tải lên :
18/06/2014, 19:20
... PRACTICAL GUIDE TO PARTICLE COUNTING
D. DATA HANDLING
As touched on above, grab-sampler data handling is a cumbersome task. Any
number of approaches are available for organizing grab-sample data, and ... its value. If these data are available in a
usable file format that can be imported into a spreadsheet or database program, the
task is made easier. The more data that are available, the more complete ... to store and display the
data. Paper tape printouts are a nuisance, and most units are designed to off-load
data directly to a personal computer. A good spreadsheet program will be necessary.
Once...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 6 doc
Ngày tải lên :
18/06/2014, 19:20
... the primary specifications employed for evaluating particle
counter performance are defined and discussed. Understanding of these few speci-
fication parameters is essential to making informed decisions ... detected
and measured if it produces a signal with a minimum 2 to 1 signal -to- noise ratio.
B. SIGNAL -TO- NOISE RATIO
All electronic instruments are subject to various forms of “noise,” or random,
meaningless ... mentioned is Section A, the smallest particle that can be reliably measured
must produce a signal amplitude at least twice that of the noise, or a 2 to 1 signal-
to- noise ratio.
C. RESOLUTION
...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 7 potx
Ngày tải lên :
18/06/2014, 19:20
...
82 A PRACTICAL GUIDE TO PARTICLE COUNTING
The cell window materials vary in optical quality. Small imperfections in the
material diffuse the light and are a source of resolution and sizing ... and sizing error. Quartz may
have fewer imperfections as far as optical quality is concerned. It is a softer material
than sapphire, and thus can be bored and polished to create the single window ... reflected back into
the laser, it can disrupt this process, and cause variations in the beam intensity. This
is another reason that aluminum flow cells are anodized a dark color, as the shiny
metallic...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 8 ppt
Ngày tải lên :
18/06/2014, 19:20
... called a voltage comparator
input stage. The more complex approach involves analog -to- digital (A/ D) conversion.
1. Voltage Comparator
A comparator is simply a small circuit that “compares” an ... typically
communicated every minute.
The comparator provides a simple way to convert the particle size information
from an analog pulse to a digital count value. It is a very basic form of analog -to-
digital ... resistance, and a host of other factors limit its acceleration. Electronic
signals are analogous. While they are much, much faster than any car, they cannot
change voltage levels instantaneously. As...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 9 ppt
Ngày tải lên :
18/06/2014, 19:20
... voltage range of a chart recorder or SCADA analog
input is 1 to 5 V. A 250
Ω
resistor is required to convert a 4 to 20 mA signal into a
1 to 5 V signal.
Another benefit of the 4 to 20 mA current ... display of data and alarms. These are
primarily of use during installation and maintenance. The particle counters are
usually mounted down in the filter gallery or in other out of the way places, ... some cases, flow alarms can be signaled by the particle
counter via the computer data collection system.
A. DIAGNOSTIC SIGNALS, ALARMS, AND DISPLAYS
The most common alarm found on particle...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 10 ppt
Ngày tải lên :
18/06/2014, 19:20
... industry standard signal formats (RS-485 and RS-232) and the non-
standard protocols. To make an analogy, the signal format could be compared to
“speaking out loud” and the protocol to the “language” ... Dynamic Data Exchange (DDE)
Dynamic Data Exchange is what the name implies, a constant “exchange” of
data between the particle counter software package and a SCADA software package.
The particle ... in any type of format, referred to as a “protocol.”
These protocols are not standardized, and a lot of effort can be expended in “trans-
lating” the data into usable form. Many laypeople are...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 11 doc
Ngày tải lên :
18/06/2014, 19:20
... of value to retrace the data from several years
back. As storage becomes less and less costly, there is less of a reason to discard
data. If a year’s worth of particle counting data can be stored ... to a gigabyte or more. They are most useful for manual data
backup and transport. Data can be accessed more quickly than from a tape backup,
and these disks can be used as an additional hard-disk ...
Larger plants may want to take advantage of the benefits of networking. Net-
working is becoming more and more inexpensive, and is a good way to share data
for backup and manipulation. The data...
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A Practical Guide to Particle Counting for Drinking Water Treatment - Chapter 12 potx
Ngày tải lên :
18/06/2014, 19:20
... important that data be easily
accessible. File structure should allow data to be imported directly into database or
spreadsheet programs.
The historical data should be available for access via the ... easier for the novice to work within a single program.
d. Historical Data
The system should provide a clean and efficient way to store data. Automatic
archiving and backup are desirable features. ...
126 A PRACTICAL GUIDE TO PARTICLE COUNTING
on the same graph. In this way, various filter effluents can be compared, or auxiliary
data compared with particle count data. It is also useful to have...
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