building the data access layer

... Trang 1The Data Link LayerChapter 3 Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow Control Trang 3Functions of the Data Link Layer• ... before and after stuffing. Trang 9Framing (3)Bit stuffing (a) The original data. (b) The data as they appear on the line. (c) The data as they are stored in receiver’s memory after destuffing. Trang ... 39Petri Net Models (2)Trang 40Example Data Link Protocols• HDLC – High-Level Data Link Control • The Data Link Layer in the Internet Trang 41High-Level Data Link ControlFrame format for bit-oriented...

Ngày tải lên: 14/12/2021, 07:14

... on the transactional data access layer (DAL) Module 9 is the second of two modules that focus on the DAL: Module 8, “The Nontransactional Data Access Layer” and Module 9, “The Transactional Data ... transactional DAL then processes the requests by delegating the requests to the data services layer The transactional DAL can return to the business logic layer either success or failure If the transaction ... CRM The first step in the operation of the CRM is the client component’s creation of the CRM Worker The client component then begins using the CRM Worker In the case of the XML CRM Worker, the...

Ngày tải lên: 05/11/2013, 12:15

... on the nontransactional data access layer (DAL) Module 8 is the first of two modules that focus on the DAL: Module 8, “The Nontransactional Data Access Layer” and Module 9, “The Transactional Data ... Introduction to the Data Access Layer The purpose of this section is to introduce students to the DAL and its main purpose, which is to buffer all other layers from the data services layer The section ... Trang 8# Introduction to the Data Access Layer ! The Business Problem ! Splitting the DAL The DAL buffers the entire system from the underlying data services All access to data services for creating,...

Ngày tải lên: 21/12/2013, 06:17

... all of the address data in the Customer table The objects may be retrieved with a composition relationship, but the database itself ignores that and stores the data in a single table The final ... Trang 1Data Access Layer Silverlight and some WPF applications do not use offline storage for persisting data Instead, they use a relational database to store the object data in a structured ... corresponding table The database does not recognize that there is shared data between the different subclasses In Table 8–5, the User abstract class is ignored, and the two tables replicate the Name, EmailAddress,...

Ngày tải lên: 03/10/2013, 01:20

... techniques on data found in the datawarehouse process-Building the Data Warehouse, however, is the cornerstone of all the relatedbooks The data warehouse forms the foundation of all other forms ... Integration 118Triggering the Data Warehouse Record 122 Trang 12Going from the Data Warehouse to the Operational Direct Access of Data Warehouse Data 129Indirect Access of Data Warehouse Data 130 An Airline ... Chapter 10 The Data Warehouse and the Web 297 Supporting the Ebusiness Environment 307Moving Data from the Web to the Data Warehouse 307Moving Data from the Data Warehouse to the Web 308 CO NTE...

Ngày tải lên: 08/08/2014, 21:23

... bymonitoring the data warehouse environment Two operating components are monitored on a regular basis: the data residing in the data warehouse and the usage of the data Monitoring the data in the datawarehouse ... into the data ware-house The act of integrating data is always a complex and tedious task Dataflows from the data warehouse into the departmental/data mart environment.Data in the departmental/data ... source of data (the data warehouse) andbecause the granular data in the data warehouse is easily accessible This chapter will describe some of the more important aspects of the data house A data warehouse...

Ngày tải lên: 08/08/2014, 22:20

... gather information This taskincludes the following: ■■ Finding the data needed for the report ■■ Accessing the data ■■ Integrating the data ■■ Merging the data ■■ Building the report Finding the ... of data into tables for the subject area product 5 - build the report 1 - find the data 2 - access the data 3 - integrate the data 4 - merge the data Trang 7Figure 2.27 Multiple reports make the ... another, such asfrom the operational level to the data warehouse level There are, then, a variety of ways in which data is purged or otherwise formed inside the data warehouse environment The...

Ngày tải lên: 08/08/2014, 22:20

... the granular data found in the data warehouse The data structure found in any given data mart is different from the data structure for any other data mart For example, the ... of data as known to the programmer ■■ Structure of data as known to the DSS analyst ■■ Source data feeding the data warehouse ■■ Transformation of data as it passes into the data warehouse ■■ Data ... movement of data from the data warehouse to the data mart is analogous to the movement of data into the data warehouse from the operational legacy environment Data Marts:...

Ngày tải lên: 08/08/2014, 22:20

... Index/Monitor Data The very essence of the data warehouse is the flexible and unpredictableaccess of data This boils down to the ability to access the data quickly and eas-ily If data in the warehouse ... 4.6 The only real way to determine the proper level of granularity for the lightly summarized data is toput the data in front of the end user Only after the end user has actually seenthe data ... all the levels of granularity a ori, then build the data warehouse Even in the best of circumstances, if 50 per-cent of the design is done correctly, the design is a good one The nature of thedata...

Ngày tải lên: 08/08/2014, 22:20

... corporate integrated data; in other cases, there is very lit-tle The global data warehouse contains historical data, as do the local datawarehouses The source of the data for the local data warehouses ... to the basic structure of data itself, andincludes such things as these: ■■ The structure of data ■■ The encoding of data ■■ The naming conventions used for data ■■ The metrics describing the data, ... which data goes corpora-into the global datawarehouse, the structure of the data, and any conversions that must be done.The mapping is the most important part of the design of the global data...

Ngày tải lên: 08/08/2014, 22:20

... warehouses The corporate data model acts as the glue that holdsthe different local data warehouses together, as far as their intersection at theglobal data warehouse is concerned There may be local data ... option Some of the local data is on one platform, the common data is on another platform,and other local data is on yet another This option is certainly one that is valid, The Distributed Data Warehouse ... the differentgroups for detailed data in the data warehouse The data model forms the basis of the design for the data warehouse ure 6.33 shows that the data model will be broken up into many tables...

Ngày tải lên: 08/08/2014, 22:20

... determin-ing what the best data is In other words, the data architect starts with the datamodel and asks what data is in hand that best fulfills the data requirementsidentified in the data model It ... data greatly diminishes the flexibility of the data warehouse Once the end user has had a chance to look at the data(even just a sample of the data) and give feedback to the data architect, then ... be used effectively in the data warehouseenvironment There are other issues In some cases, the data flowing into the data warehousemust be cleansed In other cases, the data must be summarized...

Ngày tải lên: 08/08/2014, 22:20

... with the volume of data actu-ally in the data warehouse environment The analysis of the volume of data in the data warehouse environment leads directly to the subject of the ularity of data in the ... finely does the partitioning of thedata break the data up?func-ISSUE:Given the volume of data that is inherent to the data warehouseenvironment and the unpredictable usage of the data, it is ... from the data warehouse The data needed tocreate the profile in the class IV ODS is found in the data warehouse 57 What testing facility will there be for the data warehouse? ISSUE:Testing in the...

Ngày tải lên: 08/08/2014, 22:20

... development in the architected environment is the usage ofdata warehouse data for the purpose of analysis Once the data in the datawarehouse environment is populated, usage may commence There are ... with other relevant data IND4—Analyze Data Once data has been selected and prepared, the question is “Do the resultsobtained meet the needs of the analyst?” If the results are not met, another ... design of operational data, to the design of data inthe data warehouse, to the development and design process for operationaldata, and to the development and design process for the data warehouse Fig-ure...

Ngày tải lên: 08/08/2014, 22:20

... Trang 1The Data Link LayerChapter 3 Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow Control Trang 3Functions of the Data Link Layer• ... before and after stuffing Trang 9Framing (3)Bit stuffing (a) The original data (b) The data as they appear on the line (c) The data as they are stored in receiver’s memory after destuffing Trang ... Data Link Protocols• HDLC – High-Level Data Link Control • The Data Link Layer in the Internet Trang 41High-Level Data Link ControlFrame format for bit-oriented protocols Trang 42High-Level Data...

Ngày tải lên: 21/12/2017, 11:48

... 3Functions of the Data Link Layer• Provide service interface to the network layer • Dealing with transmission errors • Regulating data flow SinhVienZone.Com Trang 4Functions of the Data Link Layer (2)Relationship ... stuffing. SinhVienZone.Com Trang 9Framing (3)Bit stuffing (a) The original data. (b) The data as they appear on the line. (c) The data as they are stored in receiver’s memory after destuffing. SinhVienZone.Com ... Trang 1The Data Link LayerChapter 3 SinhVienZone.Com Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow...

Ngày tải lên: 30/01/2020, 23:02

... to the DB2 server and the ability to catalog its databases To create the sample database, click the Create Sample Database link located at the top left of the First Steps dialog This displays the ... DB2 Configuration The DB2 Server Enablement Tool The DB2 Access Server, DB2 Access Views, and Query Views Installing the DB2 Access Server DB2 Access Views Creating the DB2 Access View Definition ... choose another name for the DB2 database the tool creates, if needed The DB2 datastore directory field is an optional field This dialog also allows you to specify whether the default Domino datastore...

Ngày tải lên: 01/06/2014, 01:25

... Restart the node Perform the steps for restoring the cluster disk These steps follow in the next section Note The difference between the time of the backup and the time of the restoration to the ... the newly restored node, you can start the restore process on the other node of the cluster Restoring the Remaining Node(s) of the Cluster The restoration of the second node of a cluster is the ... can move the quorum back to the new disk 8 Module 7: Server Cluster Maintenance and Troubleshooting Restoring the Data on the Cluster Disk Restoring the data on the cluster disk is the same...

Ngày tải lên: 18/01/2014, 05:20

... vector and the Hessian a matrix Show that, for the true parameter value θ◦ , the negative of the expected value of the Hessian equals the variance of the score, i.e., the expected value of the square ... Slutsky theorem: If t is a consistent estimator for θ, and the function g is continuous at the true value of θ, then g(t) is consistent for g(θ) For the proof of the Slutsky theorem remember the ... is to integrate the MSE out over a distribution of the likely values of the parameter This is in the spirit of the Bayesians, although Bayesians would still it differently The other strategy is...

Ngày tải lên: 04/07/2014, 15:20

... when they are =90 mg/dl, the particles are of the large, light variety These changes are potentially atherogenic, as the small, dense and peroxidized LDL are taken up in reduced amount by the ... On the other hand, the reduction in HDL level is associated with decrease of ApoA-I (while ApoA-II is often little changed) and therefore mainly concerns the HDL A-I particles (rather than the ... it hydrolyzes the TG in VLDL, thus releasing FFA The latter are taken up by cells and then re-esterified and stored as TG (in the adipose tissue) or mainly oxidized (in the muscle) The action of...

Ngày tải lên: 09/08/2014, 15:20