Database Programming

Traditional file processing system lacks from DBMS in many ways . Major Disadvantage of FPS are it do not maintains data security and integrity efficiently.

Computerized payroll systems are much faster and easier compared to the manual processing......

Also quick and accurate answers are produced by the computerized software

What_are_the_primary_role_of_technocrats_and_managers_play_in_actualizing_the_data_processing_need

An entity is something that exists by itself, although it need not be of material existence.

reduce the chance of false identification.----apex

The main difference between ADODC and ADODB is that whereas ADODB is a class library, ADODC is just but a data control. The other difference is that ADODC uses the system resources more compared to the ADODB.

3rd normal form can remove transitive dependencies. for example, group city and group supervisor are depending on a non.key field group number.

with data redundancy there willbe more wastage of memory space as same type of data willbe saved many times

when to want to see the data all duplicate results will come

whatever i cnt b askd, anyway innit

A one-to-many relationship means that one row in one of the tables will relate directly to many rows in the other table.

1. Designing of the database structure. This is by helping in determinig the design of the database information and contents.

2. He/She decide information contents of the database. Deciding the storage structure and acces strategy.

database is the collection of information that store in known procedure

ACID (an acronymn for Atomicity Consistency Isolation Durability) is a concept that Database Professionals generally look for when evaluating databases and application architectures. For a reliable database all this four attributes should be achieved. Atomicity is an all-or-none proposition. Consistency guarantees that a transaction never leaves your database in a half-finished state. Isolation keeps transactions separated from each other until they’re finished. Durability guarantees that the database will keep track of pending changes in such a way that the server can recover from an abnormal termination. Above four rules are very important for any developers dealing with databases. Ref: http://blog.sqlauthority.com/2007/12/09/sql-server-acid-atomicity-consistency-isolation-durability/ - ACID (atomicity, consistency, isolation, and durability) is an acronym and mnemonic device for learning and remembering the four primary attributes ensured to any transaction by a transaction manager (which is also called a transaction monitor). These attributes are: Atomicity. In a transaction involving two or more discrete pieces of information, either all of the pieces are committed or none are. Consistency. A transaction either creates a new and valid state of data, or, if any failure occurs, returns all data to its state before the transaction was started. Isolation. A transaction in process and not yet committed must remain isolated from any other transaction. Durability. Committed data is saved by the system such that, even in the event of a failure and system restart, the data is available in its correct state. The ACID concept is described in ISO/IEC 10026-1:1992 Section 4. Each of these attributes can be measured against a benchmark. In general, however, a transaction manager or monitor is designed to realize the ACID concept. In adistributed system, one way to achieve ACID is to use a two-phase commit(2PC), which ensures that all involved sites must commit to transaction completion or none do, and the transaction is rolled back (see rollback). Ref: http://searchsqlserver.techtarget.com/sDefinition/0,,sid87_gci213756,00.html

magazines

The relationships between database applications DBMS and databases is as follows:

Databases can be simple or complex. simple databases can be kept in a Microsoft Excel spreadsheet or they can be maintained in a user generated Microsoft Access database which can be programmed to query certain data that has been entered into that database over a period of time. Microsoft Excel and Microsoft Access are also applications that are used to build databases that can be incorporated into DBMS or Database Management Systems. These systems can be extremely complex or they can be simple meaning that maintenance to these systems is not demanding. If the DBMS is complex it may require an entire team of technicians and in some cases engineers.The relationship between users, database applications, databases, and Database Management Systems can be simplified even further - Users can access a database that has been created with a database application to query managed data that is a part of a uniform Database management system.

Bottom-up parsing (also known as shift-reduce parsing) is a strategy for analyzing unknown data relationships that attempts to identify the most fundamental units first, and then to infer higher-order structures from them. It attempts to build trees upward toward the start symbol.

Top-down parsing is a strategy of analyzing unknown data relationships by hypothesizing general parse tree structures and then considering whether the known fundamental structures are compatible with the hypothesis.

Data warehouse is the pool of huge amount of data. The data in data ware house can be archived. And when the data is needed you can extract it from the archived files.

Partial Functional Dependency Indicates that if A and B are attributes of a table , B is partially dependent on A if there is some attribute that can be removed from A and yet the dependency still holds. Say for Ex, consider the following functional dependency that exists in the Tbl_Staff table: StaffID,Name -------> BranchID BranchID is functionally dependent on a subset of A (StaffID,Name), namely StaffID. Source :http://www.mahipalreddy.com/dbdesign/dbqa.htm

A Database has three views.

The External Schema: What the end user sees.

The Internal Schema: What the programmers of the program see.

The Conceptual Schema: The basic plan of the database. Most of the time this is in paper form as a Conceptual Schema Diagram (CSD)

Oh, what a lovely thought! Imagine the railways as a beautiful landscape painting. In the center, you have entities like 'Passenger,' 'Train,' and 'Reservation.' Connect them with lines showing relationships, like 'Passenger books Reservation,' and 'Train has Reservation.' Just like painting a happy little tree, let your diagram flow with harmony and clarity. Remember, there are no mistakes, just happy little accidents.

Sequential numbers appear sometimes on channel buoys

Advantages of DBMS (Database Management Systems) are followings:

A true DBMS offers several advantages over file processing. The principal advantages of a DBMS are the followings:

• Flexibility: Because programs and data are independent, programs do not have to be modified when types of unrelated data are added to or deleted from the database, or when physical storage changes.

• Fast response to information requests: Because data are integrated into a single database, complex requests can be handled much more rapidly then if the data were located in separate, non-integrated files. In many businesses, faster response means better customer service.

• Multiple access: Database software allows data to be accessed in a variety of ways (such as through various key fields) and often, by using several programming languages (both 3GL and nonprocedural 4GL programs).

• Lower user training costs: Users often find it easier to learn such systems and training costs may be reduced. Also, the total time taken to process requests may be shorter, which would increase user productivity.

• Less storage: Theoretically, all occurrences of data items need be stored only once, thereby eliminating the storage of redundant data. System developers and database designers often use data normalization to minimize data redundancy. By-bdchanchal@gmail.com

There are various advantages associated with computerization. For example, unlike hard copies, computer files can be backed up at multiple locations.