Who are the users of DBMS?
1. DBMS Developers
2. Application Developers
4. End user
2. Application Developers
4. End user
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A data is known as the rowfact which is stored in computers memory and used by the user as the output
DBMS is an application that is used to manage & maintain Databases. DBMS provides scalability & modifications in Databases & makes them accessible via SQL queries.
dBm is decibel power unit referenced to 1 milliwatt. Look at the related links for conversion: voltage to dBm, dBu, and dBV.
If in the database have more then one records of same type then it is called redundancy.
Hashing is the technique of to retrieving the datas in thedatabase. for example,we created one index for one main table,sohow we can retrieve the index from that main table? ans- to usingone function we can retrieve the data,that function is called hashfunction. hash function format is h(search key)…=pointer or bucket identifier. (MORE)
DataBase Management System (DBMS) is a software package that allows data to be effectively stored, retrieved and manipulated and the data stored in a DBMS packege can be accessed by multiple users and by multiple application programs like (SQL Server, Oracle, Ms-Access) ..
1.DBMS (Data base management system ) is a process of managing data for efficient retrieval and storage of data. 2.The data base which is used by relations( tables) to acquire information retrieval are known as RDBMS. example- sql . Another answer DBMS is the Database Engine itself like …MySql Server RDBMS is a DBMS that is based on the relational model. Almost all modern DBMS's are RDBMS's. Older DBMS's were based on different models (network, hierarchical, etc.) (MORE)
it is the power ratio in decibels No, it isn't. dB on its own is a ratio. But when dB has a suffix, the figure is an absolute measurement, not a ratio. For instance, dBm is a measurement of power compared to 1mW. 0dBm means zero difference between 1mW and the measured figure. In other word…s the measured figure is also 1mW. 3dBm is 3dB greater than 1mW. -3dB is 3dB less than 1mW. etc. Another suffix is W. 0dBW being 1 watt. There are many more suffixes, some of which are used in only a few specialised cases. (MORE)
What is the purpose of dbms? . DBMS is a software that organises the creation, storage and maintenance of Databases for end users.
A join is a temporary relationship that you can create between two tables in a database query that do not already have an established relationship or common field with the same fieldname or data type. Database tables that are joined in a query are related in that query only, and nowhere else. The ty…pe of join that you use indicates which records the query will select or perform the chosen actions on. (MORE)
Can't afford the overhead . Cost of the DBMS . Training Time . Processing Time . When the application is simple . Dealing with a single table. .
A database management system ( DBMS ) is a software package with computer programs that controls the creation, maintenance, and use of a database. It allows organizations to conveniently develop databases for various applications. A database is an integrated collection of data records, files, and …other objects. A DBMS allows different user application programs to concurrently access the same database. DBMSs may use a variety of database models, such as the relational model or object model, to conveniently describe and support applications. It typically supports query languages, which are in fact high-level programming languages, dedicated database languages that considerably simplify writing database application programs. Database languages also simplify the database organization as well as retrieving and presenting information from it. A DBMS provides facilities for controlling data access, enforcing data integrity, managing concurrency control, and recovering the database after failures and restoring it from backup files, as well as maintaining database security. (MORE)
(1) Application Programmers : nApplication programmer is the person who is responsible for implementing the required functionality of database for the end user. Application programmer works according to the specification provided by the system analyst. (2) End Users : nEnd users are those …persons who interact with the application directly. They are responsible to insert, delete and update data in the database. They get information from the system as and when required. There are several categories of end users: n Casual end users occasionally access the database, but they may need different information each time. They use a sophisticated database query language to specify their requests and are typically middle- or high-level managers or other occasional browsers. n Naive or parametric end users make up a sizable portion of database end users. Their main job function revolves around constantly querying and updating the database, using standard types of queries and updates-called canned transactions-that have been carefully programmed and tested. The tasks that such users perform are varied: n Bank tellers check account balances and post withdrawals and deposits. n Reservation clerks fur airlines, hotels, and car rental companies check availability for a given request and make reservations. n Clerks at receiving stations for courier mail enter package identifications via bar codes and descriptive information through buttons to update a central database of received and in-transit packages. (3) Sophisticated end users include engineers, scientists, business analysts, and others who thoroughly familiarize themselves with the facilities of the DBMS so as to implement their applications to meet their complex requirements. (4) Stand-alone users maintain personal databases by using ready-made program packages that provide easy-to-use menu-based or graphics-based interfaces. An example is the user of a tax package that stores a variety of personal financial data for tax purposes. (MORE)
A trigger is a special kind of stored procedures that automaticallyexecutes when an event occurs in the database server. Insert,update and delete are called as events.
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 th…at 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. (MORE)
Generalization defines a is-a-kind of relationship in which one class shares its structure and/or behavior with one or more other classes. The concept of generalization in UML is similar to inheritance in Java. It maps directly to the extends keyword. It is shown by a straight line originating from …the subclass with a hollow arrowhead pointing at the nearest superclass. (MORE)
Minimal Data Redundancy . Consistency of Data . Integration of Data . Sharing of Data . Data independence . Ease of Application Development
o Interest Rate Risk: One way to measure interest rate risk is to measure the volatility of interest rates. The easiest way to do this (though not necessarily the most correct) is to look at the historic volatility of interest rates. A more complex way to do this is to use mathemtical models to fore…cast interest rate scenarios. o Credit Risk: Credit risk is evaluated by credit ratings agencies, the most common being Moody's, Fitch, and Standard and Poors. These agencies assign credit rates to corporations and bonds, helping the investor and lenders understand the implicit risk of the borrower/issuer. o Liquidity Risk: Typically the bid-offer spread (the difference between where you buy and sell a product) is a good indication of liquidity risk. For example, if you can buy a stock at $100 and sell it at $99.95, the bid-offer spread is $0.05, and getting out of the trade is considered relatively easy. However, if you could buy a bond at $100 but sell it at $80, the bid-offer spread is $20, and the bond would be considered illiquid. o Event/Geopolitical Risk: This is a tough one to measure. Increasing global tension is generally reflected in price volatility or a runup in certain types of prices (gold, oil, US Govt bonds), but no one can predict when/where major risk-impacting events will happen. (MORE)
Data base system applications: 1.Universities: For student information, course details, and grades. 2.Airlines: For reservations and schedule information. 3.Credit card transactions: For purchase on credit cards and generations of monthly statements. 4.Human resources: For information about employee…s, salaries, payroll taxes, benefits and for generations of paychecks. 5.Banking: For customer information, accounts, and banking transactions. (MORE)
Row = Record = Tuple Column = Field = Attribute. These words are used interchangebly. Akshay Sahu (MCTS SQL Server 2005)
Anomalies are problems that arise in the data due to a flawin the database design.
In DBMS you can have users who have only select access or with only select+update+insert access or with select+update+insert+delete access. These users may or may not be granted permissions to alter the table schema. Also you can have administrators who can create/modify/delete tables
speed . client server architecture support . easy maintenance and Database Management System DBMS is used to store information in the form of tables columns and rows, interconnected by keys and accessible throughout an interface. Examples: SQL, MYSQL, ORACLE, etc ... Read more: http://wiki.…answers.com/Q/What_is_need_of_dbms#ixzz2MowXopjw (MORE)
Data Security . Data Integrity . Interactive Query . Interactive Data Entry and Updating . Data Independence
when a relationship is optional then the value of the modality is zero. when mandatory then the modality is one.
DBMS stands for D ata B ase M anagement S ystem. So it's role is basically to manage the database. More specifically this software controls the storage, organization, retrieval, integrity and security of the data in the database.
When you create a table or add a field to a table in thegeodatabase, fields are created as a specific data type. Data typesare classifications that identify possible values for andoperations that can be done on the data, as well as the way thedata in that field is stored in the database. When you im…port dataof one type into a field of another data type, you need tounderstand what the equivalent data types are between ArcSDE andyour database management system (DBMS) because it can impact datacontent. Also, when creating new datasets in ArcGIS, it is helpfulto know the equivalent data types between ArcGIS and your DBMS. Forexample, if you add a floating point (float) column to an existingfeature class, that equates to a numeric data type column in a SQLServer database. Well, a DBMS is a database management system. In other words, apiece of software (an engine if you like) that manipulates data ina structured fashion. (MORE)
schedule is an interleaving of action from a set of transactions where the action of any transaction is in the original order.
Basic Characteristics of DBMS â¢ Represents complex relationship between data â¢ Controls data redundancy. â¢ Enforces user defined rules. â¢ Ensures data sharing. â¢ It has automatic and intelligent backup and recovery procedures. â¢ It has central dictionary to store info…rmation. â¢ Pertaining to data and its manipulation. â¢ It has different interfaces via which user can manipulate the data. â¢ Enforces data access authorization. (MORE)
DBMS or database management systems are used to standardize theupdating, maintenance and extraction of data. They make certaintasks routine which allows for simpler programs to access the data.
There are four types of DBMS users, . Naive Users . Online Users . Application Program Users . Database Administrator Note: The description of above points is currently not available.
Atomicity means atomic data can't have multiple value of the samedata type in that column.
Simply stated, that is an acronym for an advanced 'Database Management System', which is a software package that would facilitate the development of various applicable databases. See the related link listed below for more information:
it is occasionally access the data base, but they may need different information each time.They use a sophisticated database query language to specify their request and are typically middle or high-level or other occasional browsers.
A Multi-user DBMS Architecture is one big system of users andqueries. The use of these are to over look and execute plans safelyand does not violate and integrity constraints.
DBMS stands for data base management system. DBMS is a collectionof programs that enables users to create and maintain a database.The DBMS is a general purpose software system used to facilitatethe process of defining, constructing and manipulating data basesfor various applications. features of DBM…S: 1.Data independence 2.Efficient data access 3.Data integrity & security 4.Data administration 5.Reduced application development time (MORE)
A DBMS snapshot in Oracle can also be referred to as a materialized view. Basically a snapshot is a refreshable view that can be refreshed on command or commit.
There are three types of END USERS namely Sophisticated end users- specialised end users- naive user-
class in dbms is nothing but a collection of attributes.... class in java is defined as collection of objects....:D
These are the users who communicate with the database on the daily bases ( at regular period) Their main job is to constantly querying and updating the database using the standard queries.this is called canned transaction. Examples are bank-teller and reservation clerks.
sophisticated end user includes engineers scientist ,business man analyst and others too thoroughly familiarize,themselves with facilities of DBMS so in order to implement their application to meet their complex requirements.
Entitie are the principal data object about which information is to be collected. Entities are usually reognizable concepts,either concrete or abstract, such as: person,university,employees etc.
In DBMS the data is stored in the form of table . Each row in DBMS is known as tuple.
they make up a large section of the end-user population. They use previously well-defined functions in the form of Âcanned transactionsÂ against the database. Examples are bank-tellers or reservation clerks who do this activity for an entire shift of operations
One major problem in databases is concurrency . Concurrency problems arise when multiple processes try to update or insert data into a database table at the same time. Such concurrent updates can cause data to become corrupt. Locking is a strategy that is used to prevent such concurrent updates …to data. When a database system modifies data in one of its tables it first acquires a lock . When a table is locked, only the process the acquired the lock is allowed to modify the data in the table. Other processes will have to wait until the lock is released before they can make their changes. Now, this is a simple representation of how locking works. In reality databases can use different locking strategies. Depending on the database system, locks can be acquired on entire tables (table-level locking) or on individual rows (row-level locking). (MORE)
From Database Systems: Design, Implementation, and Management 10th Ed - Coronel / Morris / Rob - 1.3.1 Role and Advantages of the DBMS: The DBMS serves as the intermediary between the user and the database. The database structure itself is stored as a collection of files, and the only way to acce…ss the data in those files is through the DBMS. Figure 1.2 emphasizes the point that the DBMS presents the end user (or application program) with a single, integrated view of the data in the database. The DBMS receives all application requests and translates them into the complex operations required to fulfill those requests. The DBMS hides much of the database's internal complexity from the application programs and users. The application program might be written by a programmer using a programming language such as Visual Basic.NET, Java, or C#, or it might be created through a DBMS utility program. (MORE)
DBMS is database management system and it stores data that are related. DBMS maintains data security and integrity as well.
DBMS stands for Database management system in short . As the name suggest it stores and manages the data which is related to each other.
Connectivity in database management system is done using is done by making a connection object and using JDBC driver API. For database connectivity ognl.jar should be included in the project.
According to DB Engines regular ranking study, Oracle is the mostpopular DBMS. MySQL comes in second, then MS SQL, then a large gap before therest of the database management systems. db-engines.com/en/ranking