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1 Chapter 1 : Advanced Database Management System - Tutorials and Notes: Advanced DBMS Topics Advanced Database Management System - Tutorials and Notes Database Management System and Advanced DBMS notes, tutorials, questions, solved exercises, online quizzes for interview, MCQs and much more TOPICS (Click to Navigate). Database machine In the s and s, attempts were made to build database systems with integrated hardware and software. The underlying philosophy was that such integration would provide higher performance at lower cost. In the long term, these efforts were generally unsuccessful because specialized database machines could not keep pace with the rapid development and progress of general-purpose computers. Thus most database systems nowadays are software systems running on general-purpose hardware, using general-purpose computer data storage. However this idea is still pursued for certain applications by some companies like Netezza and Oracle Exadata. Subsequent multi-user versions were tested by customers in and, by which time a standardized query language â SQL[ citation needed ] â had been added. PostgreSQL is often used for global mission critical applications the. In, this project was consolidated into an independent enterprise. Another data model, the entityâ relationship model, emerged in and gained popularity for database design as it emphasized a more familiar description than the earlier relational model. Later on, entityâ relationship constructs were retrofitted as a data modeling construct for the relational model, and the difference between the two have become irrelevant. The new computers empowered their users with spreadsheets like Lotus and database software like dbase. The dbase product was lightweight and easy for any computer user to understand out of the box. The data manipulation is done by dbase instead of by the user, so the user can concentrate on what he is doing, rather than having to mess with the dirty details of opening, reading, and closing files, and managing space allocation. Programmers and designers began to treat the data in their databases as objects. This allows for relations between data to be relations to objects and their attributes and not to individual fields. Object databases and object-relational databases attempt to solve this problem by providing an object-oriented language sometimes as extensions to SQL that programmers can use as alternative to purely relational SQL. On the programming side, libraries known as object-relational mappings ORMs attempt to solve the same problem. XML databases are mostly used in applications where the data is conveniently viewed as a collection of documents, with a structure that can vary from the very flexible to the highly rigid: NoSQL databases are often very fast, do not require fixed table schemas, avoid join operations by storing denormalized data, and are designed to scale horizontally. In recent years, there has been a strong demand for massively distributed databases with high partition tolerance, but according to the CAP theorem it is impossible for a distributed system to simultaneously provide consistency, availability, and partition tolerance guarantees. A distributed system can satisfy any two of these guarantees at the same time, but not all three. For that reason, many NoSQL databases are using what is called eventual consistency to provide both availability and partition tolerance guarantees with a reduced level of data consistency. NewSQL is a class of modern relational databases that aims to provide the same scalable performance of NoSQL systems for online transaction processing read-write workloads while still using SQL and maintaining the ACID guarantees of a traditional database system. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. March Learn how and when to remove this template message Databases are used to support internal operations of organizations and to underpin online interactions with customers and suppliers see Enterprise software. Databases are used to hold administrative information and more specialized data, such as engineering data or economic models. Examples include computerized library systems, flight reservation systems, computerized parts inventory systems, and many content management systems that store websites as collections of webpages in a database. Classification[ edit ] One way to classify databases involves the type of their contents, for example: Another way is by their application area, for example: A third way is by some technical aspect, such as the database structure or interface type. This section lists a few of the adjectives used to characterize different kinds of databases. An in-memory database is a database that primarily resides in main memory, but is typically Page 1
2 backed-up by non-volatile computer data storage. Main memory databases are faster than disk databases, and so are often used where response time is critical, such as in telecommunications network equipment. An active database includes an event-driven architecture which can respond to conditions both inside and outside the database. Possible uses include security monitoring, alerting, statistics gathering and authorization. Many databases provide active database features in the form of database triggers. A cloud database relies on cloud technology. Both the database and most of its DBMS reside remotely, "in the cloud", while its applications are both developed by programmers and later maintained and used by end-users through a web browser and Open APIs. Data warehouses archive data from operational databases and often from external sources such as market research firms. The warehouse becomes the central source of data for use by managers and other end-users who may not have access to operational data. For example, sales data might be aggregated to weekly totals and converted from internal product codes to use UPCs so that they can be compared with ACNielsen data. Some basic and essential components of data warehousing include extracting, analyzing, and mining data, transforming, loading, and managing data so as to make them available for further use. A deductive database combines logic programming with a relational database. A distributed database is one in which both the data and the DBMS span multiple computers. A document-oriented database is designed for storing, retrieving, and managing document-oriented, or semi structured, information. Document-oriented databases are one of the main categories of NoSQL databases. Examples of these are collections of documents, spreadsheets, presentations, multimedia, and other files. Several products exist to support such databases. A federated database system comprises several distinct databases, each with its own DBMS. It is handled as a single database by a federated database management system FDBMS, which transparently integrates multiple autonomous DBMSs, possibly of different types in which case it would also be a heterogeneous database system, and provides them with an integrated conceptual view. Sometimes the term multi-database is used as a synonym to federated database, though it may refer to a less integrated e. In this case, typically middleware is used for distribution, which typically includes an atomic commit protocol ACP, e. A graph database is a kind of NoSQL database that uses graph structures with nodes, edges, and properties to represent and store information. General graph databases that can store any graph are distinct from specialized graph databases such as triplestores and network databases. In a hypertext or hypermedia database, any word or a piece of text representing an object, e. Hypertext databases are particularly useful for organizing large amounts of disparate information. For example, they are useful for organizing online encyclopedias, where users can conveniently jump around the text. The World Wide Web is thus a large distributed hypertext database. Also a collection of data representing problems with their solutions and related experiences. A mobile database can be carried on or synchronized from a mobile computing device. Operational databases store detailed data about the operations of an organization. They typically process relatively high volumes of updates using transactions. A parallel database seeks to improve performance through parallelization for tasks such as loading data, building indexes and evaluating queries. The major parallel DBMS architectures which are induced by the underlying hardware architecture are: Shared memory architecture, where multiple processors share the main memory space, as well as other data storage. Shared disk architecture, where each processing unit typically consisting of multiple processors has its own main memory, but all units share the other storage. Shared nothing architecture, where each processing unit has its own main memory and other storage. Probabilistic databases employ fuzzy logic to draw inferences from imprecise data. Real-time databases process transactions fast enough for the result to come back and be acted on right away. A spatial database can store the data with multidimensional features. The queries on such data include location-based queries, like "Where is the closest hotel in my area? A temporal database has built-in time aspects, for example a temporal data model and a temporal version of SQL. More specifically the temporal aspects usually include valid-time and transaction-time. A terminology-oriented database builds upon an object-oriented database, often customized for a specific field. An unstructured data database is intended to store in a manageable and protected way diverse objects that do not fit naturally and conveniently in common databases. It may include messages, documents, journals, multimedia objects, etc. The name may be misleading since some objects can be highly structured. However, the entire possible object collection does not fit into a predefined structured Page 2
3 framework. Database interaction[ edit ] Database management system[ edit ] Connolly and Begg define Database Management System DBMS as a "software system that enables users to define, create, maintain and control access to the database". Other extensions can indicate some other characteristic, such as DDBMS for a distributed database management systems. The functionality provided by a DBMS can vary enormously. The core functionality is the storage, retrieval and update of data. Codd proposed the following functions and services a fully-fledged general purpose DBMS should provide: Often DBMSs will have configuration parameters that can be statically and dynamically tuned, for example the maximum amount of main memory on a server the database can use. The trend is to minimise the amount of manual configuration, and for cases such as embedded databases the need to target zero-administration is paramount. The large major enterprise DBMSs have tended to increase in size and functionality and can have involved thousands of human years of development effort through their lifetime. The clientâ server architecture was a development where the application resided on a client desktop and the database on a server allowing the processing to be distributed. This evolved into a multitier architecture incorporating application servers and web servers with the end user interface via a web browser with the database only directly connected to the adjacent tier. For example an system performing many of the functions of a general-purpose DBMS such as message insertion, message deletion, attachment handling, blocklist lookup, associating messages an address and so forth however these functions are limited to what is required to handle . Application[ edit ] External interaction with the database will be via an application program that interfaces with the DBMS. Application Program Interface[ edit ] A programmer will code interactions to the database sometimes referred to as a datasource via an application program interface API or via a database language. Database languages[ edit ] Database languages are special-purpose languages, which allow one or more of the following tasks, sometimes distinguished as sublanguages: Data control language DCL â controls access to data; Data definition language DDL â defines data types such as creating, altering, or dropping and the relationships among them; Data manipulation language DML â performs tasks such as inserting, updating, or deleting data occurrences; Data query language DQL â allows searching for information and computing derived information. Database languages are specific to a particular data model. SQL combines the roles of data definition, data manipulation, and query in a single language. It was one of the first commercial languages for the relational model, although it departs in some respects from the relational model as described by Codd for example, the rows and columns of a table can be ordered. The standards have been regularly enhanced since and is supported with varying degrees of conformance by all mainstream commercial relational DBMSs. Page 3
4 Chapter 2 : What is advanced dbms Cookies To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too. Oracle Database Documentation Roadmap About Relational Databases Every organization has information that it must store and manage to meet its requirements. For example, a corporation must collect and maintain human resources records for its employees. This information must be available to those who need it. An information system is a formal system for storing and processing information. An information system could be a set of cardboard boxes containing manila folders along with rules for how to store and retrieve the folders. However, most companies today use a database to automate their information systems. A database is an organized collection of information treated as a unit. The purpose of a database is to collect, store, and retrieve related information for use by database applications. Typically, a DBMS has the following elements: Repository of metadata This repository is usually called a data dictionary. Query language This language enables applications to access the data. A database application is a software program that interacts with a database to access and manipulate data. The first generation of database management systems included the following types: Hierarchical A hierarchical database organizes data in a tree structure. Each parent record has one or more child records, similar to the structure of a file system. Network A network database is similar to a hierarchical database, except records have a many-to-many rather than a one-to-many relationship. The preceding database management systems stored data in rigid, predetermined relationships. Because no data definition language existed, changing the structure of the data was difficult. Also, these systems lacked a simple query language, which hindered application development. Codd defined a relational model based on mathematical set theory. Today, the most widely accepted database model is the relational model. A relational database is a database that conforms to the relational model. The relational model has the following major aspects: Structures Well-defined objects store or access the data of a database. Operations Clearly defined actions enable applications to manipulate the data and structures of a database. Integrity rules Integrity rules govern operations on the data and structures of a database. A relational database stores data in a set of simple relations. A relation is a set of tuples. A tuple is an unordered set of attribute values. A table is a two-dimensional representation of a relation in the form of rows tuples and columns attributes. Each row in a table has the same set of columns. A relational database is a database that stores data in relations tables. For example, a relational database could store information about company employees in an employee table, a department table, and a salary table. Essentially, an RDBMS moves data into a database, stores the data, and retrieves it so that it can be manipulated by applications. Logical operations In this case, an application specifies what content is required. For example, an application requests an employee name or adds an employee record to a table. For example, after an application queries a table, the database may use an index to find the requested rows, read the data into memory, and perform many other steps before returning a result to the user. The RDBMS stores and retrieves data so that physical operations are transparent to database applications. Oracle Database has extended the relational model to an object-relational model, making it possible to store complex business models in a relational database. Brief History of Oracle Database The current version of Oracle Database is the result of over 30 years of innovative development. Highlights in the evolution of Oracle Database include the following: Portable version of Oracle Database Oracle Version 3, released in, was the first relational database to run on mainframes, minicomputers, and PCs. The database was written in C, enabling the database to be ported to multiple platforms. Enhancements to concurrency control, data distribution, and scalability Version 4 introduced multiversion read consistency. Objects and partitioning Oracle8 was released in as the object-relational database, supporting many new data types. Additionally, Oracle8 supported partitioning of large tables. Internet computing Oracle8i Database, released in, provided native support for internet protocols and server-side support for Java. Oracle8i was designed for internet computing, enabling the database to be deployed in a multitier environment. Grid computing Oracle Database 10g introduced grid computing in This release enabled organizations to virtualize computing resources by Page 4
5 building a grid infrastructure based on low-cost commodity servers. A key goal was to make the database self-managing and self-tuning. Manageability, diagnosability, and availability Oracle Database 11g, released in, introduced a host of new features that enable administrators and developers to adapt quickly to changing business requirements. The key to adaptability is simplifying the information infrastructure by consolidating information and using automation wherever possible. In Oracle Database, a database schema is a collection of logical data structures, or schema objects. A database schema is owned by a database user and has the same name as the user name. Schema objects are user-created structures that directly refer to the data in the database. The database supports many types of schema objects, the most important of which are tables and indexes. A schema object is one type of database object. Some database objects, such as profiles and roles, do not reside in schemas. You define a table with a table name, such as employees, and set of columns. In general, you give each column a name, a data type, and a width when you create the table. A table is a set of rows. A column identifies an attribute of the entity described by the table, whereas a row identifies an instance of the entity. For example, attributes of the employees entity correspond to columns for employee ID and last name. A row identifies a specific employee. You can optionally specify rules for each column of a table. These rules are called integrity constraints. This constraint forces the column to contain a value in every row. Chapter 5, "Data Integrity" Indexes An index is an optional data structure that you can create on one or more columns of a table. Indexes can increase the performance of data retrieval. When processing a request, the database can use available indexes to locate the requested rows efficiently. Indexes are useful when applications often query a specific row or range of rows. Indexes are logically and physically independent of the data. Thus, you can drop and create indexes with no effect on the tables or other indexes. All applications continue to function after you drop an index. In contrast to procedural languages such as C, which describe how things should be done, SQL is nonprocedural and describes what should be done. Users specify the result that they want for example, the names of current employees, not how to derive it. All operations on the data in an Oracle database are performed using SQL statements. For example, you use SQL to create tables and query and modify data in tables. A SQL statement can be thought of as a very simple, but powerful, computer program or instruction. Query data Insert, update, and delete rows in a table Create, replace, alter, and drop objects Control access to the database and its objects Guarantee database consistency and integrity SQL unifies the preceding tasks in one consistent language. The principal benefit of server-side programming is that built-in functionality can be deployed anywhere. Oracle Database can also store program units written in Java. A Java stored procedure is a Java method published to SQL and stored in the database for general use. Chapter 8, "Server-Side Programming: Transactions An RDBMS must be able to group SQL statements so that they are either all committed, which means they are applied to the database, or all rolled back, which means they are undone. A transaction is a logical, atomic unit of work that contains one or more SQL statements. An illustration of the need for transactions is a funds transfer from a savings account to a checking account. The transfer consists of the following separate operations: Decrease the savings account. Increase the checking account. Record the transaction in the transaction journal. Oracle Database guarantees that all three operations succeed or fail as a unit. For example, if a hardware failure prevents a statement in the transaction from executing, then the other statements must be rolled back. Transactions are one of the features that sets Oracle Database apart from a file system. If you perform an atomic operation that updates several files, and if the system fails halfway through, then the files will not be consistent. In contrast, a transaction moves an Oracle database from one consistent state to another. The basic principle of a transaction is "all or nothing": Chapter 10, "Transactions" Data Concurrency A requirement of a multiuser RDBMS is the control of concurrency, which is the simultaneous access of the same data by multiple users. Chapter 3 : DBMS Tutorial - Learn DBMS DBMS is a software for manipulating or handling data, database, database users, database environment etc. Advanced DBMS - advanced version of DBMS that start supporting new dimensions of data. Page 5
6 Chapter 4 : Advanced Database Systems - Nabil R. Adam, Bharat K. Bhargava - Google Books management systems. The database management systems are used for recording, storage, The database management systems are used for recording, storage, and management of the data in a database. Chapter 5 : Database - Wikipedia Introduction. Suppose we have to see few of the records that are stored in the database. What do we do? We use SQL language to query the database and retrieve the required data. Chapter 6 : Advanced Database Management System, w/cd The database field has experienced a rapid and incessant growth since the development of relational databases. The progress in database systems and applications has produced a diverse landscape of specialized technology areas that have often become the exclusive domain of research specialists. Chapter 7 : Advanced Database Management System - Tutorials and Notes: Advanced DBMS Concepts 79 videos play all dbms hindi tutorials lectures gate net psu data base management system computer science knowledge gate sanchit jain. Chapter 8 : CMU :: Advanced Database Systems (Spring ) Data Warehousing And Mining, Query Processing and Optimization, Distributed and Parallel Database, Relational Database Design & Normalization, Object Oriented and Object Relational Database, Xml. Chapter 9 : What is a Database Management System (DBMS)? - Definition from Techopedia Database Management System or DBMS in short refers to the technology of storing and retrieving users' data with utmost efficiency along with appropriate security measures. This tutorial explains the basics of DBMS such as its architecture, data models, data schemas, data independence, E-R model. Page 6
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