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Atomicity: Either all functions are laid out or none are. Users could not have to think about the effect of incomplete operations. DBMS ensures this by undoing the functions of incomplete operations.
Aggregation: A concept which is needed to model a relationship between relationships and a collection of entities. It is used when we require express a relationship among relationships.
Name the three major groups of files on disk that devolve a database in Oracle There are three major groups of files on disk that devolve a database.
The most important of these are the database folders where the actual data insides. The control files and the redo logs support the properties of the architecture itself. All three groups of files must be open, present, and available to Oracle for any data on the database to be utilized. Without these files, you cannot operate the database, and the database administrator has to answer some or the entire database needs a backup, if there is one.
Given the following relations TRAIN (NAME, START, DEST) TICKET (PNRNO., START, DEST, FARE) PASSENGER (NAME, ADDRESS, PNRNO.) Write SQL expressions for the following queries: No
Define a table in SQL known as Client that is used to store information about the clients. Define CLIENT_NO as the primary key whose first letter must begin with ‘C'. Also ensure t
Identification of concurrency Identification of concurrency: Dynamic model identifies concurrency. Two objects are said to be parallel (concurrent) if they can receive events a
Show a centralised schema to support the operation of the system you have chosen, including in particular: the product catalogue; the outlets and respective stocks; customer record
Find the names of all Albums that have more than 30 tracks. Result: (name: varchar(255))
What is a view? How it is related to data independence? A view might be thought of as a virtual table, that is, a table that does not really exist in its own right but is inste
How to create values of structured type? Constructor functions are used to make values of structured types. A function with the similar name as a structured type is a construct
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
This language that enable user manipulate to or access data as organized by appropriate data model. Low level or Procedural DML : DML needs a user to specify what data ar
Create centralized relational database using bottom up method. (a) Recognize a single un-normalized relation for the above scenario. (b) Recognize the primary key for
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