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What is indexed sequential file organization? What are the applications of this organization?
Ans: An index file can be employed to effectively overcome the problem of storing and to speed up the key search also. The very simple indexing structure is the single-level one: a file whose records are pair's key-pointer, in which the pointer is the position in the data file of the record along with the given key. Just only a subset of data records, consistently spaced along the data file, are indexed, thus to mark intervals of data records.
A key search after that proceeds as follows: the search key is compared with the index ones to find out the highest index key preceding the search one, and a linear search is carried out from the record the index key points onward, till the search key is matched or until the record pointed by the next index entry is reached. In place of the double file access (index + data) needed by this type of search, the decrease in access time along with respect to a sequential file is important.
Consider employee (e_no, e_name, e_salary, d_code), dept (d_code, d_name) and dependent (depndt_name, e_no, relation). Show the names of employees in purchase and accounts departm
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construct an er diagram for a hospital with a set of patients and a set of medical doctors. associate with each patient a log of various test and examination conducted.convert er d
Indexed (Indexed Sequential) File Organisation It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows
What is Distributed system ? Distributed System - A distributed system consists of a number of processing parts in which are interconnected through a computer network and in
I just purchased a document for you guys and wanted to confirm that it will be send within an hour or 2 to my email or where will document be sent to?
What is a Name? A user-supplied name is used for identity. This form of identity is used for files in file systems. The user gives every file a name that uniquely identifies it
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
give some example real-life situations where DBMS are most suiitabe
What is data definition language? Explain it in detail? The SQL DDL allows specification of not only a set of relations, but also information after each relation, containing
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