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The indices are accumulated in the index files. The data is accumulated in the data files. Indices give fast access to data items. For example, a book database may be managed in the order of Accession number, yet may be indexed on Book titles and Author name.
Data Dictionary: A Data Dictionary kept information about the structure of the database. It is used a lot. Therefore a good data dictionary should have a good design and efficient execution. It is seen that when a program becomes somewhat big in size, keeping track of all the available names that are used and the purpose for which they were used becomes more and more hard. After a significant time if the similar or another programmer has to change the program, it becomes extremely hard.
The problem becomes even more complex when the number of data types that an organisation has in its database enhancing. The data of an organisation is a valuable corporate resource and thus some kind of inventory and catalog of it must be maintained so as to assist in both the management of the resource and utilisation.
It is for this purpose that a data dictionary or directory / dictionary are emerging as a main tool. A dictionary gives definitions of things. A directory notifies you where to find them. A data directory / dictionary have information (or data) about the data.
A comprehensive data dictionary would give the definition of data items, how they adjust into the data structure and how they tell to other entities in the database. In DBMS, the data dictionary kept the information concerning the conceptual, external and internal levels of the databases. It would join the source of each data field value, that is from where the authenticate value is obtained. The audit trail regarding the updates and frequency of its use including user identification with the time of each update is also recorded in Data dictionary.
State your technical objectives for mining the data. Data Understanding. Describe the data For each attribute, give its description and data type. For numeric attributes
What is equi join? Equi Join - It generates all the combinations of tuples from two relations which satisfy a join condition along with only equality comparison (=).
Determine the steps of path in association network You can analyse use of paths in association network in the following steps: Examine every operation and see what asso
Need for Client Server Computing- Client/Server (C/S) architecture includes running the application on multiple machines in which every machine with its component software tackles
Table Handling In RDBMS more than one table can be tackled at a time by using join operation. Join operation is a relational operation that causes 2 tables with a common domai
A Relation Schema represented by R(A1, A2, ..., An) is made up of the relation name the list of attributes and R Ai that it contains. A relation is described as a set of tuples
Which product produces the relation that has attributes of R1 and R2 ? Cartesian product produce the relation which has attributes of R1 and R2
Suppose that in an organisation, an employee may do different roles in dissimilar projects. Say, RAM is doing coding in one project and doing designing in another. Suppose that the
how to implement mid square hashing?
does tables are called relations
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