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Differentiate between B-tree and B+ tree
Ans: A B-tree (or Balanced Tree) is a search tree along with additional constraints that makes sure that the tree is all the time balanced and that the space wasted by deletion, if any, never becomes excessive. In a B-tree, each value of the search field appears just once at some level in the tree, along with a data pointer. In the B+-tree, data pointers are stored just only at the leaf nodes of the tree; hence, the structure of leaf nodes is different from the structure of internal nodes. The leaf nodes of the B+-tree are generally linked together to provide ordered access on the search field to the records. A few search field values from the leaf nodes are repeated in the internal nodes of the B+-tree to guide the search.
What is De-normalization? De-normalization is the method of attempting to optimize the performance of a database by adding redundant data. It is sometimes essential because cur
What is inheritance? Inheritance is an object orientation concept that allows reusability of code / design. Basic sense of inheritance is that if one class is predefined than a
Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
what are the type of the database
What is a data dictionary? A data dictionary is a data structure which keeps Meta data about the structure of the database i.e. the schema of the database.
Transactions And Concurrency Management Introduction One of the main benefits of storing data in an integrated repository or a database is to permit sharing of it betwee
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Benefits: It limits data access. It makes difficult queries look easy. It permits data independence. It presents dissimilar views of the similar data.
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
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