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With the linear commit protocol, sites are connected in a chain, and the subtransaction at the left-hand end of the chain initiates the protocol. Propose a crash recovery protocol for a site in the chain. Consider the following three points at which the crash might occur and state in each case (1) how the site determines from its log that it is at that point and (2) what action it takes (beyond standard recovery processing)
(a) The site crashes before the first message from its left-hand neighbor arrives.
(b) The site crashes after sending the first message to its neighbor on the right, but before receiving a message from its neighbor on the right.
(c) The site crashes after sending a message to its neighbor on the left but before receiving the second message from its neighbor on the left.
Define instance and schema? Instance: Collection of data kept in the data base at a particular moment is known as an Instance of the database. Schema: The o
explain multi key file organisation
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
Describe the storage structure of indexed sequential files and their access method. Ans: Index offers a lookup capability to rapidly reach the vicinity of the desired record.
Project Description: The work is about founding the best skilled person for the job. I will give you the job description. Skills required are Data Entry, Database Administrat
A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation
Advantages And Drawbacks Of Ddbms There are various reasons for building distributed database systems, with sharing of data, reliability and availability, and speedup of query
Describe different steps of the object-oriented design process. The broad steps of the object-oriented design process are: a. Define context and modes of use of the system
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 th
Briefly describe the different kinds of users of a DBMS. Ans: Different sorts of DBMS users are: (a) Software Engineers: These are the people accountable for developing ap
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