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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.
Briefly explain each of the following database terms. Use no more than 2-3 lines for each term. 1. DBMS 2. Update Anomaly 3. Alias (referring to tables in SQL queries)
Read the description below and draw an Entity-Relationship diagram for it. You must use the symbols described in the course materials. This database will help the Parents Assocc
folding method and mid square method using visual basic
INTRODUCTION Databases and database systems have become an essential part of our daily life. We encounter many activities that involve some interaction with a database almost
how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples
Explain the term- signal-to-noise ratio A signal-to-noise ratio of 20 dB means that S/N = 100. As log2101 is around 6.658, the Shannon limit is around 19.975 kbps. The Nyquist
What is a trigger
What is the use of group by clause? Group by clause is used to be relevant aggregate functions to a set of tuples. The attributes given in the group by clause are used to shape
Hierarchical model is also known by? A hierarchical model is also known as a Tree structure.
explain participation constraints with examples
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