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Multiple-mode locks: It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that never updates the data values. These transactions can coexist with some other transactions that update the database. In such a condition multiple reads are permitted on a data item, so multiple transactions can lock a data item in the read or shared lock. On the other hand, if a transaction is an updating transaction, i.e., it updates the data items, it has to make sure that no other transaction can access (read or write) those data items that it needs to update. In this situation, the transaction places an exclusive lock on the data items. Therefore, a somewhat higher level of concurrency can be achieved in comparison to the binary locking scheme
need to get answer for questions 3&4 on this page in part 1
State the definition of association An association is a structural relationship which specifies that objects of one thing are connected with objects of another. In UML, asso
how to data store?
explain various steps uses in evaluation and maintenance of MIS.
What is Nested Queries explain in details? Nested Queries - A SELECT query could have subquery(s) in it. While a SELECT query having another SELECT query in it, is known as n
What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
why are older data models are being replaced by new data models
List the steps for converting state diagram to the code. a) Finding major control path b) Finding the conditional statements c) Finding the loops d) Finding error ro
Ask question #MinimRead Dennis et al. Chapter 6: Minicase 2. Work through it and answer the questions. See the attached example. SequenceDiagram.png Based on the structural mod
What is the full form of ODBC ? ODBC stands for Open Database Connectivity.
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