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Depending upon the rules we have found, we can classify the locks into two types.
Shared Lock: A transaction might be acquiring shared lock on a data item in order to read its content. The lock is shared in the sense that any other transaction can obtain the shared lock on that similar data item for reading purpose.
Exclusive Lock: A transaction might be acquiring exclusive lock on a data item in order to both read/write into it. The lock is excusive in the sense that no other transaction can acquire any type of lock (either shared or exclusive) on that similar data item.
write a short note on participation role? Participation role: roles are indicating in E-R diagram by labelling the lines that connect diamonds to rectangles.
What are the three fundamental operations that are regular to MySQL Programs? a) Establishing a connection to the MySQL server b) Choosing a database. c) Disconnecting fr
what benefit can a company gain by managing its own infrasture and services
What are the two integrity rules? Ans: The two integrity rules are: Entity Integrity Rule & Referential Integrity Rule. Entity Integrity Rule - If the attribute A of rel
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
Hierarchical
Develop a database broker framework to implement a persistence mechanism for the domain objects involved in the use case dealt with in Question 2. a. Specify the attribute type
A file manipulation command that extracts some of the records from a file is called ? A file manipulation command that extracts some of the records from a file is called SELECT
What is Relational DBMS This is our subject of study. A DBMS is relational if the data is organized into relations, that is, tables. In RDBMS, all data are kept in the well-kno
CAR SALE (Car_id, Option_type, Option_listprice, Sale_date, Option_discountedprice) This relation refers to options installed in cars (e.g., cruise control) that were sold at a de
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