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Define Shared locks?
Ans: Shared lock: Throughout concurrent execution of transactions, earlier than a transaction can access a data item, it has to obtain a lock on it. Now here if the transactions just only want to read the data item then each transaction can lock the data item in shared mode, like a lock is termed as shared lock.
prototype of a distributed information system for a national car part retail outlet chain.
crete a data base relationship model Entity: Students; Professors; Dormitories buildings; Attributes of students: Name; Address; Dorm;
How is concurrency identified? Concurrency in objects can be identified by the way they alter their state. Current objects can change their state independently. Aggregation imp
as a customer service employee, explain five measures you would recommend a displeased student to patronise a school canteen
Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
1. Use the Invoice table structure shown below to answer the following questions: a) Draw the dependency diagram and identify the primary key and all dependencies, including al
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
A relation has: Relational Schema Relation instance Relational Schema: A relational schema shows the relation's name, its attributes and the domain of every a
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I want to fragment existing table using java code... help me..!!
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