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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.
Explain the function of Object model Object model describes the classes of objects in system, including their attributes and operations which they support. The analysis object
Haw does it work one database application
Define average seek time. The average seek time is the average of the seek times, calculated over a sequence of random requests.
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
Chapter 10a review questions
Explain about database system structure? Storage manager Authorization and integrity manager Transaction manager File manager Buffer manager Storage manager
examples of fields in a database
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
Describe the functions and features of foreign key? Foreign Key : The primary key of one file or table that is implanted in another file or table to implement the relationships
It can be easily defined as: The database must not have any unmatched foreign key values. The term "unmatched foreign key value" means a foreign key value for which there doe
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