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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
Surgeons identified by doctor ID (DOCID) operate on patients identified by patient ID (PATID) in operating theaters identified by room numbers (ROOMNO). Each surgeon can operate on
What are data models? Explain it detail? Entity relationship model Rectangles Ellipse Diamonds Lines Relational model Relational model use a collection
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
WOUND-WAIT
Synonyms and Indexes Some of the essential properties of indexes are: An Index is a schema Object Indexes can be formed explicitly or automatically Indexes are m
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
differences between a classified catalog and a dictionary catalog
Hashed File Organisation Hashing is the most common form of purely random access to a database or file. It is also used to access columns that do not have an index as an optimi
Information about films holds information about movies, stars and studios. Movies have a title, year of production, length and the film type. Stars have a name and address. Studi
Describe the storage structure of indexed sequential files and their access method. Ans: Storage structure of Indexed Sequential files and their access: To achieve fast rand
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