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What was the method in which records are physically stored in a specified order according to a key field in each record ?
A method in which records are physically stored within a specified order according to a key field in every record is hash. (In hash method, a hash function is performed on the key value to determine the unique physical address of the record to store or retrieve)
What is serializability? Explain its types? The data base system must control concurrent implementation of transactions, to ensure that the data base state remains consistent.
What are the key features of Oracle? Key features of Oracle are as follows: • Read Consistency • Concurrency • Locking Mechanisms • Quiesce Database • RAC • Portability
Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
what is natural join?
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
comparison of oracle RDBMS with MySQL
FDs in Relationships: Enrols Relationship: None as it is many to many Teaches Relationship : Course code → Instructor Instructor → Course code The next question is:
examples of fields in a database
What is difference among mysql_connect and mysql_pconnect? Mysql_connect() opens a new connection to the database while mysql_pconnect() opens persistent connection to the data
Database Management Systems 1. Explain SQL Server 2000 Architecture with diagram. 2. Describe Second Normal and Third Normal Form. 3. Explain about query engine and stora
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