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Define object-relational systems?
Systems that give object-oriented extensions to relational systems are known as object-relational systems.
a set of possible data value of an attribute is called??
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
System level permissions : With the use of data dictionary you can view them. Let us take the table name as user_sys_privs (used in oracle). DESCRIBE USER_SYS_PRI
Define average latency time. The average latency time of the disk is one-half the time for a full rotation of the disk.
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
how many hourse have been spent on a certain project
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Rules Of Data Normalisation Let us now summarise Normalisation with the help of various clean rules. The following are the necessary rules for the Normalisation process: 1.
A file of employee have 10,000 blocks on a cylinder of a disk with characteristics r=8ms and btt=0.6ms I want to know the cost of read inthe file under following conditions for a q
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