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Data Independence
This brings us to our next topic: data independence. It is the property of the database which tries to make sure that if we make any change in any level of schema of the database, the schema instantly above it would need minimal or no need of change.
#question benefits and limitations of data models..
Locks: Serialisabilty is just a test whether a given interleaved schedule is ok or has a concurrency related trouble. Though, it does not make sure that the interleaved concurrent
What do you mean by atomicity and aggregation? Atomicity : Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete trans
Every simple attribute of an entity type have a possible set of values that can be attached to it. This is known as the domain of an attribute. An attribute cannot have a value out
Performance of Various Concurrency Control Mechanisms
what is attribute is attribute inheritance in dbms?
Multilevel Indexing Scheme Consider the indexing scheme where the address of the block is consider in the index for each record, for a little file, this index would be little a
We face problem of stock Opening balance and closing balance in Minus
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Enumerate or state the steps in creating a relevant database of a shop.
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