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Data Replication
"If a relation R has its copies kept at two or more sites, then it is considered replicated".
But why do we replicate a relation?
There are several advantages and drawbacks of replication of relation
A database is a set of data. But, is the data kept in a database trustworthy? To answer that query we must first answer the question. What is integrity? Integrity simply means t
Benefits: It limits data access. It makes difficult queries look easy. It permits data independence. It presents dissimilar views of the similar data.
Which database object does not physically exist? A view database object does not physically exist.
Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.
Explain sorted File with advantages? Sorted file The sort utility shall perform one of the subsequent functions: 1.Sort lines of all the named files together and write the
Explain the function of input controls. Identify four types of input control and explain the function of each. Provide an example of a data integrity error that could occur i
The Incident table, with an auto-incrementing incident number, etc, looks like: incident_num reporter date time incide
Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod
Determine the Persistent object Persistent object can be stored in one of the following: Files Cheap, permanent, simple storage Low level (Write, Read) Ap
Indexed (Indexed Sequential) File Organisation It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows
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