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Depending upon the rules we have found, we can classify the locks into two types.
Shared Lock: A transaction might be acquiring shared lock on a data item in order to read its content. The lock is shared in the sense that any other transaction can obtain the shared lock on that similar data item for reading purpose.
Exclusive Lock: A transaction might be acquiring exclusive lock on a data item in order to both read/write into it. The lock is excusive in the sense that no other transaction can acquire any type of lock (either shared or exclusive) on that similar data item.
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
What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
Let us now make the E-R diagram for the student database as per the explanation given in the previous section. We can also states the overall logical structure of a database usi
What is a trigger
What are the advantages of creating a table from existing table?
A student entity type has the following attributes,name..
a set of possible data value of an attribute is called??
Define the terms 1) physical schema 2) logical schema. Physical schema: The physical schema explains the database design at the physical level, which is the lowest level of abs
Define Specialisation and generalization in brief? Specialisation / generalization: Generalization or Specialization represents the is a relationship set, an necessary element
Define the categories of SQL Statements? 1) Statements that don't return a result set. This statement class includes INSERT, DELETE, and UPDATE. 2)Statements that return
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