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Explain Dynamic Two-Phase Locking
Here a transaction locks a data item instantly earlier than any operation is applied on the data item. After finishing all the operations on all the data items, it releases all the locks. An instance of dynamic 2PL is as following
X(X)
Read (X)
X=X+M
Write (X)
X (Y)
Read (Y)
Y=Y+N
Write Y
Unlock (Y)
Unlock (X)
Express the properties of Strings? Strings can be case sensitive (or not) which can change the outcome of string operations. You can evaluate whole strings \ just part
Explain the main advantages of DBMS over File Oriented System ?
How does the system cope up with a record crash when recovery is going on after the first crash? Ans: In a system the undo and redo operations are needed to be idempotent to c
Do NOT use the timestamp type. Use separate date and time data types only. Figure out how to define an SQL insert statement that uses built-in SQL (or MySQL) functions to define
Dirty Reads: T10 reads a value which is updated by T9. This update has not been committed and T9 aborts. T9 T10 Value of x old value = 200
Which is the properties of entities? Attributes is the properties of entities.
explain normalisation
Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp
Explain the concept of Modeling With Objects A model is a conceptual representation of a specification, design or system from a particular point of view. A modelling language
What is DML (Data Manipulation Language)? This language that enable user to access or manipulate data as organised by appropriate data model. Procedural DML or Low level: DM
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