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Multiple-mode locks: It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that never updates the data values. These transactions can coexist with some other transactions that update the database. In such a condition multiple reads are permitted on a data item, so multiple transactions can lock a data item in the read or shared lock. On the other hand, if a transaction is an updating transaction, i.e., it updates the data items, it has to make sure that no other transaction can access (read or write) those data items that it needs to update. In this situation, the transaction places an exclusive lock on the data items. Therefore, a somewhat higher level of concurrency can be achieved in comparison to the binary locking scheme
What is SQL Server Agent? SQL Server agent plays a significant role in the day-to-day tasks of a database administrator (DBA). It is often overlooked as one of the major tools
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Define the term- Actors and Data Stores Actors: An actor is the active object which drives data flow graph by producing or consuming values. Actors are attached to inputs a
I have to create a database about anything of my choice. It has to contain 4 queries, and 4 forms. It can be anything as simple as a shoe inventory with numbers - is this a service
Demonstrate your knowledge of PL/SQL programming by writing and thoroughly testing triggers and stored procedures associated with an e-commerce application that provides security l
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
Describe the types of Inheritance 1. Single inheritance 2. Multiple inheritance 3. Hierarchical inheritance 4. Multilevel inheritance
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what is the importance of back up files
employee(empid,empname,dept,telno,mobno, add,sssno,tinno,WEdates,WEcomp,WEadd,WEpos,WEres) this is a employee record which is need to be normalize.the WE means work experience
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