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Explain concurrency control?
Concurrency control
Oracles multiversion concurrency control varies from the concurrency mechanism used by some other data base vendors. Read only queries are given a read -consistent snapshot which is view if the data base as it existed at the particular point in time, having all update that we were committed by that point in time and not containing any updates that were not committed at any point in time therefore read clock are not used in read only queries don't interfere with other data base activity in term of locking.
Managed stand by data base
To make sure high availability oracle provide a managed stand by data base future A stand by data base is a copy of the regular data base i.e. in solved on the separate system. If a catastrophic failure occur on the primary system, the stand by system is activate and take over there by minimizing effect on failure on a availability. Oracle keeps the stand by data base up to date by constantly applying archived redo logs that are shipped from the primary data base the back up data base can be brought online in readonly mode and used for reporting and decision support queries
Define Outer join Outer join - If there are any type of values in the one table that do not have corresponding value(s) in the other, in an equi-join which will not be selected
Use of partial data by applications : In common, applications work with views rather than whole relations. Thus, it may be more appropriate to work with subsets of relations rather
ER diagram on cosmetics
Explain the Concept of Two-phase Locking It concerns the positions of locking and unlocking operations in each transaction. In this protocol every transaction issue lock and u
Change the city of First Bank Corporation to ‘New Delhi' UPDATE COMPANY SET CITY = ‘New Delhi' WHERE COMPANY_NAME = ‘First Bank Corporation';
Ask qu. Write a XML with database with book details (Book ID, Title, Author, subject, published year, language, vendor, and price).estion #Minimum 100 words accepted#
a method named WonGame that checks each letter in the word is matched by its label
1. A company wants a report containing a breakdown of payroll by department. Input, which should be stored in 3 parallel arrays, includes each employee's department number, hourly
Cardinality shows the number of instances of an entity associated with another entity participating in a relationship. Depend on the cardinality binary relationship can be further
What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,
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