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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
what is primary key
Find out the names of all employees who work for first Bank Corporation from database. SELECT EMPLOYEE_NAME FROM WORKS WHERE COMPANYNAME = ‘First Bank Corporation';
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Which component is not included in database environment ? A users component is not included in database environment.
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
Problem 1 Why are the operational system keys not recommended for forming data warehouse primary keys? Give any two examples 2 Explain the following performance tuning techn
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