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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 query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
What are the four main characteristics of the database approach? The four major characteristics of the database approach are: 1. Self-describing nature of a database system. 2.
Types Of Indexes One of the words used during the file organisation is the term index. In this part, let us describe this term in more detail. We find the index of keywords
3. (10 points) Assume that you have been presented with the following relation for the Baxter Aviation database: Charters (Pilot#, Pilot name, Aircraft ID#, #seats, Village, Fligh
Evaluate, compare and contrast the two methods of relational database design namely top down method and Bottom up method. What will be your choice if you are asked to select a meth
management information system based on functional organisation
why are older data models are being replaced by new data models
I have been given 8 differebt data warehouseing failure case studies. I need to question 4 questions for each
Consider student (std_id, std_name, date_of_birth, phone, dept_name). Put the data for a student with student id200, name arun, birth date 1 February, 1985, phone number (01110 328
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
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