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The lowest level operator to access data in query processing is _______

The lowest level operator to access data in query processing is _______ Correct Answer File scan

The lowest level operator to access data in query processing is file scan. File scans are algorithms that locate and retrieve records that fulfill a selection criterion.

Related Questions

Consider the following statements
1. In the first level of information processing, an internal representation of an object is formed
2. In the second level of information processing identification and recognition is carried out
3. In the first level of information processing identification and recognition is carried out
4. In the second level of information processing internal representation is formed
Select the correct answer from the options given below:
Point out the correct statement. * executes a Hive query and prints results to standard output b) executes a Hive query and prints results to standard output c) executes a Hive query and prints results to standard output d) All of the mentioned
In query processing, the ___________ is the lowest-level operator to access data.
Which of the following statements are true?
Statement I Big data refers to no precise quantity, but generally refers to data in the range of Petabytes and Exabyte, i.e. billions to trillions of records, all from various sources. Big data is generated much faster. than traditional data in much larger quantities.
Statement II Big data interests industries because they are able to learn more patterns and curious variances than smaller data sets, with the capability to provide valuable insights into consumer behaviour, weather systems, financial market activity, or other phenomena.
Statement III Various departments and product lines use various applications within most organisations and store data in separate datasets. These separate databases may contain similar data, but data from one data base to another is not always consistent. This is called data silo.
Consider the following two tables and four queries in SQL. Book (isbn, bname), Stock (isbn, copies) Query 1: SELECT B.isbn, S.copies FROM Book B INNER JOIN Stock S ON B.isbn = S.isbn;   Query 2: SELECT B.isbn, S.copies FROM Book B LEFT OUTER JOIN Stock S ON B.isbn = S.isbn; Query 3: SELECT B.isbn, S.copies FROM Book B RIGHT OUTER JOIN Stock S ON B.isbn = S.isbn;   Query 4: SELECT B.isbn, S.copies FROM Book B FULL OUTER JOIN Stock S ON B.isbn = S.isbn;   Which one of the queries above is certain to have an output that is a superset of the outputs of the other three queries?
A company paid Rs. 6,00,000 as bonus to its employees at different levels A, B and C. Each employee at level A receives one and half times of the amount that was paid to each employee at level B and each employee at level B was paid twice the amount paid to the employee at level C. If 50 employees were on level A, 75 on level B and 100 on level C, how much amount was paid to each employee of level A ?
Consider a system with 2 level caches. Access times of Level 1 cache, Level 2 cache, and main memory are 1 ns, 10 ns, and 500 ns, respectively. The hit rates of Level 1 and Level 2 caches are 0.8 and 0.9, respectively. What is the average access time of the system ignoring the search time within the cache? 
Given the steps of information system
1. Data processing
2. Transaction processing
3. Application processing
4. Information system processing
Which is the correct sequence of information system's steps
Jio is a big shot at reducing the cost of Internet access in India. The U.S., despite being the richest country in the world, lags far behind in terms of cost and penetration of Internet access. Cheap access to the Internet is an important step in bridging the access gap – access to good education, good healthcare, etc. But the market reaction to Jio is similar to the U.S. markets reaction to firms announcing their intention to diversify. (A)The final group of losers is the current shareholders of RIL. On announcement of Jio, the stock price of RIL fell. (B) It shows that the markets short-term reaction is usually proven correct in the long-run. (C) On losing end, the first groups of losers are the shareholders of other telecom companies. (D)The large amount of revenue the Government of India gets from auctioning off the nations natural resources is not necessarily a good thing because the Government does not have a stellar track record when it comes to spending the money. A large fraction of Government spending is wasted. (E) The second loser is the Government of India. The big money the Indian Government was raking in selling cellular bandwidth was actually coming from the pockets of the cellular consumers. (F)The first obvious winners of this scheme are customers. (G) The second winner is Mr. Ambani; he can potentially make a lasting impact as the man who brought Internet to millions of Indians. Question: Which of the following supports the decision of other companies opposing Reliance JIO Scheme?
You develop an enterprise application, called XYZApplication that includes a Windows Form presentation layer, middle-tier components for business logic and data access, and a Microsoft SQL Server database.
You are in the process of creating a middle-tier component that will execute the data access routines in your application. When data is passed to this component, the component will call several SQL Server stored procedures to perform database updates. All of these procedure calls run under the control of a single transaction.
The code for the middle-tier component will implement the following objects:
SqlConnection cn = new SqlConnection();
SqlTransaction tr;
If two users try to update the same data concurrently, inconsistencies such as phantom reads will occur. You must now add code to your component to specify the highest possible level of protection against such inconsistencies.
Which code segment should you use?