Tag: databases

Questions Related to databases

In Web Farm scenarios, which Encryption provider is suitable for encrypting data in configuration files:
technology databases

  1. DPAPI

  2. RSA

  3. Both

  4. None of the Above

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Correct Option: B

Choose the best statement that best describes the relationship between JSP and servlets

technology databases

  1. Servlets are built on JSP semantics and all servlets are compiled to JSP pages for runtime usage.

  2. JSPs are built on servlet semantics and all JSPs are compiled to servlets for runtime usage.

  3. JSP and servlets are unrelated technologies.

  4. None of the Above

Show answer
Correct Option: B

AI Explanation

To answer this question, you need to understand the relationship between JSP (JavaServer Pages) and servlets.

Option A) Servlets are built on JSP semantics and all servlets are compiled to JSP pages for runtime usage. This option is incorrect because servlets are not built on JSP semantics. Servlets and JSPs are separate technologies and have different semantics.

Option B) JSPs are built on servlet semantics and all JSPs are compiled to servlets for runtime usage. This option is correct. JSPs are built on servlet semantics, meaning that JSPs are translated into servlets before being executed. During runtime, the JSP pages are compiled into servlets by the JSP container, which is then used to process the requests and generate the responses.

Option C) JSP and servlets are unrelated technologies. This option is incorrect. JSP and servlets are related technologies and are often used together in Java web applications. JSPs are a higher-level abstraction that allows developers to embed Java code within HTML-like pages, while servlets are Java classes that handle the processing of HTTP requests and responses.

Option D) None of the Above. This option is incorrect because Option B is the correct answer.

The correct answer is B. JSPs are built on servlet semantics, and all JSPs are compiled to servlets for runtime usage.

Which property of Exception class provides the line number of the code that caused exception:
technology databases

  1. Message

  2. StackTrace

  3. Source

  4. Line number

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Correct Option: B

If a Runtime Exception is thrown in the finalize method
technology databases

  1. The running application crashes`

  2. The exception is simply ignored and the object is garbage collected

  3. The exception is simply ignored, but the object is not garbage collected

  4. If a Runtime Exception is thrown in the finalize method

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Correct Option: B

Choose the correct statement from the given choice?
technology databases

  1. Arrays in Java are essentially objects

  2. It is not possible to assign one array to another. Individual elements of array can however be assigned.

  3. Array elements are indexed from 1 to size of array

  4. If a method tries to access an array element beyond its range, a compile warning is generated.

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Correct Option: A

Which of the following command options of aspnet_regiis is used to encryption config sections?

technology databases

  1. –e

  2. –pe

  3. -enc

  4. All of the Above

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Correct Option: B

Which character is used to continue a statement in SQL*Plus?
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  1. *

  2. /

  3. -

  4. =

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Correct Option: C

Which character function can be used to return a specified portion of a character string?
technology databases

  1. INSTR

  2. SUBSTRING

  3. SUBSTR

  4. POS

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Correct Option: C

The primary key on table EMP is the EMPNO column. Which of the following statements will not use the associated index on EMPNO?
technology databases

  1. select * from EMP where nvl(EMPNO, '00000') = '59384';

  2. select * from EMP where EMPNO = '59384';

  3. select EMPNO, LASTNAME from EMP where EMPNO = '59384';

  4. select 1 from EMP where EMPNO = '59834';

Show answer
Correct Option: A
Explanation:

To solve this question, the user needs to understand the concept of indexes and how they work. An index is a data structure that improves the speed of data retrieval operations on a database table. It is created on one or more columns of a table to allow faster search and retrieval of data based on the values stored in those columns.

Now, let's go through each option and determine whether or not it will use the associated index on EMPNO:

A. select * from EMP where nvl(EMPNO, '00000') = '59384';

This option will not use the associated index on EMPNO. The nvl function in the where clause of this query will cause a full table scan to be performed instead of using the index. This is because the function modifies the column value, making it impossible to use the index for a direct lookup.

B. select * from EMP where EMPNO = '59384';

This option will use the associated index on EMPNO. The query filters on the exact value of EMPNO, which makes it possible to use the index for a direct lookup.

C. select EMPNO, LASTNAME from EMP where EMPNO = '59384';

This option will use the associated index on EMPNO. The query filters on the exact value of EMPNO and only selects the EMPNO and LASTNAME columns, making it possible to use the index for a direct lookup and avoid accessing the table rows.

D. select 1 from EMP where EMPNO = '59834';

This option will use the associated index on EMPNO. The query filters on the exact value of EMPNO, and although it does not retrieve any column values, the index can still be used to perform the lookup and avoid the full table scan.

Therefore, the option that will not use the associated index on EMPNO is:

A. select * from EMP where nvl(EMPNO, '00000') = '59384';

The Answer is: A

In which one of the following scenairos the IMS status code AM will be issued
technology databases

  1. The DLI call did specify a segment I/O area

  2. The function code field specified for the DLI call contains an incorrect value

  3. The DLI call attempted to perform an operation which is not authorised by processing option specified in the PCB

  4. The DLI call specifies an invalid SSA.

Show answer
Correct Option: C