Tag: databases
Questions Related to databases
In Web Farm scenarios, which Encryption provider is suitable for encrypting data in configuration files:
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DPAPI
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RSA
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Both
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None of the Above
Choose the best statement that best describes the relationship between JSP and servlets
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Servlets are built on JSP semantics and all servlets are compiled to JSP pages for runtime usage.
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JSPs are built on servlet semantics and all JSPs are compiled to servlets for runtime usage.
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JSP and servlets are unrelated technologies.
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None of the Above
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.
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Message
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StackTrace
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Source
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Line number
If a Runtime Exception is thrown in the finalize method
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The running application crashes`
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The exception is simply ignored and the object is garbage collected
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The exception is simply ignored, but the object is not garbage collected
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If a Runtime Exception is thrown in the finalize method
AI Explanation
To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) The running application crashes - This option is incorrect because if a Runtime Exception is thrown in the finalize method, it does not necessarily mean that the entire application will crash. The finalize method is called by the garbage collector before an object is garbage collected, and any exception thrown in this method does not directly affect the running application.
Option B) The exception is simply ignored and the object is garbage collected - This option is correct. When a Runtime Exception is thrown in the finalize method, it is simply ignored by the garbage collector. The object will still be eligible for garbage collection and will be collected at some point in the future.
Option C) The exception is simply ignored, but the object is not garbage collected - This option is incorrect. Regardless of whether an exception is thrown in the finalize method or not, the object will still be eligible for garbage collection. The exception does not prevent the object from being garbage collected.
Option D) If a Runtime Exception is thrown in the finalize method - This option is incomplete and does not provide a complete statement.
The correct answer is B) The exception is simply ignored and the object is garbage collected. This option is correct because any exception thrown in the finalize method is ignored and does not prevent the object from being garbage collected.
Choose the correct statement from the given choice?
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Arrays in Java are essentially objects
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It is not possible to assign one array to another. Individual elements of array can however be assigned.
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Array elements are indexed from 1 to size of array
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If a method tries to access an array element beyond its range, a compile warning is generated.
AI Explanation
To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Arrays in Java are essentially objects - This option is correct because arrays in Java are indeed objects. In Java, arrays are a special type of object that can hold a fixed number of elements of the same type.
Option B) It is not possible to assign one array to another. Individual elements of the array can, however, be assigned - This option is incorrect. In Java, it is possible to assign one array to another using the assignment operator. For example: int[] array1 = {1, 2, 3}; int[] array2 = array1;. This assigns array1 to array2, meaning both arrays now refer to the same memory location.
Option C) Array elements are indexed from 1 to the size of the array - This option is incorrect. In Java, array elements are indexed from 0 to size-1. The first element of an array is accessed using the index 0, not 1.
Option D) If a method tries to access an array element beyond its range, a compile warning is generated - This option is incorrect. In Java, if a method tries to access an array element beyond its range, it will not generate a compile warning. Instead, it will throw an ArrayIndexOutOfBoundsException at runtime.
The correct answer is A) Arrays in Java are essentially objects. This option is correct because arrays in Java are objects.
Which of the following command options of aspnet_regiis is used to encryption config sections?
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–e
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–pe
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-enc
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All of the Above
Which character is used to continue a statement in SQL*Plus?
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*
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/
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=
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INSTR
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SUBSTRING
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SUBSTR
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POS
The primary key on table EMP is the EMPNO column. Which of the following statements will not use the associated index on EMPNO?
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select * from EMP where nvl(EMPNO, '00000') = '59384';
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select * from EMP where EMPNO = '59384';
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select EMPNO, LASTNAME from EMP where EMPNO = '59384';
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select 1 from EMP where EMPNO = '59834';
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
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The DLI call did specify a segment I/O area
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The function code field specified for the DLI call contains an incorrect value
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The DLI call attempted to perform an operation which is not authorised by processing option specified in the PCB
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The DLI call specifies an invalid SSA.