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databases Online Quiz - 39

Description: databases Online Quiz - 39
Number of Questions: 20
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Tags: databases
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Using NVL(),TO_DATE (), TO_NUMBER () functions in 'where' clause on non-indexed columns does improve performance

technology databases

  1. True

  2. False

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Correct Option: A

Which View helps in querying high I/O statements?

technology databases

  1. V$SQLSTATS.DISK_READS

  2. V$DISK_READS

  3. V$SQL_STATS

  4. V$SYS_STAT

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Correct Option: A

Which of the following generates the PLAN for SQL statements?

technology databases

  1. PLAN

  2. EXPLAIN PLAN

  3. TKPROF

  4. V$PLAN

Show answer
Correct Option: B

In which version of Oracle is AWR Introduced ?

technology databases

  1. 11g

  2. 9i

  3. 8i

  4. 10g

Show answer
Correct Option: D

Is Statspack available in Oracle 11g?

technology databases

  1. True

  2. False

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Correct Option: A

Which user owns all the package of STATSPACK?

technology databases

  1. PERFMON

  2. PERFSTAT

  3. SYSTEM

  4. SCOTT

Show answer
Correct Option: B

Which of the following is not a schema object?

technology databases

  1. Indexes

  2. Tables

  3. Public Synonyms

  4. Triggers and Packages

Show answer
Correct Option: C

AI Explanation

To answer this question, you need to understand the concept of schema objects in a database.

A schema object is a logical database structure that is created and owned by a specific user or schema in a database. These objects are used to store, manage, and manipulate data within the database.

Let's go through each option to understand why it is correct or incorrect:

Option A) Indexes - This option is a schema object. Indexes are database objects that improve the speed of data retrieval operations on database tables.

Option B) Tables - This option is a schema object. Tables are used to store data in a structured manner and are one of the fundamental objects in a database.

Option C) Public Synonyms - This option is not a schema object. Public synonyms are used to provide a consistent and simplified naming convention for database objects across multiple schemas. However, they are not considered as schema objects themselves.

Option D) Triggers and Packages - This option is a schema object. Triggers and packages are database objects used to automate actions and encapsulate related procedures, functions, and variables.

The correct answer is C) Public Synonyms. This option is not a schema object because public synonyms are not considered as schema objects in a database.

If commission is null then the text “Not Applicable” must be displayed, instead of blank space. How do I write the query?

technology databases

  1. select nvl(to_char(comm),'NA') from emp;

  2. select nvl(comm,'NA') from emp;

  3. select nvl(comm,NA) from emp;

  4. None of the above

Show answer
Correct Option: A

Which data dictionary object is used to retrieve the information about the tables from a given schema?

technology databases

  1. USER_TABLES

  2. USER_TABS

  3. Both 1 & 2

  4. None of the above

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Correct Option: A

A transaction is a set of SQL statements between any two COMMIT and ROLLBACK statements.

technology databases

  1. True

  2. False

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Correct Option: A

What are the min.extents allocated to a rollback extent ?

technology databases

  1. One

  2. Two

  3. Three

  4. None of the above

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Correct Option: B

What is the maximum no.of columns a table can have ?

technology databases

  1. 254

  2. 216

  3. Alloted size

  4. None of the above

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Correct Option: A

Data Dictionary in oracle is used to store information about various physical and logical Oracle structures e.g.Tables, Tablespaces, datafiles, etc

technology databases

  1. True

  2. False

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Correct Option: A

Can Check constraint be used for self referential integrity ?

technology databases

  1. Yes

  2. No

  3. Not in Oracle

  4. None of the above

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Correct Option: A

What are the states of a rollback segment ?

technology databases

  1. ONLINE

  2. OFFLINE

  3. PARTLY AVAILABLE

  4. NEEDS RECOVERY

  5. INVALID

Show answer
Correct Option: A,B,C,D,E

What components of the IT environment can Oracle Enterprise Manager Grid Control manage?

technology databases

  1. The server machines

  2. Oracle application servers

  3. Oracle databases

  4. Third-party products

  5. All of the above

Show answer
Correct Option: E

Is the below query allowed?Select sal, ename Into x From emp Where ename = 'KING' (Where x is a record of Number(4) and Char(15));

technology databases

  1. Yes

  2. No

  3. Not in Oracle

  4. None of the above

Show answer
Correct Option: A

AI Explanation

To answer this question, we need to understand the syntax and rules for the SELECT statement in Oracle.

The SELECT statement is used to query data from a database table. It allows you to specify the columns you want to retrieve, the table you want to query from, and any conditions for filtering the results.

In the given query, the SELECT statement is used to retrieve the "sal" and "ename" columns from the "emp" table. The INTO clause is used to specify that the result of the query should be stored in the variables "x.sal" and "x.ename". The WHERE clause is used to filter the rows based on the condition "ename = 'KING'".

The syntax of the query is correct, and it is allowed in Oracle. Therefore, the correct answer is A) Yes.

A table has the following data : [[5, Null, 10]].What will the average function return ?

technology databases

  1. 10

  2. 5.5

  3. 5

  4. 7.5

Show answer
Correct Option: A

Consider a sequence whose currval is 1 and gets incremented by 1 by using the nextval reference we get the next number 2.Suppose at this point we issue an rollback and again issue a nextval.What will the output be ?

technology databases

  1. 2

  2. 3

  3. 4

  4. 1

Show answer
Correct Option: B

Which of these following features are correct if SQL is a set-oriented language?

technology databases

  1. Individual rows must have a unique identifier

  2. Sets of users can be managed in groups

  3. One statement can affect multiple rows

  4. SQL statements can be placed within blocks of code

  5. All the above

Show answer
Correct Option: C
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