Tag: databases

Questions Related to databases

  1. There is no affect on procedure A and it runs successfully

  2. Procedure B is invalidated and recompiles when invoked.

  3. Procedure A is invalidated and recompiles for the first time it is invoked.

  4. Procedure A is invalidated and recompiles for the second time it is invoked


Correct Option: D
  1. A comma has been left after the STATS_EXIST_EXCEPTION exception.

  2. The STATS_EXIST_EXCEPTION has not been declared as a number

  3. The STATS_EXIST_EXCEPTION has not been declared as an exception

  4. Only predefined exceptions are allowed in the EXCEPTION section.


Correct Option: C
Explanation:

To solve this question, the user needs to have knowledge about PL/SQL syntax, specifically about creating stored procedures, and error handling using exceptions.

Option A is incorrect. The procedure does not have any syntax errors; there is no errant comma.

Option B is incorrect. The STATS_EXIST_EXCEPTION is not a number or a variable that needs to be declared. It is a user-defined exception that will be raised in case of an exception with the specified condition.

Option C is correct. The STATS_EXIST_EXCEPTION is not declared as an exception, which will cause an error during compilation of the stored procedure. The correct way of declaring a user-defined exception is as follows:

EXCEPTION
  WHEN  THEN
      -- handle the exception

Option D is incorrect. PL/SQL allows users to define their own exceptions using the EXCEPTION keyword. Predefined exceptions are not the only exceptions allowed in the EXCEPTION section.

Therefore, the correct answer is:

The Answer is: C. The STATS_EXIST_EXCEPTION has not been declared as an exception.

  1. The user had to have knowledge of the table and index structures

  2. Navigational data access was far slower than declarative access

  3. Navigational access languages required the coder to embed their queries inside a procedural language shell

  4. Navigational languages were far slower then SQL


Correct Option: A
  1. SQL cannot support object-orientation

  2. The same query can be written in many ways, each with vastly different execution plans

  3. SQL syntax is too difficult for non-computer professionals to use

  4. SQL creates excessive locks within the database


Correct Option: B
  1. Independence of table relationships

  2. High speed of SQL

  3. Powerful GUI front-end

  4. Easy to install and use


Correct Option: A
  1. The number of CPUs on the server

  2. The degree of parallelism on the tables

  3. The use of bitmap indexes

  4. The quality of the SQL optimization


Correct Option: D
  1. Removal of data redundancy

  2. The introduction of data redundancy

  3. The introduction of non-first normal form relations

  4. The introduction of SQL*Plus


Correct Option: B
  1. A sequence will never generate duplicate values. b.The MAXVALUE of a sequence can be equal to the MINVALUE. c.It is not possible to create a sequence that generates a constant since the INCREMENT value must be greater than zero.

  2. The MAXVALUE of a sequence can be equal to the MINVALUE

  3. It is not possible to create a sequence that generates a constant since the INCREMENT value must be greater than zero.

  4. When a sequence cycles back to either the MAXVALUE or MINVALUE, it will always be equal to the specified value of either of these two boundaries.


Correct Option: B