Oracle Database Cursors Basics Quiz
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Questions and Answers

What does a cursor serve as in the context of an Oracle database?

  • A pointer to the Process Global Area (PGA)
  • A placeholder for data retrieval
  • A pointer to a memory area known as the context area (correct)
  • A storage location for SQL or DML statements

What kind of information does the context area, pointed to by a cursor, hold?

  • Statistics on database performance
  • Metadata about database objects
  • Information about user privileges
  • Vital information about the processing of SQL or DML statements (correct)

Where is the context area, to which a cursor points, located?

  • In the Program Global Area (PGA)
  • Within the SQL buffer
  • In the System Global Area (SGA)
  • Inside the Process Global Area (PGA) (correct)

What type of information does the context area within the PGA hold?

<p>Rows returned by a query (D)</p> Signup and view all the answers

What does the context area assist the Oracle server in processing?

<p>SQL statements (D)</p> Signup and view all the answers

What type of information does the context area within the PGA hold?

<p>Rows returned by a query (C)</p> Signup and view all the answers

What does the context area assist the Oracle server in processing?

<p>SQL statements (A)</p> Signup and view all the answers

What does a pointer within the context area in the PGA refer to?

<p>The parsed query in the shared pool (B)</p> Signup and view all the answers

What type of cursors are automatically created by the Oracle server when an SQL DML statement is executed?

<p>Implicit Cursors (B)</p> Signup and view all the answers

Where are implicit cursors created in the Oracle database?

<p>Automatically by the Oracle server (A)</p> Signup and view all the answers

For which type of statements must users create explicit cursors in Oracle database?

<p>Statements that return more than one row of data (B)</p> Signup and view all the answers

What is the first step in creating an explicit cursor in PL/SQL?

<p>Declare the cursor in the declaration section (B)</p> Signup and view all the answers

Where is the explicit cursor associated with a SELECT statement initialized?

<p>Declaration section (D)</p> Signup and view all the answers

What does declaring an explicit cursor involve in PL/SQL?

<p>Initializing a cursor into memory and associating it with a SELECT statement (B)</p> Signup and view all the answers

How is a cursor declared in PL/SQL?

<p>CURSOR cursor_name IS select_statement; (C)</p> Signup and view all the answers

What does declaring a cursor involve in PL/SQL?

<p>Specifying the SQL SELECT statement that the cursor will hold (C)</p> Signup and view all the answers

How is data retrieved from a cursor in PL/SQL?

<p>FETCH cursor_name INTO PL/SQL variable; (B)</p> Signup and view all the answers

What happens once a cursor is declared and opened in PL/SQL?

<p>Data can be retrieved into a PL/SQL variable or a PL/SQL record (B)</p> Signup and view all the answers

What is the purpose of the FETCH statement in PL/SQL?

<p>To retrieve data from a cursor into a PL/SQL variable (B)</p> Signup and view all the answers

What does opening a cursor in PL/SQL involve?

<p>Allocating memory for the cursor (C)</p> Signup and view all the answers

What is the next step after opening a cursor in PL/SQL?

<p>Fetching data (A)</p> Signup and view all the answers

What is the purpose of the closing statement for a cursor in PL/SQL?

<p>Relinquishes all associated resources (D)</p> Signup and view all the answers

What action should be taken after finishing work with a cursor in PL/SQL?

<p>Close the cursor (D)</p> Signup and view all the answers

What does the 'CLOSE' command do in PL/SQL when used with a cursor?

<p>Relinquishes all associated resources (B)</p> Signup and view all the answers

What are the four steps for creating an explicit cursor in PL/SQL?

<p>Declare the cursor, Open the cursor, Fetch data from the cursor, Close the cursor (C)</p> Signup and view all the answers

What is the purpose of the FETCH statement in PL/SQL?

<p>To retrieve data from the active set of a cursor (C)</p> Signup and view all the answers

What does the OPEN statement do in the context of an explicit cursor in PL/SQL?

<p>It makes the cursor's result set available for fetching (C)</p> Signup and view all the answers

What is the purpose of the FETCH statement in PL/SQL when used with a cursor?

<p>To retrieve data from the active set one row at a time (A)</p> Signup and view all the answers

What does the 'CLOSE' command do in PL/SQL when used with a cursor?

<p>It closes the cursor and releases associated resources (C)</p> Signup and view all the answers

What is the first step in creating an explicit cursor in PL/SQL?

<p>Declare the cursor (D)</p> Signup and view all the answers

What is the purpose of the SET SERVEROUTPUT ON statement in the declaration section of a PL/SQL block?

<p>To enable viewing the cursor's results on the default display screen (B)</p> Signup and view all the answers

What is the purpose of declaring a variable in the declaration section of a PL/SQL block?

<p>To store the data retrieved by the cursor (B)</p> Signup and view all the answers

What does the LOOP structure in the code comprise of?

<p>cursor opening, loop structure, fetch statement, DMS outpout statement, exit statement, closing cursor (A)</p> Signup and view all the answers

What happens when the DBMS OUTPUT statement is used in PL/SQL?

<p>The fetched data is displayed on the default output screen (D)</p> Signup and view all the answers

When does the loop exit in PL/SQL using the %NOTFOUND attribute?

<p>When no more data is found (C)</p> Signup and view all the answers

What is the purpose of closing the cursor in PL/SQL?

<p>To release associated resources (C)</p> Signup and view all the answers

What is the data type of %FOUND attribute in PL/SQL?

<p>Boolean (C)</p> Signup and view all the answers

What does %NOTFOUND indicate in PL/SQL when the most recent fetch operation did not return a row?

<p>No rows were fetched (D)</p> Signup and view all the answers

What does %ROWCOUNT return in PL/SQL?

<p>The number of rows that have been fetched (B)</p> Signup and view all the answers

What does the %FOUND attribute indicate in PL/SQL?

<p>Returns TRUE if the most recent fetch operation returned a row (B)</p> Signup and view all the answers

What does the %NOTFOUND attribute indicate in PL/SQL?

<p>Returns TRUE if the most recent fetch operation did not return a row (B)</p> Signup and view all the answers

What happens when a cursor is closed in PL/SQL?

<p>The cursor is deallocated and associated resources are released (B)</p> Signup and view all the answers

What does the FETCH statement in PL/SQL do when used with a cursor?

<p>Retrieves the next row from the result set (A)</p> Signup and view all the answers

What type of cursors are automatically created by the Oracle server when an SQL DML statement is executed?

<p>Implicit cursors (D)</p> Signup and view all the answers

What is the syntax for a basic cursor loop in PL/SQL?

<p>open cursor, LOOP fetch v_name into cursurname, exit, executable, end loop, close cursor (D)</p> Signup and view all the answers

What is the syntax for a cursor for loop in PL/SQL?

<p>FOR record_name IN cursor_name LOOP (D)</p> Signup and view all the answers

What is the purpose of the FETCH statement in PL/SQL when used with a cursor?

<p>To retrieve the next row from the result set into the record (C)</p> Signup and view all the answers

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