Podcast
Questions and Answers
What is the purpose of defining explicit cursors in Oracle?
What is the purpose of defining explicit cursors in Oracle?
- To optimize memory allocation
- To simplify database schema design
- To control the execution when dealing with multiple records (correct)
- To automatically execute select statements
What happens when a cursor is declared in Oracle?
What happens when a cursor is declared in Oracle?
- A select statement is associated with the cursor (correct)
- The cursor is executed immediately
- The cursor becomes inactive
- The cursor automatically retrieves all records
What is generated in memory when a cursor is opened in Oracle?
What is generated in memory when a cursor is opened in Oracle?
- An index of available cursors
- An active set of records from the associated select statement (correct)
- A blank memory space
- A pointer to the select statement
When can records be retrieved from an active cursor in Oracle?
When can records be retrieved from an active cursor in Oracle?
What is the role of fetch operation in Oracle cursors?
What is the role of fetch operation in Oracle cursors?
What is the purpose of declaring an explicit cursor in Oracle?
What is the purpose of declaring an explicit cursor in Oracle?
What is the initial step when declaring an explicit cursor in Oracle?
What is the initial step when declaring an explicit cursor in Oracle?
What happens when a cursor is opened in Oracle?
What happens when a cursor is opened in Oracle?
What is the purpose of the fetch operation in Oracle cursors?
What is the purpose of the fetch operation in Oracle cursors?
What is the role of the active set in Oracle cursors?
What is the role of the active set in Oracle cursors?
Study Notes
Summary of "Explicit Cursors in Database Management"
- Explicit cursors are used to control the execution when dealing with multiple records in a database.
- When declaring a cursor, it is associated with a select statement to retrieve records.
- The select statement associated with the cursor is not executed when the cursor is declared, but an active set is generated in the memory.
- The active set contains the results of the select statement execution and is used for fetch operations.
- After declaring and associating a select statement with the cursor, the cursor can be manipulated to retrieve records from the associated select statement.
- The fetch operation is used to retrieve records from the active set associated with the cursor.
- The explicit cursor allows for precise control over record retrieval and manipulation in database management.
- It is necessary to define explicit cursors to manage the execution of multiple records effectively.
- The active set generated in the memory contains the results that need to be retrieved through fetch operations.
- The cursor is opened to access the active set and retrieve records from the associated select statement.
- The steps involved in working with explicit cursors include declaration, association with a select statement, manipulation, and fetch operations.
- The explicit cursor provides a mechanism for efficient and controlled handling of multiple records in database management.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of explicit cursors in Oracle PL/SQL with this quiz. Explore the steps involved in defining and using explicit cursors, and enhance your understanding of controlling the execution when dealing with multiple records.