What is cursor based implementation?
1. CURSOR IMPLEMENTATION Cursor implementation is nothing but the linked list representation usingarray. Operations: • Initialization of array • Insertion: Insert new element at postion pointed by header(ZERO) and assign new position which is null to header.
What is a cursor in data structures?
In computer science, a database cursor is a mechanism that enables traversal over the records in a database. Cursors facilitate subsequent processing in conjunction with the traversal, such as retrieval, addition and removal of database records.
What is a cursor list?
A CursorList is an array version of a Linked List. Essentially you have an array of list nodes but instead of each node containing a pointer to the next item in the linked list, each node element in the array contains the index for the next node element.
What is the principle of circular linked list?
Circular Linked List is a variation of Linked list in which the first element points to the last element and the last element points to the first element. Both Singly Linked List and Doubly Linked List can be made into a circular linked list.
How can you detect the presence of cycles in a circular linked list?
- A. Keep one node as head and traverse another temp node till the end to check if its ‘next points to head.
- B. Have fast and slow pointers with the fast pointer advancing two nodes at a time and slow pointer advancing by one node at a time.
- C. Cannot determine, you have to pre-define if the list contains cycles.
- D.
What are different types of cursor?
Cursors are used to store Database Tables. There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors. These are explained as following below….What is Cursor in SQL ?
- Declare Cursor Object.
- Open Cursor Connection.
- Fetch Data from cursor.
- Close cursor connection.
- Deallocate cursor memory.
What is the difference between a view and a cursor?
View is a database object similar to table so it can be used with both SQL and PL/SQL. Cursor is defined and used within the block of stored procedure which means it can be only used with PL/SQL.
What is the cursor implementation of linked lists?
The alternate method we will describe is known as a cursor. implementation. The two important items present in a pointer implementation of linked lists are 1. The data is stored in a collection of structures. Each structure contains the data and a pointer to the next structure.
Where are the unused nodes in a cursor linked list?
In the cursor implementation, we build the storage pool ourselves, storing our unused nodes in a linked list stored in an array. In C and C++, the storage pool is managed by a set of library functions provided by the language. At the beginning of execution, a suitably large pool of storage is obtained from the operating system.
What happens when a number is removed from a cursor list?
As listNode objects are assigned to elements of the array, the Freelist removes those indices. When a number is removed (such as the example with 5 above), the index is added back to the Freelist. If we want to add a number to the CursorList we just update the next indices for the appropriate elements.