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B+ File Organization in DBMS

B+ Tree uses a tree-like structure to store records in file, as the name implies. It employs the key indexing idea, in which the primary key is used to sort the records. An index value is generated for each primary key and mapped to the record. The address of a record in the file is the index of that record.

In this article, we will dive deeper into B+ File Organization in DBMS according to the GATE Syllabus for (Computer Science Engineering) CSE. Keep reading ahead to learn more.

Table of Contents

What is B+ File Organization in DBMS?

The B+ tree file organization is a very advanced method of an indexed sequential access mechanism. In File, records are stored in a tree-like structure. It employs a similar key-index idea, in which the primary key is utilised to sort the records. The index value is generated for each primary key and mapped to the record.

Unlike a binary search tree (BST), the B+ tree can contain more than two children. All records are stored solely at the leaf node in this method. The leaf nodes are pointed to by intermediate nodes. There are no records in them.

The above B+ tree shows this:

  • The tree has only one root node, which is number 25.
  • There is a node-based intermediary layer. They don’t keep the original record. The only thing they have are pointers to the leaf node.
  • The prior value of the root is stored in the nodes to the left of the root node, while the next value is stored in the nodes to the right, i.e. 15 and 30.
  • Only one leaf node contains only values, namely 10, 12, 17, 20, 24, 27, and 29.
  • Because all of the leaf nodes are balanced, finding any record is much easier.
  • This method allows you to search any record by following a single path and accessing it quickly.

Pros of B+ Tree File Organization

  • Because all records are stored solely in the leaf nodes and ordered in a sequential linked list, searching becomes very simple using this method.
  • It’s easier and faster to navigate the tree structure.
  • The size of the B+ tree is unrestricted; therefore, the number of records and the structure of the B+ tree can both expand and shrink.
  • It is a very balanced tree structure. Here, each insert, update, or deletion has no effect on the tree’s performance.

Cons of B+ Tree File Organization

  • The B+ tree file organization method is very inefficient for the static method.

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