What is an Index in MariaDB?
An index in MariaDB is a type of database structure that facilitates fast and easy access to data within a table. It functions similarly to a book’s index in that it gives you a pointer to the location of particular data, making it possible for you to find information more quickly. Let’s see how we drop an index using the below methods as follows.
- Using DROP INDEX Statement
- Using ALTER TABLE Statement with DROP INDEX Clause
- Using ALTER TABLE Statement with DROP KEY Clause
Let’s set up an environment for DROP an Index
To understand How to Drop an index in MariaDB we need a table on which we will perform various operations. So we create a table example_table.
Creating the table example_table with PRIMARY KEY
Query:
CREATE TABLE example_table (
id INT PRIMARY KEY,
name VARCHAR(50),
age INT,
email VARCHAR(100),
is_student BOOLEAN
);
Creating an Index on example_table (name, age, email) column.
Query:
CREATE INDEX name_index ON example_table (name);
CREATE INDEX age_index ON example_table (age);
CREATE INDEX email_index ON example_table (email);
Showing the Indexes on table example_table
Query:
SHOW INDEX FROM example_table;
Output:
Output
Dropping an Index in MariaDB
In MariaDB, indexes play a crucial role in enhancing query performance by facilitating fast data access within a table. However, there are scenarios where you might need to drop indexes. This article explores various methods to drop indexes in MariaDB, including using DROP INDEX, ALTER TABLE DROP INDEX, and ALTER TABLE DROP KEY statements. Additionally, it covers dropping a primary key index using ALTER TABLE DROP PRIMARY KEY.
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