Discover effective MySQL commands to efficiently display indexes on a specific table, ensuring optimal database performance and maintenance with this comprehensive guide.
Table of Contents
Question
Which two commands will display indexes on the parts table in the manufacturing schema? (Choose two.)
A. DESCRIBE manufacturing.parts;
B. SELECT * FROM information_schema.statistics WHERE table_schema=’manufacturing’ AND TABLE_NAME=’parts’;
C. SHOW INDEXES FROM manufacturing.parts;
D. SELECT * FROM information_schema.COLUMN_STATISTICS;
E. EXPLAIN SELECT INDEXES FROM manufacturing.parts;
Answer
B. SELECT * FROM information_schema.statistics WHERE table_schema=’manufacturing’ AND TABLE_NAME=’parts’;
C. SHOW INDEXES FROM manufacturing.parts;
Explanation
The command `SELECT * FROM information_schema.statistics WHERE table_schema=’manufacturing’ AND TABLE_NAME=’parts’;` retrieves information about all indexes on the `parts` table in the `manufacturing` schema from the `information_schema.statistics` system view. This view provides comprehensive details about indexes, including their names, columns, cardinality, and other relevant metadata.
The command `SHOW INDEXES FROM manufacturing.parts;` is a more concise way to display all indexes on the `parts` table in the `manufacturing` schema. It presents a simplified output, listing the index names, column names, and other basic information about each index.
Both commands effectively retrieve and display the indexes defined on the specified table, enabling database administrators to review and manage indexing strategies for performance optimization and maintenance purposes.
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