How Can I Efficiently Update Multiple MySQL Rows Concurrently?

Concurrent MySQL Row Updates: Best Practices

Optimizing database performance often involves efficient techniques for updating multiple rows. This article outlines strategies for achieving concurrent updates in MySQL.

Leveraging INSERT ... ON DUPLICATE KEY UPDATE for Batch Operations

MySQL's INSERT ... ON DUPLICATE KEY UPDATE statement offers a powerful method for inserting new rows or updating existing ones based on provided values. This is particularly beneficial for performing multiple updates simultaneously.

Illustrative Example:

Consider this table structure:

Name	id	Col1	Col2
Row1	1	6	1
Row2	2	2	3
Row3	3	9	5
Row4	4	16	8

To consolidate multiple updates into a single query, use the following:

<code class="language-sql">INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);</code>

This query performs the following actions:

• Inserts rows with IDs 1, 2, and 3 if they don't exist.
• Updates Col1 to 10 and Col2 to 12 for the row with ID 4.

The ON DUPLICATE KEY UPDATE clause prevents duplicate entries, ensuring updates are applied correctly. This approach significantly improves efficiency compared to individual UPDATE statements.

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