MySQL Internals

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MySQL Internals

Understanding cursor implementation in MySQL

In MySQL, a cursor is a database object that allows you to retrieve and manipulate data row by row. It provides a mechanism for iterative processing of query results. Cursors are often used when you […]
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InnoDB

Reading and Writing Blocks in InnoDB

InnoDB, the default storage engine in MySQL, uses a buffer pool to manage the reading and writing of data blocks. The buffer pool is a cache that holds frequently accessed data pages in memory, reducing […]
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MySQL Internals

Streaming versus blocking operators in MySQL

In MySQL, operators in a query execution plan can be classified as streaming or blocking. This classification is based on how they process and propagate rows during query execution. Let’s explore the differences between streaming […]
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MySQL Internals

MySQL Scalar Subquery Unnesting transformation

Scalar subquery unnesting is a transformation technique that the MySQL optimizer uses to optimize queries involving scalar subqueries. Scalar subqueries return a single value. You typically use them in expressions or as part of the […]