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 […]
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 […]
Troubleshooting redo performance in InnoDB involves identifying and addressing potential bottlenecks or issues that affect the efficiency of redo log processing. The redo log plays a critical role in ensuring data durability and crash recovery […]
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 […]
In MySQL, you can use query hints to give suggestions or directives to the query optimizer. These hints guide the optimizer on how to generate the execution plan for a specific query. As a result, […]
Introduction The InnoDB history list length can grow significantly if there are long-running transactions that generate a lot of undo logs or if there are frequent transactions with large amounts of data being modified. This […]
Introduction Redo log file IO operations can significantly impact the performance of a MySQL database. The redo log is used to recover the database after a crash or unexpected shutdown. It records all changes made […]
Locks and wait events can significantly impact MySQL performance as they can cause queries to wait, leading to slower response times and decreased performance. The main cause of lock and wait events is contention for […]
Correlated subqueries in MySQL can be slow because they require the subquery to be executed for each row in the outer query. This means that the subquery is executed repeatedly, and the results are used […]
In MySQL 8, invisible indexes are a feature that allows you to create an index without it being used by the optimizer. This can be useful in situations where you want to test the impact […]
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