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 used by the MySQL optimizer to optimize queries that involve scalar subqueries. Scalar subqueries are subqueries that return a single value, typically used in expressions or as part […]
In MySQL, you can use query hints to provide suggestions or directives to the query optimizer about how to generate the execution plan for a specific query. Query hints allow you to have more control […]
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 […]
Introduction In InnoDB, a linear tree is a type of data structure used for indexing and searching data. Linear trees are also known as B+ trees. The key characteristic of a linear tree is that […]
The MySQL Slow Query Log is a feature that logs SQL statements that exceed a certain threshold of execution time. This log can be used to identify slow queries and to optimize their performance. Here […]
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