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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 […]

Troubleshooting MySQL 8 locks and wait events, How they influence MySQL performance?

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 […]

Detailed explanation for higher than expected Disk I/O on MySQL Hot Tables

MySQL Hot Tables are tables that experience a high volume of traffic and activity, and can quickly become a bottleneck for database performance. When you see higher than expected disk I/O on MySQL Hot Tables, […]

How to prevent Replication Break in MySQL while adding INDEX/COLUMN using PT-OSC (pt-online-schema-change)?

When adding indexes or columns in MySQL, it is important to be aware of the potential for replication to break. One way to prevent this is to use a tool like pt-online-schema-change from the Percona […]

How invisible indexes in MySQL 8 works?

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 […]

What happens to uncommitted transactions in MySQL if the server crashes after the update?

In MySQL, if the server crashes after an update and the transaction was not committed, the changes made by the transaction will be rolled back during the crash recovery process. This is because MySQL uses […]

Impact of ordered vs. random index insertion in InnoDB

The impact of ordered versus random index insertion in InnoDB depends on several factors, including the size and complexity of the table, the frequency of inserts, and the workload of the database. Ordered index insertion […]

How to Monitor InnoDB Mutex Waits in MySQL 8 Using Performance Schema?

InnoDB Mutexes are synchronization objects used by the InnoDB storage engine to ensure that different threads can access shared resources safely. Mutex waits can be a bottleneck for performance in MySQL 8, as they can […]

Optimizing MySQL 8 Performance with Group Commit

Comprehensive Guide to Optimizing MySQL 8 Performance with Group Commit: Understanding, Fine-Tuning System Variables, and Monitoring Techniques for Enhanced Throughput and Reduced Disk I/O Overhead Group commit in MySQL 8 is a critical feature that […]

When MySQL ignores histograms?

MySQL can ignore histograms in the query optimizer when it determines that using the histograms would not provide any benefit to the query execution plan. This can occur in several cases, including: Why MySQL ignores […]

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MySQL Troubleshooting