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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 […]

Disk I/O MySQL: Explaining Higher Than Expected I/O on 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 […]

MySQL 8 Invisible Indexes: How They Work in Practice

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 […]

MySQL Ransactions: What Happens to Uncommitted Transactions After a Crash

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 […]

InnoDB Ordered vs Random Index Insertion: Performance Impact

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 […]

MySQL InnoDB Mutex Waits: Monitoring with Performance Schema in MySQL 8

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 […]

MySQL 8 Group Commit: Optimizing Performance

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 […]

MySQL Histograms: When MySQL Ignores Them

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