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How to compute cost of slow query in PostgreSQL?

The cost of a slow query in PostgreSQL can be estimated by the Query Planner, which uses statistics about the data in the tables being queried to make predictions about the query execution time. The […]

How does Optimizer Plan Stability work in PostgreSQL?

In PostgreSQL, optimizer plan stability is a feature that allows the query planner to reuse a previously cached query plan for a SQL statement instead of generating a new plan. This can improve query performance […]

How are Global Indexes implemented in PostgreSQL?

In PostgreSQL, global indexes are implemented using a shared-nothing architecture, which means that the index data is partitioned and distributed across multiple physical nodes or “shards.” This allows for parallel query processing and improved performance […]

How do Bloom Filters Work in MyRocks?

Bloom filters are probabilistic data structures that are used for membership tests. They are particularly useful in databases as they allow faster and more efficient querying of data. In MyRocks, a storage engine based on […]

How to implement PostgreSQL synchronous_commit options and Synchronous Standby Replication?

PostgreSQL provides the option of synchronous replication to ensure that transactions are committed on the standby servers before they are acknowledged as being committed on the primary server. This can provide an added level of […]

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 avoid a mutating table happening in PostgreSQL?

In PostgreSQL, a mutating table error occurs when a row-level trigger tries to modify the same table that the trigger is defined on. This occurs because the database does not allow a query to modify […]

How Materialised Views work in PostgreSQL?

Materialized views in PostgreSQL are useful when you have frequently used queries that are complex, slow, or involve large amounts of data. In such cases, creating a materialized view can significantly improve query performance. A […]

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 MySQL 8 reduced contention for metadata locks?

MySQL 8 introduced several improvements to reduce contention for metadata locks, which are locks that are used to manage access to database objects such as tables and indexes. Here are a few ways in which […]

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