PostgreSQL provides three transaction isolation levels, which control the visibility of changes made by concurrent transactions. PostgreSQL Locks: PostgreSQL uses various types of locks to ensure data consistency in concurrent environments. Locks can influence performance […]
Understanding PostgreSQL Wait Statistics is critical for optimizing database performance. Wait Statistics provide insights into the resources that are being blocked and the time that is being spent waiting for those resources. Here’s an overview […]
pg_stat_statements is a PostgreSQL extension that provides a detailed view of the SQL statements executed by the database server. It can be used to monitor the performance of VACUUM and ANALYZE operations by tracking the […]
Index fragmentation in PostgreSQL can occur when data is inserted, updated, or deleted in a table. As new data is added, the index can become fragmented, meaning that the data is no longer physically ordered […]
Pessimistic locking and optimistic locking are two approaches used in database management systems, including PostgreSQL, to control concurrent access to shared data. Pessimistic Locking: Pessimistic locking is a concurrency control mechanism that assumes conflicts will […]
Hash aggregation is a type of aggregation algorithm used in MariaDB to efficiently calculate aggregate functions such as SUM, COUNT, MAX, and MIN on large data sets. It works by dividing the data into groups […]
Declarative partitioning in MariaDB is a feature that allows you to divide a table’s data into smaller, more manageable partitions based on a specified partitioning expression. It provides an easy and intuitive way to organize […]
Avoiding the use of the “OR” operator in MariaDB can help improve query performance by reducing the number of rows that need to be scanned and filtered. Here are some strategies to avoid using “OR” […]
Using the OR operator in a SQL query can result in poor performance, especially when used in combination with other operators, such as LIKE, IN, and subqueries. In PostgreSQL, there are several techniques that can […]
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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