Isolation levels in PostgreSQL play a crucial role in ensuring the consistency, performance, and scalability of your applications. By understanding and selecting the appropriate isolation level, you can develop optimal and scalable PostgreSQL-based applications. Let’s […]
In MySQL, operators in a query execution plan can be classified as streaming or blocking. This classification is based on how they process and propagate rows during query execution. Let’s explore the differences between streaming […]
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 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 […]
In MySQL, you can use query hints to give suggestions or directives to the query optimizer. These hints guide the optimizer on how to generate the execution plan for a specific query. As a result, […]
In PostgreSQL, you can gather statistics only when they become stale by using the pg_stat_statements extension along with the track_activity_query_size configuration parameter. Follow these steps to achieve this: CREATE EXTENSION pg_stat_statements; 3. Query the pg_stat_statements […]
In PostgreSQL, there are several reasons why SQL statement plans can change for the worse over time. These changes can result in decreased query performance and unexpected behavior. Here are some common factors that can […]
Concurrent statistics gathering in PostgreSQL allows for collecting table and column statistics without blocking concurrent read and write operations. This feature helps ensure accurate and up-to-date statistics while minimizing the impact on database performance. Here’s […]
In PostgreSQL, you can force a query to use bind-aware cursor sharing by utilizing the CURSOR_SHARING parameter. By setting CURSOR_SHARING to ‘FORCE’, PostgreSQL will attempt to share cursors for similar queries with different literal values. […]
PostgreSQL’s query optimizer (or planner) creates optimal execution plans for SQL queries by evaluating multiple possible plans and selecting the fastest one. [^1] Understanding PostgreSQL’s Approach to Optimizer Hints PostgreSQL takes a deliberately cautious approach […]
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