MinervaDB

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MinervaDB

How to handle NULL values in PostgreSQL

How to handle NULL values in PostgreSQL IS NULL: This operator is used to check if a column or expression is NULL. Example: SELECT * FROM table WHERE column_name IS NULL; IS NOT NULL: This […]
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PostgreSQL Performance

PostgreSQL I/O Cache: How It Influences Performance

How I/O cache influence PostgreSQL performance? I/O cache plays an important role in PostgreSQL performance as it can greatly reduce the number of disk I/O operations that need to be performed. The PostgreSQL server uses [...]
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PostgreSQL Performance

Inspecting PostgreSQL Locks

Inspecting PostgreSQL Locks Inspecting PostgreSQL locks can be done using the pg_locks view in the system catalog. This view displays information about all currently held and awaited locks. The columns in this view include the [...]
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PostgreSQL Performance

PostgreSQL Slow Query: How to Tune It

How to tune a slow query in PostgreSQL? Tuning a slow query in PostgreSQL can involve several steps. Here are some general steps to take: Identify the slow query: Use the pg_stat_activity view to see [...]
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MySQL Performance

How MySQL optimizer works?

How does MySQL optimizer work? The MySQL optimizer is responsible for determining the most efficient way to execute a SQL statement. It evaluates different query execution plans and chooses the one that it estimates will […]
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MySQL Performance

MySQL Latches: Understanding How They Work

Understanding Latches in MySQL In MySQL, latches are used to protect shared data structures and ensure consistency in the database. They are used by the storage engine to synchronize access to shared resources such as […]
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PostgreSQL DBA

PostgreSQL 15 Parallelized Vacuum: How to Implement It

How to implement Parallelized Vacuum in PostgreSQL 15? In PostgreSQL 15, the parallelized vacuum feature allows you to run multiple vacuum processes in parallel, which can significantly improve the performance of the vacuum operation. Here [...]
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Linux Performance

Linux Queueing: How It Influences Performance

How does queueing affect Linux Server performance? In Linux, queueing is implemented using a variety of different tools and mechanisms. Some of the most common tools and mechanisms used for queueing in Linux include: The [...]
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PostgreSQL DBA

What’s new with PostgreSQL 15?

PostgreSQL 15 new features  PostgreSQL 15, the latest version of the popular open-source relational database management system, was released on October 3rd, 2021 and it comes with several new features and improvements: Parallelized Vacuum: PostgreSQL [...]