MinervaDB

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PostgreSQL Performance

How is the transaction model implemented in PostgreSQL?

How is the transaction model implemented in PostgreSQL? In PostgreSQL, transactions are implemented using the Multi-Version Concurrency Control (MVCC) model. This means that each transaction is given a snapshot of the database at the start […]

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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

How I/O cache influence PostgreSQL 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

How to tune a slow query in PostgreSQL?

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 […]