PostgreSQL Internals

Mutexes (short for mutual exclusion) are used in PostgreSQL to ensure that only one thread of execution can access a shared resource at any given time. Here are some tips and techniques for working with […]

In PostgreSQL, row locks are used to control access to individual rows in a table, allowing multiple transactions to access the same table without interfering with each other. Row level locking is a mechanism that […]

Parallel Hash Joins in PostgreSQL are a type of join operation that can be executed in parallel, allowing for faster and more efficient execution of database queries. In a hash join, the database first builds […]

In PostgreSQL, Direct Path Read is implemented as an optimization technique for full table scans, which aims to bypass the buffer cache and read data directly from disk into the process memory, reducing the overhead […]

In PostgreSQL, buffer headers are data structures that represent a single page of data in the shared buffer cache. Each buffer header has information about the state of the page it represents, such as whether […]

In PostgreSQL, the lock behavior during an INSERT operation depends on the type of table that the operation is performed on. For a normal table, an INSERT lock is typically acquired on the table, which […]

PostgreSQL Vacuum Internals – What happens during PostgreSQL Vacuum Processing? During PostgreSQL vacuum processing, the database system scans through the table or index being vacuumed, removing any dead or outdated rows. This process is necessary […]