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PostgreSQL Freelists: Internals and Implementation

The freelists in PostgreSQL are implemented as a linked list of pages. Each page is a unit of disk space that is managed by the freelist, and its size is determined by the block size […]

PostgreSQL CPU Cache Buffers Chains Latch: How to Monitor It

The CPU Cache Buffers Chains Latch in PostgreSQL is a synchronization mechanism that protects the buffer cache data structure. The buffer cache is a pool of memory used by PostgreSQL to cache disk blocks that […]

PostgreSQL Reverse Key Indexes: How to Implement Them

A reverse key index in PostgreSQL is an index that stores its keys in reverse order. This type of index can help improve query performance when the order of the keys in a table’s primary […]

PostgreSQL Mutex tips and techniques

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 […]

PostgreSQL Row Lock and Row Level Locking

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 […]

PostgreSQL Parallel Hash Joins Explained

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 […]

PostgreSQL Direct Path Reads: How They Work for Performance

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 […]

PostgreSQL Buffer Header Queues Explained

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 […]

PostgreSQL Indexing: When Does BRIN Win?

BRIN (Block Range INdex) is a type of index in Postgres that is used for large tables with a large number of rows and a high degree of clustering. BRIN is an efficient way to […]

PostgreSQL Block Visits and Undo: How They Are Implemented

In PostgreSQL, data block visits and undo are implemented as part of the storage and transaction management systems. In summary, PostgreSQL implements data block visits and undo through a combination of the buffer manager, the […]

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