PostgreSQL Internals

Common Table Expressions (CTEs) provide a structured way to define temporary named result sets within a SQL statement in PostgreSQL. In particular, CTEs are useful for breaking down complex queries into smaller, more manageable parts. […]

In PostgreSQL, the system allocates memory at various stages during query execution and other database operations. Below are key points where PostgreSQL allocates memory: It’s important to note that memory allocation in PostgreSQL is dynamic […]

Tuning work_mem to dictate the number of blocks that a process can read from a single sort run in one read in PostgreSQL In PostgreSQL, the work_mem configuration parameter controls how many blocks a process […]

In PostgreSQL, the query optimizer has several access paths at its disposal to determine the most efficient way to access and retrieve data from tables or indexes. The choice of access path depends on factors […]

In PostgreSQL, multipass hash joins serve as a join algorithm that efficiently processes join operations between large tables. Unlike traditional hash joins, which require loading the entire hash table into memory, multipass hash joins follow […]

PostgreSQL Clustering_Factor In PostgreSQL, the clustering factor is a statistic that shows how closely the physical order of rows matches the logical order defined by the clustering key.This metric becomes especially important for tables that […]

In PostgreSQL, index height refers to the number of levels or layers within an index structure. Each level represents a layer of index blocks that store pointers to the actual data in a table. Understanding […]

In PostgreSQL, you can use reverse key indexes can be used to reduce leaf block contention and improve performance, especially in scenarios when high contention occurs on the last block of an index.. This technique […]

  In PostgreSQL, tuning block sizes can have a significant impact on performance, especially for workloads that involve large sequential scans or high I/O operations. By adjusting the block size, you can optimize data storage […]

While default values in PostgreSQL can be convenient and provide initial values for columns, certain default values can have a detrimental impact on PostgreSQL performance. Here are some examples of potentially deadly default values and […]