PostgreSQL Performance

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

In PostgreSQL, memory allocation occurs at various stages during the execution of queries and other database operations. Here are some key points where memory is allocated in PostgreSQL: It’s important to note that memory allocation […]

In PostgreSQL, the number of blocks that a process can read from a single sort run in one read is controlled by the work_mem configuration parameter. The work_mem parameter specifies the amount of memory allocated […]

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 are a type of join algorithm used to efficiently process join operations between large tables. Unlike traditional hash joins that require loading the entire hash table into memory, multipass hash […]

In PostgreSQL, the clustering_factor is a statistic that provides information about how well the physical order of rows in a table or index matches the logical order defined by the clustering key. It is particularly […]

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, reverse key indexes can be used to reduce leaf block contention and improve performance in scenarios where there is high contention on the last block of an index. This technique is particularly beneficial […]

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 and […]

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 […]