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PostgreSQL multipass hash joins Explained

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 […]

Understanding clustering_factor in PostgreSQL

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 […]

How does Index Height in PostgreSQL influence performance?

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 […]

How can you use Reverse Key Indexes in PostgreSQL to reduce Leaf Block Contention?

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 […]

How to tune PostgreSQL by changing Block Sizes?

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 […]

Deadly default values in PostgreSQL

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 […]

Hints and Costs in PostgreSQL

Understanding Hints and Costs in PostgreSQL Query Optimization Firstly, hints and costs are two important concepts in PostgreSQL query optimization. They help improve query performance by giving the optimizer additional information about how to execute […]

Looking under the hood of query transformation (done by CBO) in PostgreSQL with a simple real-life example

Understanding Query Transformation in PostgreSQL CBO Query transformation plays a crucial role in the PostgreSQL Cost-Based Optimizer (CBO). It enables the optimizer to modify a user’s SQL query to generate a more efficient query plan. […]

How to find outliers using the Median Absolute Deviation in PostgreSQL?

In PostgreSQL, you can actively use the Median Absolute Deviation (MAD) to identify outliers in a dataset. Since MAD is a robust statistic, it measures variability more effectively than traditional metrics. Moreover, it remains less […]

How to identify strings that can be treated as numbers in PostgreSQL?

In PostgreSQL, you can apply the isnumeric function to identify strings that PostgreSQL can treat as numbers. The isnumeric function returns TRUE if all characters in the string are numeric, and FALSE otherwise. Here is an […]

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