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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 […]

How to determine if a string is alphanumeric in PostgreSQL?

How to Safely Increase PostgreSQL’s Table Column Limit Beyond 1664

If you’ve ever encountered the PostgreSQL column limit of 1,664 columns per table, you know it can be a real hurdle when designing wide tables. This limit is enforced by the internal MaxTupleAttributeNumber parameter. In […]

Prevent errors during object creation and removal using the IF [NOT] EXISTS DDL clause in PostgreSQL

The IF [NOT] EXISTS DDL clause is a useful feature in PostgreSQL that can help prevent errors during object creation and removal. This clause allows database administrators to specify whether or not to create or […]

Index Wildcard in PostgreSQL

Index wildcard is a technique used in PostgreSQL to create an index on a partial string in a column, rather than indexing the entire column. This technique can improve query performance when searching for data […]

Troubleshooting PostgreSQL Query Performance

Monitoring query latency, wait events, and locks in PostgreSQL helps identify and diagnose performance bottlenecks. Here’s a guide on how to monitor these aspects: Here’s a sample query to gather information about locks, wait events, […]

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