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PostgreSQL Default Values: Avoiding Deadly Pitfalls

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 […]

PostgreSQL Hints and Costs Explained

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 […]

PostgreSQL Cost-Based Optimizer: Query Transformation Under the Hood (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. […]

PostgreSQL Median Absolute Deviation: Finding Outliers

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 […]

PostgreSQL isnumeric: Identifying Strings That Can Be Treated as Numbers

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 […]

PostgreSQL Alphanumeric String isalnum: Determine If a String Is Alphanumeric

PostgreSQL Table Column Limit: Safely Increasing It 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 Error PostgreSQL: Using IF [NOT] EXISTS for Object Creation and Removal

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 […]

PostgreSQL Index Wildcard Explained

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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