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 […]
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. […]
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 […]
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 […]
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 […]
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 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 […]
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, […]
PostgreSQL execution plans PostgreSQL execution plans provide information on how the database intends to execute a given query. Understanding execution plans is crucial to identify performance issues and optimize query performance. Here are some of […]
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