Hints and costs are two important concepts in PostgreSQL query optimization that can help improve query performance by providing the optimizer with additional information about how to execute a query. Hints are comments or directives […]
Query transformation is a key process in the PostgreSQL Cost-Based Optimizer (CBO) that allows the optimizer to modify a user’s SQL query in order to generate a more efficient query plan. In this process, the […]
In PostgreSQL, you can use the Median Absolute Deviation (MAD) to identify outliers in a dataset. MAD is a robust statistic that measures the variability of a dataset, and it is less sensitive to outliers […]
In PostgreSQL, you can use the isnumeric function to identify strings that can be treated as numbers. The isnumeric function returns TRUE if all characters in the string are numeric, and FALSE otherwise. Here is […]
In PostgreSQL, you can use the isalnum function to determine if a string is alphanumeric or not. The isalnum function returns TRUE if all characters in the string are either alphabetic or numeric, and FALSE […]
In PostgreSQL, the maximum number of columns for a table is limited by the system configuration parameter MaxTupleAttributeNumber, which is set to 1664 by default. However, it is possible to increase this limit by modifying […]
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 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 the things to […]
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