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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 […]

Simple steps for implementing optimal SQL programs in PostgreSQL

The SQL parser in PostgreSQL is implemented using a combination of lexical analysis, syntax analysis, semantic analysis, and code generation. The parser first converts the input SQL text into tokens, and then performs syntax and […]

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, […]

The InnoDB history list length increased significantly – What to do next?

Introduction The InnoDB history list length can grow significantly if there are long-running transactions that generate a lot of undo logs or if there are frequent transactions with large amounts of data being modified. This […]

Tuning UNDO Operations in MySQL

In MySQL, undo operations are used to provide transactional consistency and to allow for rolling back changes made to the database during a transaction. Undo operations are implemented in the InnoDB storage engine, which is […]

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