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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 […]
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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 […]
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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 […]
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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 […]
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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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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 […]
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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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How can you reduce lock contention in MySQL?
Reducing lock contention in MySQL involves implementing various techniques and strategies that help minimize the occurrence of lock-related performance issues. Here are some of the ways to reduce lock contention in MySQL: By implementing these […]
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What do we look for in a PostgreSQL execution plan?
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 […]