In PostgreSQL, the catalog tables are system tables that store metadata information about the database objects such as tables, indexes, functions, and users. The catalog tables can be used to troubleshoot contention issues by providing […]
In PostgreSQL, shared buffers serve as the shared memory pool used to cache data pages in memory to improve read performance. Whenever a query needs to access data, it checks if the required pages are […]
In PostgreSQL, if explicit locking is not enforced, duplicate records can be inserted when multiple concurrent transactions try to insert the same record simultaneously. This can occur when two or more transactions are executed concurrently […]
In PostgreSQL, errors inside a transaction can also be handled using savepoints. A savepoint is a point within a transaction that can be rolled back, without rolling back the entire transaction. Here is an example […]
Using OR logic in outer joins can have a significant impact on PostgreSQL performance, especially when joining large tables. Here are a few factors to consider: To mitigate the impact of OR logic on PostgreSQL […]
When deleting records from a table that are referenced by other tables in PostgreSQL, there are several ways to ensure that the deletion is performed optimally and does not violate any foreign key constraints. Here […]
The I/O subsystem is a critical component of PostgreSQL, responsible for reading and writing data to and from disk. Here is an overview of the anatomy of PostgreSQL’s I/O subsystem: Monitoring the I/O subsystem is […]
Plan Cache Based Execution Statistics is a feature in PostgreSQL that collects and aggregates execution statistics for SQL statements that are stored in the plan cache. This allows users to monitor and analyze the performance […]
PostgreSQL provides three transaction isolation levels, which control the visibility of changes made by concurrent transactions. PostgreSQL Locks: PostgreSQL uses various types of locks to ensure data consistency in concurrent environments. Locks can influence performance […]
PostgreSQL provides a powerful statistics collection system that can be used to gather information about the behavior of the database system. This information can be used to diagnose performance problems, optimize queries, and tune the […]
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