Redo and Undo are essential components of any database management system, including PostgreSQL. Redo and Undo are used to maintain the consistency and durability of the database by enabling the recovery of transactions in the […]
Partial indexes in PostgreSQL allow you to create an index on a subset of a table’s rows that meet a certain condition. This can be useful for improving query performance on a subset of data […]
PostgreSQL 16 introduced several enhancements to the JSON data type constructor, which is used to create JSON data structures in the database. Some of the key enhancements include: These enhancements to the JSON data type […]
PostgreSQL’s JSONB data type allows you to store arbitrary JSON data in a structured format. This can be useful for storing data that does not fit neatly into a traditional relational database schema, such as […]
PostgreSQL uses a “multi-version concurrency control” (MVCC) approach to ensure that shared locks don’t starve requests for exclusive or update locks. Under MVCC, each transaction works with a “snapshot” of the database state at a […]
In PostgreSQL 16, you can reserve connections for the pg_use_reserved_connections group by modifying the postgresql.conf file. The pg_use_reserved_connections group is a special group of connections that are reserved for superusers and other critical system processes, […]
Large indexes in PostgreSQL can corrupt execution plans by causing the query planner to choose suboptimal plans due to the cost of scanning the large index. When the size of an index exceeds the effective_cache_size […]
PostgreSQL 15 introduced a new feature called “asynchronous commit”, which can help reduce replication lag by allowing multiple transactions to be committed concurrently. This feature works by allowing the server to continue processing new transactions […]
Thread contention in PostgreSQL occurs when multiple threads are competing for the same resources, such as CPU time, disk I/O, or database locks. This can lead to performance degradation, slower response times, and even database […]
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 […]
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