PostgreSQL Internals

Online schema changes in PostgreSQL allow you to modify a table’s schema while keeping it available for reads and writes. There are several third-party tools available for implementing online schema changes, such as pg_repack and […]

To implement recursive queries and hierarchical data optimally in PostgreSQL, you can follow these steps: This query selects all the nodes in the hierarchy, along with their name and level. By following these steps, you […]

In PostgreSQL, the track_activity_query_size parameter determines the maximum size of the SQL query that can be recorded in the pg_stat_activity view. By default, this parameter is set to 1024 bytes, which means that only the […]

In PostgreSQL, the WAL (Write-Ahead Logging) is a critical component of the database system that ensures durability and consistency of data. However, frequent WAL writes can impact the performance of the database, especially if the […]

In PostgreSQL, you can implement “as of” queries using the SQL standard’s temporal query features, which allow you to query a table as it existed at a specific point in time. There are two main […]

The cost of a slow query in PostgreSQL can be estimated by the Query Planner, which uses statistics about the data in the tables being queried to make predictions about the query execution time. The […]