Introduction In previous blogs, we talked about an overview of PostgreSQL’s table access method API here , how sequential scan is handled within this API here, and how data insertion is handled here. Today in this blog, we will look closely into how PostgreSQL handles update. A successful update in PostgreSQL can be viewed as “insert a new…
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1. Introduction This blog talks about a high level description of the mechanism behind PostgreSQL to execute an INSERT query. This process involves many steps of processing before the data is put in the right place. These process normally involves several catalog cache lookup to determine if the destination table exists or several checking on…
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1. Introduction There are many approaches for PostgreSQL to retrieve the data back to the user. Depending on the user’s input query, the planner module is responsible for selecting the most optimum approach to retrieve the requested data. Sequential scan is one of these approaches that is mostly selected when the user requests a large…
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