Postgres on aayushprime

Basic Postgres

Fri, 14 Aug 2026 21:04:17 +0545

Pages

Space on disk is used in blocks called pages. (8KB by default)

Tables

List of pages (numbered). eg. page 1-6 => table users Postgres can jump to the table location. Rows are represented by a tuple.

Say, (id, item_id, price) is a row. then, (100, 2000, 300)
This is called a tuple. Actual data that lives in the page on disk.

The entry is represented by a line pointer. (page_no, index_in_the_page)

Recursive CTE

Fri, 14 Aug 2026 21:04:17 +0545

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with recursive all_cte_test as (
 select 1 as a, 2 as b
 union all
 select b, b+1 from all_cte_test
)
select * from all_cte_test limit 10;

It was really surprising to me how this query even stops.