Find the disk size of a PostgreSQL table and its indexes
This article will discuss how to find the disk size of a PostgreSQL table and its indexes.
Find the disk size of PostgreSQL tables and databases using PSQL
You can use \l+to view the database size and use to \d+show table size. But before that, you need to log in to the database to execute the query.
Here are the commands and output for displaying table and database sizes in Postgres:
postgres=# \l+
Output:
postgres-# \d+
List of relations
Schema | Name | Type | Owner | Persistence | Access method | Size | Description
--------+------------------+----------+----------+-------------+---------------+------------+-------------
public | book_lends | table | postgres | permanent | heap | 16 kB |
public | books | table | postgres | permanent | heap | 16 kB |
public | employee | table | postgres | permanent | heap | 16 kB |
public | employee_id_seq | sequence | postgres | permanent | | 8192 bytes |
public | events | table | postgres | permanent | heap | 16 kB |
public | mock_data | table | postgres | permanent | heap | 48 kB |
public | product | table | postgres | permanent | heap | 16 kB |
public | product_id_seq | sequence | postgres | permanent | | 8192 bytes |
public | products | table | postgres | permanent | heap | 16 kB |
public | products_id_seq | sequence | postgres | permanent | | 8192 bytes |
public | prroducts | table | postgres | permanent | heap | 8192 bytes |
public | prroducts_id_seq | sequence | postgres | permanent | | 8192 bytes |
public | stores | table | postgres | permanent | heap | 16 kB |
public | stores_id_seq | sequence | postgres | permanent | | 8192 bytes |
public | users | table | postgres | permanent | heap | 16 kB |
(15 rows)
Here it shows all the tables we have in the Postgres database along with their name, type, owner, size, access method, etc.
Find the size of the largest table in a database
This is a code snippet written by Postgres officials to display table sizes in descending order.
SELECT nspname || '.' || relname AS "relation",
pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
FROM pg_class C
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE nspname NOT IN ('pg_catalog', 'information_schema')
AND C.relkind <> 'i'
AND nspname !~ '^pg_toast'
ORDER BY pg_total_relation_size(C.oid) DESC
LIMIT 10;
Output:
relation | total_size
-------------------+------------
public.mock_data | 48 kB
public.product | 32 kB
public.products | 32 kB
public.books | 32 kB
public.book_lends | 32 kB
public.employee | 32 kB
public.stores | 32 kB
public.users | 32 kB
public.events | 16 kB
public.prroducts | 16 kB
(10 rows)
postgresWe searched for the 10 largest tables under
in the database .
You can click on the following link to know more about disk size queries in Postgres. You will find SQL queries for finding largest cluster, largest relation, partitioned table etc.
More on database size here .
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