Greenplum is a based on MVCC architecture that means user’s action like UPDATE will insert a new record in a database.
Greenplum Data warehouse can manage billions of data, but it doesn’t mean that user can generate or UPDATE random data set.
Periodically, The Greenplum DBA should check the size of database schemas and their appropriate usage.

In this post, I shared different scripts to check the size of Greenplum Database Schemas.

Option 1:

select *
from gp_toolkit.gp_size_of_schema_disk;

Option 2:

select
	schemaname
	,round(sum(pg_total_relation_size(schemaname||'.'||tablename))) SchemaSize
from pg_tables group by 1;

Option 3:

SELECT
	schema_name
	,pg_size_pretty(sum(table_size)::bigint)
FROM
(
	SELECT pg_catalog.pg_namespace.nspname as schema_name,
	pg_relation_size(pg_catalog.pg_class.oid) as table_size
	FROM pg_catalog.pg_class
	JOIN pg_catalog.pg_namespace ON relnamespace = pg_catalog.pg_namespace.oid
) t
GROUP BY schema_name
ORDER BY schema_name;

In this post, I am sharing one SQL Script to find the size of all your PostgreSQL Databases.

I am sharing this kind of script because It helps a lot for reporting and monitoring Database Server.

Recently, I have used this script to generate all database size reports because suddenly one of our PostgreSQL Server increased utilization of the Disk.

Using pg_catalog.pg_database, I am finding the size of Databases.
Below is a script:

SELECT 
	datname AS DatabaseName
	,pg_catalog.pg_get_userbyid(datdba) AS OwnerName
	,CASE 
		WHEN pg_catalog.has_database_privilege(datname, 'CONNECT')
		THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(datname))
		ELSE 'No Access For You'
	END AS DatabaseSize
FROM pg_catalog.pg_database
ORDER BY 
	CASE 
		WHEN pg_catalog.has_database_privilege(datname, 'CONNECT')
		THEN pg_catalog.pg_database_size(datname)
		ELSE NULL
	END DESC;

In this post, I am sharing a SQL Script to find the size of Database Files and Log Files in SQL Server.

I am calculating the size using sys.master_files and performing the required division to get size in MB and GB because it is returning 8 KB pages.

The Database Administrator can use this script to get the quick size of Database Files and Log Files of a SQL Server.
SQL Server Management Studio also provides GUI tools for this exercise, but still, I always use a different script to do my DBA task.

SELECT 
    db_name(database_id) AS DatabaseName
    ,type_desc AS TypeDesc
    ,(size * 8) /1024 AS SizeInMB
    ,(size * 8) /1024/1024 AS SizeInGB
FROM sys.master_files 
ORDER BY name