In this post, I am sharing a script to find a list of Append Only or Append Optimized tables of Greenplum.

Before Greenplum 4.3, when you create Append only table, you can only perform insert and select on that table.
But from Greenplum 4.3, now you can perform UPDATE as well but still Append Only is efficient storage.

The Append Only tables are faster and also it reduces the disk usage by compressing the data size. You can use below script to find a list of Append only tables.

SELECT   
	b.nspname||'.'||a.relname as TableName
	,case c.columnstore
		when 'f' then 'Row Orientation'        
		when 't' then 'Column Orientation'
	end as TableStorageType
	,case COALESCE(c.compresstype,'')
		when '' then 'No Compression'        
		else c.compresstype
	end as CompressionType
FROM pg_class a
,pg_namespace b
,(select relid,segrelid,segidxid,columnstore,compresstype from pg_appendonly) c
WHERE b.oid=a.relnamespace
	and a.oid=c.relid