Add 'PostgreSQL/description/table_size_detail.sql'

PostgreSQL/description/table_size_detail.sql

@@ -0,0 +1,41 @@
+WITH RECURSIVE pg_inherit(inhrelid, inhparent) AS
+    (select inhrelid, inhparent
+    FROM pg_inherits
+    UNION
+    SELECT child.inhrelid, parent.inhparent
+    FROM pg_inherit child, pg_inherits parent
+    WHERE child.inhparent = parent.inhrelid),
+pg_inherit_short AS (SELECT * FROM pg_inherit WHERE inhparent NOT IN (SELECT inhrelid FROM pg_inherit))
+SELECT TABLE_NAME
+    , row_estimate
+    , cast(total_bytes/1024/1024 as numeric(12,2)) AS total
+    , cast(table_bytes/1024/1024 as numeric(12,2)) AS table
+    , cast(toast_bytes/1024/1024 as numeric(12,2)) AS toast
+    , cast(index_bytes/1024/1024 as numeric(12,2)) AS index
+  FROM (
+    SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes
+    FROM (
+         SELECT c.oid
+              , relname AS TABLE_NAME
+              , SUM(c.reltuples) OVER (partition BY parent) AS row_estimate
+              , SUM(pg_total_relation_size(c.oid)) OVER (partition BY parent) AS total_bytes
+              , SUM(pg_indexes_size(c.oid)) OVER (partition BY parent) AS index_bytes
+              , SUM(pg_total_relation_size(reltoastrelid)) OVER (partition BY parent) AS toast_bytes
+              , parent
+          FROM (
+                SELECT pg_class.oid
+                    , reltuples
+                    , relname
+                    , relnamespace
+                    , pg_class.reltoastrelid
+                    , COALESCE(inhparent, pg_class.oid) parent
+                FROM pg_class
+                    LEFT JOIN pg_inherit_short ON inhrelid = oid
+                WHERE relkind IN ('r', 'p', 'm')
+             ) c
+             LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
+        WHERE nspname NOT IN ('pg_catalog','information_schema')
+  ) a
+  WHERE oid = parent
+) a
+ORDER BY total_bytes DESC;