The current implementation of dbsize doesn't handle tables in

tablespaces correctly, and is quite restricted on objects covered (only
tables and databases, but not tablespaces and indexes).

The attached patch contributes:

- database_size(name)
- relation_size(text)
These are the well-known functions, tablespace-aware.

- pg_tablespace_size(oid)
- pg_database_size(oid)
- pg_relation_size(oid)
Tablespace-aware implementations, used by the upper functions.
pg_relation_size will report sizes of indexes as well.

- pg_size_pretty(bigint)
Formatting of sizes, to display '146MB' instead of '152885668'

Andreas Pflug

contrib/dbsize/dbsize.sql.in

@@ -5,3 +5,19 @@ CREATE FUNCTION database_size (name) RETURNS bigint
 CREATE FUNCTION relation_size (text) RETURNS bigint
     AS 'MODULE_PATHNAME', 'relation_size'
     LANGUAGE C WITH (isstrict);
+
+CREATE FUNCTION pg_tablespace_size(oid) RETURNS bigint
+    AS 'MODULE_PATHNAME', 'pg_tablespace_size'
+    LANGUAGE C STABLE STRICT;
+
+CREATE FUNCTION pg_database_size(oid) RETURNS bigint
+    AS 'MODULE_PATHNAME', 'pg_database_size'
+    LANGUAGE C STABLE STRICT;
+
+CREATE FUNCTION pg_relation_size(oid) RETURNS bigint
+    AS 'MODULE_PATHNAME', 'pg_relation_size'
+    LANGUAGE C STABLE STRICT;
+
+CREATE FUNCTION pg_size_pretty(bigint) RETURNS text
+    AS 'MODULE_PATHNAME', 'pg_size_pretty'
+    LANGUAGE C STABLE STRICT;