How did pg_relation_size locate something does not exist in the db?
VCDB=# select current_database(), version();
current_database | version
------------------+---------------------------------------------------------------------------------------------------------------
-----------------------------------
VCDB | PostgreSQL 9.4.9 (VMware Postgres 9.4.9.1-4536683 release) on x86_64-unknown-linux-gnu, compiled by x86_64-vmk
-linux-gnu-gcc (GCC) 4.8.4, 64-bit
(1 row)
VCDB=# select pg_relation_size(table_name) as Size FROM information_schema.tables WHERE table_schema NOT IN ('information_schema', 'pg_catalog') ORDER BY size DESC LIMIT 10;
ERROR: relation "vci_version" does not exist
VCDB=# \d vci_version;
Did not find any relation named "vci_version".
VCDB=#
VCDB=# select table_name FROM information_schema.tables WHERE table_schema NOT IN ('information_schema', 'pg_catalog');
table_name
--------------------------------
cis_kv_providers
cis_kv_keyvalue
vpx_alarm_expression
vpx_alarm_expr_comp
vpx_alarm
...
SELECT tablename, pg_size_pretty(pg_relation_size(schemaname || '.' || tablename))
FROM pg_tables WHERE schemaname = 'vc';
tablename | pg_size_pretty
--------------------------------+----------------
cis_kv_providers | 8192 bytes
cis_kv_keyvalue | 8192 bytes
vpx_alarm_expression | 112 kB
vpx_alarm_expr_comp | 48 kB
vpx_alarm | 104 kB
vpx_alarm_runtime | 8192 bytes
