add edb 表大小查询

postgresql_and_edb/edb表空间查询.md

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+```sql
+SELECT nspname || '.' || relname AS "relation",
+               pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
+        FROM pg_class C
+        LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
+        WHERE nspname NOT IN ('pg_catalog', 'information_schema')
+        AND C.relkind = 'r'
+        ORDER BY pg_total_relation_size(C.oid) DESC;
+```
+
+
+
+
+
+
+
+```sql
+ SELECT schemaname || '.' || relname AS "relation",
+               pg_size_pretty(pg_total_relation_size(relid)) AS "total_size",
+               pg_size_pretty(pg_table_size(relid) - pg_indexes_size(relid)) AS "table_size",
+               pg_size_pretty(pg_indexes_size(relid)) AS "index_size",
+               n_dead_tup
+        FROM pg_stat_user_tables
+        WHERE n_dead_tup > 0
+        ORDER BY n_dead_tup DESC;
+```
+