Long overdue first commit with content

content/en/blog/miscellaneous/debug-disk-usage-postgresql.md

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+---
+title: "Investigate postgresql disk usage"
+linkTitle: "Investigate postgresql disk usage"
+date: 2015-11-24
+description: >
+  Investigate postgresql disk usage
+---
+
+## How to debug disk occupation in postgresql
+
+- get a database oid number from `ncdu` in `/var/lib/postgresql`
+- reconcile oid number and db name with : `select oid,datname from pg_database where oid=18595;`
+- Then in database : `select table_name,pg_relation_size(quote_ident(table_name)) from information_schema.tables where table_schema = 'public' order by 2;`
+