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   1 pg_controldata
   2 ==============
   3
   4 Pl/perlU function to show settings from pg_controldata
   5
   6 Usage
   7 ---------
   8
   9 ```sql
  10 TEST=# SELECT * FROM public.pg_controldata WHERE setting = 'Database system identifier';
  11             name            |       setting
  12 ----------------------------+---------------------
  13  Database system identifier | 5667443312440565226
  14 (1 row)
  15 ```
  16