du -h --max-depth=1 ./ 

#du -h --max-depth=1 ./
4.0K  ./archive_status
193M  ./

postgres=# select sum(size) from pg_ls_waldir();   
  sum  
-----------
 201326592
(1 row)

postgres=# select count(*) from pg_ls_waldir();
 count 
-------
  12
(1 row)

postgres=# select * from pg_ls_logdir();
        name        | size  |   modification   
----------------------------------+---------+------------------------
 postgresql-2020-04-28_092020.log | 2277343 | 2020-04-29 11:34:56+08
 postgresql-2020-04-28_092020.csv | 140050 | 2020-04-29 11:34:56+08

postgres=# select pg_ls_dir('/data');
   pg_ls_dir    
----------------------

– select * from pg_stat_file('/var/lib/postgresql/9.1/main/pg_xlog/0000000200000BBB000000A9');
– /var/lib/postgresql/9.1/main/pg_xlog
– /var/log/postgresql
– /mnt/nas_dbbackup/archivelog

with tmp_file as (
  select t1.file,
      t1.file_ls,
      (pg_stat_file(t1.file)).size as size,
      (pg_stat_file(t1.file)).access as access,
      (pg_stat_file(t1.file)).modification as last_update_time,
      (pg_stat_file(t1.file)).change as change,
      (pg_stat_file(t1.file)).creation as creation,
      (pg_stat_file(t1.file)).isdir as isdir
   from (select dir||'/'||pg_ls_dir(t0.dir) as file,
          pg_ls_dir(t0.dir) as file_ls
       from ( select '/var/lib/postgresql/9.1/main/pg_xlog'::text as dir
           --需要修改這個物理路徑
           --select '/mnt/nas_dbbackup/archivelog'::text as dir
           --select setting as dir from pg_settings where name='log_directory'
          ) t0
      ) t1 
   where 1=1
   order by (pg_stat_file(file)).modification desc
) 
select to_char(date_trunc('day',tf0.last_update_time),'yyyymmdd') as day_id,
    sum(case when date_part('hour',tf0.last_update_time) >=0 and date_part('hour',tf0.last_update_time) 24 then 1 else 0 end) as wal_num_all,
    sum(case when date_part('hour',tf0.last_update_time) >=0 and date_part('hour',tf0.last_update_time) 1 then 1 else 0 end) as wal_num_00_01,
    sum(case when date_part('hour',tf0.last_update_time) >=1 and date_part('hour',tf0.last_update_time) 2 then 1 else 0 end) as wal_num_01_02,
    sum(case when date_part('hour',tf0.last_update_time) >=2 and date_part('hour',tf0.last_update_time) 3 then 1 else 0 end) as wal_num_02_03,
    sum(case when date_part('hour',tf0.last_update_time) >=3 and date_part('hour',tf0.last_update_time) 4 then 1 else 0 end) as wal_num_03_04,
    sum(case when date_part('hour',tf0.last_update_time) >=4 and date_part('hour',tf0.last_update_time) 5 then 1 else 0 end) as wal_num_04_05,
    sum(case when date_part('hour',tf0.last_update_time) >=5 and date_part('hour',tf0.last_update_time) 6 then 1 else 0 end) as wal_num_05_06,
    sum(case when date_part('hour',tf0.last_update_time) >=6 and date_part('hour',tf0.last_update_time) 7 then 1 else 0 end) as wal_num_06_07,
    sum(case when date_part('hour',tf0.last_update_time) >=7 and date_part('hour',tf0.last_update_time) 8 then 1 else 0 end) as wal_num_07_08,
    sum(case when date_part('hour',tf0.last_update_time) >=8 and date_part('hour',tf0.last_update_time) 9 then 1 else 0 end) as wal_num_08_09,
    sum(case when date_part('hour',tf0.last_update_time) >=9 and date_part('hour',tf0.last_update_time) 10 then 1 else 0 end) as wal_num_09_10,
    sum(case when date_part('hour',tf0.last_update_time) >=10 and date_part('hour',tf0.last_update_time) 11 then 1 else 0 end) as wal_num_10_11,
    sum(case when date_part('hour',tf0.last_update_time) >=11 and date_part('hour',tf0.last_update_time) 12 then 1 else 0 end) as wal_num_11_12,
    sum(case when date_part('hour',tf0.last_update_time) >=12 and date_part('hour',tf0.last_update_time) 13 then 1 else 0 end) as wal_num_12_13,
    sum(case when date_part('hour',tf0.last_update_time) >=13 and date_part('hour',tf0.last_update_time) 14 then 1 else 0 end) as wal_num_13_14,
    sum(case when date_part('hour',tf0.last_update_time) >=14 and date_part('hour',tf0.last_update_time) 15 then 1 else 0 end) as wal_num_14_15,
    sum(case when date_part('hour',tf0.last_update_time) >=15 and date_part('hour',tf0.last_update_time) 16 then 1 else 0 end) as wal_num_15_16,
    sum(case when date_part('hour',tf0.last_update_time) >=16 and date_part('hour',tf0.last_update_time) 17 then 1 else 0 end) as wal_num_16_17,
    sum(case when date_part('hour',tf0.last_update_time) >=17 and date_part('hour',tf0.last_update_time) 18 then 1 else 0 end) as wal_num_17_18,
    sum(case when date_part('hour',tf0.last_update_time) >=18 and date_part('hour',tf0.last_update_time) 19 then 1 else 0 end) as wal_num_18_19,
    sum(case when date_part('hour',tf0.last_update_time) >=19 and date_part('hour',tf0.last_update_time) 20 then 1 else 0 end) as wal_num_19_20,
    sum(case when date_part('hour',tf0.last_update_time) >=20 and date_part('hour',tf0.last_update_time) 21 then 1 else 0 end) as wal_num_20_21,
    sum(case when date_part('hour',tf0.last_update_time) >=21 and date_part('hour',tf0.last_update_time) 22 then 1 else 0 end) as wal_num_21_22,
    sum(case when date_part('hour',tf0.last_update_time) >=22 and date_part('hour',tf0.last_update_time) 23 then 1 else 0 end) as wal_num_22_23, 
    sum(case when date_part('hour',tf0.last_update_time) >=23 and date_part('hour',tf0.last_update_time) 24 then 1 else 0 end) as wal_num_23_24
from tmp_file tf0
where 1=1
 and tf0.file_ls not in ('archive_status')
group by to_char(date_trunc('day',tf0.last_update_time),'yyyymmdd')
order by to_char(date_trunc('day',tf0.last_update_time),'yyyymmdd') desc
;