Have you ever faced a situation where the Confluence server ran out of space, and you don't know who is uploading the most attachments?
To find this out, access to the PostgreSQL database of Confluence is necessary.
Using an SQL query to the PostgreSQL database, you can obtain useful statistics about Confluence.
Total size of all attachments in Confluence:
SELECT s.spaceid,
s.spacename,
sum(LONGVAL)
FROM contentproperties c
JOIN content co ON c.contentid = co.contentid
JOIN spaces s ON co.spaceid = s.spaceid
WHERE c.contentid IN
(SELECT contentid
FROM content
WHERE contenttype = 'ATTACHMENT')
AND c.propertyname = 'FILESIZE'
GROUP BY s.spaceid
ORDER BY SUM DESC
LIMIT 5;Output (spacename replaced):

Pages with the most historical versions over time:
SELECT title,
MAX(VERSION)
FROM content
WHERE contenttype = 'PAGE'
GROUP BY title
ORDER BY 2 DESC
LIMIT 5;Output:

The largest attachment files in your Confluence instance
SELECT DISTINCT c.contentid,
c.title AS attachmentTitle,
u.username AS uploadedBy,
co.title AS pageTitle,
cn.longval AS bytes
FROM CONTENT AS c
JOIN USER_MAPPING AS u ON u.user_key = c.creator
JOIN CONTENT AS co ON c.pageid = co.contentid
JOIN CONTENTPROPERTIES AS cn ON cn.contentid = c.contentid
WHERE c.contenttype = 'ATTACHMENT'
AND cn.longval IS NOT NULL
ORDER BY cn.longval DESC
LIMIT 5;Output:

Number of pages in the trash and total size of pages in the trash by space:
SELECT Count(content.contentid) AS number_of_trashed_pages,
Pg_size_pretty(SUM(Pg_column_size(bodycontent.BODY))) AS trash_total_size,
spaces.spacename AS space_name
FROM bodycontent
INNER JOIN content ON (content.contentid = bodycontent.contentid)
INNER JOIN spaces ON (content.spaceid = spaces.spaceid)
WHERE bodycontent.contentid IN
(SELECT contentid
FROM content
WHERE content_status = 'deleted'
AND contenttype = 'PAGE')
GROUP BY space_name
ORDER BY trash_total_size
LIMIT 5;Output:

Total size of attachments uploaded by each user on all pages
SELECT u.lower_username,
sum(cp.longval) AS "size"
FROM content c1
JOIN content c2 ON c1.contentid = c2.pageid
JOIN user_mapping u ON c1.creator=u.user_key
JOIN contentproperties cp ON c2.contentid = cp.contentid
WHERE c2.contenttype='ATTACHMENT'
GROUP BY u.lower_username
ORDER BY sum(cp.longval) DESC
LIMIT 5;Output:

P.S. Please supplement the post with useful SQL queries for Confluence
Source: habr.com
