Rebase after invidious upstream updates

2026-02-14 22:51:42 +01:00 · 2024-08-14 21:22:21 +02:00
parent 5cfc28a527
commit a900a1fa43
42 changed files with 3014 additions and 599 deletions
@@ -0,0 +1,31 @@
+-- Show psql cache hit statistics for prometheus exporter 
+with 
+all_tables as
+(
+SELECT  *
+FROM    (
+    SELECT  'all'::text as table_name, 
+        sum( (coalesce(heap_blks_read,0) + coalesce(idx_blks_read,0) + coalesce(toast_blks_read,0) + coalesce(tidx_blks_read,0)) ) as from_disk, 
+        sum( (coalesce(heap_blks_hit,0)  + coalesce(idx_blks_hit,0)  + coalesce(toast_blks_hit,0)  + coalesce(tidx_blks_hit,0))  ) as from_cache    
+    FROM    pg_statio_USER_tables  --> change to pg_statio_USER_tables if you want to check only user tables (excluding postgres's own tables)
+    ) a
+WHERE   (from_disk + from_cache) > 0 -- discard tables without hits
+),
+tables as 
+(
+SELECT  *
+FROM    (
+    SELECT  relname as table_name, 
+        ( (coalesce(heap_blks_read,0) + coalesce(idx_blks_read,0) + coalesce(toast_blks_read,0) + coalesce(tidx_blks_read,0)) ) as from_disk, 
+        ( (coalesce(heap_blks_hit,0)  + coalesce(idx_blks_hit,0)  + coalesce(toast_blks_hit,0)  + coalesce(tidx_blks_hit,0))  ) as from_cache    
+    FROM    pg_statio_USER_tables --> change to pg_statio_USER_tables if you want to check only user tables (excluding postgres's own tables)
+    ) a
+WHERE   (from_disk + from_cache) > 0 -- discard tables without hits
+)
+SELECT  table_name as "table name",
+    from_disk as "disk hits",
+    round((from_disk::numeric / (from_disk + from_cache)::numeric)*100.0,2) as "% disk hits",
+    round((from_cache::numeric / (from_disk + from_cache)::numeric)*100.0,2) as "% cache hits",
+    (from_disk + from_cache) as "total hits"
+FROM    (SELECT * FROM all_tables UNION ALL SELECT * FROM tables) a
+ORDER   BY (case when table_name = 'all' then 0 else 1 end), "total hits" desc;