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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-data-service metrics)
#:use-module (ice-9 match)
#:use-module (squee)
#:export (fetch-high-level-table-size-metrics
fetch-pg-stat-user-tables-metrics
fetch-pg-stat-user-indexes-metrics
fetch-pg-stats-metrics))
(define (fetch-high-level-table-size-metrics conn)
;; Adapted from https://wiki.postgresql.org/wiki/Disk_Usage
(define query
"
WITH RECURSIVE pg_inherit(inhrelid, inhparent) AS (
SELECT inhrelid, inhparent
FROM pg_inherits
UNION
SELECT child.inhrelid, parent.inhparent
FROM pg_inherit child, pg_inherits parent
WHERE child.inhparent = parent.inhrelid
), pg_inherit_short AS (
SELECT *
FROM pg_inherit
WHERE inhparent NOT IN (SELECT inhrelid FROM pg_inherit)
)
SELECT table_name,
COALESCE(pg_tablespace.spcname,'default') AS tablespace,
row_estimate,
table_bytes,
toast_bytes
FROM (
SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes
FROM (
SELECT c.oid,
nspname AS table_schema,
relname AS table_name,
reltablespace AS tablespace_id,
SUM(c.reltuples) OVER (partition BY parent) AS row_estimate,
SUM(pg_total_relation_size(c.oid)) OVER (partition BY parent) AS total_bytes,
SUM(pg_indexes_size(c.oid)) OVER (partition BY parent) AS index_bytes,
SUM(pg_total_relation_size(reltoastrelid)) OVER (partition BY parent) AS toast_bytes,
parent
FROM (
SELECT pg_class.oid,
reltuples,
relname,
relnamespace,
reltablespace,
pg_class.reltoastrelid,
COALESCE(inhparent, pg_class.oid) parent
FROM pg_class
LEFT JOIN pg_inherit_short ON inhrelid = oid
WHERE relkind IN ('r', 'p')
) c
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
) a
WHERE oid = parent
AND table_schema = 'guix_data_service'
) a
LEFT JOIN pg_tablespace ON tablespace_id = pg_tablespace.oid")
(map (match-lambda
((name tablespace row-estimate table-bytes toast-bytes)
(list name
tablespace
(or (string->number (or row-estimate "")) 0)
(or (string->number (or table-bytes "")) 0)
(or (string->number (or toast-bytes "")) 0))))
(exec-query conn query)))
(define (fetch-pg-stat-user-tables-metrics conn)
(define query
"
SELECT relname, seq_scan, seq_tup_read,
COALESCE(idx_scan, 0), COALESCE(idx_tup_fetch, 0),
n_tup_ins, n_tup_upd, n_tup_del, n_tup_hot_upd,
n_live_tup, n_dead_tup, n_mod_since_analyze,
COALESCE(extract(epoch from last_vacuum), 0),
COALESCE(extract(epoch from last_autovacuum), 0),
COALESCE(extract(epoch from last_analyze), 0),
COALESCE(extract(epoch from last_autoanalyze), 0),
vacuum_count, autovacuum_count, analyze_count, autoanalyze_count
FROM pg_stat_user_tables
WHERE relname NOT LIKE 'package_derivations_by_guix_revision_range_git_branch_%'")
(map (match-lambda
((relname seq-scan seq-tup-read
idx-scan idx-tup-fetch
n-tup-ins n-tup-upd n-tup-del n-tup-hot-upd
n-live-tup n-dead-tup n-mod-since-analyze
last-vacuum last-autovacuum last-analyze last-autoanalyze
vacuum-count autovacuum-count analyze-count autoanalyze-count)
`((name . ,relname)
(seq-scan . ,seq-scan)
(seq-tup-read . ,seq-tup-read)
(idx-scan . ,idx-scan)
(idx-tup-fetch . ,idx-tup-fetch)
(n-tup-ins . ,n-tup-ins)
(n-tup-upd . ,n-tup-upd)
(n-tup-del . ,n-tup-del)
(n-tup-hot-upd . ,n-tup-hot-upd)
(n-live-tup . ,n-live-tup)
(n-dead-tup . ,n-dead-tup)
(n-mod-since-analyze . ,n-mod-since-analyze)
(last-vacuum . ,last-vacuum)
(last-autovacuum . ,last-autovacuum)
(last-analyze . ,last-analyze)
(last-autoanalyze . ,last-autoanalyze)
(vacuum-count . ,vacuum-count)
(autovacuum-count . ,autovacuum-count)
(analyze-count . ,analyze-count)
(autoanalyze-count . ,autoanalyze-count))))
(exec-query conn query)))
(define (fetch-pg-stat-user-indexes-metrics conn)
(define query
"
SELECT pg_indexes.indexname,
pg_indexes.tablename,
COALESCE(pg_indexes.tablespace,'default') AS tablespace,
pg_stat_user_indexes.idx_scan,
pg_stat_user_indexes.idx_tup_read,
pg_stat_user_indexes.idx_tup_fetch,
pg_relation_size(indexrelid) AS size_in_bytes
FROM pg_stat_user_indexes
LEFT JOIN pg_indexes
ON pg_stat_user_indexes.indexrelname = pg_indexes.indexname
AND pg_stat_user_indexes.schemaname = pg_indexes.schemaname
WHERE pg_stat_user_indexes.schemaname = 'guix_data_service'
AND pg_indexes.tablename NOT LIKE 'package_derivations_by_guix_revision_range_git_branch_%'")
(map
(match-lambda
((indexname tablename tablespace
idx_scan idx_tup_read idx_tup_fetch
size_in_bytes)
`((name . ,indexname)
(table-name . ,tablename)
(tablespace . ,tablespace)
(idx-scan . ,idx_scan)
(idx-tup-read . ,idx_tup_read)
(idx-tup-fetch . ,idx_tup_fetch)
(bytes . ,size_in_bytes))))
(exec-query conn query)))
(define (fetch-pg-stats-metrics conn)
(define query
"
SELECT tablename, attname, null_frac, n_distinct, correlation
FROM pg_stats
WHERE schemaname = 'guix_data_service'
AND tablename NOT LIKE 'package_derivations_by_guix_revision_range_git_branch_%'")
(map
(match-lambda
((tablename attname null_frac n_distinct correlation)
`((table-name . ,tablename)
(column-name . ,attname)
(null-frac . ,(string->number null_frac))
(n-distinct . ,(string->number n_distinct))
(correlation . ,(and=> correlation string->number)))))
(exec-query conn query)))
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