SQL-Abfragen für PostgreSQL
Mit dem SQL-Tool der Wahl lassen sich gemäß Moodle Datenbankschema Abfragen gestalten.
Konfiguration abfragen per SQL-Befehl
show all;PGSQL-Version
SELECT version();Datenbank-Größen abfragen
Gesamtgröße DB inkl. Index in Byte und GB:
SELECT pg_size_pretty( pg_database_size( 'moodle-dbname' ) ) As human_size, pg_database_size( 'moodle-dbname' ) As byte_size;Tabellengrößen aller Tabellen aufgeschlüsselt nach verschiedenen Werten wie Gesamtgröße und Index:
SELECT *, pg_size_pretty(total_bytes) AS total,
pg_size_pretty(index_bytes) AS INDEX,
pg_size_pretty(toast_bytes) AS toast,
pg_size_pretty(table_bytes) AS TABLE
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,
c.reltuples AS row_estimate,
pg_total_relation_size(c.oid) AS total_bytes,
pg_indexes_size(c.oid) AS index_bytes,
pg_total_relation_size(reltoastrelid) AS toast_bytes,
FROM pg_class c
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE relkind = 'r'
) a
) a;Die 20 größten Tabellen anzeigen, inkl. Indexes und toasted data:
SELECT nspname || '.' || relname AS "relation",
pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
FROM pg_class C
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE nspname NOT IN ('pg_catalog', 'information_schema')
AND C.relkind <> 'i'
AND nspname !~ '^pg_toast'
ORDER BY pg_total_relation_size(C.oid) DESC
LIMIT 20;Tabellengrößen
SELECT pg_size_pretty( pg_total_relation_size('tablename') );- HeidiSQL (in GB inkl. Index): Tabellenübericht
- Pgadmin (in MB, Tabelle/Index separat): links in Navigation unter "tables" die Tabelle auswählen, dann oben Tab "Statistics"
- SQL (in MB inkl. Index):
SELECT pg_size_pretty(pg_total_relation_size('mdl_logstore_lanalytics_log'));
Weiterführende Links
https://docs.moodle.org/en/Custom_SQL_queries_report
https://docs.moodle.org/en/ad-hoc_contributed_reports