SQL-Abfragen

Mit dem SQL-Tool der Wahl lassen sich gemäß Moodle Datenbankschema Abfragen gestalten.

Konfiguration abfragen per SQL-Befehl: 

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

https://moodle.org/plugins/block_configurable_reports

https://docs.moodle.org/en/Report_builder