Come trovare la dimensione del disco di una tabella Postgres / PostgreSQL e i suoi indici

Sto venendo a Postgres da Oracle e sto cercando un modo per trovare la tabella e la dimensione dell'indice in termini di bytes/MB/GB/etc, o anche meglio, la dimensione per tutte le tabelle. In Oracle ho avuto una brutta lunga query che ha esaminato user_lobs e user_segments per dare una risposta.

Presumo che in Postgres ci sia qualcosa che posso usare nelle information_schematabelle, ma non vedo dove.

Prova le funzioni Dimensione oggetto database . Un esempio:

SELECT pg_size_pretty(pg_total_relation_size('"<schema>"."<table>"'));

Per tutte le tabelle, qualcosa sulla falsariga di:

SELECT
    table_schema || '.' || table_name AS table_full_name,
    pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS size
FROM information_schema.tables
ORDER BY
    pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC;

Modifica: ecco la query inviata da @phord, per comodità:

SELECT
    table_name,
    pg_size_pretty(table_size) AS table_size,
    pg_size_pretty(indexes_size) AS indexes_size,
    pg_size_pretty(total_size) AS total_size
FROM (
    SELECT
        table_name,
        pg_table_size(table_name) AS table_size,
        pg_indexes_size(table_name) AS indexes_size,
        pg_total_relation_size(table_name) AS total_size
    FROM (
        SELECT ('"' || table_schema || '"."' || table_name || '"') AS table_name
        FROM information_schema.tables
    ) AS all_tables
    ORDER BY total_size DESC
) AS pretty_sizes;

L'ho modificato leggermente per pg_table_size()includere metadati e aumentare le dimensioni.

Mostra dimensioni database:

\l+

per esempio

=> \l+
 berbatik_prd_commerce    | berbatik_prd     | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 19 MB   | pg_default | 
 berbatik_stg_commerce    | berbatik_stg     | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 8633 kB | pg_default | 
 bursasajadah_prd         | bursasajadah_prd | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                       | 1122 MB | pg_default | 

Mostra dimensioni tavolo:

\d+

per esempio

=> \d+
 public | tuneeca_prd | table | tomcat | 8192 bytes | 
 public | tuneeca_stg | table | tomcat | 1464 kB    | 

Funziona solo in psql.

(Riepilogo della risposta di @ zkutch .)

Se il nome del database è snort, la seguente frase indica la dimensione:

psql -c "\l+ snort" | awk -F "|" '{print $7}'

Tyr this: (dimensioni dell'indice / statistiche sull'utilizzo)

SELECT
    t.tablename,
    indexname,
    c.reltuples AS num_rows,
    pg_size_pretty(pg_relation_size(quote_ident(t.tablename)::text)) AS table_size,
    pg_size_pretty(pg_relation_size(quote_ident(indexrelname)::text)) AS index_size,
    CASE WHEN indisunique THEN 'Y'
       ELSE 'N'
    END AS UNIQUE,
    idx_scan AS number_of_scans,
    idx_tup_read AS tuples_read,
    idx_tup_fetch AS tuples_fetched
FROM pg_tables t
LEFT OUTER JOIN pg_class c ON t.tablename=c.relname
LEFT OUTER JOIN
    ( SELECT c.relname AS ctablename, ipg.relname AS indexname, x.indnatts AS number_of_columns, idx_scan, idx_tup_read, idx_tup_fetch, indexrelname, indisunique FROM pg_index x
           JOIN pg_class c ON c.oid = x.indrelid
           JOIN pg_class ipg ON ipg.oid = x.indexrelid
           JOIN pg_stat_all_indexes psai ON x.indexrelid = psai.indexrelid )
    AS foo
    ON t.tablename = foo.ctablename
WHERE t.schemaname='public'
ORDER BY 1,2;

Le tabelle PostgreSQL hanno tre componenti: la tabella stessa, eventuali indici su di essa e dati potenzialmente TOAST. Ci sono un paio di esempi che mostrano come far scorrere e tagliare le informazioni disponibili in vari modi su http://wiki.postgresql.org/wiki/Disk_Usage

Solo per informazioni, ho ricevuto l'eccellente risposta da @aib e l'ho modificata un po 'per:

• ottenere solo tabelle dallo schema "pubblico"
• mostra anche i dati delle viste materializzate e le dimensioni dell'indice

Nella vista materializzata possiamo usare l'indice per aggiornare contemporaneamente le viste materializzate , il che consente di usarle durante l'aggiornamento.

Bene, la mia domanda sarà la seguente:

SELECT
    table_name,
    pg_size_pretty(table_size) AS table_size,
    pg_size_pretty(indexes_size) AS indexes_size,
    pg_size_pretty(total_size) AS total_size
FROM (
    SELECT
        table_name,
        pg_table_size(table_name) AS table_size,
        pg_indexes_size(table_name) AS indexes_size,
        pg_total_relation_size(table_name) AS total_size
    FROM (
        -- tables from 'public'
        SELECT table_name
        FROM information_schema.tables
        where table_schema = 'public' and table_type = 'BASE TABLE'
        union
        -- materialized views
        SELECT oid::regclass::text as table_name
        FROM pg_class
        WHERE relkind = 'm'
        order by table_name
    ) AS all_tables
    -- ORDER BY total_size DESC
    order by table_name
) AS pretty_sizes

La seguente query ti servirà

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;

Vedi questo link: https://wiki.postgresql.org/wiki/Disk_Usage

controlla questa wiki. https://wiki.postgresql.org/wiki/Disk_Usage

SELEZIONA *, pg_size_pretty (total_bytes) AS totale
    , pg_size_pretty (index_bytes) COME INDICE
    , pg_size_pretty (toast_bytes) AS toast
    , pg_size_pretty (table_bytes) COME TABELLA
  A PARTIRE DAL (
  SELEZIONA *, total_bytes-index_bytes-COALESCE (toast_bytes, 0) AS table_bytes FROM (
      SELEZIONA 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
          DA pg_class c
          LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
          DOVE relkind = 'r'
  ) a
) a

Prova questo script per trovare tutte le dimensioni della tabella:

SELECT
    table_schema || '.' || table_name AS TableName,
    pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS TableSize
FROM information_schema.tables
ORDER BY
    pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC

Per altri script diversi per trovare le dimensioni in PostgreSQL, visitare questo URL: http://www.dbrnd.com/2015/05/how-to-find-size-of-database-and-table-in-postgresql/