Created
November 22, 2023 03:08
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Query a Postgres' tables size in bytes
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SELECT l.metric, l.nr AS bytes | |
, CASE WHEN is_size THEN pg_size_pretty(nr) END AS bytes_pretty | |
, CASE WHEN is_size THEN nr / NULLIF(x.ct, 0) END AS bytes_per_row | |
FROM ( | |
SELECT min(tableoid) AS tbl -- = 'public.tbl'::regclass::oid | |
, count(*) AS ct | |
, sum(length(t::text)) AS txt_len -- length in characters | |
FROM {YOUR TABLE} t -- provide table name *once* | |
) x | |
CROSS JOIN LATERAL ( | |
VALUES | |
(true , 'core_relation_size' , pg_relation_size(tbl)) | |
, (true , 'visibility_map' , pg_relation_size(tbl, 'vm')) | |
, (true , 'free_space_map' , pg_relation_size(tbl, 'fsm')) | |
, (true , 'table_size_incl_toast' , pg_table_size(tbl)) | |
, (true , 'indexes_size' , pg_indexes_size(tbl)) | |
, (true , 'total_size_incl_toast_and_indexes', pg_total_relation_size(tbl)) | |
, (true , 'live_rows_in_text_representation' , txt_len) | |
, (false, '------------------------------' , NULL) | |
, (false, 'row_count' , ct) | |
, (false, 'live_tuples' , pg_stat_get_live_tuples(tbl)) | |
, (false, 'dead_tuples' , pg_stat_get_dead_tuples(tbl)) | |
) l(is_size, metric, nr); | |
SELECT octet_length(t.*::text) FROM {YOUR TABLE} AS t; |
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