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July 23, 2018 13:15
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Script to measure the size of Postgres Table row and Data page
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WITH cteTableInfo AS | |
( | |
SELECT | |
COUNT(1) AS ct | |
,SUM(length(t::text)) AS TextLength | |
,'PUBLIC.MY_TABLE'::regclass AS TableName | |
FROM PUBLIC.MY_TABLE AS t | |
) | |
,cteRowSize AS | |
( | |
SELECT ARRAY [pg_relation_size(TableName) | |
, pg_relation_size(TableName, 'vm') | |
, pg_relation_size(TableName, 'fsm') | |
, pg_table_size(TableName) | |
, pg_indexes_size(TableName) | |
, pg_total_relation_size(TableName) | |
, TextLength | |
] AS val | |
, ARRAY ['Total Relation Size' | |
, 'Visibility Map' | |
, 'Free Space Map' | |
, 'Table Included Toast Size' | |
, 'Indexes Size' | |
, 'Total Toast and Indexes Size' | |
, 'Live Row Byte Size' | |
] AS Name | |
FROM cteTableInfo | |
) | |
SELECT | |
unnest(name) AS Description | |
,unnest(val) AS Bytes | |
,pg_size_pretty(unnest(val)) AS BytesPretty | |
,unnest(val) / ct AS bytes_per_row | |
FROM cteTableInfo, cteRowSize | |
UNION ALL SELECT '------------------------------', NULL, NULL, NULL | |
UNION ALL SELECT 'TotalRows', ct, NULL, NULL FROM cteTableInfo | |
UNION ALL SELECT 'LiveTuples', pg_stat_get_live_tuples(TableName), NULL, NULL FROM cteTableInfo | |
UNION ALL SELECT 'DeadTuples', pg_stat_get_dead_tuples(TableName), NULL, NULL FROM cteTableInfo; |
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