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Make it easier to select the query examples in the datanommer doc

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Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>
This commit is contained in:
Pierre-Yves Chibon 2021-02-01 14:53:10 +01:00
parent da5e593171
commit 56a37c5fb7
1 changed files with 14 additions and 12 deletions
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26
docs/datanommer_datagrepper/datanommer.rst
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@ -33,11 +33,12 @@ Here is the size of each table:
::
datanommer=# SELECT
datanommer-# relname as "Table",
datanommer-# pg_size_pretty(pg_total_relation_size(relid)) As "Size",
datanommer-# pg_size_pretty(pg_total_relation_size(relid) - pg_relation_size(relid)) as "External Size"
datanommer-# FROM pg_catalog.pg_statio_user_tables ORDER BY pg_total_relation_size(relid) DESC;
datanommer-#
SELECT
relname as "Table",
pg_size_pretty(pg_total_relation_size(relid)) As "Size",
pg_size_pretty(pg_total_relation_size(relid) - pg_relation_size(relid)) as "External Size"
FROM pg_catalog.pg_statio_user_tables ORDER BY pg_total_relation_size(relid) DESC;
Table | Size | External Size
------------------+------------+---------------
messages | 706 GB | 555 GB
@ -59,13 +60,14 @@ The 3 columns are::
::
datanommer=# SELECT
datanommer-# relname AS objectname,
datanommer-# relkind AS objecttype,
datanommer-# reltuples AS "#entries", pg_size_pretty(relpages::bigint*8*1024) AS size
datanommer-# FROM pg_class
datanommer-# WHERE relpages >= 8
datanommer-# ORDER BY relpages DESC;
datanommer=#
SELECT
relname AS objectname,
relkind AS objecttype,
reltuples AS "#entries", pg_size_pretty(relpages::bigint*8*1024) AS size
FROM pg_class
WHERE relpages >= 8
ORDER BY relpages DESC;
objectname | objecttype | #entries | size
--------------------------------------------+------------+----------------+---------
pg_toast_257488909 | t | 3.4282912e+08 | 440 GB