Find base tables in case of which toast_tuple_target storage parameter value is not the default value (2040). "Changing this value may not be useful for very short or very long rows. Note that the default setting is often close to optimal, and it is possible that setting this parameter could have negative effects in some cases. " Make sure that the parameter has an optimal value.
Type
General (Overview of some aspect of the database.)
WITH base_tables AS (SELECT
pg_class.oid AS table_oid,
pg_class.relname AS table_name,
pg_namespace.nspname AS table_schema,
unnest(reloptions) AS reloptions
FROM
pg_catalog.pg_class,
pg_catalog.pg_namespace
WHERE
pg_class.relnamespace = pg_namespace.oid AND relkind='r'),
base_tables_fillfactor AS (SELECT table_oid, table_schema, table_name, regexp_replace(reloptions,'[^0-9]','','g')::int AS toast_tuple_target
FROM base_tables
WHERE table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
AND reloptions ILIKE 'toast_tuple_target%')
SELECT table_schema, table_name, toast_tuple_target,
(SELECT Count(*) AS cnt
FROM pg_attribute AS a
WHERE a.attrelid=btf.table_oid
AND a.attisdropped = false
AND a.attnum>=1) AS number_of_columns
FROM base_tables_fillfactor AS btf
WHERE toast_tuple_target<>2040
ORDER BY table_schema, table_name;
Collections
This query belongs to the following collections:
Name
Description
Find problems by overview
Queries that results point to different aspects of database that might have problems. A human reviewer has to decide based on the results as to whether there are problems or not .
Categories
This query is classified under the following categories:
Name
Description
Data at the database physical level
Queries of this category provide information about the disk usage.
TOAST
Queries of this category provide information about The Oversized-Attribute Storage Technique.