Goal This query identifies B-tree indexes where the FILLFACTOR has been explicitly set to 90. Since 90 is the default FILLFACTOR for B-tree indexes in PostgreSQL, this explicit declaration is superfluous. Removing such redundant settings simplifies the schema definition, improves maintainability, and makes intentionally non-default configurations more apparent.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability Low (Many false-positive results)
License MIT (opens in new tab)
Fixing Suggestion If you create a new B-tree index, then setting FILLFACTOR explicitly to 90 is not needed. Of course it could also be that fillfactor was something different and now it is reset. In this case everything is OK.
Data Source system catalog only
SQL Query 
WITH indexes_reloptions AS (SELECT 
  pg_class.relname AS index_name, 
  pg_namespace.nspname AS index_schema,
amname AS index_type,
unnest(reloptions) AS reloptions,
pg_get_indexdef(pg_class.oid) AS index_definition
FROM 
  pg_catalog.pg_class, 
  pg_catalog.pg_namespace,
pg_am
WHERE 
  pg_class.relnamespace = pg_namespace.oid 
AND pg_class.relam=pg_am.oid
AND relkind='i')
SELECT index_name, index_schema, index_type, reloptions, index_definition
FROM indexes_reloptions
WHERE index_type='btree' AND reloptions LIKE '%fillfactor=90%'
ORDER BY index_name;

Collections

This query belongs to the following collections:

Find problems automatically

Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

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 .

NameDescription
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .
Find problems by overviewQueries 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:

Data at the database physical level

Queries of this category provide information about the disk usage.

Performance

Queries of this category provide information about indexes in a database.

NameDescription
Data at the database physical levelQueries of this category provide information about the disk usage.
PerformanceQueries of this category provide information about indexes in a database.