| Query goal: | Find the size of base tables without indexes, size of the indexes of the table, total size of the table (including its indexes) and percentage of the index size from the total size. If the size of indexes of a table is relatively high, then check as to whether all the indexes are needed. |
| Query type: | General (Overview of some aspect of the database.) |
| Query license: | MIT License |
| Data source: | system catalog only |
| SQL query: | Click on query to copy it
WITH sizes AS (SELECT nspname AS table_schema, relname AS table_name, Round(pg_table_size(c.oid)::numeric/1024/1024,3) AS table_size_MB, Round(pg_indexes_size(c.oid)::numeric/1024/1024,3) AS index_size_MB, Round(pg_table_size(c.oid)::numeric/1024/1024,3)+Round(pg_indexes_size(c.oid)::numeric/1024/1024,3) AS total_size_MB FROM pg_namespace AS n INNER JOIN pg_authid AS a ON n.nspowner=a.oid INNER JOIN pg_class AS c ON n.oid=c.relnamespace WHERE (n.nspname='public' OR a.rolname<>'postgres') AND relkind='r') SELECT table_schema, table_name, table_size_MB, index_size_MB, total_size_MB, Round(index_size_MB*100/CASE WHEN total_size_MB=0 THEN NULL ELSE total_size_MB END,1) AS index_size_percentage FROM sizes ORDER BY index_size_percentage DESC, table_schema, table_name; |
| Collection name | Collection 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 . |
| Category name | Category description |
|---|---|
| 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. |