Query goal: | Find columns of base tabels and materialized views with the type tsvector that do not have a gin or a gist index but have another type of index (e.g., b-tree). Gin and Gist are the preferred index types for text search. |
Query type: | Problem detection (Each row in the result could represent a flaw in the design) |
Query reliability: | Medium (Medium number of false-positive results) |
Query license: | MIT License |
Fixing suggestion: | Drop the index. |
Data source: | INFORMATION_SCHEMA+system catalog |
SQL query: | Click on query to copy it
WITH columns AS (SELECT nspname AS table_schema, relname AS table_name, CASE WHEN relkind='r' THEN 'BASE TABLE' WHEN relkind='m' THEN 'MATERIALIZED VIEW' END AS table_type, attname AS column_name, coalesce(domain_type.typname, pg_type.typname) AS data_type FROM pg_class INNER JOIN pg_namespace ON pg_class.relnamespace=pg_namespace.oid INNER JOIN pg_attribute ON pg_class.oid=pg_attribute.attrelid INNER JOIN pg_type ON pg_attribute.atttypid =pg_type.oid LEFT JOIN pg_type AS domain_type ON domain_type.oid=pg_type.typbasetype WHERE attnum>=1 AND relkind IN ('r','m') AND nspname NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL)), text_search_cols AS (SELECT table_schema, table_name, table_type, array_agg(column_name::text) AS column_name FROM columns WHERE data_type IN ('tsvector') GROUP BY table_schema, table_name, table_type), idx AS (SELECT n.nspname AS index_schema, c.relname AS index_name, c2.relname AS table_name, i.indrelid AS index_table_oid, indkey AS index_col, amname AS index_type FROM pg_catalog.pg_index AS i INNER JOIN pg_catalog.pg_class AS c ON i.indexrelid=c.oid INNER JOIN pg_catalog.pg_class AS c2 ON i.indrelid=c2.oid INNER JOIN pg_catalog.pg_namespace n ON c.relnamespace=n.oid INNER JOIN pg_catalog.pg_am a ON c.relam=a.oid WHERE nspname NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL) AND amname NOT IN ('gin','gist')), idx_unnest as (select index_name, index_schema, table_name, index_type, index_table_oid, index_col_num, ordin from idx, unnest(idx.index_col) with ordinality as k(index_col_num, ordin)), idx_with_names as (select index_name, index_schema, index_type, table_name, array_agg(a_idx.attname::text order by ordin) as idx_col from idx_unnest k inner join pg_attribute a_idx on k.index_col_num = a_idx.attnum and k.index_table_oid = a_idx.attrelid and a_idx.attisdropped = false group by index_name, index_schema, index_type, table_name) SELECT text_search_cols.table_schema, text_search_cols.table_name, text_search_cols.table_type, text_search_cols.column_name[1], idx_with_names.index_type FROM text_search_cols, idx_with_names WHERE idx_with_names.index_schema=text_search_cols.table_schema AND idx_with_names.table_name=text_search_cols.table_name AND (idx_with_names.idx_col[1]=text_search_cols.column_name[1] OR (idx_with_names.idx_col@>text_search_cols.column_name AND text_search_cols.column_name@>idx_with_names.idx_col)) ORDER BY table_schema, table_name, column_name; |
SQL query | Description |
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WITH columns AS (SELECT nspname AS table_schema, relname AS table_name, CASE WHEN relkind='r' THEN 'BASE TABLE' WHEN relkind='m' THEN 'MATERIALIZED VIEW' END AS table_type, attname AS column_name, coalesce(domain_type.typname, pg_type.typname) AS data_type FROM pg_class INNER JOIN pg_namespace ON pg_class.relnamespace=pg_namespace.oid INNER JOIN pg_attribute ON pg_class.oid=pg_attribute.attrelid INNER JOIN pg_type ON pg_attribute.atttypid =pg_type.oid LEFT JOIN pg_type AS domain_type ON domain_type.oid=pg_type.typbasetype WHERE attnum>=1 AND relkind IN ('r','m') AND nspname NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL)), text_search_cols AS (SELECT table_schema, table_name, table_type, array_agg(column_name::text) AS column_name FROM columns WHERE data_type IN ('tsvector') GROUP BY table_schema, table_name, table_type), idx AS (SELECT n.nspname AS index_schema, c.relname AS index_name, c2.relname AS table_name, i.indrelid AS index_table_oid, indkey AS index_col FROM pg_catalog.pg_index AS i INNER JOIN pg_catalog.pg_class AS c ON i.indexrelid=c.oid INNER JOIN pg_catalog.pg_class AS c2 ON i.indrelid=c2.oid INNER JOIN pg_catalog.pg_namespace n ON c.relnamespace=n.oid INNER JOIN pg_catalog.pg_am a ON c.relam=a.oid WHERE nspname NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL) AND amname NOT IN ('gin','gist')), idx_unnest as (select index_name, index_schema, table_name, index_table_oid, index_col_num, ordin from idx, unnest(idx.index_col) with ordinality as k(index_col_num, ordin)), idx_with_names as (select index_name, index_schema, table_name, array_agg(a_idx.attname::text order by ordin) as idx_col from idx_unnest k inner join pg_attribute a_idx on k.index_col_num = a_idx.attnum and k.index_table_oid = a_idx.attrelid and a_idx.attisdropped = false group by index_name, index_schema, table_name) SELECT format('DROP INDEX %1$I.%2$I;', index_schema, index_name) AS statements FROM text_search_cols, idx_with_names WHERE idx_with_names.index_schema=text_search_cols.table_schema AND idx_with_names.table_name=text_search_cols.table_name AND (idx_with_names.idx_col[1]=text_search_cols.column_name[1] OR (idx_with_names.idx_col@>text_search_cols.column_name AND text_search_cols.column_name@>idx_with_names.idx_col)) ORDER BY index_schema, index_name; | Drop the index. |
Collection name | Collection description |
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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 . |
Category name | Category description |
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Full text search | Queries of this category provide information about full text search |
Performance | Queries of this category provide information about indexes in a database. |
Reference |
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https://www.postgresql.org/docs/current/textsearch-indexes.html |