enable ragel parser for comments, add additional sql diagnostic queries

db/scripts.sql

@@ -93,6 +93,69 @@ ORDER BY
 n_live_tup DESC;
 
 
+-- index size/usage
+SELECT
+    t.tablename,
+    indexname,
+    c.reltuples AS num_rows,
+    pg_size_pretty(pg_relation_size(quote_ident(t.tablename)::text)) AS table_size,
+    pg_size_pretty(pg_relation_size(quote_ident(indexrelname)::text)) AS index_size,
+    CASE WHEN indisunique THEN 'Y'
+       ELSE 'N'
+    END AS UNIQUE,
+    idx_scan AS number_of_scans,
+    idx_tup_read AS tuples_read,
+    idx_tup_fetch AS tuples_fetched
+FROM pg_tables t
+LEFT OUTER JOIN pg_class c ON t.tablename=c.relname
+LEFT OUTER JOIN
+    ( SELECT c.relname AS ctablename, ipg.relname AS indexname, x.indnatts AS number_of_columns, idx_scan, idx_tup_read, idx_tup_fetch, indexrelname, indisunique FROM pg_index x
+           JOIN pg_class c ON c.oid = x.indrelid
+           JOIN pg_class ipg ON ipg.oid = x.indexrelid
+           JOIN pg_stat_all_indexes psai ON x.indexrelid = psai.indexrelid )
+    AS foo
+    ON t.tablename = foo.ctablename
+WHERE t.schemaname='public'
+ORDER BY 1,2;
+
+
+-- index summary
+SELECT
+    pg_class.relname,
+    pg_size_pretty(pg_class.reltuples::BIGINT) AS rows_in_bytes,
+    pg_class.reltuples AS num_rows,
+    COUNT(indexname) AS number_of_indexes,
+    CASE WHEN x.is_unique = 1 THEN 'Y'
+       ELSE 'N'
+    END AS UNIQUE,
+    SUM(CASE WHEN number_of_columns = 1 THEN 1
+              ELSE 0
+            END) AS single_column,
+    SUM(CASE WHEN number_of_columns IS NULL THEN 0
+             WHEN number_of_columns = 1 THEN 0
+             ELSE 1
+           END) AS multi_column
+FROM pg_namespace 
+LEFT OUTER JOIN pg_class ON pg_namespace.oid = pg_class.relnamespace
+LEFT OUTER JOIN
+       (SELECT indrelid,
+           MAX(CAST(indisunique AS INTEGER)) AS is_unique
+       FROM pg_index
+       GROUP BY indrelid) x
+       ON pg_class.oid = x.indrelid
+LEFT OUTER JOIN
+    ( SELECT c.relname AS ctablename, ipg.relname AS indexname, x.indnatts AS number_of_columns FROM pg_index x
+           JOIN pg_class c ON c.oid = x.indrelid
+           JOIN pg_class ipg ON ipg.oid = x.indexrelid  )
+    AS foo
+    ON pg_class.relname = foo.ctablename
+WHERE 
+     pg_namespace.nspname='public'
+AND  pg_class.relkind = 'r'
+GROUP BY pg_class.relname, pg_class.reltuples, x.is_unique
+ORDER BY 2;
+
+
 -- sequential scans
 SELECT relname AS name,
 seq_scan as count