Create duplicate_indexes.sql

Author: kaceymiri

indexes/duplicate_indexes.sql

@@ -0,0 +1,21 @@
+
+\o /tmp/duplicate-indexes.txt
+
+-- check for exact matches
+SELECT indrelid::regclass
+     , array_agg(indexrelid::regclass)
+  FROM pg_index
+ GROUP BY indrelid
+     , indkey
+HAVING COUNT(*) > 1;
+
+-- check for matches on only the first column of the index
+-- requires some human eyeballing to verify
+SELECT indrelid::regclass
+     , array_agg(indexrelid::regclass)
+  FROM pg_index
+ GROUP BY indrelid
+     , indkey[0]
+HAVING COUNT(*) > 1;
+
+\o