2026-03-12 20:23:15

tpt/ast/03_index_inefficiency_1.sql

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+-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+select /*+ index_rs(o o(owner)) */ avg(sysdate - created) days_old 
+from
+     indexed_objects o 
+where 
+    owner = 'SYS' 
+and object_type = 'PACKAGE'
+/
+
+@x
+
+-- Then create an index which satisfies the additional filter column...
+--   create index idx2_indexed_objects on indexed_objects (owner, object_type);
+
+-- Then re-create the index with also the column that includes the columns selected in the query
+--   drop index idx2_indexed_objects;
+--   create index idx2_indexed_objects on indexed_objects (owner, object_type, created);
+