2026-03-12 20:23:15

tpt/exadata/nls_smart_scan.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.
+
+SET ECHO ON
+
+-- DROP TABLE t;
+-- CREATE TABLE t AS SELECT a.* FROM dba_objects a, dba_objects b WHERE rownum <= 10000000;
+-- EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'T');
+
+SET TIMING ON
+
+SELECT /* test 1 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
+SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
+
+ALTER SESSION SET nls_comp = LINGUISTIC;
+ALTER SESSION SET nls_sort = BINARY_CI;
+
+SELECT /* test 2 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
+SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
+
+-- ALTER SESSION SET "_cursor_plan_hash_version"=2;
+-- 
+-- SELECT /* test 3 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
+-- 
+-- ALTER SESSION SET nls_comp = BINARY;
+-- ALTER SESSION SET nls_sort = BINARY;
+-- 
+-- SELECT /* test 4 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
+-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
+
+
+SET ECHO OFF
+