35 lines
1.0 KiB
MySQL
35 lines
1.0 KiB
MySQL
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-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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SET ECHO ON
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-- DROP TABLE t;
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-- CREATE TABLE t AS SELECT a.* FROM dba_objects a, dba_objects b WHERE rownum <= 10000000;
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-- EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'T');
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SET TIMING ON
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SELECT /* test 1 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
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SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
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ALTER SESSION SET nls_comp = LINGUISTIC;
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ALTER SESSION SET nls_sort = BINARY_CI;
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SELECT /* test 2 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
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SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
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-- ALTER SESSION SET "_cursor_plan_hash_version"=2;
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--
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-- SELECT /* test 3 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
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-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
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--
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-- ALTER SESSION SET nls_comp = BINARY;
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-- ALTER SESSION SET nls_sort = BINARY;
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--
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-- SELECT /* test 4 */ SUM(LENGTH(owner)) FROM t WHERE owner > 'S';
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-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
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SET ECHO OFF
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