28 lines
938 B
MySQL
28 lines
938 B
MySQL
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-- Copyright 2020 Tanel Poder. All rights reserved. More info at https://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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DECLARE
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cmd CLOB := 'CREATE TABLE widetable ( id NUMBER PRIMARY KEY ';
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ins CLOB := 'INSERT INTO widetable SELECT rownum';
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BEGIN
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FOR x IN 1..999 LOOP
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cmd := cmd || ', col'||TRIM(TO_CHAR(x))||' VARCHAR2(10)';
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ins := ins || ', TRIM(TO_CHAR(rownum))';
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END LOOP;
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cmd := cmd || ')';
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ins := ins || ' FROM dual CONNECT BY level <= 100';
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EXECUTE IMMEDIATE cmd;
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EXECUTE IMMEDIATE ins;
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END;
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/
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COMMIT;
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-- stats with histograms
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EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'WIDETABLE',method_opt=>'FOR TABLE, FOR ALL COLUMNS SIZE 254');
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-- no histograms
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-- EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'WIDETABLE',method_opt=>'FOR TABLE, FOR ALL COLUMNS SIZE 1');
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-- EXEC sys.dbms_shared_pool.purge('SYSTEM', 'WIDETABLE', 1, 1);
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