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2026-03-12 20:23:15

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2026-03-12 21:23:47 +01:00
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commit 93039b8489
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16
tpt/experiments/add_column_default_value.sql Normal file
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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.
DROP TABLE t;
CREATE TABLE t (a int) TABLESPACE users;
INSERT /*+ APPEND */ INTO t SELECT rownum FROM dba_source;
COMMIT;
--ALTER TABLE t ADD b INT DEFAULT 123 NOT NULL;
PAUSE Hit enter to add column
ALTER TABLE t ADD c VARCHAR2(100) DEFAULT 'taneltest' NOT NULL;
PAUSE Hit enter to change default value
ALTER TABLE t MODIFY c VARCHAR2(100) DEFAULT 'not testing anymore';

8
tpt/experiments/bigfile_hwm_brokering.sql Normal file
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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.
CREATE BIGFILE TABLESPACE big DATAFILE SIZE 100M AUTOEXTEND ON MAXSIZE 10G
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 16M SEGMENT SPACE MANAGEMENT AUTO;
CREATE TABLE system.t_big TABLESPACE big PARALLEL 4 AS SELECT * FROM dba_source;

67
tpt/experiments/histogram_linear_decay_of_selectivity.sql Normal file
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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.
DROP TABLE t;
CREATE TABLE t AS SELECT * FROM dba_objects;
SELECT
MIN(created)
, MAX(created)
, ROUND(MAX(created)-MIN(created)) range_days
, COUNT(*) num_rows
, COUNT(*) / ROUND(MAX(created)-MIN(created)) rows_per_day
, SUM(NVL2(created,0,1)) nulls
FROM
t
/
EXEC DBMS_STATS.GATHER_TABLE_STATS(user, 'T', method_opt=>'FOR TABLE', no_invalidate=>FALSE);
-- SELECT * FROM t WHERE created > SYSDATE - 1;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE + 1;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE + 10;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE + 100;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
-- SELECT * FROM t WHERE created > DATE'2012-09-01';
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
SELECT * FROM t WHERE created < DATE'2010-10-01';
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
EXEC DBMS_STATS.GATHER_TABLE_STATS(user, 'T', method_opt=>'FOR TABLE FOR ALL COLUMNS SIZE 254', no_invalidate=>FALSE);
-- SELECT * FROM t WHERE created > SYSDATE - 1;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE + 1;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE + 10;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
--
-- SELECT * FROM t WHERE created > SYSDATE + 100;
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
-- SELECT * FROM t WHERE created > DATE'2012-09-01';
-- SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));
SELECT * FROM t WHERE created < DATE'2010-10-01';
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(null,null,'+PEEKED_BINDS'));

36
tpt/experiments/lob_select_for_update.sql Normal file
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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.
DROP TABLE tlob;
CREATE TABLE tlob (a INT, b CLOB);
INSERT INTO tlob VALUES(1, LPAD('x',2048,'x'));
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
UPDATE tlob SET b = b||b;
COMMIT;
SELECT DBMS_LOB.GETLENGTH(b) FROM tlob;
DROP TABLE tdummy;
CREATE table tdummy AS SELECT * FROM all_objects;
DELETE tdummy;
ALTER SYSTEM CHECKPOINT;
ALTER SYSTEM SWITCH LOGFILE;
SELECT * FROM tlob WHERE a=1 FOR UPDATE;
COMMIT;
@log
ALTER SYSTEM SWITCH LOGFILE;