2026-03-12 20:23:15
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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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DEF schemaname=SOE1000G
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GRANT SELECT ON sys.v_$session TO &schemaname;
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-- DROP TABLE &schemaname..workload_control;
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-- DROP TRIGGER &schemaname..workload_control_trigger;
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CREATE TABLE &schemaname..workload_control (
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username VARCHAR2(100) DEFAULT ('*') NOT NULL
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, service_name VARCHAR2(100) DEFAULT '*' NOT NULL
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, module VARCHAR2(100) DEFAULT '*' NOT NULL
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, action VARCHAR2(100) DEFAULT '*' NOT NULL
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, program VARCHAR2(100) DEFAULT '*' NOT NULL
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, client_machine VARCHAR2(100) DEFAULT '*' NOT NULL
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, client_osuser VARCHAR2(100) DEFAULT '*' NOT NULL
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, indexes_visible VARCHAR2(100) DEFAULT 'TRUE'
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, force_serial_direct_read VARCHAR2(100) DEFAULT 'FALSE'
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, CONSTRAINT pk_workload_control PRIMARY KEY (username, service_name, module, action, program, client_machine, client_osuser)
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, CONSTRAINT ck1_workload_control CHECK (indexes_visible IN ('TRUE','FALSE'))
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, CONSTRAINT ck2_workload_control CHECK (force_serial_direct_read IN ('TRUE', 'FALSE'))
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);
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INSERT INTO &schemaname..workload_control (username, indexes_visible) VALUES ('&schemaname', 'TRUE');
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INSERT INTO &schemaname..workload_control (username, program, indexes_visible, force_serial_direct_read)
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VALUES ('&schemaname', 'sqlplus@mac02.local (TNS V1-V3)', 'FALSE', 'TRUE');
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COMMIT;
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CREATE OR REPLACE TRIGGER &schemaname..workload_control_trigger
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AFTER LOGON ON &schemaname..SCHEMA
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DECLARE
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c NUMBER;
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BEGIN
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-- set optimizer_use_invisible_indexes
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FOR s IN (SELECT * FROM v$session WHERE sid = SYS_CONTEXT('userenv', 'sid'))
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LOOP -- this loop returns only 1 row
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SELECT COUNT(*) INTO c
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FROM &schemaname..workload_control ctl
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WHERE
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(ctl.username = s.username OR ctl.username = '*')
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AND (ctl.service_name = s.service_name OR ctl.service_name = '*')
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AND (ctl.module = s.module OR ctl.module = '*')
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AND (ctl.action = s.action OR ctl.action = '*')
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AND (ctl.program = s.program OR ctl.program = '*')
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AND (ctl.client_machine = s.machine OR ctl.client_machine = '*')
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AND (ctl.client_osuser = s.osuser OR ctl.client_osuser = '*')
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AND indexes_visible = 'FALSE';
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IF c > 0 THEN
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EXECUTE IMMEDIATE 'alter session set optimizer_use_invisible_indexes = false';
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ELSE
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EXECUTE IMMEDIATE 'alter session set optimizer_use_invisible_indexes = true';
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END IF;
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END LOOP;
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-- set _serial_direct_read
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FOR s IN (SELECT * FROM v$session WHERE sid = SYS_CONTEXT('userenv', 'sid'))
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LOOP -- this loop returns only 1 row
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SELECT COUNT(*) INTO c
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FROM &schemaname..workload_control ctl
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WHERE
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(ctl.username = s.username OR ctl.username = '*')
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AND (ctl.service_name = s.service_name OR ctl.service_name = '*')
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AND (ctl.module = s.module OR ctl.module = '*')
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AND (ctl.action = s.action OR ctl.action = '*')
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AND (ctl.program = s.program OR ctl.program = '*')
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AND (ctl.client_machine = s.machine OR ctl.client_machine = '*')
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AND (ctl.client_osuser = s.osuser OR ctl.client_osuser = '*')
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AND force_serial_direct_read = 'TRUE';
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IF c > 0 THEN
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EXECUTE IMMEDIATE 'alter session set "_serial_direct_read" = ALWAYS';
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END IF;
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END LOOP;
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END;
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/
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SHOW ERR
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-- set all indexes invisible in your hybrid-workload schema
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ALTER SESSION SET ddl_lock_timeout = 10;
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BEGIN
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FOR i IN (SELECT index_name FROM user_indexes
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WHERE table_name NOT IN 'WORKLOAD_CONTROL'
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AND table_owner NOT IN ('SYS', 'SYSTEM')
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AND table_owner = '&schemaname'
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AND visibility = 'VISIBLE')
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LOOP
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EXECUTE IMMEDIATE 'ALTER INDEX '||i.index_name||' INVISIBLE';
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END LOOP;
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END;
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/
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@@ -0,0 +1,73 @@
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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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-- DROP TABLE test_users;
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-- DROP TABLE test_objects;
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CREATE TABLE test_users AS SELECT * FROM all_users;
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CREATE TABLE test_objects AS SELECT * FROM all_objects;
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CREATE INDEX i_test_users ON test_users (username);
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CREATE INDEX i_test_objects ON test_objects (owner);
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EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'TEST_USERS');
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EXEC DBMS_STATS.GATHER_TABLE_STATS(user,'TEST_OBJECTS');
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PROMPT ==================================================================================
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PROMPT This plan should use indexes as they are visible and available:
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PROMPT ==================================================================================
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SELECT
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SUM(u.user_id) + SUM(o.object_id)
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FROM
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test_users u
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, test_objects o
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WHERE
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u.username = o.owner
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AND u.username LIKE 'S%'
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AND o.owner LIKE 'S%'
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/
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SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
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PROMPT ==================================================================================
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PROMPT Making indexes invisible. The plan should use FULL TABLE scans now:
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PROMPT ==================================================================================
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ALTER INDEX i_test_users INVISIBLE;
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ALTER INDEX i_test_objects INVISIBLE;
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ALTER SESSION SET optimizer_use_invisible_indexes = false;
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SELECT
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SUM(u.user_id) + SUM(o.object_id)
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FROM
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test_users u
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, test_objects o
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WHERE
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u.username = o.owner
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AND u.username LIKE 'S%'
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AND o.owner LIKE 'S%'
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/
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SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
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PROMPT ==================================================================================
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PROMPT Setting optimizer_use_invisible_indexes = TRUE. The plan should use indexes again:
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PROMPT ==================================================================================
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ALTER SESSION SET optimizer_use_invisible_indexes = true;
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SELECT
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SUM(u.user_id) + SUM(o.object_id)
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FROM
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test_users u
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, test_objects o
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WHERE
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u.username = o.owner
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AND u.username LIKE 'S%'
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AND o.owner LIKE 'S%'
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/
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SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR);
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