Sql Access Advisor https://community.oracle.com/people/royalwzy/blog/2016/02/02/performance-tuning-tool04-sql-access-advisor

1. SAA(Sql Access Advisor)
1. :
1. SAA ;
2. EM SAA ;
3. DMBS_ADVISOR ;
2. SAA :
1. , ;
2. Bitmap , B-Tree ;
3. , ;
3. SAA :
1. SQL :
1. SQL Cache: v$sql sql ;
2. User-defined: , sql sql , SAA;
3. STS: Sql Tuning Set, ;
2.
1. Simultaneously considers index solutions, materialized view solutions, or
combinations of both;
2. Considers storage for creation and maintenance costs;
3. Does not generate drop recommendations for partial workloads;
4. Optimizes materialized views for maximum query rewrite usage and fast refresh;
5. Recommends materialized view logs for fast refresh;
6. Combines similar indexes into a single index;
7. Generates recommendations that support multiple workload queries;
3. ;
4. :Comprehensive Limited;
1. Add new index on table or materialized view;
2. Drop an unused index;
3. Modify an existing index by changing the index type;
4. Modify an existing index by adding columns at the end;
5. Add a new materialized view;
6. Drop an unused materialized view;
7. Add a new materialized view log;
8. Modify an existing materialized view log to add new columns or clauses;
9. Comprehensive 1-8 ;
10. Limited 1,4,5,7,8 ;
4. SAA :
1. ADVISOR ;
2. SELECT , ;
5. SAA :
1. ;
2. EM ;
3. DMBS_ADVISOR ;
6. DMBS_ADVISOR :
1. :
1. , ;
2. ;
3. ;
4. ;
2. SAA ;
3. :DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, :task_id,
:task_name);
4. SAA :
1. :DBMS_ADVISOR.SET_TASK_PARAMETER(:task_name, parameter, value);
2. :DBMS_ADVISOR.SET_SQLWKLD_PARAMETER(:workload_name, parameter,
value);
5. :DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, :task_id,
:task_name, template=>:template_name, is_template=>'TRUE');
6. :DBMS_ADVISOR.CREATE_SQLWKLD(:workload_name);
1. SQL Tuning Sets:DBMS_ADVISOR.IMPORT_SQLWKLD_STS();
2. :DBMS_ADVISOR.IMPORT_SQLWKLD_USER();
3. SQL Cache:DBMS_ADVISOR.IMPORT_SQLWKLD_SQLCACHE();
4. SQL :DBMS_ADVISOR.ADD_SQLWKLD_STATEMENT();
5. SQL :DBMS_ADVISOR.IMPORT_SQLWKLD_SCHEMA();
7. :DBMS_ADVISOR.DELETE_SQLWKLD(:workload_name);
8. :DBMS_ADVISOR.ADD_SQLWKLD_REF(:task_name, :workload_name);
9. SAA :DBMS_ADVISOR.EXECUTE_TASK(:task_name);
1. :dba/user_advisor_recommendations;
2. dbms_advisor.get_task_script ;
10. SAA :
1. / ;
2. / ;
3. / ;
4. ;
11. SQL :
1. DIRECTORY;
2. ;
3. ;
7. SQL , , DBMS_ADVISOR.QUICK_TUNE() ;
8. :
1. DBMS_MVIEW.EXPLAIN_MVIEW: / ;
2. DBMS_MVIEW.EXPLAIN_REWRITE: , , ;
3. DBMS_ADVISOR.TUNE_MVIEW: ;
-------------------------------- SAA --------------------------------
-- 1. ;
CONNECT / AS SYSDBA;
ALTER USER sh IDENTIFIED BY oracle ACCOUNT UNLOCK;
GRANT DBA TO sh;
ALTER SYSTEM FLUSH shared_pool;
ALTER SYSTEM FLUSH buffer_cache;
CONNECT sh/oracle;
SET autotrace traceonly stat;
SELECT c.cust_last_name, SUM(s.amount_sold) AS dollars, SUM(s.quantity_sold) AS quantity
FROM sales s, customers c, products p
WHERE c.cust_id = s.cust_id AND
s.prod_id = p.prod_id AND
c.cust_state_province IN ('Dublin', 'Galway')
GROUP BY c.cust_last_name;
SELECT c.cust_id, SUM(amount_sold) AS dollar_sales
FROM sales s, customers c
WHERE s.cust_id = c.cust_id
GROUP BY c.cust_id;
SELECT SUM(unit_cost) FROM costs GROUP BY prod_id;
SELECT * FROM customers WHERE cust_postal_code = '83786';
-- 2. EM SAA ;
1.Databaes Instance->Advisor Central->SQL Access Advisor;
2. SQL : SQL ;
3. : , ;
4. , ;
5. ;
6. ;
-- 3. DBMS_ADVISOR ;
1. ;
VARIABLE v_task_id NUMBER;
VARIABLE v_task_name VARCHAR2(255);
VARIABLE v_wkld_name VARCHAR2(255);
2. ;
EXECUTE :v_task_name := 'my_task';
EXECUTE :v_wkld_name := 'my_sql_wkld';
3. ;
BEGIN
dbms_advisor.delete_sqlwkld_ref(:v_task_name, :v_wkld_name);
dbms_advisor.delete_sqlwkld(:v_wkld_name);
dbms_advisor.delete_task(:v_task_name);
EXCEPTION
WHEN OTHERS THEN
NULL;
END;
/
4. ;
EXECUTE DBMS_ADVISOR.CREATE_TASK(DBMS_ADVISOR.SQLACCESS_ADVISOR, :v_task_id, :v_task_name);
5. ;
SELECT * FROM user_advisor_tasks;
6. , , ;
EXECUTE dbms_advisor.set_task_parameter(:v_task_name, 'EXECUTION_TYPE', 'FULL');
EXECUTE dbms_advisor.set_task_parameter(:v_task_name, 'MODE', 'COMPREHENSIVE');
7. ;
EXECUTE dbms_advisor.create_sqlwkld(:v_wkld_name);
8. ;
EXECUTE dbms_advisor.add_sqlwkld_ref(:v_task_name, :v_wkld_name);
9. ;
SELECT * FROM user_advisor_sqla_wk_map;
10. , SQL Cache ;
VARIABLE v_saved_stmts NUMBER;
VARIABLE v_failed_stmts NUMBER;
EXECUTE DBMS_ADVISOR.IMPORT_SQLWKLD_SQLCACHE(:v_wkld_name, 'APPEND', 2, :v_saved_stmts,
:v_failed_stmts);
11. SQL ;
SELECT * FROM user_advisor_sqlw_stmts;
12. , ;
EXECUTE DBMS_ADVISOR.EXECUTE_TASK(:v_task_name);
13. ;
SELECT * FROM user_advisor_recommendations;
14. ;
:SELECT DBMS_ADVISOR.GET_TASK_SCRIPT(:v_task_name) FROM dual;
, ;
CONNECT / AS SYSDBA;
DROP DIRECTORY ADVISOR_RESULTS;
CREATE OR REPLACE DIRECTORY ADVISOR_RESULTS AS '/home/oracle';
GRANT READ, WRITE ON DIRECTORY ADVISOR_RESULTS TO sh;
CONNECT SH/ORACLE
EXECUTE DBMS_ADVISOR.CREATE_FILE(DBMS_ADVISOR.GET_TASK_SCRIPT(:v_task_name), 'ADVISOR_RESULTS',
'advscript.sql');
-------------------------------- SAA --------------------------------
-------------------------------- SAA --------------------------------
1. ;
CONNECT sh/oracle;
VARIABLE v_task_name VARCHAR2(30);
EXECUTE :v_task_name := 'quick_task';
2. , SQL , ;
EXECUTE dbms_advisor.quick_tune(dbms_advisor.sqlaccess_advisor, :v_task_name, 'SELECT
AVG(amount_sold) FROM sh.sales WHERE promo_id=10');
3. ;
SELECT DBMS_ADVISOR.GET_TASK_SCRIPT(:v_task_name) FROM dual;
-------------------------------- SAA --------------------------------