Oracle SQL REPLAY

Steps for SQL REPLAY

1. Collect Sqls
2. Create the SQL Replay Task with SQL Tuning Set (STS)
3. Collect SQL Performance Before Changes
4. Make Database Change ( eg collect stats etc)
5. Collect SQL Performance After Changes
6. Comparing SQL Performance Before and After Change
7. Display the Results of a SQL Replay Task

1.Collect SQLs.

We can collect the sql from the cursor cache and AWR.

from the cursor cache:

SQL> conn henry/henry
已连接。
SQL> exec dbms_sqltune.create_sqlset ('MYSQLSET');

PL/SQL 过程已成功完成。

SQL> DECLARE
2
3 cur dbms_sqltune.sqlset_cursor;
4
5 BEGIN
6
7 OPEN cur FOR
8 SELECT VALUE(p)
9 FROM TABLE (dbms_sqltune.select_cursor_cache) p;
10
11 dbms_sqltune.load_sqlset(
12 sqlset_name => 'MYSQLSET',
13 populate_cursor => cur);
14
15 END;
16 /

PL/SQL 过程已成功完成。

from the AWR.

SQL> DECLARE
2 cur DBMS_SQLTUNE.SQLSET_CURSOR;
3 BEGIN
4
5 OPEN cur FOR
6 SELECT VALUE(P)
7 FROM table(
8 DBMS_SQLTUNE.SELECT_WORKLOAD_REPOSITORY(1,100)) P;
9
10 DBMS_SQLTUNE.LOAD_SQLSET(sqlset_name => 'MYSQLSET',
11 populate_cursor => cur,
12 load_option => 'MERGE',
13 update_option => 'ACCUMULATE');
14 END;
15 /
DECLARE
*
第 1 行出现错误:
ORA-13768: 快照 ID 必须介于 231 和 355 之间。
ORA-06512: 在 "SYS.DBMS_SQLTUNE", line 4561
ORA-06512: 在 line 10


SQL> ed
已写入 file afiedt.buf

1 DECLARE
2 cur DBMS_SQLTUNE.SQLSET_CURSOR;
3 BEGIN
4 OPEN cur FOR
5 SELECT VALUE(P)
6 FROM table(
7 DBMS_SQLTUNE.SELECT_WORKLOAD_REPOSITORY(231,354)) P;
8 DBMS_SQLTUNE.LOAD_SQLSET(sqlset_name => 'MYSQLSET',
9 populate_cursor => cur,
10 load_option => 'MERGE',
11 update_option => 'ACCUMULATE');
12* END;
13 /

PL/SQL 过程已成功完成。

2.Create the SQL Replay Task with SQL Tuning Set (STS)

SQL> ed
已写入 file afiedt.buf

1 declare
2 l_task_id varchar2(20);
3 begin
4 l_task_id := dbms_sqltune.create_tuning_task (
5 sqlset_name => 'MYSQLSET',
6 task_name => 'MY_REPLAY_TASK');
7* end;
SQL> /
declare
*
第 1 行出现错误:
ORA-13607: 指定的任务或对象 MY_REPLAY_TASK 已存在
ORA-06512: 在 "SYS.DBMS_SQLTUNE_INTERNAL", line 7718
ORA-06512: 在 "SYS.PRVT_SQLADV_INFRA", line 275
ORA-06512: 在 "SYS.DBMS_SQLTUNE", line 674
ORA-06512: 在 line 4


SQL> ed
已写入 file afiedt.buf

1 declare
2 l_task_id varchar2(20);
3 begin
4 l_task_id := dbms_sqltune.create_tuning_task (
5 sqlset_name => 'MYSQLSET',
6 task_name => 'MY_REPLAY_TASK1');
7* end;
SQL> /

PL/SQL 过程已成功完成。

3.Collect SQL Performance Before Changes

SQL> begin
2 dbms_sqltune.execute_tuning_task (
3 execution_name => 'MY_REPLAY_EXECUTE_BEFORE',
4 task_name => 'MY_REPLAY_TASK1');
5 end;
6 /

PL/SQL 过程已成功完成。

4.Make Database Change

SQL> alter system set "_b_tree_bitmap_plans" = false;

系统已更改。

SQL> alter system set optimizer_index_cost_adj=1;

系统已更改。

5.Collect SQL Performance After Changes

SQL> begin
2
3 dbms_sqltune.execute_tuning_task (
4 execution_name => 'MY_REPLAY_EXECUTE_AFTER',
5 task_name => 'MY_REPLAY_TASK1');
6 end;
7 /

PL/SQL 过程已成功完成。

6. Comparing SQL Performance Before and After Change

SQL> begin
2
3 dbms_sqltune.execute_tuning_task (
4 execution_name => 'MY_COMPARE_EXECUTION',
5 task_name => 'MY_REPLAY_TASK1');
6 end;
7 /

PL/SQL 过程已成功完成。

7.Display the Results of a SQL Replay Task

set serveroutput on size 999999

set long 999999

select dbms_sqltune.report_tuning_task (‘MY_REPLAY_TASK1’) from dual;