SQL访问顾问SAA(SQL Access Advisor)理论部分五： 定义工作量的内容之一：SQL调优集

SQL调优集
       SQL调优集是工作量档案中的一种工作量。可以使用SQL调整集作为SQL Access Advisor的工作量通过 dbms_advisor.import_workload_sts过程进行导入。下面是使用语法:

dbms_advisor.import_sqlwkld_sts (workload_name in varchar2,
sts_owner in varchar2,
sts_name in varchar2,
import_mode in varchar2 := 'new',
priority in number := 2,
saved_rows out number,
failed_rows out number);


dbms_advisor.import_sqlwkld_sts (workload_name in varchar2,
sts_name in varchar2,
import_mode in varchar2 := 'new',
priority in number := 2,
saved_rows out number,
failed_rows out number);

在工作量被收集并且过滤语句后，SQL Access Advisor使用工作量中的DML语句来计算使用统计数据 ，下面的例子使用SQL调优集创建一个名叫my_sts_workload的工作量

SQL> exec dbms_sqltune.create_sqlset(sqlset_name => 'MY_STS_WORKLOAD',description =>  'SQL Access Advisor Test',sqlset_owner => 'INSUR_CHANGDE');

PL/SQL procedure successfully completed

SQL>
SQL> declare
  2    cur dbms_sqltune.sqlset_cursor;
  3  begin
  4    open cur for
  5      select value(p)
  6        from table(dbms_sqltune.select_cursor_cache ('parsing_schema_name=''INSUR_CHANGDE'' and force_matching_signature<>0 and  buffer_gets>1000 and executions>100 and command_type<>2',
  7                                                    null,
  8                                                    null,
  9                                                    null,
 10                                                    null,
 11                                                    1,
 12                                                    null,
 13                                                    'all')) p;
 14    dbms_sqltune.load_sqlset(sqlset_name     => 'MY_STS_WORKLOAD',
 15                             populate_cursor => cur);
 16  end;
 17  /

PL/SQL procedure successfully completed



SQL> variable sqlsetname varchar2(30);
SQL> variable workload_name varchar2(30);
SQL> variable saved_stmts number;
SQL> variable failed_stmts number;
SQL> execute :sqlsetname := 'my_sts_workload';

PL/SQL procedure successfully completed
sqlsetname
---------
my_sts_workload
SQL> execute :workload_name := 'my_workload';

PL/SQL procedure successfully completed
workload_name
---------
my_workload
SQL> execute dbms_advisor.create_sqlwkld (:workload_name);

PL/SQL procedure successfully completed
workload_name
---------
my_workload

SQL> execute dbms_advisor.import_sqlwkld_sts (:workload_name ,:sqlsetname, 'NEW',  1,:saved_stmts, :failed_stmts);

PL/SQL procedure successfully completed
workload_name
---------
my_workload
sqlsetname
---------
MY_STS_WORKLOAD
saved_stmts
---------
1219
failed_stmts
---------
13