oraclet通过DBMS_SQLTUNE.EXECUTE_TUNING_TASK获取优化建议

DBMS_sqlTUNE.EXECUTE_TUNING_TASK

1 通过取得来自cursor cache 的sql_id来指定sql语句来建立任务

2 sql调优的集合包括的多个语句来建立任务

3 单一sql语句的文本来建立任务

4 通过用awr中相应的sql_id来取得sql语句建立任务

用sql_id获取当sql_id不在v$session a, v$process b, v$sqlarea内，获取到的优化建议为空

  DECLARE

my_task_name VARCHAR2(30);

  sql_id VARCHAR2(30);

BEGIN

sql_id := '&sqlid';

my_task_name := DBMS_SQLTUNE.CREATE_TUNING_TASK

    (sql_id=> sql_id,

                  scope => 'comprehensive',

                  time_limit=>60,

                  task_name=>'my_sql_tuning_'||sql_id,

                  description => 'Tuning Task');

                   DBMS_SQLTUNE.EXECUTE_TUNING_TASK('my_sql_tuning_'||sql_id);

END;

提示输入sql_id

SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK('my_sql_tuning_&sqlid') FROM DUAL

BEGIN  dbms_sqltune.drop_tuning_task('my_sql_tuning_520mkxqpf15q8'); END;

BEGIN  dbms_sqltune.drop_tuning_task('my_sql_tuning_&sqlid'); END;

DBMS_SQLTUNE.EXECUTE_TUNING_TASK用sql文本获取优化建议

DECLARE

  MY_TASK_NAME VARCHAR2(30);

   MY_SQLTEXT CLOB;

BEGIN

  MY_SQLTEXT :='SELECT * FROM TEST_OBJECT_TTX WHERE OBJECT_ID = :BND';

  MY_TASK_NAME := DBMS_SQLTUNE.CREATE_TUNING_TASK(SQL_TEXT => MY_SQLTEXT,

                  BIND_LIST=>SQL_BINDS(ANYDATA.CONVERTNUMBER(9)),

                  USER_NAME => 'NOAP',

                  SCOPE=>'COMPREHENSIVE',

                  TIME_LIMIT => 60,

                  TASK_NAME =>  'SQL_TUNING_TEST',

                  DESCRIPTION=>'TUNING TASK'

                  );

END;

select a.program, b.spid, c.sql_text,c.SQL_ID

  from v$session a, v$process b, v$sqlarea c

   where a.paddr = b.addr

   and a.sql_hash_value = c.hash_value

   and a.username is not null

  and  c.SQL_ID = '7hjb2wh4nprf7'