oraclesql调优集 - 数据库编程

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1.新建调优集对象
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---授权

grant ADMINISTER ANY SQL TUNING SET  to scott;


---删除存在的STS



BEGIN
  DBMS_SQLTUNE.DROP_SQLSET(
    sqlset_name => 'OCPYANG_STS'
    );
END;
/


---新建STS


BEGIN
  DBMS_SQLTUNE.CREATE_SQLSET(
    sqlset_name => 'OCPYANG_STS', 
    sqlset_owner => 'SCOTT',
    description  => 'ocpyangtest');
END;
/


---查看数据库已经创建的SQLSET

select owner, name, id, created, statement_count from dba_sqlset;






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2.查看AWR资源密集型SQL语句
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---2.1查看可用的快照范围

SELECT snap_id, instance_number, end_interval_time
FROM dba_hist_snapshot
ORDER BY snap_id;


---2.2 查看快照编号820-840之间磁盘使用率前10的sql

SELECT sql_id
,substr(sql_text,1,100)
,disk_reads, cpu_time, elapsed_time
FROM table(DBMS_SQLTUNE.SELECT_WORKLOAD_REPOSITORY(820,841,
            null, null, 'disk_reads',null, null, null, 10))
ORDER BY disk_reads DESC;


---2.3查看没有被sys用户解析的sql

SELECT sql_id, substr(sql_text,1,100)
,disk_reads, cpu_time, elapsed_time, parsing_schema_name
FROM table(
DBMS_SQLTUNE.SELECT_WORKLOAD_REPOSITORY(820,841,
'parsing_schema_name <> ''SYS''',
NULL, NULL,NULL,NULL, 1, NULL, 'ALL'));


---2.4 查看快照编号820-840之间非sql用户排序的前10的sql
SELECT sql_id, substr(sql_text,1,100)
,disk_reads, cpu_time, elapsed_time, buffer_gets, parsing_schema_name
FROM table(
DBMS_SQLTUNE.SELECT_WORKLOAD_REPOSITORY(
 begin_snap => 820
,end_snap => 841
,basic_filter => 'parsing_schema_name <> ''SYS'''
,ranking_measure1 => 'buffer_gets'
,result_limit => 10
));



COL bsnap NEW_VALUE begin_snap
COL esnap NEW_VALUE end_snap
--
SELECT MAX(snap_id) bsnap
FROM dba_hist_snapshot
WHERE begin_interval_time < sysdate-7;
--
SELECT MAX(snap_id) esnap
FROM dba_hist_snapshot;


--
COL sql_text            FORMAT A40
COL sql_id              FORMAT A15
COL parsing_schema_name FORMAT A15
COL cpu_seconds         FORMAT 999,999,999,999,999
SET LONG 10000 LINES 132 PAGES 100 TRIMSPOOL ON
--


SELECT sql_id, sql_text
,disk_reads, cpu_time cpu_seconds, elapsed_time, buffer_gets, parsing_schema_name
FROM table(
DBMS_SQLTUNE.SELECT_WORKLOAD_REPOSITORY(
 begin_snap =>




 &begin_snap
,end_snap => &end_snap
,basic_filter => 'parsing_schema_name <> ''SYS'''
,ranking_measure1 => 'cpu_time'
,result_limit => 10
));



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3.使用AWR中高资源消耗的SQL来填充优化集:
************************************************************





---3.1新建STS


BEGIN
  DBMS_SQLTUNE.CREATE_SQLSET(
    sqlset_name => 'OCPYANG_STS', 
    sqlset_owner => 'SCOTT',
    description  => 'ocpyangtest');
END;
/

---3.2查看AWR快照起止

select snap_id, begin_interval_time
from dba_hist_snapshot order by 1;

---3.3使用AWR中高资源的sql来填充sql优化集

DECLARE
  test_cur dbms_sqltune.sqlset_cursor;
BEGIN
  OPEN test_cur FOR
    SELECT value(x)
    FROM table(dbms_sqltune.select_workload_repository(
      820,841, null, null,'disk_reads',
      null, null, null, 15)) x;
  --
  dbms_sqltune.load_sqlset(
   sqlset_owner =>'SCOTT',
    sqlset_name => 'OCPYANG_STS',
    populate_cursor => test_cur);
END;
/

*------------------常见错误

第 1 行出现错误:
ORA-13774: 权限不足, 无法从工作量资料档案库中选择数据 ORA-06512: 在
"SYS.DBMS_SQLTUNE", line 4715
ORA-06512: 在 line 10

使用sys账户即可，在DBMS_SQLTUNE.LOAD_SQLSET指定sqlset_owner


DBMS_SQLTUNE.LOAD_SQLSET (
   sqlset_name       IN  VARCHAR2,
   populate_cursor   IN  sqlset_cursor,
   load_option       IN VARCHAR2 := 'INSERT', 
   update_option     IN VARCHAR2 := 'REPLACE', 
   update_condition  IN VARCHAR2 :=  NULL,
   update_attributes IN VARCHAR2 :=  NULL,
   ignore_null       IN BOOLEAN  :=  TRUE,
   commit_rows       IN POSITIVE :=  NULL,
   sqlset_owner      IN VARCHAR2 := NULL);
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oraclesql调优集(一)
