oraclesql调优集(二)
---------*
---3.4 查看优化集相信信息
SELECT sqlset_name, elapsed_time
,cpu_time, buffer_gets, disk_reads, sql_text
FROM dba_sqlset_statements
WHERE sqlset_name = 'OCPYANG_STS';
************************************************************
4.查看内存中资源密集型的sql
************************************************************
---4.1 语法
DBMS_SQLTUNE.SELECT_CURSOR_CACHE (
basic_filter IN VARCHAR2 := NULL,
object_filter IN VARCHAR2 := NULL,
ranking_measure1 IN VARCHAR2 := NULL,
ranking_measure2 IN VARCHAR2 := NULL,
ranking_measure3 IN VARCHAR2 := NULL,
result_percentage IN NUMBER := 1,
result_limit IN NUMBER := NULL,
attribute_list IN VARCHAR2 := NULL)
RETURN sys.sqlset PIPELINED;
---4.2 从内存中选择读取磁盘超过1000000
SELECT sql_id, substr(sql_text,1,20), disk_reads
,cpu_time, elapsed_time
,buffer_gets, parsing_schema_name
FROM table(DBMS_SQLTUNE.SELECT_CURSOR_CACHE('disk_reads>1000000')
)
order by sql_id;
---4.3 查看内存中非sys账户用户CPU时间最长的10个查询
SELECT sql_id, substr(sql_text,1,120), disk_reads
,cpu_time, elapsed_time
,buffer_gets, parsing_schema_name
FROM table(
DBMS_SQLTUNE.SELECT_CURSOR_CACHE(
basic_filter => 'parsing_schema_name <> ''SYS'''
,ranking_measure1 => 'cpu_time'
,result_limit => 10
));
---4.4 查看内存中非sys账户运行返回时间超过1秒的
SELECT sql_id, substr(sql_text,1,120)
,disk_reads, cpu_time, elapsed_time
FROM table(DBMS_SQLTUNE.SELECT_CURSOR_CACHE('parsing_schema_name <> ''SYS''
AND elapsed_time > 1000000'))
ORDER BY sql_id;
---4.5 查看具体sql_id执行细节
SELECT *
FROM table(DBMS_SQLTUNE.SELECT_CURSOR_CACHE('sql_id = ''byzwu34haqkn4'''));
----4.6 各种案例
-- Select all statements in the cursor cache.
DECLARE
cur sys_refcursor;
BEGIN
OPEN cur FOR
SELECT value(P)
FROM table(DBMS_SQLTUNE.SELECT_CURSOR_CACHE) P;
-- Process each statement (or pass cursor to load_sqlset).
CLOSE cur;
END;/
-- Look for statements not parsed by SYS.
DECLARE
cur sys_refcursor;
BEGIN
OPEN cur for
SELECT VALUE(P)
FROM table(
DBMS_SQLTUNE.SELECT_CURSOR_CACHE('parsing_schema_name <>
''SYS''')) P;
-- Process each statement (or pass cursor to load_sqlset).
CLOSE cur;
end;/
-- All statements from a particular module/action.
DECLARE
cur sys_refcursor;
BEGIN
OPEN cur FOR
SELECT VALUE(P)
FROM table(
DBMS_SQLTUNE.SELECT_CURSOR_CACHE(
'module = ''MY_APPLICATION'' and action = ''MY_ACTION''')) P;
-- Process each statement (or pass cursor to load_sqlset)
CLOSE cur;
END;/
-- all statements that ran for at least five seconds
DECLARE
cur sys_refcursor;
BEGIN
OPEN cur FOR
SELECT VALUE(P)
FROM table(DBMS_SQLTUNE.SELECT_CURSOR_CACHE('elapsed_time > 5000000')) P;
-- Process each statement (or pass cursor to load_sqlset)
CLOSE cur;
end;/
-- select all statements that pass a simple buffer_gets threshold and
-- are coming from an APPS user
DECLARE
cur sys_refcursor;
BEGIN
OPEN cur FOR
SELECT VALUE(P)
FROM table(
DBMS_SQLTUNE.SELECT_CURSOR_CACHE(
'buffer_gets > 100 and parsing_schema_name = ''APPS'''))P;
-- Process each statement (or pass cursor to load_sqlset)
CLOSE cur;
end;/
-- select all statements exceeding 5 seconds in elapsed time, but also
-- select the plans (by default we only select execution stats and binds
-- for performance reasons - in this case the SQL_PLAN attribute of sqlset_row
-- is NULL)
DECLARE
cur sys_refcursor;
BEGIN
OPEN cur FOR
SELECT VALUE(P)
FROM table(d