SQL生成AWR中的SQL ordered by Elapsed Time

最新推荐文章于 2025-08-11 16:16:37 发布

转载最新推荐文章于 2025-08-11 16:16:37 发布 · 257 阅读

本文提供了一种通过Oracle数据库的历史快照数据来分析SQL执行效率的方法，包括执行时间、CPU时间等指标，并展示了如何筛选出消耗资源最多的前10条SQL语句。

--提取&beg_snap 、&end_snap
select * from dba_hist_snapshot x ;

--提取&dbid
select * from v$database;

--提取$inst_num
select * from v$instance;

运行的时候输入上面的值(如果需要输入多次，那么输入同样值即可)

select *
from (select round(nvl((sqt.elap / 1000000), to_number(null)),2) "Elapsed Time (s)",
round( nvl((sqt.cput / 1000000), to_number(null)),2) "CPU Time (s)",
sqt.exec, round(decode(sqt.exec, 0, to_number(null),
(sqt.elap / sqt.exec / 1000000)),2) "Elap per Exec (s)",
round((100 * (sqt.elap / (select sum(e.value) - sum(b.value)
from dba_hist_sys_time_model b,
dba_hist_sys_time_model e
where b.snap_id = &beg_snap and
e.snap_id = &end_snap and
b.dbid = &dbid and
e.dbid = &dbid and
b.instance_number = &inst_num and
e.instance_number = &inst_num and
e.stat_name = 'DB time' and
b.stat_name = 'DB time'))) ,2) norm_val ,
sqt.sql_id,
decode(sqt.module, null, null, 'Module: ' || sqt.module) SqlModule,
nvl(to_nchar(SUBSTR(st.sql_text,1,2000)) , (' ** SQL Text Not Available ** ')) SqlText
from ( select sql_id,
max(module) module,
sum(elapsed_time_delta) elap,
sum(cpu_time_delta) cput,
sum(executions_delta) exec
from dba_hist_sqlstat
where dbid = &dbid and
instance_number = &inst_num and
&beg_snap < snap_id and
snap_id <= &end_snap
group by sql_id ) sqt,
dba_hist_sqltext st
where st.sql_id(+) = sqt.sql_id and
st.dbid(+) = &dbid
order by nvl(sqt.elap, -1) desc,
sqt.sql_id)
where rownum < 65 and
(rownum <= 10 or norm_val > 1);