如何从 ASH 找到消耗 PGA 和 临时表空间 较多的 Top SQL_ID (Doc ID 2610646.1)

如何从 ASH 找到消耗 PGA 和 临时表空间 较多的 Top SQL_ID (Doc ID 2610646.1)

适用于:

Oracle Database - Enterprise Edition - 版本 11.2.0.1 和更高版本
本文档所含信息适用于所有平台

目标

提供一些诊断脚本，用于从 ASH 中找到最消耗 PGA 或者临时段的 sql_id。

这有助于诊断 ORA-1652 错误。

解决方案

最消耗 PGA 的 sql_id：

select *
from (select instance_number, sql_id, max(pga_sum_mb) pga_max
        from (select instance_number, sample_time, sql_id, round(sum(nvl(pga_allocated, 0))/1024/1024) pga_sum_mb
                from dba_hist_active_sess_history
               where sample_time between to_timestamp('&begin_timestamp', 'yyyy/mm/dd hh24:mi') and to_timestamp('&end_timestamp', 'yyyy/mm/dd hh24:mi')
            group by instance_number, sample_time, sql_id)
       group by instance_number, sql_id
       order by pga_max desc)
where rownum <= 10;

Enter value for begin_timestamp: 2019/12/10 08:00
Enter value for end_timestamp: 2019/12/10 11:00

INSTANCE_NUMBER SQL_ID           PGA_MAX
--------------- ------------- ----------
              2                       26
              2 1cq3qr774cu45          3
              2 18wpbpn3a2ypc          2
              2 84qp2j10cw7qs          2
              2 63zy2j74j3z7z          2
              2 4nxyknq1awbrd          1

最消耗临时段的 sql_id：

select *
from (select instance_number, sql_id, max(temp_sum_mb) temp_max
        from (select instance_number, sample_time, sql_id, round(sum(nvl(temp_space_allocated, 0))/1024/1024) temp_sum_mb
                from dba_hist_active_sess_history
               where sample_time between to_timestamp('&begin_timestamp', 'yyyy/mm/dd hh24:mi') and to_timestamp('&end_timestamp', 'yyyy/mm/dd hh24:mi')
            group by instance_number, sample_time, sql_id)
       group by instance_number, sql_id
       order by temp_max desc)
where rownum <= 10;  

Enter value for begin_timestamp: 2019/12/10 08:00
Enter value for end_timestamp: 2019/12/10 11:00

INSTANCE_NUMBER SQL_ID          TEMP_MAX
--------------- ------------- ----------
              2                        0
              2 18wpbpn3a2ypc          0
              2 1cq3qr774cu45          0
              2 4nxyknq1awbrd          0
              2 63zy2j74j3z7z          0
              2 84qp2j10cw7qs          0