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這個查詢首先得理解dba_hist_sqlstat視圖，也就是并不是所有SQL都在dba_hist_sqlstat里都能查詢：
DBA_HIST_SQLSTAT displays historical information about SQL statistics. This view captures the top SQL statements based on a set of criteria and captures the statistics information from V$SQL. The total value is the value of the statistics since instance startup. The delta value is the value of the statistics from the BEGIN_INTERVAL_TIME to the END_INTERVAL_TIME in the DBA_HIST_SNAPSHOT view.
ELAPSED_TIME_DELTA：
Delta value of elapsed time (in microseconds) used by this cursor for parsing/executing/fetching
select a.sql_text SQL語句,
b.etime 執行耗時,
c.user_id 用戶ID,
c.SAMPLE_TIME 執行時間,
c.INSTANCE_NUMBER 實例數,
u.username 用戶名, a.sql_id SQL編號
from dba_hist_sqltext a,
(select sql_id, ELAPSED_TIME_DELTA / 1000000 as etime
from dba_hist_sqlstat
where ELAPSED_TIME_DELTA / 1000000 >= 1) b,
dba_hist_active_sess_history c,
dba_users u
where a.sql_id = b.sql_id
and u.username = 'MYDB'
and c.user_id = u.user_id
and b.sql_id = c.sql_id
and a.sql_text like '%XXX%'
order by SAMPLE_TIME desc,
b.etime desc;
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