Shulou(Shulou.com)06/01 Report--

The first step of this query is to understand the dba_hist_sqlstat view, that is, not all SQL can be queried in dba_hist_sqlstat:

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 statement

Time-consuming execution of b.etime

C.user_id user ID

C.SAMPLE_TIME execution time

Number of c.INSTANCE_NUMBER instances

U.username user name, a.sql_id SQL number

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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