Here are the execution plans and counts by qc_session_id. Why would oracle
compute auto DP of 1 and fire up a PQ coordinator?
1 select qc_sess, count(*) from
2 (select case qc_session_id when null then 'NULL' else 'NOT NULL' end
qc_sess
3 from dba_hist_active_sess_history
4 where sample_time >= TIMESTAMP'2018-06-28 18:45:00'
5 and sample_time <= TIMESTAMP'2018-06-29 00:00:00'
6 and sql_id = '0rz9dn5v75czn')
7* group by qc_sess
SQL> /
QC_SESS COUNT(*)
-------- ----------
NOT NULL 37535
However, both plans in AWR are adaptive. Not real sure about the automatic
DOP note either.
Plan hash value: 2901843923
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name
| Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | TQ
|IN-OUT| PQ Distrib |
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT |
| | | 31 (100)| | | | |
| |
| 1 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 2 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 3 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 4 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 5 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 6 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 7 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 8 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 9 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 10 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 11 | SORT ORDER BY |
| 1 | 2434 | 31 (7)| 00:00:01 | | | |
| |
| 12 | FILTER |
| | | | | | | |
| |
| 13 | NESTED LOOPS OUTER |
| 1 | 2434 | 15 (7)| 00:00:01 | | | |
| |
| 14 | HASH JOIN OUTER |
| 1 | 2429 | 14 (8)| 00:00:01 | | | |
| |
| 15 | HASH JOIN OUTER |
| 1 | 229 | 13 (0)| 00:00:01 | | | |
| |
| 16 | HASH JOIN |
| 1 | 225 | 12 (0)| 00:00:01 | | | |
| |
| 17 | NESTED LOOPS OUTER |
| 1 | 201 | 11 (0)| 00:00:01 | | | |
| |
| 18 | NESTED LOOPS OUTER |
| 1 | 191 | 10 (0)| 00:00:01 | | | |
| |
| 19 | NESTED LOOPS OUTER |
| 1 | 148 | 6 (0)| 00:00:01 | | | |
| |
| 20 | NESTED LOOPS |
| 1 | 120 | 5 (0)| 00:00:01 | | | |
| |
| 21 | NESTED LOOPS |
| 1 | 73 | 4 (0)| 00:00:01 | | | |
| |
| 22 | TABLE ACCESS BY INDEX ROWID | USER$
| 1 | 18 | 1 (0)| 00:00:01 | | | |
| |
| 23 | INDEX UNIQUE SCAN | I_USER1
| 1 | | 0 (0)| | | | |
| |
| 24 | TABLE ACCESS BY INDEX ROWID BATCHED| OBJ$
| 1 | 55 | 3 (0)| 00:00:01 | | | |
| |
| 25 | INDEX RANGE SCAN | I_OBJ5
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 26 | TABLE ACCESS CLUSTER | COL$
| 1 | 47 | 1 (0)| 00:00:01 | | | |
| |
| 27 | INDEX UNIQUE SCAN | I_OBJ#
| 1 | | 0 (0)| | | | |
| |
| 28 | TABLE ACCESS CLUSTER | COLTYPE$
| 1 | 28 | 1 (0)| 00:00:01 | | | |
| |
| 29 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 43 | 4 (0)| 00:00:01 | | | |
| |
| 30 | INDEX RANGE SCAN | I_OBJ3
| 23 | | 1 (0)| 00:00:01 | | | |
| |
| 31 | INDEX RANGE SCAN | I_HH_OBJ#_INTCOL#
| 1 | 10 | 1 (0)| 00:00:01 | | | |
| |
| 32 | INDEX FULL SCAN | I_USER2
| 1 | 24 | 1 (0)| 00:00:01 | | | |
| |
| 33 | INDEX FULL SCAN | I_USER2
| 1 | 4 | 1 (0)| 00:00:01 | | | |
| |
| 34 | VIEW | ALL_COL_COMMENTS
| 1 | 2200 | 1 (100)| 00:00:01 | | | |
| |
| 35 | FILTER |
| | | | | | | |
| |
| 36 | PX COORDINATOR |
| | | | | | | |
| |
| 37 | PX SEND QC (RANDOM) | :TQ10000
| 2 | 4478 | 1 (100)| 00:00:01 | | | Q1,00 | P->S
| QC (RAND) |
| 38 | PX PARTITION LIST ALL |
| 2 | 4478 | 1 (100)| 00:00:01 | 1 | 2 | Q1,00 | PCWC
| |
| 39 | EXTENDED DATA LINK FULL |
INT$DBA_COL_COMMENTS | 2 | 4478 | 1 (100)| 00:00:01 | |
| Q1,00 | PCWP | |
| 40 | NESTED LOOPS SEMI |
| 1 | 15 | 2 (0)| 00:00:01 | | | |
| |
| 41 | FIXED TABLE FULL | X$KZSRO
| 2 | 12 | 0 (0)| | | | |
| |
| 42 | INDEX RANGE SCAN | I_OBJAUTH2
| 1 | 9 | 1 (0)| 00:00:01 | | | |
| |
| 43 | TABLE ACCESS CLUSTER | TAB$
| 1 | 5 | 1 (0)| 00:00:01 | | | |
| |
| 44 | INDEX UNIQUE SCAN | I_OBJ#
| 1 | | 0 (0)| | | | |
| |
| 45 | TABLE ACCESS CLUSTER | TAB$
| 1 | 13 | 2 (0)| 00:00:01 | | | |
| |
| 46 | INDEX UNIQUE SCAN | I_OBJ#
| 1 | | 1 (0)| 00:00:01 | | | |
| |
| 47 | NESTED LOOPS SEMI |
| 1 | 15 | 2 (0)| 00:00:01 | | | |
| |
| 48 | FIXED TABLE FULL | X$KZSRO
| 2 | 12 | 0 (0)| | | | |
| |
| 49 | INDEX RANGE SCAN | I_OBJAUTH2
| 1 | 9 | 1 (0)| 00:00:01 | | | |
| |
| 50 | FIXED TABLE FULL | X$KZSPR
| 1 | 9 | 0 (0)| | | | |
| |
| 51 | TABLE ACCESS FULL | USER_EDITIONING$
| 1 | 6 | 2 (0)| 00:00:01 | | | |
| |
| 52 | TABLE ACCESS FULL | USER_EDITIONING$
| 1 | 6 | 2 (0)| 00:00:01 | | | |
| |
| 53 | NESTED LOOPS SEMI |
| 1 | 29 | 2 (0)| 00:00:01 | | | |
| |
| 54 | INDEX SKIP SCAN | I_USER2
| 1 | 20 | 1 (0)| 00:00:01 | | | |
| |
| 55 | INDEX RANGE SCAN | I_OBJ4
| 1 | 9 | 1 (0)| 00:00:01 | | | |
| |
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
Peeked Binds (identified by position):
--------------------------------------
1 - :TABLE_NAME (VARCHAR2(30), CSID=873): 'X15_L1DbProtoVisits'
2 - :OWNER (VARCHAR2(30), CSID=873): 'LSST_ALERTS'
Note
-----
- automatic DOP: Computed Degree of Parallelism is 1 because of parallel
threshold
- this is an adaptive plan
Plan hash value: 1846450148
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name
| Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | TQ
|IN-OUT| PQ Distrib |
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT |
| | | 31 (100)| | | | |
| |
| 1 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 2 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 3 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 4 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 5 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 6 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 7 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 8 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 9 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 39 | 3 (0)| 00:00:01 | | | |
| |
| 10 | INDEX RANGE SCAN | I_OBJ1
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 11 | SORT ORDER BY |
| 1 | 2434 | 31 (7)| 00:00:01 | | | |
| |
| 12 | FILTER |
| | | | | | | |
| |
| 13 | NESTED LOOPS OUTER |
| 1 | 2434 | 15 (7)| 00:00:01 | | | |
| |
| 14 | HASH JOIN OUTER |
| 1 | 2429 | 14 (8)| 00:00:01 | | | |
| |
| 15 | HASH JOIN OUTER |
| 1 | 229 | 13 (0)| 00:00:01 | | | |
| |
| 16 | HASH JOIN |
| 1 | 225 | 12 (0)| 00:00:01 | | | |
| |
| 17 | HASH JOIN OUTER |
| 1 | 201 | 11 (0)| 00:00:01 | | | |
| |
| 18 | HASH JOIN OUTER |
| 1 | 191 | 10 (0)| 00:00:01 | | | |
| |
| 19 | NESTED LOOPS OUTER |
| 1 | 148 | 6 (0)| 00:00:01 | | | |
| |
| 20 | NESTED LOOPS |
| 1 | 120 | 5 (0)| 00:00:01 | | | |
| |
| 21 | NESTED LOOPS |
| 1 | 73 | 4 (0)| 00:00:01 | | | |
| |
| 22 | TABLE ACCESS BY INDEX ROWID | USER$
| 1 | 18 | 1 (0)| 00:00:01 | | | |
| |
| 23 | INDEX UNIQUE SCAN | I_USER1
| 1 | | 0 (0)| | | | |
| |
| 24 | TABLE ACCESS BY INDEX ROWID BATCHED| OBJ$
| 1 | 55 | 3 (0)| 00:00:01 | | | |
| |
| 25 | INDEX RANGE SCAN | I_OBJ5
| 1 | | 2 (0)| 00:00:01 | | | |
| |
| 26 | TABLE ACCESS CLUSTER | COL$
| 1 | 47 | 1 (0)| 00:00:01 | | | |
| |
| 27 | INDEX UNIQUE SCAN | I_OBJ#
| 1 | | 0 (0)| | | | |
| |
| 28 | TABLE ACCESS CLUSTER | COLTYPE$
| 1 | 28 | 1 (0)| 00:00:01 | | | |
| |
| 29 | TABLE ACCESS BY INDEX ROWID BATCHED | OBJ$
| 1 | 43 | 4 (0)| 00:00:01 | | | |
| |
| 30 | INDEX SKIP SCAN | I_OBJ1
| 23 | | 1 (0)| 00:00:01 | | | |
| |
| 31 | INDEX FAST FULL SCAN | I_HH_OBJ#_INTCOL#
| 1 | 10 | 1 (0)| 00:00:01 | | | |
| |
| 32 | INDEX FULL SCAN | I_USER2
| 1 | 24 | 1 (0)| 00:00:01 | | | |
| |
| 33 | INDEX FULL SCAN | I_USER2
| 1 | 4 | 1 (0)| 00:00:01 | | | |
| |
| 34 | VIEW | ALL_COL_COMMENTS
| 1 | 2200 | 1 (100)| 00:00:01 | | | |
| |
| 35 | FILTER |
| | | | | | | |
| |
| 36 | PX COORDINATOR |
| | | | | | | |
| |
| 37 | PX SEND QC (RANDOM) | :TQ10000
| 2 | 4478 | 1 (100)| 00:00:01 | | | Q1,00 | P->S
| QC (RAND) |
| 38 | PX PARTITION LIST ALL |
| 2 | 4478 | 1 (100)| 00:00:01 | 1 | 2 | Q1,00 | PCWC
| |
| 39 | EXTENDED DATA LINK FULL |
INT$DBA_COL_COMMENTS | 2 | 4478 | 1 (100)| 00:00:01 | |
| Q1,00 | PCWP | |
| 40 | NESTED LOOPS SEMI |
| 1 | 15 | 2 (0)| 00:00:01 | | | |
| |
| 41 | FIXED TABLE FULL | X$KZSRO
| 2 | 12 | 0 (0)| | | | |
| |
| 42 | INDEX RANGE SCAN | I_OBJAUTH2
| 1 | 9 | 1 (0)| 00:00:01 | | | |
| |
| 43 | TABLE ACCESS CLUSTER | TAB$
| 1 | 5 | 1 (0)| 00:00:01 | | | |
| |
| 44 | INDEX UNIQUE SCAN | I_OBJ#
| 1 | | 0 (0)| | | | |
| |
| 45 | TABLE ACCESS CLUSTER | TAB$
| 1 | 13 | 2 (0)| 00:00:01 | | | |
| |
| 46 | INDEX UNIQUE SCAN | I_OBJ#
| 1 | | 1 (0)| 00:00:01 | | | |
| |
| 47 | NESTED LOOPS SEMI |
| 1 | 15 | 2 (0)| 00:00:01 | | | |
| |
| 48 | FIXED TABLE FULL | X$KZSRO
| 2 | 12 | 0 (0)| | | | |
| |
| 49 | INDEX RANGE SCAN | I_OBJAUTH2
| 1 | 9 | 1 (0)| 00:00:01 | | | |
| |
| 50 | FIXED TABLE FULL | X$KZSPR
| 1 | 9 | 0 (0)| | | | |
| |
| 51 | TABLE ACCESS FULL | USER_EDITIONING$
| 1 | 6 | 2 (0)| 00:00:01 | | | |
| |
| 52 | TABLE ACCESS FULL | USER_EDITIONING$
| 1 | 6 | 2 (0)| 00:00:01 | | | |
| |
| 53 | NESTED LOOPS SEMI |
| 1 | 29 | 2 (0)| 00:00:01 | | | |
| |
| 54 | INDEX SKIP SCAN | I_USER2
| 1 | 20 | 1 (0)| 00:00:01 | | | |
| |
| 55 | INDEX RANGE SCAN | I_OBJ4
| 1 | 9 | 1 (0)| 00:00:01 | | | |
| |
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
Peeked Binds (identified by position):
--------------------------------------
1 - :TABLE_NAME (VARCHAR2(30), CSID=873): 'X15_DiaObject'
2 - :OWNER (VARCHAR2(30), CSID=873): 'LSST_ALERTS'
Note
-----
- automatic DOP: Computed Degree of Parallelism is 1 because of parallel
threshold
- statistics feedback used for this statement
- this is an adaptive plan
On Sat, Jun 30, 2018 at 6:35 AM Chris Stephens <cstephens16@xxxxxxxxx>
wrote:
Thanks so much for taking the time to look at this. Yes, this is a single
tenant CDB/PDB.
The developer reworked the code to eliminate the metadata queries and
problem vanished.
I’ll have access to the system tomorrow and will check and let you know
what I find. ..assuming ASH data is still around.
Thanks again!
On Sat, Jun 30, 2018 at 4:16 AM Jonathan Lewis <
jonathan@xxxxxxxxxxxxxxxxxx> wrote:
Is this a PDB running inside a CDB, or is it a non-PDB database ?
Have you checked the execution plan for the query.
Running on a PDB inside a CDB (which is all I can get hands on at the
moment) I can see that there's a cross database call which causes parallel
servers to start up. It's possible that the the issue with cursor pinning
is a side effect of this parallelism; when I ran the query it was one of my
PX slaves that had happened to wait on 'cursor: pin S wait on X'.
A quick check on ASH to see if the parallelism is a problem would be to
split the counts for the wait into one ones where qc_session_id was null
(the query coordinators) and qc_session_id is not null (PX slaves).
I don't know what the parallelism is for - but possibly the effect is
made worse by the presence of RAC - perhaps some of the slaves are being
allocated remotely when ideally they should be allocated locally.
The other problem, of course, is that the data is likely to be extremely
skewed for a few owners - so the optimizer probably does a lot of work
calculating inflection points (my plan show 6 possible inflection points).
Have you checked the data dictionary to see if the stats are reasonably
accurate, and whether you could create some column groups that might help
the optimizer get better estimates of cardinality. Anything which reduces
actual optimisation time might help.
Regards
Jonathan Lewis
________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> on
behalf of Chris Stephens <cstephens16@xxxxxxxxx>
Sent: 29 June 2018 15:26:23
To: oracle-l
Subject: cursor: pin S wait on X querying data dictionary
3-node RAC 12.2 database on Centos7
We have an application which makes use of SQLAlchemy that is suffering
mightily from "cursor: pin S wait on X" executing the following SQL:
SELECT col.column_name, col.data_type, col.char_length,
col.data_precision, col.data_scale, col.nullable,
col.data_default, com.comments
FROM all_tab_columns col
LEFT JOIN all_col_comments com
ON col.table_name = com.table_name
AND col.column_name = com.column_name
AND col.owner = com.owner
WHERE col.table_name = :table_name
AND col.owner = :owner ORDER BY col.column_id
The application will launch ~200 concurrent sessions on startup. There is
a long initial period where many of them are waiting on the event then
things start clearing up and processing proceeds as expected. There are
several different plan hash values for the SQL, one of which didn't seem to
suffer from the issue so I created a sql baseline and crossed my fingers.
I've collected dictionary statistics as well but that made no difference.
While I do my own searching, does any one have any suggestions on how to
remove the delays?
Here is some ASH data showing the issue:
SQL> @ashtop sql_id,event "sql_id='0rz9dn5v75czn'" "TIMESTAMP'2018-06-28
18:45:00'" "TIMESTAMP'2018-06-29 00:00:00'"
Total
Seconds AAS %This SQL_ID EVENT
FIRST_SEEN LAST_SEEN DIST_SQLEXEC_SEEN
--------- ------- ------- -------------
---------------------------------------- -------------------
------------------- -----------------
75469 4.0 84% | 0rz9dn5v75czn cursor: pin S wait on X
2018-06-28 20:11:34 2018-06-28 20:38:54 1
6441 .3 7% | 0rz9dn5v75czn library cache lock
2018-06-28 20:11:41 2018-06-28 20:38:36 1
6243 .3 7% | 0rz9dn5v75czn kksfbc child completion
2018-06-28 20:11:44 2018-06-28 20:38:43 1
1592 .1 2% | 0rz9dn5v75czn
2018-06-28 20:11:34 2018-06-28 20:38:55 105
182 .0 0% | 0rz9dn5v75czn cursor: pin S
2018-06-28 20:12:34 2018-06-28 20:38:34 1
133 .0 0% | 0rz9dn5v75czn library cache: mutex X
2018-06-28 20:12:09 2018-06-28 20:38:32 1
18 .0 0% | 0rz9dn5v75czn enq: PS - contention
2018-06-28 20:13:17 2018-06-28 20:38:55 18
15 .0 0% | 0rz9dn5v75czn cursor: pin X
2018-06-28 20:13:41 2018-06-28 20:38:36 1
select snap_id, end_interval_time
8 .0 0% | 0rz9dn5v75czn PGA memory operation
2018-06-28 20:15:24 2018-06-28 20:38:44 1
2 .0 0% | 0rz9dn5v75czn PX Deq: Join ACK
2018-06-28 20:13:26 2018-06-28 20:32:12 2
1 .0 0% | 0rz9dn5v75czn row cache read
2018-06-28 20:35:18 2018-06-28 20:35:18 1
11 rows selected.
SQL> @ashtop session_id,sql_id,event "sql_id='0rz9dn5v75czn'"
"TIMESTAMP'2018-06-28 18:45:00'" "TIMESTAMP'2018-06-29 00:00:00'"
Total
Seconds AAS %This SESSION_ID SQL_ID EVENT
FIRST_SEEN LAST_SEEN DIST_SQLEXEC_SEEN
--------- ------- ------- ---------- -------------
---------------------------------------- -------------------
------------------- -----------------
934 .0 1% | 2065 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:34 2018-06-28 20:37:03 1
925 .0 1% | 1459 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:34 2018-06-28 20:35:26 1
917 .0 1% | 613 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:13:26 2018-06-28 20:38:53 1
893 .0 1% | 4360 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:34 2018-06-28 20:38:45 1
873 .0 1% | 973 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:44 2018-06-28 20:38:26 1
861 .0 1% | 3276 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:44 2018-06-28 20:38:44 1
854 .0 1% | 3877 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:34 2018-06-28 20:38:52 1
828 .0 1% | 4602 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:44 2018-06-28 20:38:50 1
827 .0 1% | 2547 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:34 2018-06-28 20:38:47 1
826 .0 1% | 491 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:44 2018-06-28 20:38:44 1
823 .0 1% | 251 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:15:06 2018-06-28 20:38:51 1
818 .0 1% | 2790 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:15:06 2018-06-28 20:38:35 1
798 .0 1% | 124 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:44 2018-06-28 20:32:06 1
761 .0 1% | 129 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:34 2018-06-28 20:38:45 1
745 .0 1% | 6 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:44 2018-06-28 20:38:51 1
734 .0 1% | 738 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:44 2018-06-28 20:37:01 1
731 .0 1% | 123 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:13:24 2018-06-28 20:38:37 1
730 .0 1% | 4117 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:11:34 2018-06-28 20:38:43 1
726 .0 1% | 1216 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:17:17 2018-06-28 20:38:52 1
710 .0 1% | 3 0rz9dn5v75czn cursor: pin S wait on
X 2018-06-28 20:16:46 2018-06-28 20:36:23 1
20 rows selected.
SQL> select distinct(plan_hash_value) from dba_hist_sqlstat where sql_id
= '0rz9dn5v75czn' and snap_id >= 2378;
PLAN_HASH_VALUE
---------------
2901843923
1846450148
0
SQL> l
1 select plan_name, last_executed, enabled, accepted, fixed, executions
2 from dba_sql_plan_baselines
3* where sql_text like '%col.column_name, col.data_type,
col.char_length%'
SQL> /
PLAN_NAME LAST_EXECUTED ENABLED ACCEPTED FIXED EXECUTIONS
---------------------------------------- -------------------- ----------
---------- ---------- ----------
SQL_PLAN_78xa0f27qf69ye98653aa YES YES YES 38562
Anyone have any ideas?
Thanks as always!
