Also... technically it’s transactions not sessions which hold locks. In some
niche circumstances, that can make a difference in how to identify.
Sent from my iPhone
On 30 Dec 2017, at 11:02, Niall Litchfield
<niall.litchfield@xxxxxxxxx<mailto:niall.litchfield@xxxxxxxxx>> wrote:
Is this a RAC database? You'll need to look also at the instance and
blocking_status columns in v$session to rely on the blocking_session column in
v$session.
https://docs.oracle.com/database/121/REFRN/GUID-28E2DC75-E157-4C0A-94AB-117C205789B9.htm#REFRN30223<https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.oracle.com%2Fdatabase%2F121%2FREFRN%2FGUID-28E2DC75-E157-4C0A-94AB-117C205789B9.htm%23REFRN30223&data=02%7C01%7C%7Ce5abce7a2d1649633ac408d54f74d750%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636502285600939613&sdata=YN6Yr5ej5RLhXTthDuzXIHv%2BTq2KGXX%2FFTJsFT93Rjc%3D&reserved=0>
IIRC EM12c also is not RAC aware in its blocking sessions page.
On Sat, Dec 30, 2017 at 3:07 AM, Eriovaldo Andrietta
<ecandrietta@xxxxxxxxx<mailto:ecandrietta@xxxxxxxxx>> wrote:
Hello,
I got an issue related to lock.
Now the daabase was re-started and the issue is solved.
But during investigation I did not get sucess to identify who were locking a
table.
A table is used like this:
SELECT ID FROM TABLE_BLA
where id = :1
for upate;
The query did not return the result and looking for lock using this query :
select s.sid, s.blocking_session, do.object_name,
row_wait_obj#, row_wait_file#, row_wait_block#, row_wait_row#,
dbms_rowid.rowid_create ( 1, ROW_WAIT_OBJ#, ROW_WAIT_FILE#,
ROW_WAIT_BLOCK#, ROW_WAIT_ROW# )
from v$session s, dba_objects do
where s.ROW_WAIT_OBJ# = do.OBJECT_ID
I saw the row_wait_obj#, ROW_WAIT_FILE#, ROW_WAIT_BLOCK# and ROW_WAIT_ROW#
values.
In this situation how can I find the blocker?
or
I used a lot of queries that show blocker and locked but without sucess to see
the blocker.
Regards
Eriovaldo
--
Niall Litchfield
Oracle DBA
http://www.orawin.info<https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.orawin.info&data=02%7C01%7C%7Ce5abce7a2d1649633ac408d54f74d750%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636502285600939613&sdata=mftmtNck9%2B16o4DQ2s0i3IDbgJgmSbOyXrzJtazs5B4%3D&reserved=0>
