Why user sessions are frequently blocked?

from the time that we did a database migration from oracle 8i to oracle 9i, and the application to developer 6i we have faced a new problem, ' the user sessions are frequently blocked'
anybody have any idea? it is a database parameter that must be changed?...
thnx,

Hi,
Since it was a migration from oracle 8i to oracle 9i, your performance is suppose to increase rather than decrease given condition that hardware and oracle configuration does not change.
How did you figure out that user sessions are frequently blocked?
You can query v$session_wait and check why it is blocked/waiting?
You can query v$locked_object to check if it is blocked for lock on some other objects?
Regards

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Sessions are in blocked state

Hi Gurus,
we are inserting data into one table and using append and parallel hints...but that query is not completed yet and those sessions are in blocked list.
can you please let me know how to overcome this issue and below is the query:
INSERT /*+ APPEND PARALLEL(emp 8) */ INTO emp_temp
(empno,empname,dateofjoining,deptno,sal)
SELECT /*+ PARALLEL(empn 8) */
empno,empname,dateofjoining,deptno,sum(sal) sal
FROM emp_V;
is it correct usage or anyother best way for improving performance.

Thanks for the response.
Below is the issue details more detailed:
We have created table with parallel degree 8 and I am not able to insert data into that table and the sessions are blocked state.
I am seeing event names in blocked state are px deq: parse reply px deq: execution msg
Temp_table -- parallel degree8
I am selecting the data from multiple tables as per my requirement and trying to insert that data into the temp table.
Below is the query:
Insert into /*+PARALLEL(Temp_table)*/ Temp_table(report_date,quantity,revenue)
select /*+PARALLEL(Temp_table_v)*/ report_date,quantity,revenue from Temp_table_v;
In Temp_table_v we are joined the multiple tables and those tables are having millions of records and in that view also we have added parallel hints.
Please help.

Essbase error 101 all 255 user sessions are in use

Hi There,
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essbase error 101 all 255 user sessions are in use
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You must be on an older version and licensing scheme of essbase where number of ports could be restricted by license. Try bouncing off essbase service and you should be able to connect.
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Why stale sessions are creating in Data Load Execution?

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Regards,
raj

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There a lot of accounts of apple,where are many games,these accounts are sold every day,i know that only 5 person can download one app,i want to know why this accounts are not blocked

There a lot of accounts of apple,where are many games,these accounts are sold every day,i know that only 5 person can download one app,i want to know why this accounts are not blocked

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BC4J View not Thread safe, user sessions are using the same view instance

Hi There,
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User Sessions are swapped

I have an application where users login and can view their personal information.
The server is iPlanet 4.1 sp8.
We are running JSP and Servlets on the webserver, Weblogic is the JAVA/EJB server.
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Make sure that you allow the plugin-container process in the firewall.
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Two sessions are blocked each other in

Hi All,
My database is Exadata machine. 11.2
These days we encountered one case, that is two sessions are always blocked by each other. I get this info from v$session blocking_session.
For examle, the information looks like
sid blocking_session event
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Best regards,
Leon

Leon,
sid blocking_session event
1 2 libarary cache lock
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/* QSMQ VALIDATION */ ALTER SUMMARY "XXXXX"."Gxxx_CP_CAL_TIME_TEMP_MV" COMPILE
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- Should the application not just be 'refreshing' the MV's instead of compiling them?
Just some thoughts.
Toon
Edit:
Dom's right. The alter summary statements seem to be Oracle internal calls generated by DBMS_MVIEW.REFRESH executions.
Edited by: Toon Koppelaars on Nov 24, 2011 10:41 AM

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Multiple session are open thought Users log out.

Hello Gurus,
I do see at CMC that many sessions are being open for many days even though users are logged out.
We are using SAP 4.0 (14.0.4) SP4. It's causing license issues and users are not able to log in.
We have restarted our VM's and clear the IE browsers as well but issue still remains.
Can you please help me on this.
Best Regards,
Sai

Hi Sai,
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Regards,
Loic

Why users are not able to see certain printers even though they are in the Airgroup server table

Q: Why users are not able to see only certain printers even though they are in the Airgroup server table ?
A: In certain scenarios we may notice printers come up under the server /cache entries on the controller.
However when an airgroup user does search for printer, they may not see all the printers, certain printers may be not visible .
This is because the service IDs sent by the user in the MDNS query are not broadcast by these printers
In the below capture the Ipad sends query for service id "_universal_sub_ipp_tcplocal" and "_universal_sub_ipps_tcplocal" and hence the controller will
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Non–Visible printer :
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hp LaserJet 4250 [ED487E]._printer._tcp.local SRV/NBSTAT IN 240 10.125.30.223 209.87 Wed Mar 18 13:24:26 2015
hp LaserJet 4250 [ED487E]._printer._tcp.local TXT IN 240 10.125.30.223 205.14 Wed Mar 18 13:24:26 2015
hp LaserJet 4250 [ED487E]._printer._tcp.local TXT IN 240 10.125.30.223 197.18 Wed Mar 18 13:24:26 2015
hp LaserJet 4250 [ED487E]._printer._tcp.local TXT IN 240 10.125.30.223 196.42 Wed Mar 18 13:24:26 2015
hp LaserJet 4250 [ED487E]._printer._tcp.local TXT IN 240 10.125.30.223 208.15 Wed Mar 18 13:24:26 2015
hp LaserJet 4250 [ED487E]._pdl-datastream._tcp.local SRV/NBSTAT IN 240 10.125.30.223 207.35 Wed Mar 18 13:24:26 2015
hp LaserJet 4250 [ED487E]._pdl-datastream._tcp.local TXT IN 240 10.125.30.223 200.64 Wed Mar 18 13:24:26 2015
hp LaserJet 4250 [ED487E]._ipp._tcp.local SRV/NBSTAT IN 240 10.125.30.223 209.44 Wed Mar 18 13:24:26 2015
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_universal._sub._ipp._tcp.local PTR IN 4500 10.125.26.29 3694.14 Wed Mar 18 13:24:51 2015
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Xerox WorkCentre 3615 (25:C5:2D)._ipp._tcp.local TXT IN 4500 10.125.26.29 3640.60 Wed Mar 18 13:24:51 2015
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Did it ever work?
Make sure the users have installed the certificate they need and turn on compatibility mode in IE (also make sure IE isn't locked down and disabling activeX).:
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-- Al

Sp_who2 -need only active sessions from users which are not the background sessions

Hello,
sp_who2 -need only active sessions from users which are not the background sessions
Please assist.
Best regards,
Vishal

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S.SESSION_ID,
S.STATUS,
S.HOST_NAME,
C.CLIENT_NET_ADDRESS,
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S.PROGRAM_NAME,
C.CONNECT_TIME,
S.LOGIN_TIME,
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WHEN 0 THEN 'UNSPECIFIED'
WHEN 1 THEN 'READUNCOMITTED'
WHEN 2 THEN 'READCOMMITTED'
WHEN 3 THEN 'REPEATABLE'
WHEN 4 THEN 'SERIALIZABLE'
WHEN 5 THEN 'SNAPSHOT'
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END AS TRANSACTION_ISOLATION_LEVEL_NAME,
S.LAST_SUCCESSFUL_LOGON,
S.LAST_UNSUCCESSFUL_LOGON,
S.UNSUCCESSFUL_LOGONS,
S.CPU_TIME AS CPU_TIME_MS,
S.MEMORY_USAGE AS MEMORY_USAGE_PAGES,
S.ROW_COUNT,
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S.LAST_REQUEST_START_TIME,
S.LAST_REQUEST_END_TIME,
C.NET_TRANSPORT,
C.PROTOCOL_TYPE,
S.LANGUAGE,
S.DATE_FORMAT,
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FROM
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Session 1648 is blocking 2 other sessions

Hi,
We are getting this Warning from the EM very frequently.
How can I know Which user process is blocking which session?
We are using 10.2.0.1.0 db in linux environment.
Can you please provide me the query or quide me to get which process is blocking by which process?
Thanks a lot in advance.
Thanks
Pathan

>
Can you please provide me the query or quide me to get which process is blocking by which process?There are two ways to do it,
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2) The same interface is given in CLI from ORacle supplied script under $OH/rdbms/admin/utlockt.sql. This would show the same results but in the sql prompt.
2a) There are three views that you can use to create your own script,
DBA_Blockers, DBA_waiters and V$locked_object ( already mentioned by last poster) .
HTH
Aman....

Why user sessions are frequently blocked?

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