Question

orcl_Sessiions

Asked by: sam15

1. Does anyone how oracle 9i  changes STATUS for sessions from ACTIVE to INACTIVE?
2. We have an issue with some "web" sessions coming from mod_plsql statying active for 2-3 hours. Any idea what would keep them there? can some bad sql cause this issue?
3. can i see the SQL code associated with a session from any view?

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Asked On
2009-11-06 at 15:32:08ID24879628
Tags

oracle

Topics

Oracle 9.x

,

Oracle 10.x

,

Apache Web Server

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Answers

 

by: HainKurtPosted on 2009-11-06 at 15:43:10ID: 25764078

if you have toad, you can use it to view sessions, and the queries issued for each session...

or use oracle tool if you have it

http://download.oracle.com/docs/cd/B19306_01/server.102/b28051/tdppt_realtime.htm

 

by: sam15Posted on 2009-11-06 at 15:48:20ID: 25764097

how in toad 8.6 you do it? but a session can have 100 sql statements. would it show you all.

 

by: HainKurtPosted on 2009-11-06 at 16:05:52ID: 25764209

there should be session  Browser
I guess it is in dba module, it shows lots of information to monitor the sessions, kill, to see running queries (maybe not all queries, for that one I guess you need to to turn on tracing in oracle), but it is really useful if you have this module...

 

by: HainKurtPosted on 2009-11-06 at 16:11:38ID: 25764226

TOAD has lots of extra modules, and DBA module is one of them and I think Session browser is in DBA module, but you can install a trial one to test it for 30 or 45 days...

 

by: sam15Posted on 2009-11-06 at 16:58:54ID: 25764434

well toad must be geting it from an oracle view..
i do not have dba nor can install on this pc.

 

by: HainKurtPosted on 2009-11-06 at 17:10:03ID: 25764473

ok, i grabbed the sql statements of TOAD for you, check them I am sure you will find them useful...

SELECT  AUDSID, Client_Info, Command, Last_Call_ET, LockWait, Logon_Time, Machine, Module, OSUser, PADDR, Process, Program, SchemaName, Serial#, Server, SID, Status, Terminal, Type, Action, UserName, Failover_Method, Failed_Over, Failover_Type, PDML_Enabled, PDDL_Status, PDML_Status, PQ_Status, Resource_Consumer_Group, SQL_Child_Number, SQL_ID
FROM V$SESSION s
WHERE ( sid = '38')
 AND  ( (s.USERNAME is not null) and (NVL(s.osuser,'x') <> 'SYSTEM') and (s.type <> 'BACKGROUND') )
 
SELECT  * FROM V$PROCESS WHERE  (addr = '3FD35D44')
 
SELECT  * FROM V$SESS_IO WHERE  sid = '38'
 
SELECT  SID, SEQ#,EVENT,WAIT_TIME,SECONDS_IN_WAIT, STATE FROM v$session_wait WHERE  sid = '38'
 
SELECT  ROWNUM, EVENT,TOTAL_WAITS,TOTAL_TIMEOUTS,TIME_WAITED,AVERAGE_WAIT , MAX_WAIT, TIME_WAITED_MICRO FROM v$session_event WHERE  sid = '38'
 
select decode(sql_hash_value, 0, prev_hash_value, sql_hash_value) hash
       , decode(sql_id, null, prev_sql_id, sql_id) sql_id
from v$session
where sid = :sid
sid = '38'
 
SELECT SQL_TEXT FROM  V$SQLTEXT_WITH_NEWLINES WHERE
HASH_VALUE=TO_NUMBER(:hash) ORDER BY PIECE
hash = '2380370066'
 
select 
       o.sid, o.sql_text, o.address, o.hash_value, o.user_name, s.schemaname
from   v$open_cursor o, v$session s
where  o.saddr = s.saddr
and    o.sid = s.sid
and   ( O.SID = '38')
 
SELECT SQL_TEXT FROM V$SQLTEXT_WITH_NEWLINES WHERE 
HASH_VALUE=TO_NUMBER(:hash) ORDER BY PIECE
hash = '4060026339'
 
alter session set current_schema = SYS
 
Select *
from v$sql_plan
Where hash_value = :sqlhv
and child_number =:cn
order by id
sqlhv = '4060026339'
cn = 0
 
alter session set current_schema = HAINKURT
 
SELECT  sid, owner, type, object FROM v$access WHERE  sid = '38'
 
Select         lk.SID, se.username, se.OSUser, se.Machine,  DECODE(lk.TYPE,         'TX', 'Transaction',         'TM', 'DML',         'UL', 'PL/SQL User Lock',          lk.TYPE  ) lock_type,  DECODE(lk.lmode,         0, 'None',         1, 'Null',         2, 'Row-S (SS)',         3, 'Row-X (SX)',         4, 'Share',         5, 'S/Row-X (SSX)',         6, 'Exclusive',         TO_CHAR(lk.lmode)  ) mode_held,  DECODE(lk.request,         0, 'None',         1, 'Null',         2, 'Row-S (SS)',         3, 'Row-X (SX)',         4, 'Share',         5, 'S/Row-X (SSX)',         6, 'Exclusive',         TO_CHAR(lk.request)  ) mode_requested,  TO_CHAR(lk.id1) lock_id1,  TO_CHAR(lk.id2) lock_id2,  decode(block, 0, 'No', 1, 'Yes', 2, 'Global') block, se.lockwait FROM v$lock lk, v$session se WHERE (lk.type = 'TX')  AND (lk.SID = se.SID) AND ( lk.sid = '38')
 
Select         lk.SID, se.username, se.OSUser, se.Machine,        DECODE (lk.TYPE,                'TX', 'Transaction',                'TM', 'DML',                'UL', 'PL/SQL User Lock',                lk.TYPE               ) lock_type,        DECODE (lk.lmode,                0, 'None',                1, 'Null',                2, 'Row-S (SS)',                3, 'Row-X (SX)',                4, 'Share',                5, 'S/Row-X (SSX)',                6, 'Exclusive',                TO_CHAR (lk.lmode)               ) mode_held,        DECODE (lk.request,                0, 'None',                1, 'Null',                2, 'Row-S (SS)',                3, 'Row-X (SX)',                4, 'Share',                5, 'S/Row-X (SSX)',                6, 'Exclusive',                TO_CHAR (lk.request)               ) mode_requested,        TO_CHAR (lk.id1) lock_id1, TO_CHAR (lk.id2) lock_id2, ob.owner,        ob.object_type, ob.object_name, decode(lk.Block, 0, 'No', 1, 'Yes', 2, 'Global') block, se.lockwait   FROM v$lock lk, dba_objects ob, v$session se  WHERE    lk.TYPE IN ('TM','UL')    AND lk.SID = se.SID    AND lk.id1 = ob.object_id (+)  AND ( lk.sid = '38')
 
SELECT  SID,  decode(totalwork, 0, 0, round(100 * sofar/totalwork, 2)) "Percent", message "Message", start_time, elapsed_seconds, time_remaining  from v$Session_longops where  ( sid = 38 and serial# = 23)  ORDER BY SID
 
SELECT  a.sid, decode(b.class,1,'User',2,'Redo',4,'Enqueue',8,'Cache',16,'OS',32,'ParallelServer',64,'SQL',128,'Debug',72,'SQL & Cache',40,'ParallelServer & Cache')  class,b.name,a.value from v$sesstat a, v$statname b where (a.statistic#=b.statistic#) and  sid = '38'
 
SELECT  a.sid, decode(b.class,1,'User',2,'Redo',4,'Enqueue',8,'Cache',16,'OS',32,'ParallelServer',64,'SQL',128,'Debug',72,'SQL & Cache',40,'ParallelServer & Cache')  class,b.name,a.value from v$sesstat a, v$statname b where (a.statistic#=b.statistic#) and  sid = '29'
                                              
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by: HainKurtPosted on 2009-11-06 at 17:11:06ID: 25764480

in those queries 38 is my SID

 

by: sam15Posted on 2009-11-07 at 10:07:27ID: 25767314

thanks, lot of queries. is this just to see the sql executed by that session that keeps it active.
if you run a procedure using that session that has 10 sql statements would it show you everything or just the current sql it is running.

 

by: HainKurtPosted on 2009-11-07 at 18:35:54ID: 25769199

I guess it is showing last or the active one, I did not check the queries, maybe there is a condition to get the last one... If these queries (you should check each one carefully, play with values, remove conditions and see whole picture) does not help you, you need to have the right tools, which does all the job for you and just gives what you want :)

 

by: sam15Posted on 2009-11-07 at 21:27:58ID: 25769504

ok, thanks, a small question

if the query is "select * from EMP" the session will show ACTIVE until it is done.
then it shows INACTIVE. correct?
when does oracle remove that session/process so it gets used by someone else.
my main problem now is that those INACTIVE sessions are staying there and blocking new web httpd session coming in. any ideas why?

 

by: HainKurtPosted on 2009-11-07 at 21:37:15ID: 25769518

here is some definitions from oracle

If the session is not making a SQL call to Oracle (is INACTIVE)
When an inactive session has been terminated, STATUS in the V$SESSION view is KILLED.
A session is ACTIVE when it is making a SQL call to Oracle. A session is INACTIVE if it is not making a SQL call to Oracle.

read this, lots of useful info... http://download.oracle.com/docs/cd/B10501_01/server.920/a96521/manproc.htm#1960

 

by: sam15Posted on 2009-11-07 at 22:08:26ID: 25769571

great

do you know how long oracle keeps "inactive" session which is holding a process in the system before it disconnects it automatically?
DO you think there might be something wrong if those inactive sessions stay there for hours/days?
not sure of MOD_PLSQL should clean them up or oracle database. unless oracle might resuse this idle session for another request from another machine but i doubt it.

20120131-EE-VQP-002

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