Server Administration :: High CPU For Inactive Session?
Nov 22, 2012
when I was analyzing high CPU utilization issue, I saw that the most of the top PID's were INACTIVE in database. But it was utilizing more than 4% CPU. how it is utilizing CPU without doing any work in database?
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
24013 oracle 2167M 1581M sleep 53 0 0:01:53 20% oracle/1
13260 oracle 2167M 1580M sleep 30 0 0:01:16 14% oracle/1
24399 oracle 2167M 1582M sleep 59 0 0:03:01 4.2% oracle/1
11509 oracle 2178M 1593M sleep 59 0 0:02:10 2.8% oracle/11
[code].....
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Mar 4, 2010
I am using 10.2.0.4 oracle database on Solaris 10. We are running some Peoplesoft upgrade on one of the database from last 6-7 hours. The status of the session is INACTIVE from couple of hours. And the sql_id is null for these sessions.
select sid,serial#,STATUS,to_char(logon_time,'DD-MON_YY HH24:MI:SS') from v$session where username like '%&usern%' ORDER BY 4 DESC;
533 2234 INACTIVE 04-MAR_10 01:59:02
525 5919 ACTIVE 04-MAR_10 01:54:50
534 4186 INACTIVE 04-MAR_10 01:05:15
520 2320 INACTIVE 04-MAR_10 00:29:44
[code].....
While when i see the current sql from the v$active_session_history, it keep on changing after every 10-15 minutes. Using below query to find the sql_text for the session from v$active_session_history.
select sql_id, sql_text
from v$sql
where sql_id in (
select sql_id
from v$active_session_history
where session_id=511
[code].....
We have not faced issue like this during Peoplesoft upgrade. what could be the reason that the status is not changing while the base sqls keep on changing after every 10 minutes.
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Mar 5, 2013
I am trying use host command in Oracle forms. I get the process id as input from the user and on clicking ok the form should kill the session related to process id.
PS: Users will be entering only frmweb.exe process id which are inactive.
cmd := 'CMD /C taskkill /F /FI /pid 'process which is got as input' /IM frmweb.exe'; host(cmd)I also tried by writing the above command into a .bat file in application server.When trying to execute the bat file it din work. But when tryin to run the bat file by double clicking in Application server the session was killed.
On executing the above I am unable to kill the process. I would also like to know whether the host command was successful or not. Orakill and alter session are working but I don want to use it.
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Jul 1, 2012
want to know the following
1. when the oracle session changed from active to inactive?
2. what is the time for active session?
3. session is changed to inactive from active. but it is still showing in v$session.
4. in v$session, can i see the ipaddress of client machine ?
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Jan 7, 2013
Redo is getting generated very high. how to find out the reason ? database kept under 2 node cluster. chcked alert log trace and log writer trace files. pasted the content as below:
--alert log trace from node1 ( node2 also has same type of message ). Archive destination disk group - TXCOM_BACKUP_01 having enough space ( 80gb )
Mon Jan 7 00:49:10 2013
Thread 1 advanced to log sequence 448546 (LGWR switch)
Current log# 1 seq# 448546 mem# 0: +TXCOM_DATA_01/txcom/onlinelog/group_1.274.785770579
Current log# 1 seq# 448546 mem# 1: +TXCOM_DATA_01/txcom/onlinelog/group_1.302.802265189
Mon Jan 7 00:49:10 2013
[code]...
In the alert log, I am able to see the archive destination disk group ( TXCOM_BACKUP_01 ) is getting DISMOUNTED and again getting MOUNTED during every archive file generation. .
Mon Jan 7 00:49:20 2013
SUCCESS: diskgroup TXCOM_BACKUP_01 was mounted
SUCCESS: diskgroup TXCOM_BACKUP_01 was dismounted
SUCCESS: diskgroup TXCOM_BACKUP_01 was mounted
SUCCESS: diskgroup TXCOM_BACKUP_01 was dismounted
archive destination parameter in both nodes are not configured. it should read diskgroup name. ( +TXCOM_BACKUP_01 ) and corresponding size limit. Should i configure this ?
SQL> show parameter db_recovery
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string
db_recovery_file_dest_size big integer 0
[code]...
should i bring the database to mount stage and set log_archive_max_proesses to high count ? now value is 2 ( default )
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Nov 11, 2011
I have deleted lot of records in a table.Would oracle be able to insert in the empty blocks generated from deletion of records without bringing the high water mark down.
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Sep 2, 2011
I have installed Oracle Database 11g.2 by database configuration assistant on windows XP as and adminstrator on my laptop(no connection to network),but when I want to create database I face this warning: error securing database control ,Datatbase control has been brought up in non-secure mode . to secure the database conntrol execute following command....(error is attached).
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Jun 10, 2013
I have one tablespace called U01. This tablepspace contains 31 data files. Due to high water mark I was unable to most datafiles. Since my database running onair application they will not provide me downtime to move the tables. Is there anyway to fix the high water mark without getting downtime window? almost 700+g space unused. I need to reuse them asap because running out of space with in asm diskgroup.
SQL> SELECT A.TABLESPACE_NAME,round(SUM(A.TOTS)/1024/1024) "Tot size MB",
2 round(SUM(A.SUMB)/1024/1024) "Tot Free MB",
3 round(SUM(A.SUMB)*100/SUM(A.TOTS)) "%FREE",
100-round(SUM(A.SUMB)*100/SUM(A.TOTS)) "%USED",
round(SUM(A.LARGEST)/1024/1024) MAX_FREE,SUM(A.CHUNKS) CHUNKS_FREE
4 5 6 FROM (
7 SELECT TABLESPACE_NAME,0 TOTS,SUM(BYTES) SUMB,
[code]...
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Apr 12, 2010
This morning i feel my db server very slow to response. When i check, i saw db server got high load but low process.
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Oct 16, 2010
My problem is only on Some Saturday's my Oracle server's Load average goes high (more than 300 ).
-- oracle version 11.2.0.1.0
-- runs on Sun solaris 10
-- Sun fire V 440
-- Sun storEdge 3315 connected to the server.
Same setup is working find with higher volumes without any problem but only on saturday's, that too not on all saturdays, some specific saturdays the load average goes high.
At the time nothing will be processed from the application side and the cpu utilisation goes high upto 95 %.
I am sending necessary information as follows.
vmstat 6 10
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr s0 s1 s3 s4 in sy cs us sy id
3 0 0 28660024 6513408 285 212 2044 2 2 0 0 0 17 0 42 830 3469 1380 22 5 74
125 0 0 29027480 6156256 2 6 34 0 0 0 0 0 5 0 10 791 53770 30278 83 17 0
125 0 0 29027680 6157496 29 140 21 1 1 0 0 0 5 0 9 786 52756 30309 83 17 0
116 0 0 29031600 6159896 24 125 0 0 0 0 0 7 3 0 5 819 54081 31069 83 17 0
[code]....
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Mar 28, 2013
How can I find out the particular oracle session which was consuming high memory in the past?
I can't get the data in v$sessstat
Unable to get the information in AWR
dba_hist_active_session_history do not have field which indicate memory related information
Shall I concetrate on EVENT in dba_hist_active_session_history which continuosly had sort, direct path read
Or
Locate sql_id from dba_hist_sqlstat with high SORTS_DELTA for snapshots belonging to problematic time period and then using the sql_id query dba_hist_active_session_history
which approach I shall take to find out the session which consumed most memory in the past?
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Jun 9, 2010
we have a software which keeps a check on v$session table so that a client can not have more than one sessions running simultaneously with the server. But if a client program terminates unexpectedl, it's session information stays in the v$session table, which prevents us from opening a new instance of the client program. Using
ALTER SYSTEM KILL SESSION 'SID, SERIAL#'
doesn't work since it takes ages to rollback and release the locks. And the session stays there with a 'KILLED' status.I want this session out of the v$session table and instantly.
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Jul 26, 2010
While creating the index we are getting the error "ORA-00603: ORACLE server session terminated by fatal error".
We have the space in tablespaces and also in the file systesm.
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Aug 23, 2011
My disk is completely full so i decided to drop temporary tablespace and create a new one but unfortunately the query to drop temp tablespace hang in between to whic I come to know that there were some sessions which were using it for sort purpose.
check out the queries below with results:
SQL> SELECT b.tablespace,b.segfile#,b.segblk#,b.blocks,a.sid,a.serial#,
2 a.username,a.osuser, a.status
3 FROM v$session a,v$sort_usage b
4 WHERE a.saddr = b.session_addr;
[code]....
Was able to killed three of the four sessions but not the last one.
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Jun 11, 2007
I would like to log session activities. I would also like to be able to check if the session for which an activity has been logged is still active. The problem is, what do I need to uniquely identify a session?
DBMS_SESSION.UNIQUE_SESSION_ID - is explained as: unique for all sessions currently connected to this database. Meaning that if I restart the DB or connections are closed and opened, it might not be unique anymore, right?
SYS_CONTEXT('userenv','sessionid') - returns AUDSID, but is this guarantied to be unique and not been reused, forever? What I do not want to happen is, that I use a session identifier, which might reappear.
My best guess is currently:
SYS_CONTEXT('userenv','sessionid') + logon_time (from V$SESSION)
This combination should be really unique and should never reappear, right?
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Apr 17, 2011
Can I extract data from our Oracle server regarding the no. of sessions per day? But the problem is that our Boss wants a previous dates from April 11-17, 2011.
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Mar 18, 2013
I need to ask about PGA memory. Is this memory for every user or every session
i.e. PGA 200M
I have 2 users with 300 connection with one of them. Is 200M for 300 connection or for every connect.
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May 22, 2012
One user complained that, his session is closing automatically when his session exceeds exactly 01 hour 1 minute.
default profile is assigned for this user. I checked the idle_time value of this default profile. it is UNLIMITED only. What else I need to check to find out is there any timeout parameter has been set or not?
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Feb 6, 2010
Which is the best way to kill a session?
alter system kill session sid,serail#
or
kill -9 spid
or
orakill sid,thread
I am using unix,windows operating system.
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Apr 23, 2013
How to kill of a killed session?
I had killed inactive session using alter system kill session 'sid,serial#';
after that that sessions marked as killed and still get in v$session.
Then i try to get spid so that i can killed then from os command kill -9 spid
but when i try to get that join with v$process, no row select.
select * from v$session where username ='CAS' and status ='KILLED'
return 205 records.
select p.*,s.username,s.program,s.machine,s.status from v$process p,v$session s
where p.addr=s.paddr and s.status='KILLED'
return no record.
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Nov 22, 2010
what does 'SNIPED' status in v$session mean? It is killed/ clear from instance automatically or need to kill manually for releasing the resource.
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Jun 8, 2010
I am using TOAD to monitor user sessions. I have a user who uses nearly 80% of Overall resources in the mornings. He calls me daily and say that his work is done. But even then the TOAD shows that he is using same resources for some time.
My question is can i kill the session once he confirms his work is done OR do i need to wait till the redologs are cleared.
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Aug 9, 2013
A way to show session parameters? Such as
CONSTRAINTS
USE_STORED_OUTLINES
ROW ARCHIVE VISIBILITY
CURRENT_SCHEMA
I can detect the CURRENT_SCHEMA with a query against the user env context, but I can't find any of the others there. Could there be an issue with these values being stored in PGA, and therefore not visible though any regular views? I did find an article that showed a query against an x$ data structure which showed something for different settings of CONSTRAINTS, but I can't find it again.
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Aug 5, 2011
when i modify a column of table tb_hxl_user,just as flowing:
Alter Table TB_HXL_USER Modify CREATE_DATE Not Null
now i select the table TB_HXL_USER,just as flowing:
select * from TB_HXL_USER;
it is hang,and i found the wait event is library cache lock in v$session_waits,why?how can i avoid this.
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Mar 23, 2010
How to Close All open cursors in other session.
NAME TYPE VALUE
------------------------------------ ----------- ---------------
cursor_sharing string EXACT
cursor_space_for_time boolean FALSE
open_cursors integer 500
session_cached_cursors integer 50
Ex. as above we have 500 max cursor
seesion show 499 and now we need to flust all open cursors
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May 24, 2013
One issue happens frequently in My database,Logwr process blocking other session,when i checked blocked session in v$session wait_class was commit and event was logfile sync,
EVENT# WAIT_CLASS
------ ----------------------------------------------------------------
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
115 Configuration
116 Commit
116 Commit
116 Commit
116 Commit
EVENT# WAIT_CLASS
------ ----------------------------------------------------------------
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
116 Commit
EVENT# WAIT_CLASS
------ ----------------------------------------------------------------
As per this we predicate Logbuffer Might be full so i just to reboot server,Note server was 32 Bit i can allocate only 1GB of SGA SYStem not allows me to increase SGA further. Server reboot is proper solution?
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Dec 27, 2011
How to find the sid from v$session of my current session.
I want to ask:
Let say I have open 10 TOAD session and only in one toad session i have fired a sql query ( the rest 9 session are just blank), then the rest 9 status are in active status. Now, how i can figure out which sid ( from v$session ) belongs to which session as all the 9 session having nothing to run.
Quote: My main intention is to find out the current session sid as soon as it make connection with DB.
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Jan 31, 2012
I have a question about spfile.
SQL> SELECT COUNT(*) FROM v$parameter WHERE value IS NOT NULL;
COUNT(*)
----------
246
SQL> SELECT COUNT(*) FROM v$spparameter WHERE value IS NOT NULL;
COUNT(*)
----------
20
v$parameter displays information about the initialization parameters that are currently in effect for the session,but v$spparameter displays information about the contents of the spfile.I want to know why the count of parameters whose values are not null in v$parameter is greater.where are they from? My initialization parameter file is spfile.
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May 20, 2010
How I can find the hostname for an oracle session id?
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Sep 14, 2012
SQL> startup mount
ORACLE instance started.
Total System Global Area 905969664 bytes
Fixed Size 1293720 bytes
Variable Size 520094312 bytes
Database Buffers 377487360 bytes
Redo Buffers 7094272 bytes
Database mounted.
SQL> alter database noarchivelog;
Database altered.
SQL> alter database open; alter database open
ERROR at line 1: ORA-00603: ORACLE server session terminated by fatal error
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