Server Administration :: Number Of Sessions In Database MES (production) Coming From Another Machine
May 25, 2010
We have quite a number of sessions in database MES (production) coming from another machine.
From v$session, the program is oracle@WID27 (TNS V1-V3). This WID27 (hostname) consists of quite a number of development databases inside. We have to trace which jobs are actually triggering this, as WID27 are not suppose to connect to production databases.
How can we tell whether the sessions came in is from dblink or from the machine itself?
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Mar 26, 2013
I have a simple question about database sessions. The value of parameter "sessions" is set to 500 and the users connect to database through an application server(Jboss). There are more than 500 users connect to the database through application.
My question is, how more than 500 users can connect to the database without any issue, if we set the value of "sessions" parameter to 500?
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May 3, 2011
I need to import data to production database. The database details are not in tnsnames.ora.
I am using easy connect method to connect to the database, since I am not able to edit tnsnames.ora.
Is there any way by which I can do the import ?
Can I do it like this
imp system/pwd@imp system/pwd@'(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=xxx)(PORT=1521)))(C
ONNECT_DATA=(SID=xx))' ......................
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Apr 30, 2012
database administration , we are planning to use amazon cloud database , this database does not allow us to login to server machine , unfortunately amazon don't provide ssh to this machine , in general for doing any of adminstration task on the database will there be need to log into the machine ? we can always log in through toad or any other sql client but we cannot do ssh to server..general can this limitation effect administration ?
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Dec 7, 2010
I am trying to upload a database backup on a machine. Since the structure of files is different from server, how can i start the database.
Do i need to create a new control file? If yes, how can i run the sql command "Alter database backup controlfile to trace" in nomount mode.
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Sep 10, 2012
I need to trace all sessions created from specific user and specific machine . Got some code from internet and customised .
CREATE OR REPLACE TRIGGER SYS.enable_trace_trigger
AFTER LOGON ON DATABASE
DECLARE
[Code]....
I have yet not created it on db .
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Mar 16, 2011
can we have multiple database version running in a single machine with multiple instances provided there are enough resources.Can we do in RAC only?
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Mar 9, 2012
My application is opening a lot of sessions in my DB server. I applied resource_limit=true and idle_time=15 min. ans assign this profile to all application user.
Now I am seeing a lot of sessions having status sniped in v$session.
I want to clean up these sniped sessions and what they mean.
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Aug 19, 2010
I am using oracle 10g as server in my lab. I faced some problems initially, but later after increasing the USERS tablespace it is working fine.
But there is still one problem. During the query execution some queries will be blocked and it doesn't leave any consequent queries to execute from the same user.
The blocked sessions will be displayed in the admin page under blocking sessions link. There is a option to kill the session. But when i do that, it affects all the users and the connection will be lost to all the users. again I have startup the database from beginning.
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Jul 13, 2010
We had an issue last week were we had a session with a very basic SQL query lock up the database, spiking the CPU at 100%. When you would kill the session, the lock would just jump to another session and so on. We finally had to restart the database since our clients were being kicked out. After the restart of the database, the LGWR ended up locking and held the CPU between 85-95%. The archive logs were switching every 5 minutes, when normally it would be every 45min. We spoke with Oracle Support, but they just ended up brushing the issue off and saying it was a hardware issue and were not able to provide any kind of backing to that.
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Jan 26, 2010
I am working on ASM as i am bit confused to decide ASM Disk strategies in production Environments. For Ex:-
1.Normal Redundancy ( Allows 2 Mirror Groups ) :-
I have created Normal_DG Diskgroup with 4 Disks
Disk1-------------------
Disk2 ------- |
|--->FG2 ----> FG1
Disk3 ------- |
Disk4-------------------
According to my understanding , if Disk1 Fails Disk4 facilitates normal operations. When there is space crunch it operates in reduced redundancy . Am i right ?
2.I have got 4 Disks in one group (i.e from Disk1 To Disk4 ) i have not defined any failure group and as per my understanding all disks will be added to its own failure group without mirroring and striping.
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Feb 5, 2011
I have a table with counter value which will be incremented or decremented by several application servers.
SQL> select * from test;
COUNTER
----------
10
Application servers(multiple servers) will be running update against this row for increasing the counter value or decreasing the counter value.
update test set counter=counter+1;
update test set counter=counter-1;
update test set counter=counter+1;
update test set counter=counter+1;
So when update happens concurrently to this table will the counter value gets messed up?
I did a small test by opening multiple sessions for running update and the result I got for above update statement was 11,10,11,12.
But our developer is bit skeptical about this approach and he is using select for update and then updating the row.
Which approach will be better?
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Mar 30, 2011
I'm sure you are all familiar with proxy users, they've been around since 9i: orcl> create user low identified by low;
User created.
orcl> create user high identified by high;
User created.
orcl> grant dba to high;
Grant succeeded.
orcl> alter user high grant connect through low;
User altered.
orcl> connect low[high]/low
Connected.
orcl> sho user
USER is "HIGH"
orcl>
Is there any way that I can find out which of the current sessions was proxied, and through what user? I know that from within the session I can query my userenv context and find out, but I can't see how to do it otherwise. It must be possible: the audit trail records both the real user and the proxy user.
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Oct 27, 2010
I killed some 70 sessions which where inactive couple of days ago using alter system kill session(sid,serial#) immediate;
But even after killing them it still exists in the v$session view when I query select sid,serial# from v$session where username is not null; It has the same sid and serial#....I tried killing them every now and then but it still shows those exists
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Oct 31, 2012
Steps to Refresh test Oracle 9i schema from production schema on a Windows platform..
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Jun 6, 2012
I want to OFF tablspace AUTOEXTEND on a prodution system, we have many RAC databses and that will be done on all stations. i have got a document from net which was written on 29-Jun-2007 and it says that if need to OFF the AUTOEXTEND of a TABLESPACE so you need to ist make it off on the underlying datafiles of that tablespace so this doc is for Oracle 8.1.7.2.0
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Oct 13, 2012
I will have to proceed with Oracle 9 database refresh from production server to integration server. 5 biggest schemas must be exported and imported. They constitute 97% space used in a database. This is very big database so I would like to be sure that everything will go smoothly. That is why i want to ask you some questions.
Have you got any clues for me before I start with exp/imp? From my side i will tell you that I will have to exp/imp schema by schema because there is small space both on production and integration disk for a dump. First thing I thought are dependencies between schemas that are exported and that which are not, and also between schemas that are exported/imported one by one.
This is procedure that I plan:
For every schema that is to be refreshed
{
1. Export schema with ROWS=N CONSTRAINTS=Y
2. EXPORT schema with ROWS=y CONSTRAINTS=N
3. Import schema from step one
4. Disable all the foreign key constraints using ALTER TABLE DISABLE CONSTRAINT.
5. Import schema with rows
}
ALTER TABLE ENABLE CONSTRAINT
With above procedure i think that I will avoid problems with dependencies between schemas exported/imported one by one. But my concern is if there are any dependencies between those schemas and schemas that are not exported. Is there an way to check it before refresh ?
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Aug 1, 2011
when we ran SELECT statement against CUBE, we got below wait event: resmgr: cpu quantum.Further, we checked below 2 parameters :
NAME VALUE
------------------------- --------------------------------------------------
resource_limit TRUE
resource_manager_plan SCHEDULER[0x12B943C]:DEFAULT_MAINTENANCE_PLAN
[code]....
It has been found that these sessions did not get enough CPU to process the request. how to find out how many CPU has been allocated to this database ?
> uname -a
Linux dukedmts03db02.corp.cox.com 2.6.18-128.1.16.0.1.el5 #1 SMP Tue Jun 30 16:48:30 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
how to analyze how much % of CPU being utilized for a specific session ?
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Apr 27, 2013
Oracle 11g default server process is dedicated select distinct server from v$session; dedicated
Which server process is used in the oracle 11g Production? if the database is connect to an online application?
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Aug 12, 2013
column with datatype Number contains length 1.Its not null.Tried to trim then also length is 1 ....How to find what is the character there..?
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Sep 21, 2010
I have installed oracle 11g Release 11.1.0.1 on windows server 2008.I access this server from a client machine running on winXP through SQL PLUS. I wanted to shutdown and start DB server from this client machine. Accordingly i issued shutdown immediate command from SQLPLUS.
Now when i tried to start the DB with "STARTUP NOMOUNT" command i received error 12514. I understand this error means that the listener received a request to establish connections to a database but since DB services are not up and running, hence the error. So my first question is how do I resolve this error.
Continuing further, i tried to re-connect to the database as sys, and i received another error ORA-01041. So, my second question is why did i receive this error and again how can i resolve it
may be you can point me to relevant reference in Oracle documentation) how can i start and stop oracle from a client machine using SQL interface in CLI mode and windows environment and avoid this error.
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Dec 3, 2010
We are planning to consolidate our Oracle Production DB into one server. We are basically a windows shop. Is it feasible to run 8 production Oracle DB in one windows server. All the DB are not really transaction intensive DB. 2 DB in the size of 300GB and others all DB falls under average size of 40GB.
I can take care of the HD slicing so Oracle does not enter into IO bottleneck. We are planning to go for external NAS or SAN for storage.
My main concern is on processor usage. The processor we are thinking about is Intel Xeon Quad Core x 2nos. Will there be a processor bottleneck or is there way in Oracle to assign processor usage(I belive there is no much tweaking options here)
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Sep 13, 2011
I need to use Data Pump for the first time on my production Database.Currently on Testing Database, when i am taking schema level export there are no errors or warnings in the log file but when i importing it gives fallowing ORA in the import log file. i searched on google,the only way i found is to recompile the invalid objects. how to avoid this warnings in log file.
"ORA-39082: Object type ALTER_PROCEDURE:"QUANTISV4"."P_CTM_ABN_INVST_EQUITY" created with compilation warnings"
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Apr 26, 2012
I have already installed oracle 10g version in my Desktop. Now i want to install APPLICATION SERVER 10g version.
Should I Un install the Normal Database.
Or else can I have both in a single machine.
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Jul 19, 2012
Send me the procedure for cloning a database on the same machine / server .
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Oct 20, 2011
I have a RAC on 9i and I want to know the number of active sessions that it's executing the same sql sentence.I'm using this sql but I'm not sure that this query give me te correct result.
SELECT se.inst_id,se.status,se.SQL_HASH_VALUE,se.USERNAME,substr(sq.SQL_TEXT,1,50) SQL,count(*)
FROM GV$SESSION se, gv$sql sq
WHERE se.STATUS='ACTIVE'
and se.username is not null
[code]...
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Mar 26, 2013
I have client and database on same machine, when I will connect to the instance , it will use IPC, suppose If I will use connection string then which process will handle this request?
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Feb 2, 2012
I have a forms that generate a file from database into database server and copy it to client machine by the follow process:
IF webutil_file_transfer.Is_AS_readable(V_server_way || V_file_name) THEN
l_success := webutil_file_transfer.AS_to_Client
(clientFile => :V_screen_way
[code]...
But is showing the erro ora-105100 in one client machine
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Jun 4, 2013
We have standalone database running on ASM. Its 11Gr2 linux version5 server. After the Database bounce, the DB isnt coming up and is showing the below error.
SQL> startup nomount
ORA-01078: failure in processing system parameters
ORA-01565: error in identifying file '+DATA/test/spfiletest.ora'
ORA-17503: ksfdopn:2 Failed to open file +DATA/test/spfiletest.ora
ORA-15056: additional error message
ORA-17503: ksfdopn:2 Failed to open file +DATA/test/spfiletest.ora
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-00450: background process 'ASMB' did not start
ORA-00443: background process "ASMB" did not start
ORA-06512: at line 4
Also i checked the ASM disk groups. I can see all those are MOUNTED properly. In fact i could also see the spfile present in ASM disk physically. It looks like it couldn't identify the spfile to start up the db. however i could see it physically present in ASM disk group.
Find below snapshot.
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED EXTERN N 512 4096 1048576 358400 329103 0 329103 0 N DATA/
MOUNTED EXTERN N 512 4096 4194304 358368 358288 0 358288 0 N FRA/
MOUNTED EXTERN N 512 4096 4194304 20480 18780 0 18780 0 N REDO/
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Sep 2, 2012
i install oracle 10g on linux on perform the following step but my database is not auto start with the machine
Automatic startup and shutdown oracle on linux Oracle database server provides two scripts to configure automatic database startup and shutdown process.
The scripts are,
$ORACLE_HOME/bin/dbstart
$ORACLE_HOME/bin/dbshut
Now let's look at unix level script. When a unix machine boots it runs scripts beginning with Snnname in /etc/rc3.d.
-Here the number nn indicates the order in which these scripts will be run. The name just indicates the function of the script.
In the same way shutdown scripts are named as Knnname which are run from /etc/rc0.d.
If we want that Oracle is the last program that is automatically started, and it is the first to be shutdown then we will name the startup and shutdown scripts on OS like /etc/rc3.d/S99oracle and /etc/rc0.d/K01oracle respectively.
The database script dbstart and dbora will be called from OS script /etc/rc3.d/S99oracle and /etc/rc0.d/K01oracle respectively.
Note that dbstart and dbshut take each SID, in turn, from the /etc/oratab file and startup or shutdown the database.
Automate Startup/Shutdown of Oracle Database on Linux
Step 01: Be sure that oratab file is correct and complete.
Check for oratab file either in /etc/oratab or in /var/opt/oracle/oratab.
Database entries in the oratab file have the following format:
$ORACLE_SID:$ORACLE_HOME:Y
Here Y indicates that the database can be started up and shutdown using dbstart/dbshut script.
If in my database there is two database named arju and arjudup then my oratab file will contain the entry like,
arju:/var/opt/oracle/product/10.2.0/db_1:Y
arjudup:/var/opt/oracle/product/10.2.0/db_1:Y
where /var/opt/oracle/product/10.2.0/db_1 is the $ORACLE_HOME of my database.
Step 02: Create a script to call dbstart and dbshut. In this example I will create one script that will do both startup and shutdown operation. I will name this script as dbora and will be placed in '/etc/init.d'.
a) Login as root.
b) Change directories to /etc/init.d
c) Create a file called dbora and chmod it to 750.
# touch dbora
# chmod 750 dbora
d)Edit the dbora file and make the contents of it like below.
[Code].....
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