Discovrer Summery folder rebuilt error ORA-30353: expression not suppor

Hi
While i edit summery folder in discoverer 10g. I got follwing error.
ORA-30353: expression not supported for query rewrite
I checked this error with oracle but i m not ok with that. As per their solution disable the REWRITE option on the materialized view. But i already do that.
Plz help me on this..
Edited by: user3318200 on Nov 7, 2008 1:11 AM

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Urgent! Error: ORA-01034 Oracle not available for Oracle10gi

I have used SQL*Plus for a while, but recently when I try to login there is this error message:
Error:
ORA-01034 ORACLE not available
ORA-27101 shared memory realm does not exist
I had search for the solution quite a while. I changed the "sqlnet.ora" from C:\OraHome_1\NETWORK\ADMIN
I changed SQLNET.AUTHENTICATION_SERVICES=NT; to SQLNET.AUTHENTICATION_SERVICES=NONE and then reboot the machine.
The weird thing is that sometimes it works after I reboot the machine, but recently this just doesn't work any more. The SQL*Plus generates the same error message as I wrote above.
It seems like this kind of problem has troubled lots of oracle database users. IS this a bug that exists in the Oracle10gi?
Or does Oracle10gi require to run on certain operating system platform like Windows XP Professional but does not support for Windows XP Home Edition?
Can the Oracle company provide some error solution guide for the public for their own system?
many thanks

No this specific error message is not a result of an Oracle bug to my knowledge.
In my experience it is a simple matter of not using Oracle correctly. Only it is not that simple from a pure end-user perspective as Oracle is not a mickey mouse little filing system that pretends to be a database (like MS Access).
Which makes sense. After all, driving a bicycle does not mean one is able to get on a superbike. And if you respond "what!! why is it a superbike!?" then you need a bicycle in the first place.
The cause of the error you list - the client is making a local IPC dedicated server connection to the Oracle instance. This fails as the dedicated server cannot find the Oracle SGA (shared memory area) to attached to. This is usually the result of
a) the Oracle instance is down (and thus the SGA does not exist)
b) the ORACLE_SID used by the client is incorrect (and thus it attempts to attach to a non-existant SGA)
Reason (a) could be caused by some underlaying issue that results in the Oracle instance shutting down automatically or unintentionally.
As for what Oracle 10G requires operating system wise. There are detailed platform certification matrixes on the Oracle web site. In addition, the INSTALLATION notes of Oracle also specifies what platforms are supported.
You also fail to mention the exact Oracle product you're running. Oracle XE is different than Oracle Standard Edition which is different than Oracle Enterprise Edition.
There is btw a dedicated support forum here for Oracle XE - and this one ain't it.

Error: ORA-00439: feature not enabled: Managed Standby

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DBCA error ORA-01034 oracle not available on Windows server 2008 r2 64

Hi All,
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ERROR ORA-01034 : ORACLE not available

HELLO FRIENDS,
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4joey1 wrote:
However,when I try to log into OEM and isqlplus,the error message below appears
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Two basic reasons for the failure.
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ORA-01034: ORACLE not available Linux Error: 2: No such file or directory

Hi,
I have oracle 10.2.0 on Redhat 4 Linux. Yesterday i transport my database from windows to linux and it was working fine.
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[oracle@satish bin]$ ./sqlplus sys as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Tue May 19 15:33:22 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Enter password:
ERROR:
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Enter user-name: system
Enter password:
ERROR:
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ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
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but can't find out what.
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Thanks for reply
I applied all the thing
1. my user is already in dba group.
2. I change the permission on orapwORCL and i recreate the same file.
3. [oracle@satish bin]$ ./sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Tue May 19 16:06:25 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR:
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any other suggestions.

ORA-01007 - variable not in select list error in pl\sql code

Hi,
When I tried to run this program I am getting below error:
ORA-01007 - variable not in select list.Please help to resolve.
Code:
create or replace procedure "XX_BPM_DATA_P" (P_PROCESS_ID IN VARCHAR2)
is
TYPE l_entity_type IS TABLE OF xx_BPM_data.ENTITY%TYPE INDEX BY PLS_INTEGER;
TYPE l_data_type IS TABLE OF XX_BPM_DATA.DATA%TYPE INDEX BY PLS_INTEGER;
TYPE l_count_type IS TABLE OF XX_BPM_DATA.count%TYPE INDEX BY PLS_INTEGER;
l_Entity_v l_Entity_type;
l_data_v l_data_type;
l_count_v l_count_type;
l_security_group_id number;
app_id number(20);
l_Actual_value XX_BPM_DATA.DATA%TYPE;
cursor BPM_CUR is select id,process_id , sequence, to_char(query) query,report_num from xx_test_bpm_dynamic
where
    process_id = p_process_id
       and report_num=1
order by process_id, sequence;
BEGIN
--delete xx_bpm_data where process_id = p_process_id;
for bpm_rec in bpm_cur
loop
delete xx_bpm_data
where process_id = bpm_rec.process_id
and sequence = bpm_rec.sequence
and report_num = bpm_rec.report_num;
l_security_group_id := apex_custom_auth.get_session_id_from_cookie;
--dbms_output.put_line(l_security_group_id);
execute immediate bpm_rec.query BULK COLLECT INTO l_ENTITY_v,l_DATA_v,l_count_v;
if (bpm_rec.report_num=2) then
app_id:= 108;--NV('APP_ID');
FORALL i IN l_ENTITY_v.FIRST..L_ENTITY_V.LAST
INSERT INTO XX_BPM_DATA
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value,data,count,
Process_ID,
Sequence,report_num)
VALUES(l_entity_v(i),
l_data_v(i),
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BPM_rec.sequence,
bpm_rec.report_num);
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FORALL i IN l_ENTITY_v.FIRST..L_ENTITY_V.LAST
INSERT INTO XX_BPM_DATA(EnTITY,data,
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Process_ID,
Sequence,report_num)
VALUES(l_entity_v(i),
l_data_v(i),
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BPM_rec.sequence,
bpm_rec.report_num);
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select round(avg(value),2) into l_actual_value from xx_bpm_data where process_id=bpm_rec.process_id and sequence=bpm_rec.sequence and report_num=bpm_rec.report_num;
update xx_test_bpm_dynamic set value=l_actual_value where process_id=bpm_rec.process_id and sequence=Bpm_rec.sequence and report_num= bpm_rec.report_num;
end loop;
Commit;
END;

When I tried to run this program I am getting below error:
ORA-01007 - variable not in select list.Please help to resolve.
You likely would not need any help in you wrote and tested your code using standard best practices.
Your code has NO exception handler and you are NOT identifying each step in the code so that the exception handler could print/log a message telling you EXACTLY which step raised the exception.,
v_step NUMBER;
-- before step 1
v_step := 1;
-- before step 2
v_step := 2;
Then in the exception handler the value of 'v_step' will tell you which step raised the exception.
The exception you posted refers to a 'select list' so examine ALL of the select lists in your code. If you do that you will see that the primary query being run is obtained from a database table and then executed using dynamic SQL
execute immediate bpm_rec.query BULK COLLECT INTO l_ENTITY_v,l_DATA_v,l_count_v;
We have no way of knowing what query is in 'bpm_rec.query' when the exception happens or what columns that query returns. For all we know the query returns 2 columns and you are trying to load 3 collections. Or maybe the query returns 8 columns and you are trying to load 3 collections.
Why don't you print out the query and execute it manually so you can see exactly what the result set looks like?
dbms_output.put_line(bpm_rec.query);
And don't even get us started on why you are using such security-prone dynamic sql to perform this processing instead of using ordinary SQL statements. Or why you are using associative arrays for the BULK COLLECT instead of nested tables.
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Errors - ORA-01034, ORA-27101 & Linux-x86_64 Error: 2: No such file or dir

I have installed Oracle 10g database and AS 10g on SUSE linux EE 10 (SP2)
When I try to log in as system/system using sqlplus locally on the server, it works fine. However, when I try the following I get error messages:
SQL> conn system/system@botsdb
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
I tried the same from my laptop through sqlplus and the error message is the same.
I checked if the database was up and to check this I executed follwing commands whicle still being logged as system/system:
SQL>Select * from v$database;
SQL>Select * from v$instance;
SQL>Select * from tab;
These do bring results. Also if I try to start up the database again, it gives error message that the database is already up. I have restarted the db number of times, checked if my listener was listening on the service BOTSDB and these all seem fine.
It is very intriguing that when @BOTSDB is attached while connecting, the connection fails.
Can someone please guide me to sort this error?
Thanks and kind regards,
Aparna

Hi
I am answering all the three questions here.
1) No of instances on the machine, I understand it is 1.
2) Results of lsnrctl status
oracle@linuxserver:~> lsnrctl status
LSNRCTL for Linux: Version 10.1.0.4.2 - Production on 28-JUL-2010 09:19:33
Copyright (c) 1991, 2004, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=linuxserv.dcdm.mu)(PORT=1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 10.1.0.4.2 - Production
Start Date 27-JUL-2010 11:24:12
Uptime 0 days 21 hr. 55 min. 20 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /oracle/app/ora10ginfra/network/admin/listener.ora
Listener Log File /oracle/app/ora10ginfra/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=linuxserver.dcdm.mu)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "metarep.dcdm.mu" has 1 instance(s).
Instance "metarep", status READY, has 3 handler(s) for this service...
The command completed successfully
--Note that lsnrctl status command was issued after loading 10ginfra.env file.
Please note that the listener for the database is set as DBLISTENER and lsnrctl status DBLISTENER was executed after loading 10gdb.env file. The results of lsnrctl status DBLISTENER are as follows:
oracle@linuxserver:~> . ./10gdb.env
oracle@linuxserver:~> lsnrctl status DBLISTENER
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 28-JUL-2010 09:24:44
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.107.123)(PORT=1650)))
STATUS of the LISTENER
Alias DBLISTENER
Version TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date 27-JUL-2010 15:11:28
Uptime 0 days 18 hr. 13 min. 15 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /oracle/app/ora10gdb/network/admin/listener.ora
Listener Log File /oracle/app/ora10gdb/network/log/dblistener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.107.123)(PORT=1650)))
Services Summary...
Service "BOTSDB" has 1 instance(s).
Instance "BOTSDB", status UNKNOWN, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
3) The output of ps -ef |grep pmon is
oracle@linuxserver:~> ps -ef |grep pmon
oracle 12524 12091 0 09:16 pts/1 00:00:00 grep pmon
oracle 12525 1 0 Jul27 ? 00:00:00 ora_pmon_metarep
oracle 25776 1 0 Jul27 ? 00:00:00 ora_pmon_BOTSDB
The contents of listener.ora in two different Oracle Homes (one for AS infrastrcuture and another one for database) are as follows:
oracle@linuxserver:/oracle/app/ora10ginfra/network/admin> vi listener.ora
# listener.ora Network Configuration File: /oracle/app/ora10ginfra/network/admin/listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /oracle/app/ora10ginfra)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = linuxserv.dcdm.mu)(PORT = 1521))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
oracle@linuxserver:/oracle/app/ora10gdb/network/admin> vi listener.ora
# Generated by Oracle configuration tools.
SID_LIST_DBLISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /oracle/app/ora10gdb/)
(PROGRAM = extproc)
(SID_DESC =
(SID_NAME = BOTSDB)
(ORACLE_HOME = /oracle/app/ora10gdb/)
DBLISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.107.123)(PORT = 1650))
Kind regards,
Aparna

SDO_INTERSECTION error: ORA-21779

Hi.
I have encountered a problem with sdo_intersection in Oracle 9.2 that somebody may be able to help me with:
I am trying to intersect two polygons (one is a rectangle that I have created by specifying co-ordinates, the other is a selection from a larger table of polygons). If I specify a tolerance of 0.005 for this function then the relationship between the two is determined to be 'TOUCH', which is incorrect, and the result is a line. If I specify a smaller tolerance (eg 0.0005), then the relationship is determined to be 'OVERLAPBYINTERSECT' but the intersection function results in the error: ORA-21779: duration not active.
Below is an extract from my work - the last line is the one where the error occurs:
overlap_region := MDSYS.SDO_GEOMETRY(2003, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1, 1003, 1), MDSYS.SDO_ORDINATE_ARRAY(min_x_wc, min_y_wc, max_x_sw, min_y_wc, max_x_sw, max_y_sw, min_x_wc, max_y_sw, min_x_wc, min_y_wc));
Select GEOLOC into big_wc from base_list_local where name = 'Southwest';
temp := mdsys.sdo_geom.relate(big_wc, 'DETERMINE', overlap_region, 0.000005);
dbms_output.put_line(temp);
small_wc := MDSYS.SDO_GEOM.SDO_INTERSECTION(overlap_region, big_wc, 0.000005);

Version 9.2.0.1.0
If this is a bug then does anybody have an idea for a work-around (ie. another way to acheive an intersection, without using the sdo_intersection function)?

ORA-01034: ORACLE not available ORA-27101: shared mem Linux-x86_64 Error 2

Hello,
I was in the process of importing a table and my VM Rhel 6 Oracle machine hung. I rebooted the machine and Im getting the following issues.
SQL*Plus: Release 11.2.0.1.0 Production on Wed May 9 12:51:47 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter user-name: example
Enter password:
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
Process ID: 0
Session ID: 0 Serial number: 0
I am a bit concerned over the Linux-x86_64 Error 2 issue. Can someone assist here please.
Thanks Kevin Decker

Request per the 1st earlier post.
id=601(oracle) gid=517(oinstall) groups=517(oinstall),518(dba)
-bash-3.2$ env | sort
_=/bin/env
CLASSPATH=/usr/app/oracle/product/11.2.0/jlib:/usr/app/oracle/product/11.2.0/rdb ms/jlib
G_BROKEN_FILENAMES=1
HISTSIZE=1000
HOME=/usr/app/oracle
HOSTNAME=LPLCLDDB105.lab.trcn.aexp.com
INPUTRC=/etc/inputrc
LANG=en_US.UTF-8
LD_LIBRARY_PATH=/usr/app/oracle/product/11.2.0/lib:/lib:/usr/lib
LESSOPEN=|/usr/bin/lesspipe.sh %s
LOGNAME=oracle
LS_COLORS=no=00:fi=00:di=00;34:ln=00;36:pi=40;33:so=00;35:bd=40;33;01:cd=40;33;0 1:or=01;05;37;41:mi=01;05;37;41:ex=00;32:*.cmd=00;32:*.exe=00;32:*.com=00;32:*.b tm=00;32:*.bat=00;32:*.sh=00;32:*.csh=00;32:*.tar=00;31:*.tgz=00;31:*.arj=00;31: *.taz=00;31:*.lzh=00;31:*.zip=00;31:*.z=00;31:*.Z=00;31:*.gz=00;31:*.bz2=00;31:* .bz=00;31:*.tz=00;31:*.rpm=00;31:*.cpio=00;31:*.jpg=00;35:*.gif=00;35:*.bmp=00;3 5:*.xbm=00;35:*.xpm=00;35:*.png=00;35:*.tif=00;35:
MAIL=/var/spool/mail/oracle
ORACLE_BASE=/usr/app/oracle
ORACLE_HOME=/usr/app/oracle/product/11.2.0
ORACLE_HOSTNAME=LPLCLDDB105.phx.aexp.com
ORACLE_SID=DOC105P
ORACLE_UNQNAME=DOC105P
PATH=/usr/app/oracle/product/11.2.0/bin:/sbin:/usr/sbin:/bin:/usr/bin
PWD=/usr/app/oracle
SHELL=/bin/bash
SHLVL=1
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
SSH_CLIENT=10.68.13.164 49281 22
SSH_CONNECTION=10.68.13.164 49281 10.68.58.50 22
SSH_TTY=/dev/pts/0
TERM=xterm
TMPDIR=/tmp
TMP=/tmp
USER=oracle
Refer to the SQL*Plus User's Guide and Reference for more information.
-bash-3.2$ sqlplus '/as sysdba'
SQL*Plus: Release 11.2.0.1.0 Production on Wed May 9 14:33:45 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
SQL> startup
ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance
ORACLE instance started.
Total System Global Area 534462464 bytes
Fixed Size 2215064 bytes
Variable Size 331350888 bytes
Database Buffers 192937984 bytes
Redo Buffers 7958528 bytes
Database mounted.
ORA-03113: end-of-file on communication channel
Process ID: 20688
Session ID: 9 Serial number: 3

Error ORA-12162 with sqlplus

Hi everybody,
When I open sqlplus64, I take the user-name ans password and I have the error message
ERROR:
ORA-12162: TNS:net service name is incorrectly specified
But while processing the user-name and password are the same I made ...
I don't understand.
Best regards,
Transact
Edited by: transact on 4 déc. 2010 13:36

=================================
A couple of important points.
First, the listener is a server side only process. It's entire purpose in life is to receive requests for connections to databases and set up those connections. Once the connection is established, the listener is out of the picture. It creates the connection. It doesn't sustain the connection. One listener, with the default name of LISTENER, running from one oracle home, listening on a single port, will serve multiple database instances of multiple versions running from multiple homes. It is an unnecessary complexity to try to have multiple listeners or to name the listener as if it belongs to a particular database. That would be like the telephone company building a separate switchboard for each customer.
Additional notes on the listener: One listener is capable of listening on multiple ports. But please notice that it is the listener using these ports, not the database instance. You can't bind a specific listener port to a specific db instance. Similarly, one listener is capable of listnening on multiple IP addresses (in the case of a server with multiple NICs) But just like the port, you can't bind a specific ip address to a specific db instance.
Second, the tnsnames.ora file is a client side issue. It's purpose is for address resolution - the tns equivalent of the 'hosts' file further down the network stack. The only reason it exists on a host machine is because that machine can also run client processes.
Assume you have the following in your tnsnames.ora:
larry =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = myhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVICE_NAME = curley)
)Now, when you issue a connect, say like this:
$> sqlplus scott/tiger@larrytns will look in your tnsnames.ora for an entry called 'larry'. Next, tns sends a request to (PORT = 1521) on (HOST = myhost) using (PROTOCOL = TCP), asking for a connection to (SERVICE_NAME = curley).
Where is (HOST = myhost) on the network? When the request gets passed from tns to the next layer in the network stack, the name 'myhost' will get resolved to an IP address, either via a local 'hosts' file, via DNS, or possibly other less used mechanisms. You can also hard-code the ip address (HOST = 123.456.789.101) in the tnsnames.ora.
Next, the request arrives at port 1521 on myhost. Hopefully, there is a listener on myhost configured to listen on port 1521, and that listener knows about SERVICE_NAME = curley. If so, you'll be connected.
What can go wrong?
First, there may not be an entry for 'larry' in your tnsnames. In that case you get "ORA-12154: TNS:could not resolve the connect identifier specified" No need to go looking for a problem on the host, with the listener, etc. If you can't place a telephone call because you don't know the number (can't find your telephone directory (tnsnames.ora) or can't find the party you are looking for listed in it (no entry for larry)) you don't look for problems at the telephone switchboard.
Maybe the entry for larry was found, but myhost couldn't be resolved to an IP address (say there was no entry for myhost in the local hosts file). This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe there was an entry for myserver in the local hosts file, but it specified a bad IP address. This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe the IP was good, but there is no listener running: "ORA-12541: TNS:no listener"
Maybe the IP was good, there is a listener at myhost, but it is listening on a different port. "ORA-12560: TNS:protocol adapter error"
Maybe the IP was good, there is a listener at myhost, it is listening on the specified port, but doesn't know about SERVICE_NAME = curley. "ORA-12514: TNS:listener does not currently know of service requested in connect descriptor"
Third: If the client is on the same machine as the db instance, it is possible to connect without referencing tnsnames and without going through the listener.
Now, when you issue a connect, say like this:
$> sqlplus scott/tigertns will attempt to establish an IPC connection to the db instance. How does it know the name of the instance? It uses the current value of the enviornment variable ORACLE_SID. So...
$> export ORACLE_SID=fred
$> sqlplus scott/tigerIt will attempt to connect to the instance known as "fred". If there is no such instance, it will, of course, fail. Also, if there is no value set for ORACLE_SID, the connect will fail.
check executing instances to get the SID
[oracle@vmlnx01 ~]$ ps -ef|grep pmon|grep -v grep
oracle    4236     1 0 10:30 ?        00:00:00 ora_pmon_vlnxora1set ORACLE_SID appropriately, and connect
[oracle@vmlnx01 ~]$ export ORACLE_SID='vlnxora1
[oracle@vmlnx01 ~]$ sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:37 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsNow set ORACLE_SID to a bogus value, and try to connect
SQL> exit
[oracle@vmlnx01 ~]$ export ORACLE_SID=FUBAR
[oracle@vmlnx01 ~]$ sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:57 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
Enter user-name: Now set ORACLE_SID to null, and try to connect
[oracle@vmlnx01 ~]$ export ORACLE_SID=
[oracle@vmlnx01 ~]$ sqlplus /scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:43:24 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-12162: TNS:net service name is incorrectly specifiedOk, that is how we get from the client connection request to the listener. What about the listener's part of all this?
The listener is very simple. It's job is to listen for connection requests and make the connection (server process) between the client and the database instance. Once that connection is made, the listener is out of the picture. If you were to kill the listener, all existing connections would continue. The listener is configured with the listener.ora file, but if that file doesn't exist, the listener is quite capable of starting up with all default values. One common mistake with the listner configuration is to specify "HOST=localhost" or "HOST=127.0.01". This is a NONROUTABLE ip address. LOCALHOST and ip address 127.0.0.1 always mean "this machine on which I am sitting". So, all computers are known as "localhost" or "127.0.0.1". If you specify this address, the listener will only be capable of receiving requests from the machine on which it is running. If you specified that address in your tnsnames file - on a remote client machine - the request would be routed to the machine on which the requesting client resides. Probably not what you want.
=====================================

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