SQL*NET V2 최적화하기
제품 : SQL*NET
작성날짜 : 2001-04-25
SQL*NET V2 최적화하기
====================
1) PING
TCP/IP 네트워크상에서 ping을 사용해서
client와 server간에 걸리는 시간을 check할 수 있다.
만일 이 시간이 오래 걸리면 SQL*Net 보다 이 문제를 먼저 해결해야 한다.
사용 방법 :
ping 호스트이름
(NT의 경우에는 dos command상태에서)
2) TNSPING
이 tool은 기본적으로 설치가 되어 있으며
이 tool을 가지고 user가 client에 setting한 TNS alias(tnsnames.ora
파일안에 설정)
가 정상적으로 동작하는지를 테스트해 볼 수 있습니다.
TNSPING은 접속하고자하는 database가 있는 machine의 listener에 접속을하고
걸리는 시간을 miliseconds로 표시해 줍니다.
(실제 db와 connection을 맺는 것은 아닙니다.)
사용 방법 :
tnsping TNSalias이름
(NT의 경우에는 dos command상태에서)
3) 모든 logging 과 tracing 막기
Tracing은 client와 server에 모두 가능하게 할 수 있습니다.
다음 parameter를 SQLNET.ORA파일과 LISTENER.ORA파일
( $ORACLE_HOME/network(또는 net80)/admin에 위치합니다 )
에 setting하고 listener를 restart
(lsnrctl stop, lsnrctl start)
하면 SQL*Net의 모든 tracing을 막을 수 있습니다.
SQLNET.ORA:
TRACE_LEVEL_CLIENT =OFF
TRACE_LEVEL_SERVER =OFF
TNSPING.TRACE_LEVEL=OFF
'OFF'대신에 '0'을 사용해도 됩니다.
LISTENER.ORA:
TRACE_LEVEL_LISTENER=OFF
LOGGING_LISTENER=OFF
4) Listener log 파일들 지우기
만일 listener의 logging이 설정되어 있는 상태라면 LISTENER.LOG 파일이
이 생깁니다. listener는 connection이 맺어질대 마다 이 파일에
lock을 걸고 write하기 때문에 size가 계속 증가하게 되어 문제가 생길 수
있습니다. 만일 LISTENER.LOG 파일의 size가 너무 크게 되면 rename을 하시기
바랍니다. 그리고 listener를 restart하면 새로운 log file이 만들어 집니다.
5) SQLNET.ORA에 AUTOMATIC_IPC를 OFF로 설정
AUTOMATIC_IPC = { ON | OFF }
위 parameter는 "SQLNET.ORA"파일에 설정할 수 있으며 ON으로 되어 있는경우
SQL*Net이 같은 alias정보를 가진 local database가 있는지 check하게
됩니다.
만일 local database가 있다면 connection은 network layer를 건너뛰고 local
'Inter Process Communication'(IPC) connection을 맺게 됩니다.
따라서 이 setting은 database server쪽에 사용할 수 있는 것이지
client machine SQL*Net에는 아무 쓸모 없습니다.
database server쪽에 사용하더라도 local database에 SQL*Net connection이
반드시 필요한 경우가 아니라면 사용하시 않는 것(OFF로 설정)이 좋습니다.
6) SQLNET.ORA에 NAMES.DIRECTORY_PATH 설정
NAMES.DIRECTORY_PATH = (ONAMES,TNSNAMES)
이 parameter는 TNS aliases를 찾는 경로를 지정할때 사용합니다.
Oracle*Names가 설정이 안되어 있는 경우 ONAMES을 지우시는 것이 좋습니다.
7) SDU와 TDU
SDU('Session Data Unit')는 네트워크를 통해 보내는 packet의 size입니다.
이 size는 MTU(Maximum Transmission Unit)를 넘어서는 안됩니다.
MTU는 네트워크상에 고정된 값입니다.
TDU('Transport Data Unit')는 SQL*Net이 data를 함께 묶는 기본 packet size
이며 SDU의 배수여야 합니다.
다음에서 예를 들어 보겠습니다.
* SDU=1024, TDU=1536:
SQL*Net은 buffer에 1536 byptes까지 저장했다가 네트워크로 보냅니다.
낮은 network layer에서 이것을 다시 두개의 physical packets(1024,512
bytes)로
나누어 보냅니다.
* SDU=1514, TDU=1000:
SQL*Net은 buffer에 1000 byptes까지 저장했다가 네트워크로 보냅니다.
SDU는 request당 514 bytes를 더 담을 수 있는데도 불구하고 보내지기 때문에
network resource의 낭비를 초래합니다.
표준 Ethernet network에서 MTU의 default size는 1514 bytes입니다.
표준 token ring network에서 MTU의 default size는 4202 bytes입니다.
SDU와 TDU를 설정하려면 TNSNAMES.ORA 과 LISTENER.ORA 를 다음과 같이
바꾸어야 합니다.
TNSNAMES.ORA:
ORCL.WORLD =
(DESCRIPTION =
(SDU=1514)
(TDU=1514)
(ADDRESS =
(PROTOCOL = TCP)
(HOST = fu.bar)
(PORT = 1521)
(CONNECT_DATA = (SID = ORCL))
LISTENER.ORA:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SDU = 1514)
(TDU = 1514)
(SID_NAME = ORCL)
(GLOBAL_DBNAME = ORCL.WORLD)
SDU와 TDU는 modem을 사용하는 환경에서는 줄여주는 것이 좋고
fiber나 T3 line을 사용하는 환경에서는 늘려주는 것이 좋습니다.
SDU와 TDU의 default값은 2048이고 maximum값은 32768입니다.
8) PROTOCOL.ORA의 tcp.no_delay 설정
기본적으로 SQL*Net은 SDU buffer가 찰때가지 request를 전송하지 않고
기다립니다. 다시 말해 request가 도착지점으로 바로 전송되지 않는 다는것을
의미 합니다. 그런데 'no_delay'를 설정함으로써 data buffering을 하지 않게
할 수 있습니다. 따라서 'no_delay'를 설정하게 되면 작은 size의 patckets의
전송이 늘게되어 network traffic이 증가하게 됩니다.
따라서 이 parameter는 TCP timeout이 발생했을 경우에만 사용하셔야 합니다.
9) LISTENER.ORA의 QUEUESIZE 설정
QUEUESIZE는 listener가 저장할 수 있는 request의 수를 의미 합니다.
만일 들어오는 reqeusts의 수가 buffer의 size를 넘게 되면,
접속을 시도한 client는 접속을 실패하게 됩니다.
이 buffer의 size는 예상되는 동시 접속 수를 설정해 주는 것이 좋습니다.
LISTENER =
(ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = TCP)
(HOST = fu.bar)
(PORT = 1521)
(QUEUESIZE = 32)
이 parameter는 TCP/IP나 DECNET protocol이 사용될때만 사용됩니다.
10) SQLNET.ORA의 BREAK_POLL_SKIP 설정
이 parameter는 user break을 check하는 사이의 packet수를 지정합니다.
다시 말해 만일 이 parameter의 값이 높으면 CTRL-C checking은 덜 자주
일어나게되며 CPU overhead는 줄게 됩니다.
만일 이 parameter의 값이 낮으면 CTRL-C checking이 자주 발생되어
CPU overhead가 늘게 됩니다.
기본값은 4이며 client SQL*NET에만 사용됩니다.
11) SQLNET.ORA의 DISABLE_OOB 설정
Out of band break check를 enable시키거나 disable시킬때 사용하는
parameter입니다.
기본값은 off입니다.
여기서 잠간만 !
Out of Band Breaks란 무엇인가 ?
네트워크 통신상에서 받아들여지는 interrupt signals은 일반적으로
다른 data(예를 들어 select 문장)과 같이 도착하게 됩니다.
이것을 In-band Breaks라고 합니다.
그런데 이 interrupt signals을 connection과는 다른 channel을 통해
전달할 수 있습니다 이것을 Out of Band Breaks라고 하며 이 방식은
interrupt signal을 훨씬 빠르게 그리고 효과적으로 전달 할 수 있습니다.
(예를 들어 deadlock을 break하기위해 control-C를 사용하는 것)
12) PROCESS.DAT와 REGID.DAT
7.3.2 버전에서 Oracle Server Tracing은 기본적으로 enabled되어 있습니다.
따라서 모든 connection과 request가 PROCESS.DAT와 REGID.DAT에
기록이됩니다.
database의 사용기간이 길어지면 이 파일들은 접속속도를 현저히 떨어뜨리게
됩니다.
이러한 trace 파일들을 사용하지 않기위해 listener.ora파일에
'EPC_DISBLED=TRUE'를 설정해야 합니다.
This forum is for Oracle Migration Workbench issues, i.e. migration using the workbench from a non Oracle database to an Oracle database.
Here are some pointers that may be useful, but you may need to get more information elsewhere, for example Oracle Customer Support.
a Oracle 7.1 client (including your example) will connect to an Oracle 8.1.5 server.
Is the server correctly configured (can a client connect from another machine)?
Tracing can be turned on in the client, server and/or listener to get further information.
Turloch
Similar Messages
-
How to decipher SQL*Net protocols/packets?
hi,
we have a customer that sells compliance solutions that basically track and audit information at the packet level. in order to expand their customer base they would like to offer their solutions to customer that have business systems built on Oracle Forms 6.x and Pro*C. to do this they need to understand how our network communication works. is this something that is generally available? here are some details for what the partner wants from us ...
Their product intercepts the communication between a typical Db client and Db server at packet level, performs analysis on the packets and extracts the information required for SOX compliance. It's been successfully installed and working for various versions of Oracle servers and Clients, however it does not handle Oracle Forms and pro*C clients.
It also wrks for pro*c client except for bind variables and arrays.
We need information on packet formats during communication between Oracle database and Forms and pro*c clients. This will help our product to work for SOX compliance for the customers who have FORMS and pro*c clients without replacing them
I know that form Forms to DB its SQL*Net, not sure what the protocol is for PRO*C to DB communication but do we have documentation on both?Assuming you are on Windows, you can download the client installable from
http://download.oracle.com/otn/nt/oracle10g/10201/10201_client_win32.zip -- for Oracle 10g client
http://download.oracle.com/otn/nt/oracle11g/win32_11gR1_client.zip -- for Oracle 11g client
If you are looking for any other version, please mention the same. -
How to find out the size of files transferred over the SQL * Net?
I am trying to test the Advanced Compress (AC) for 11g Data Guard. When the AC is turned on, the archived log files are supposed to be compressed on the primary database server and sent over SQL*Net, then decompressed on the standby db server. We will see the file sizes are the same on both primary and standby servers. I want to verify that the AC works by monitoring how much data are sent over SQL*Net. Per Oracle, AC uses 35% less of the bandwith. That means the size of the files transferred should be at least 65% of the original size.
Is there a way to find out the size through Oracle utilities? If not, how to find out by OS utilities? OS is Solaris 5.10.
Thanks.I'm not sure this can be done via SQL*Net, but a network packet sniffer between the two servers should be able to help - you might want to contact your network team.
HTH
Srini -
제품 : SQL*NET
작성날짜 : 1997-10-10
Introduction
~~~~~~~~~~~~
For most problems you need to identify the relevant parts of a
connection to trace. To do this consider which scenario you are
having problems with and where tracing needs to be enabled.
Note that tracing produces a lot of output , especially at higher
trace levels.
There are 3 main areas of SQL*Net that can produce trace output:
1 = the SQL*Net 'client'
2 = the 'listener' process
3 = the SQL*Net 'server'.
a) Establishing a connection:
Client ----> Listener ----> Server
1 2 3
b) An established connection:
Client --------> Server
1 3
c) Opening a database link:
Client ----> Server ----> Listener -----> Server2
1 3 1 2 3
Note here that the Oracle server process is also a SQL*Net
client when it makes an outgoing call to a listener to
open a database link. Database links are OPENED when first
used. They should then remain open until closed.
d) An established database link:
Client ----> Server -----> Server2
1 3 1 3
In each case here there are several potential sampling points. You
should be able to identify quickly which of these scenarios matches
your setup. As these scenarios are likely to involve connections
between different machines you should remember that tracing for any
process is controlled by the configuration details that the process
reads WHEN IT IS STARTED. This is especially important when looking
at MTS connections as the SQL*Net server is the 'dispatcher' process.
Some dispatchers are started when the database instance is started
and others may start at a later time (on demand). Each dispatcher will
read their SQL*Net configuration WHEN THEY START.
7.2 Client Tracing
~~~~~~~~~~~~~~
For client TOOLS edit or create the file $HOME/.sqlnet.ora and add
the lines:
trace_level_client=16
trace_file_client=cli
trace_directory_client=/tmp # Or a known directory
trace_unique_client=true # Add '_pid' to trace filename
This will turn on FULL tracing for your user account only producing
output in a file called /tmp/cli_<PID>.trc .
(For some SQL*Net versions the file will be just /tmp/cli.trc)
For client 'ORACLE' process (as in the case of database links) put this
same information into $TNS_ADMIN/sqlnet.ora file.
On versions up to and including Oracle 7.0.16 client trace may not
add a process ID to the name of the trace file. This means two
processes may end up writing to the same trace file unless you
take care to control which processes write trace output to each file.
7.3 Listener Tracing
~~~~~~~~~~~~~~~~
Listener tracing can ONLY be configured in the listener.ora file.
Add the lines below to the listener.ora file:
trace_level_listener=16
trace_file_listener=listener
trace_directory_listener=/tmp # Or a known directory
This will define FULL listener tracing to the file /tmp/listener.trc.
You can enable this tracing by either:
lsnrctl reload
OR
lsnrctl stop;
lsnrctl start;
TCP/IP
~~~~~~
It is often useful to confirm that a listener is listening on a
specified address. Most Unix machines include a command called
'netstat' (Often in /etc or in /usr/etc). The command netstat -a
should list all TCP/IP end points on which a listener is listening.
Eg:
For a listener listening on HOST=... PORT=1580 there should be a
netstat entry of the form:
RecvQ SendQ Local Address Foreign Address TCP state
0 0 *.1580 *.* LISTEN
Note: Some versions of netstat will only list established connections
and not listen end points. See the man page on your machine.
7.4 Server Tracing
~~~~~~~~~~~~~~
Server side trace is not required as often as the other two traces
mainly because most problems are related to establishing a connection.
Once a connection has been established the client and server processes
are communicating. It is sometimes useful to see exactly what SQL
commands have been received by the server, and what data it has sent
back out.
The file $TNS_ADMIN/sqlnet.ora controls the server side tracing. Add
the lines below to this file:
trace_level_server=16
trace_file_server=server
trace_directory_server=/tmp # Or a known directory
Output should be sent to the file /tmp/server_<PID>.trc
Note: Server side tracing acts on the SQL*Net server side.
For dedicated connections this is the Oracle process on the
server machine.
For MTS connections this is the DISPATCHER and NOT the shared
server. Data is passed between the dispatcher and the shared
servers via the SGA and this does NOT involve SQL*Net.
It is also important to note that as a dispatcher handles
several client processes the dispatcher trace output can be a
mix of trace from many client processes making it VERY difficult
to follow. The general advice for such problems is:
a) See if the problem reproduces WITHOUT using MTS - if
so the trace is much cleaner
b) If a problem ONLY reproduces under MTS ensure the machine
is in a controlled environment so you can be sure that only
YOUR process is using the dispatcher.
7.5 Trace Summary
~~~~~~~~~~~~~
1) Identify where you need to trace.
2) Identify which files on which machines control tracing at these
points. Tracing is controlled in the following files:
Client Server Listener
~~~~~~ ~~~~~~ ~~~~~~~~
Files: $HOME/.sqlnet.ora sqlnet.ora listener.ora
sqlnet.ora
3) Add in the relevant trace parameters (See Below)
4) Restart any processes that need to read the new trace values.
Reload the listener as required.
5) Reproduce your problem
6) Save all your trace output immediately
7) Disable the tracing
7.6 Main Trace Parameters
~~~~~~~~~~~~~~~~~~~~~
trace_level_listener = off
trace_file_listener = Filename *1
trace_directory_listener = Directory *2
*1 Unquoted (") filenames will be translated into lower case.
*2 You CANNOT use environment variables in the Filename or Directory
name.
7.7 Diagnosing Trace output
~~~~~~~~~~~~~~~~~~~~~~~
Trace output can be very difficult to follow. Before looking at a
trace file make sure:
a) You are familiar with the sequence of events in setting up
a connection. SQL*Net connections follow a sequence of
events - you will need to determin where in the sequence
the problem occurs.
b) Do not be misled by error reports in the trace files. You
must follow the context of the errors - an error may be
quite valid at that point in a sequence. Eg: For client
connections a list of addresses to call is built - if the
first address yeilds no response the next address is tried.
This next address may yeild a response and the 'true' error
occurs at this point in the sequence.
c) Do not be misled by unusual 'Bequeath' connections in the
trace. If an error is received over SQL*Net the client
may use a "Bequeath" operation to spawn an oracle process
which it then uses to get the TEXT of the error. A very short
exchange of packets occurs and the bequethed process exits.
The 'TRUE' problem is likely to be before this bequeath
operation.
Useful trace 'tags':
The following are useful items to follow in trace files - these
are not guaranteed to be valid across all SQL*Net releases and
are for guidance only. Entries are assumed to be taken at trace
level 16 to allow data packets to be seen. This will produce a
LOT of trace output.
-<ERROR>-
Error information follows. Remember the error may be acceptable
osntns: Calling address
Shows address list constructed for a call OUT to a listener
nricall: Making call with following address information: ...
Shows the ACTUAL address being called from the above list
nsopen: entry
We are about to try and open a connection.
nsopen: transport is open
nsopen: error exit
A connection to the called address has been made / failed.
nsclose: ...
An established connection is being closed - check nearby
for errors.
nscall: redirected
The client has been redirected to a differenct address.
The next step should be to call the new address. The address
should appear in an earlier data packet.
nspsend / nsprecv
Outgoung / Incoming dataThis forum is for Oracle Migration Workbench issues, i.e. migration using the workbench from a non Oracle database to an Oracle database.
Here are some pointers that may be useful, but you may need to get more information elsewhere, for example Oracle Customer Support.
a Oracle 7.1 client (including your example) will connect to an Oracle 8.1.5 server.
Is the server correctly configured (can a client connect from another machine)?
Tracing can be turned on in the client, server and/or listener to get further information.
Turloch -
Process wait SQL*Net message from dblink /SQL*Net message from client
Hi There,
We have an ETL process that we kindly need your help with. The process been running since Sun, where it transfers the data from one server (via remote query). The process was running ok till last night where it appeared
to have stopped working and/or the session is just idling doing nothing.
Here are some tests that we did to figure out what's going on:
1. when looking at the session IO, we noticed that it's not changing:
etl_user@datap> select sess_io.sid,
2 sess_io.block_gets,
3 sess_io.consistent_gets,
4 sess_io.physical_reads,
5 sess_io.block_changes,
6 sess_io.consistent_changes
7 from v$sess_io sess_io, v$session sesion
8 where sesion.sid = sess_io.sid
9 and sesion.username is not null
10 and sess_io.sid=301
11 order by 1;
logical physical
SID BLOCK_GETS reads reads BLOCK_CHANGES CONSISTENT_CHANGES
301 388131317 97721268 26687579 223052804 161334
Elapsed: 00:00:00.012. Check there is nothing blocking the session
etl_user@datap> select * from v$lock where sid=301;
ADDR KADDR SID TY ID1 ID2 LMODE REQUEST CTIME BLOCK
684703F0 6847041C 301 DX 35 0 1 0 45237 0
684714C4 684714F0 301 AE 199675 0 4 0 260148 0
619651EC 6196521C 301 TM 52733 0 3 0 45241 0
67F86ACC 67F86B0C 301 TX 458763 52730 6 0 45241 03. Check if the session is still valid:
etl_user@datap> select status from v$session where sid=301;
STATUS
ACTIVE4. Check if there is anything in long ops that has not completed:
etl_user@datap> SELECT SID, SERIAL#, opname, SOFAR, TOTALWORK,
2 ROUND(SOFAR/TOTALWORK*100,2) COMPLETE, TIME_REMAINING/60
3 FROM V$SESSION_LONGOPS
4 WHERE
5 TOTALWORK != 0
6 AND SOFAR != TOTALWORK
7 order by 1;
no rows selected
Elapsed: 00:00:00.005. Check if there is anything in long ops for the session:
etl_user@datap> r
1* select SID,SOFAR,TOTALWORK,START_TIME,LAST_UPDATE_TIME,TIME_REMAINING,MESSAGE from V$SESSION_LONGOPS where sid=301
SID SOFAR TOTALWORK START_TIM LAST_UPDA TIME_REMAINING MESSAGE
301 0 0 22-JUL-12 22-JUL-12 Gather Table's Index Statistics: Table address_etl : 0 out of 0 Indexes done
Elapsed: 00:00:00.00This is a bit odd!! This particular step have actually completed successfully on the 22nd of July, and we don't know why it's still showing in long opps!? any ideas?
6. Looking at the sql and what's it actually doing:
etl_user@datap> select a.sid, a.value session_cpu, c.physical_reads,
2 c.consistent_gets,d.event,
3 d.seconds_in_wait
4 from v$sesstat a,v$statname b, v$sess_io c, v$session_wait d
5 where a.sid= &p_sid_number
6 and b.name = 'CPU used by this session'
7 and a.statistic# = b.statistic#
8 and a.sid=c.sid
9 and a.sid=d.sid;
Enter value for p_sid_number: 301
old 5: where a.sid= &p_sid_number
new 5: where a.sid= 301
CPU physical logical seconds
SID used reads reads EVENT waiting
301 1966595 26687579 97721268 SQL*Net message from dblink 45792
Elapsed: 00:00:00.037. We looked at the remote DB where the data resides on, and we noticed that the remote session was also waiting on the db link:
SYS@destp> select a.sid, a.value session_cpu, c.physical_reads,
2 c.consistent_gets,d.event,
3 d.seconds_in_wait
4 from v$sesstat a,v$statname b, v$sess_io c, v$session_wait d
5 where a.sid= &p_sid_number
6 and b.name = 'CPU used by this session'
7 and a.statistic# = b.statistic#
8 and a.sid=c.sid
9 and a.sid=d.sid;
Enter value for p_sid_number: 388
old 5: where a.sid= &p_sid_number
new 5: where a.sid= 390
SID SESSION_CPU PHYSICAL_READS CONSISTENT_GETS EVENT SECONDS_IN_WAIT
390 136 0 7605 SQL*Net message from client 46101
SYS@destp>We have had an issue in the past where the connection was being dropped by the network when the process runs for few days, hence we have added the following to the sqlnet.ora and listener.ora files:
sqlnet.ora:
SQLNET.EXPIRE_TIME = 1
SQLNET.INBOUND_CONNECT_TIMEOUT = 6000
listener.ora:
INBOUND_CONNECT_TIMEOUT_LISTENER = 6000What else can we do and/or further investigate to work out the root cause of the problem, and may be help resolve this. We don't want to just stop and start the process again as it took few days already. We have
had a chat to the infrastructure team and they've assured us that there have been no network outages.
Also, the alert logs for both instances (local and remote) shows no errors what so ever!
Your input is highly appreciated.
Thanks
Edited by: rsar001 on Jul 25, 2012 10:22 AMRan the query on both local/remote db, and no rows returned:
etl_user@datap> SELECT DECODE(request,0,'Holder: ','Waiter: ')||vl.sid sess, status,
2 id1, id2, lmode, request, vl.type
3 FROM V$LOCK vl, v$session vs
4 WHERE (id1, id2, vl.type) IN
5 (SELECT id1, id2, type FROM V$LOCK WHERE request>0)
6 and vl.sid = vs.sid
7 ORDER BY id1, request
8 /
no rows selected
Elapsed: 00:00:00.21 -
Oracle12c SQL*NET blocked by Windows 2008 firewall - what is the correct solution?
Hello,
I have a question with regards to the SQL*NET traffic being blocked by the Windows 2008 firewall. This document shows that disabling the firewall can resolve the problem:
https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=166773506396122&id=1472931.1&displayIndex=13&_afrWindowMode=0&_adf.ctrl-state=o4dq0hlih_112
Is this really the solution?
From what I understand from other documents is that just enabling port 1521 will not resolve any issues, as SQL*NET can use redirection to other random ports. That is probably the reason why the Oracle installation does not alter any firewall settings.
What other methods do people use to connect a client to a DB server?
This document shows what other methods to use, but who uses them?
https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=166043735580557&id=68652.1&_afrWindowMode=0&_adf.ctrl-state=o4dq0hlih_78
Does anyone use the Oracle Connection Manager for example?
Thanks
RichardI configure firewall to allow DB Server to start new network connections
-
Sql*net patch version 2.3.2.1.12 down load
While I am migrating 7.3 database to 8i, system is asking for install sql net patch version 2.3.2.1.12. How can I get this patch. Is it possible to download.
Thanks/Rgds
BijuI know that I should first download and apply the AD related patches separetly. But, what is the best practice for downloading the rest of them? How does an experienced Applications DBA handle this kind of situation? I was trying to use the Patching Wizard on OAM, but the request errored out stating that "****No codeline specified". Where do I specify this when I download a list of patches? I just pasted a comma separated list of 249 patches into the PatchList field on Download Patches page.Please see these docs.
'Analyze specific Patch' via Patchwizard is failing with java.lang.NullPointerException [ID 1066985.1]
Patch Wizard Utility [ID 976188.1]
Patch Wizard FAQ [ID 976688.1]
Patch Wizard : Overview [ID 1077813.1]
Thanks,
Hussein -
How to connect to DB in repository assistant using SQL*net
Hi all,
We are in RAC enviroment. When I try to connecting to oracle DB in repository assistant (the page that asks for SYS account), I check the SQL*net, and enter the net service name (absolutly also enter the SYS and SYS psw field), but the 'next' button is grey out.
according to installation guide, in a RAC environment, do not type the host name, port number and oracle service name. But in my case, I have to enter all these fields to enable the 'next' button.
any idea of how to fix it?
thanksI forget to say that I can connect to the repository browser using SQL*net. So I suppose that net service name is correct.
thanks for any suggestion. -
How to drill down the cause of "SQL*Net message from/to client"
Pretty frustrated with my tune up using suggestions from many papers for Oracle 10g R2 on AIX 5.3 L system. My users told me that the system (including Baan 5c) still responds slowly in some processes, some even worsen.
Using both queries such as
SELECT sid, schemaname, status FROM gv$session ORDER BY 2;
SELECT inst_id, seq#, event, p1, p2, p3, wait_time FROM v$session_wait_history WHERE sid=<sid from above>
INST_ID SEQ# EVENT P1 P2 P3 WAIT_TIME
1 1 SQL*Net message from client 1413697536 1 0 6419
1 2 SQL*Net message to client 1413697536 1 0 0
and others similar, I found very large numbers (almost 97%) of the sessions have events as “SQL*Net message to client” and “SQL*Net message from client” on their wait_time even the sids are in inactive status. After checking the meaning of those messages in Oracle Performance and Tuning document, the document states that mainly they are probably network problems. So How can I drill down to what status of network from my client (the users) to server by Oracle or AIX? In Baan, it has its own parameter sets in its db_resource file controlling the connectivity. In average, there are 4000 “opened cursor current”, but most of them inactives.
So my colleague asked me rollback all th changes I did on OS level such as minperm%=5
maxperm%=90
maxclient%=90,
lgpg_regions lgpg_size,
sys0 maxuproc=512,
aio0 maxservers='260'
and many ioo parameters to system defaults.
I even removed the mulitplex copy of the redo log.
I tried to proof them that there maybe the problem of the Baan/Oracle connectivity, ie due to message above,http://docs.oracle.com ... read them for configuration information.
http://tahiti.oracle.com ... read them for recommendations.
http://otn.oracle.com ... find the best practices docs.
http://metalink.oracle.com ... look for similar issues to yours.
People that change things, on production boxes, without first determining that metrics indicate they are a good idea, and then determining their impact on a test box, should be sold to zoos as leopard food.
PS: Slowly likely has absolutely nothing to do with anything you touched. First you tune the application. Then you tune the database. Then you tune the operating system. Get out of the way and make the DBAs do their job. -
TCP/IP IN SQL*NET & SLIP / PPP
제품 : SQL*NET
작성날짜 : 1997-10-10
SLIP (Serial Line Internet Protocol)
SLIP 과 Ethernet 은 TCP/IP 을 구현하는 매체에 규정되어지는 두개의
PROTOCOL 입니다
SLIP은 serial/modem lines 에 사용되어지며, Ethernet은 Coaxial
cable 에 사용되어집니다
SQL*NET 에서는 이 두가지가 차이가 없으며, SQL*NET 은 이 두 가지를
단지 TCP/IP 로 볼 뿐입니다.
그림으로 보면 다음과 같읍니다
| SQL*Net |
| Tcp/ip |
-------------------+
| SLIP | Ether |
-------------------+
| Serial| Coax |
SLIP 대신에 PPP 를 사용하는 것은 serial TCP/IP 통신을 하는 새로운
방법입니다
이러한 방법은 SQL*NET 과는 직접적인 관련이 없으며, SQL*NET 은
Serial Line 을 통해 바로 접속이 됩니다.
따라서 Serial line (Modem)과 Ethernet (Lan card) 을 통한 접속은
TCP/IP 설정만 올바르게 되어있다면 SQL*NET 이상없이 접속할수
있으며 이상유무를 SQL*NET 에서 볼수는 없읍니다When someone answers you, please forward the answer to my email. I am trying to connect to an Oracle db from Visual Basic, and need the component. I have downloaded software from this site, but it did not have the SQL Net.
-
Hello,
Can someone please help me get oriented in the following:
Clients have Oracle Forms Developer 6i installed on 100 machines. This is from 1996 I think. It comes with SQL*Net 8.
They want a simple utility that uploads a file into a blob field on the remote database.
I already developed the utility thinking that they have Oracle 9i2 installed - so I used OCCI. This is not a possibility with the old technology they are actually using..
So what is the place to start?
Thank you!!
davidYou can try with PRO-C
-
Oracle SQL*Net and TNS Protocol
I need to get technical documents on Oracle SQL*Net and TNS Proticol, down to the bit-level definition. I have talked to serveral people in Oracle Documentation, Sales and Tech Support, but no one could give me any clue so far. Any one can help me on this?
SQL*Net is installed by default with SQL*Plus and any of the clients (OEM uses the JDBC OCI driver and some native connectivity).
It is likely that the version of the client you have installed is not one that TOAD can work with or it can't find the client (is the Oracle home/bin directory in the path?) -
CLIENT SIDE TRACING IN SQL*NET V2
제품 : SQL*NET
작성날짜 : 1997-10-10
Client Tracing
~~~~~~~~~~~~~~
1) Set the environment variable TNS_ADMIN to the directory where the
tnsnames.ora and listener.ora files exist.
The default location is $ORACLE_HOME/network/admin. Set $TNS_ADMIN
to this if it is not set. This ENSURES you know which files you are
using.
2) Start the listener: lsnrctl
> set password <password>
> start
Note any errors. If you do not have a password set then ignore the
set password command.
3) If the listener started, start the database.
4) Create a file in $HOME called .sqlnet.ora and add the lines:
trace_level_client= 16
trace_file_client=client
trace_directory_client= /tmp (or similar)
trace_unique_client=true
5) Try to connect from SQL*Plus thus:
sqlplus username/password@alias
or
sqlplus username/password
substituting a suitable alias.
6) If you get an error we may need to see the client trace file
/tmp/client_<PID>.trc where <PID> is the process ID of the
client process (*1).
This will be quite large so it is best to FAX or EMAIL it.
*1 Note: On earlier versions of SQL*Net the filename may NOT have
the process ID appended to it.
Listener Tracing:
~~~~~~~~~~~~~~~~~
1) Edit your $TNS_ADMIN/listener.ora file and add the lines:
TRACE_LEVEL_LISTENER = 16
TRACE_DIRECTORY_LISTENER = /tmp
TRACE_FILE_LISTENER = "listener"
2) Stop and restart the listener:
lsnrctl stop
lsnrctl start
Output should go to /tmp/listener.trcBy default in 11g traces will go to the ADR which is a new feature.
To disable that feature add the following line to your sqlnet.ora
diag_adr_enabled =OFF
[oops] saw that this is over a month old this post - sorry about that!
hope that helps
John
Edited by: Johnsung on Sep 27, 2012 3:59 PM -
Query started taking longer time with SQL*Net message from dblink
Hi,
Since Yesterday we started see one query which normally used to take 3 min but now it started taking 70 min after a small change do the query instead of accessing view we started accessing directly table.
Both Schema's are on same DB.
Oracle version=11.2.0.2
OS=Solaris 10
Existing Query
WITH ot_symbol_data_v AS
(SELECT dat.symbol, dat.startdate, dat.enddate, oi.currencycode,
dat.primarymarket, primsymb.symbol primarysymbol, dat.mic,
dat.universeid, dat.symbology
FROM onetick_symbol_data@refdata_link dat
LEFT JOIN
(SELECT symbology, universeid, mic, MAX (enddate) enddate
FROM onetick_symbol_data@refdata_link
GROUP BY symbology, universeid, mic) prim
ON prim.symbology = dat.symbology
AND prim.universeid = dat.universeid
AND prim.mic = dat.primarymarket
LEFT JOIN onetick_symbol_data@refdata_link primsymb
ON prim.symbology = primsymb.symbology
AND prim.universeid = primsymb.universeid
AND prim.mic = primsymb.mic
AND prim.enddate = primsymb.enddate
JOIN onetick_isincur_data@refdata_link oi
ON dat.universeid = oi.universeid
JOIN
(SELECT universeid, MAX (enddate) AS enddate
FROM onetick_isincur_data@refdata_link
GROUP BY universeid) oilatest
ON oi.universeid = oilatest.universeid
AND oi.enddate = oilatest.enddate
ORDER BY dat.universeid, dat.mic, dat.symbology, dat.enddate)
SELECT i.instrumentid
|| '||'
|| i.firsttradingdate
|| '000000|'
|| NVL (i.delisteddate, '30001231')
|| '000000|'
|| i.home_market
|| '|'
|| DECODE (imfm.feedid, 0, 'FIXN_RFA', 1, 'ALGO', 2, 'FIXNETIX')
|| '::'
|| osdv.primarysymbol
FROM tibex_meinstrumentview i JOIN tibex_instrumentmicfeedmapview imfm
ON i.isin = imfm.isin
AND i.currencycode = imfm.currencycode
AND i.home_market = imfm.mic
JOIN rd_universeview@refdata_link u
ON i.instrumentid = u.instrumentid AND i.instrumentstatus != 3
and active='Y'
JOIN
(SELECT universeid, DECODE (symbology, 1, 0, 2, 2, -1) feedid,
primarysymbol
FROM ot_symbol_data_v
GROUP BY universeid, symbology, primarysymbol) osdv
ON u.universeid = osdv.universeid
WHERE osdv.feedid = imfm.feedid
ORDER BY i.isin, i.currencycode, i.instrumentid;
New Query
WITH ot_symbol_data_v AS
(SELECT dat.symbol, dat.startdate, dat.enddate, oi.currencycode,
dat.primarymarket, primsymb.symbol primarysymbol, dat.mic,
dat.universeid, dat.symbology
FROM onetick_symbol_data@refdata_link dat
LEFT JOIN
(SELECT symbology, universeid, mic, MAX (enddate) enddate
FROM onetick_symbol_data@refdata_link
GROUP BY symbology, universeid, mic) prim
ON prim.symbology = dat.symbology
AND prim.universeid = dat.universeid
AND prim.mic = dat.primarymarket
LEFT JOIN onetick_symbol_data@refdata_link primsymb
ON prim.symbology = primsymb.symbology
AND prim.universeid = primsymb.universeid
AND prim.mic = primsymb.mic
AND prim.enddate = primsymb.enddate
JOIN onetick_isincur_data@refdata_link oi
ON dat.universeid = oi.universeid
JOIN
(SELECT universeid, MAX (enddate) AS enddate
FROM onetick_isincur_data@refdata_link
GROUP BY universeid) oilatest
ON oi.universeid = oilatest.universeid
AND oi.enddate = oilatest.enddate
ORDER BY dat.universeid, dat.mic, dat.symbology, dat.enddate)
SELECT i.instrumentid
|| '||'
|| i.firsttradingdate
|| '000000|'
|| NVL (i.delisteddate, '30001231')
|| '000000|'
|| i.home_market
|| '|'
|| DECODE (imfm.feedid, 0, 'FIXN_RFA', 1, 'ALGO', 2, 'FIXNETIX')
|| '::'
|| osdv.primarysymbol
FROM tibex_meinstrumentview i JOIN tibex_instrumentmicfeedmapview imfm
ON i.isin = imfm.isin
AND i.currencycode = imfm.currencycode
AND i.home_market = imfm.mic
JOIN universe@refdata_link u
ON i.instrumentid = u.instrumentid AND i.instrumentstatus != 3
and active='Y'
JOIN
(SELECT universeid, DECODE (symbology, 1, 0, 2, 2, -1) feedid,
primarysymbol
FROM ot_symbol_data_v
GROUP BY universeid, symbology, primarysymbol) osdv
ON u.universeid = osdv.universeid
WHERE osdv.feedid = imfm.feedid
ORDER BY i.isin, i.currencycode, i.instrumentid;Most of the wait event is
SQL*Net message from dblink
SQL*Net message to dblink
Regards
NMHi Kim,
uat_trd_owner@UAT001> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 741667790
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Inst |IN-OUT|
| 0 | SELECT STATEMENT | | 1 | 137 | 21981 (2)| 00:04:24 | | |
| 1 | SORT ORDER BY | | 1 | 137 | 21981 (2)| 00:04:24 | | |
|* 2 | HASH JOIN OUTER | | 1 | 137 | 21980 (2)| 00:04:24 | | |
|* 3 | HASH JOIN OUTER | | 1 | 131 | 422 (4)| 00:00:06 | | |
| 4 | NESTED LOOPS | | | | | | | |
| 5 | NESTED LOOPS | | 1 | 125 | 107 (9)| 00:00:02 | | |
| 6 | NESTED LOOPS | | 20 | 1680 | 87 (11)| 00:00:02 | | |
|* 7 | HASH JOIN | | 1 | 64 | 86 (11)| 00:00:02 | | |
| 8 | VIEW | TIBEX_INSTRUMENTMICFEEDMAPVIEW | 1 | 34 | 84 (9)| 00:00:02 | | |
| 9 | HASH GROUP BY | | 1 | 166 | 84 (9)| 00:00:02 | | |
|* 10 | HASH JOIN RIGHT OUTER | | 267 | 44322 | 83 (8)| 00:00:01 | | |
| 11 | TABLE ACCESS FULL | TIBEX_BOARDFEEDMAP | 1 | 20 | 3 (0)| 00:00:01 | | |
| 12 | NESTED LOOPS OUTER | | 267 | 38982 | 80 (8)| 00:00:01 | | |
| 13 | NESTED LOOPS OUTER | | 267 | 21627 | 80 (8)| 00:00:01 | | |
|* 14 | HASH JOIN | | 267 | 17088 | 80 (8)| 00:00:01 | | |
| 15 | MERGE JOIN CARTESIAN | | 2004 | 88176 | 37 (0)| 00:00:01 | | |
| 16 | INDEX FULL SCAN | TIBEX_EDPDEFAULTFEED_PK | 1 | 3 | 1 (0)| 00:00:01 | | |
| 17 | BUFFER SORT | | 2004 | 82164 | 36 (0)| 00:00:01 | | |
|* 18 | TABLE ACCESS FULL | TIBEX_INSTRUMENT | 2004 | 82164 | 36 (0)| 00:00:01 | | |
| 19 | VIEW | TIBEX_EDPINSTRUMENTMARKETSVIEW | 22040 | 430K| 42 (12)| 00:00:01 | | |
| 20 | HASH GROUP BY | | 22040 | 430K| 42 (12)| 00:00:01 | | |
| 21 | VIEW | | 22040 | 430K| 41 (10)| 00:00:01 | | |
| 22 | SORT UNIQUE | | 22040 | 544K| 41 (57)| 00:00:01 | | |
| 23 | UNION-ALL | | | | | | | |
| 24 | INDEX FAST FULL SCAN| TIBEX_EDPFIXNETIXL1_R01 | 7578 | 162K| 18 (0)| 00:00:01 | | |
| 25 | TABLE ACCESS FULL | TIBEX_EDPIXSYMBOLS | 7494 | 197K| 12 (0)| 00:00:01 | | |
| 26 | TABLE ACCESS FULL | TIBEX_EDPRFALGOSUBSCRIPTION | 6968 | 183K| 7 (0)| 00:00:01 | | |
|* 27 | INDEX RANGE SCAN | TIBEX_MICFEEDMAP_PK | 1 | 17 | 0 (0)| 00:00:01 | | |
| 28 | TABLE ACCESS BY INDEX ROWID| TIBEX_INSTRUMENTFEEDMAP | 1 | 65 | 0 (0)| 00:00:01 | | |
|* 29 | INDEX UNIQUE SCAN | TIBEX_INSTRUMENTFEEDMAP_PK | 1 | | 0 (0)| 00:00:01 | | |
| 30 | VIEW | | 100 | 3000 | 1 (100)| 00:00:01 | | |
| 31 | REMOTE | | | | | | REFDA~ | R->S |
| 32 | REMOTE | UNIVERSE | 20 | 400 | 1 (0)| 00:00:01 | REFDA~ | R->S |
|* 33 | INDEX UNIQUE SCAN | XPKTIBEX_INSTRUMENT | 1 | | 0 (0)| 00:00:01 | | |
|* 34 | TABLE ACCESS BY INDEX ROWID | TIBEX_INSTRUMENT | 1 | 41 | 1 (0)| 00:00:01 | | |
| 35 | VIEW | TIBEX_MELASTEXPRICEINTVIEW | 36 | 216 | 314 (2)| 00:00:04 | | |
| 36 | HASH UNIQUE | | 36 | 1656 | 314 (2)| 00:00:04 | | |
|* 37 | HASH JOIN | | 36 | 1656 | 313 (1)| 00:00:04 | | |
| 38 | VIEW | VW_SQ_1 | 304 | 5776 | 157 (2)| 00:00:02 | | |
| 39 | HASH GROUP BY | | 304 | 7296 | 157 (2)| 00:00:02 | | |
|* 40 | TABLE ACCESS FULL | TIBEX_EXECUTION | 17462 | 409K| 156 (1)| 00:00:02 | | |
| 41 | TABLE ACCESS FULL | TIBEX_EXECUTION | 17463 | 460K| 156 (1)| 00:00:02 | | |
| 42 | VIEW | TIBEX_MSGSEQBYINSTRUMENT | 3908 | 23448 | 21558 (2)| 00:04:19 | | |
| 43 | HASH GROUP BY | | 3908 | 74252 | 21558 (2)| 00:04:19 | | |
| 44 | VIEW | | 11626 | 215K| 21556 (2)| 00:04:19 | | |
| 45 | UNION-ALL | | | | | | | |
| 46 | HASH GROUP BY | | 1460 | 26280 | 8906 (1)| 00:01:47 | | |
| 47 | TABLE ACCESS FULL | TIBEX_QUOTE | 1362K| 23M| 8866 (1)| 00:01:47 | | |
| 48 | HASH GROUP BY | | 677 | 12186 | 11750 (2)| 00:02:21 | | |
| 49 | TABLE ACCESS FULL | TIBEX_ORDER | 1790K| 30M| 11696 (1)| 00:02:21 | | |
| 50 | HASH GROUP BY | | 304 | 5472 | 157 (2)| 00:00:02 | | |
|* 51 | TABLE ACCESS FULL | TIBEX_EXECUTION | 17463 | 306K| 156 (1)| 00:00:02 | | |
| 52 | HASH GROUP BY | | 1 | 40 | 3 (34)| 00:00:01 | | |
|* 53 | TABLE ACCESS FULL | TIBEX_TSTRADE | 1 | 40 | 2 (0)| 00:00:01 | | |
| 54 | HASH GROUP BY | | 717 | 11472 | 229 (1)| 00:00:03 | | |
| 55 | INDEX FAST FULL SCAN | IX_BESTEXREL | 7323 | 114K| 228 (0)| 00:00:03 | | |
| 56 | HASH GROUP BY | | 1911 | 34398 | 13 (8)| 00:00:01 | | |
|* 57 | TABLE ACCESS FULL | TIBEX_MERESUMEPRDTRANSITION | 5216 | 93888 | 12 (0)| 00:00:01 | | |
PLAN_TABLE_OUTPUT
| 58 | HASH GROUP BY | | 3 | 51 | 5 (20)| 00:00:01 | | |
| 59 | TABLE ACCESS FULL | TIBEX_EDPUPDATEREJECT | 48 | 816 | 4 (0)| 00:00:01 | | |
| 60 | HASH GROUP BY | | 1587 | 46023 | 215 (2)| 00:00:03 | | |
|* 61 | HASH JOIN | | 35166 | 995K| 213 (1)| 00:00:03 | | |
| 62 | INDEX FULL SCAN | XPKTIBEX_CONFIGMEGROUP | 4 | 16 | 1 (0)| 00:00:01 | | |
| 63 | TABLE ACCESS FULL | TIBEX_INSTRUMENTADMIN | 87915 | 2146K| 212 (1)| 00:00:03 | | |
| 64 | HASH GROUP BY | | 6 | 102 | 5 (20)| 00:00:01 | | |
| 65 | TABLE ACCESS FULL | TIBEX_BESTEXECPRICELOG | 793 | 13481 | 4 (0)| 00:00:01 | | |
| 66 | HASH GROUP BY | | 1 | 40 | 3 (34)| 00:00:01 | | |
|* 67 | TABLE ACCESS FULL | TIBEX_AUCTIONPRICE | 1 | 40 | 2 (0)| 00:00:01 | | |
| 68 | HASH GROUP BY | | 1587 | 28566 | 236 (2)| 00:00:03 | | |
|* 69 | TABLE ACCESS FULL | TIBEX_ADMINACK | 87915 | 1545K| 233 (1)| 00:00:03 | | |
| 70 | HASH GROUP BY | | 1914 | 34452 | 26 (8)| 00:00:01 | | |
| 71 | INDEX FAST FULL SCAN | INSTRUMENTSTATEMSGSEQ | 23705 | 416K| 24 (0)| 00:00:01 | | |
| 72 | HASH GROUP BY | | 1458 | 26244 | 8 (13)| 00:00:01 | | |
| 73 | INDEX FAST FULL SCAN | TIBEX_FREEZEEOTPK | 5890 | 103K| 7 (0)| 00:00:01 | | |
Predicate Information (identified by operation id):
2 - access("A"."INSTRUMENTID"="C"."INSTRUMENTID"(+))
3 - access("A"."INSTRUMENTID"="B"."INSTRUMENTID"(+))
7 - access("OSDV"."FEEDID"="IMFM"."FEEDID")
10 - access("I"."PRIMARYSTATUSBOARDID"="BOARDFM"."BOARDID"(+))
14 - access("SUBSC"."ISIN"="I"."ISIN" AND "SUBSC"."CURRENCYCODE"="I"."CURRENCYCODE")
filter("SUBSC"."HOMEMARKET" IS NULL OR "SUBSC"."HOMEMARKET"="I"."HOME_MARKET")
18 - filter("I"."INSTRUMENTSTATUS"<>3)
27 - access("SUBSC"."MIC"="MICFM"."MIC"(+))
29 - access("I"."INSTRUMENTID"="INSTRFM"."INSTRUMENTID"(+))
33 - access("A"."INSTRUMENTID"="U"."INSTRUMENTID")
34 - filter("A"."INSTRUMENTSTATUS"<>3 AND TO_DATE("A"."FIRSTTRADINGDATE",'YYYYMMDD')<=SYSDATE@! AND "A"."ISIN"="IMFM"."ISIN"
AND "A"."CURRENCYCODE"="IMFM"."CURRENCYCODE" AND "A"."HOME_MARKET"="IMFM"."MIC")
37 - access("A"."MESSAGESEQUENCE"="MAX(B.MESSAGESEQUENCE)" AND "A"."INSTRUMENTID"="ITEM_0")
40 - filter(("B"."SELLENTITYTYPE"=0 OR "B"."SELLENTITYTYPE"=2) AND ("B"."BUYENTITYTYPE"=0 OR "B"."BUYENTITYTYPE"=2))
51 - filter("INSTRUMENTID" IS NOT NULL)
53 - filter("INSTRUMENTID" IS NOT NULL)
57 - filter("INSTRUMENTID" IS NOT NULL)
61 - access("ADMINUSER"="MEGROUPID")
67 - filter("INSTRUMENTID" IS NOT NULL)
69 - filter("INSTRUMENTID" IS NOT NULL)
Remote SQL Information (identified by operation id):
31 - EXPLAIN PLAN INTO PLAN_TABLE@! FOR SELECT "A1"."UNIVERSEID",DECODE("A1"."SYMBOLOGY",1,0,2,2,(-1)),"A1"."PRIMARYSYMBOL"
FROM (SELECT "A6"."SYMBOL" "SYMBOL","A6"."STARTDATE" "STARTDATE","A6"."ENDDATE" "ENDDATE","A3"."CURRENCYCODE"
"CURRENCYCODE","A6"."PRIMARYMARKET" "PRIMARYMARKET","A4"."SYMBOL" "PRIMARYSYMBOL","A6"."MIC" "MIC","A6"."UNIVERSEID"
"UNIVERSEID","A6"."SYMBOLOGY" "SYMBOLOGY" FROM "ONETICK_SYMBOL_DATA" "A6", (SELECT "A7"."SYMBOLOGY"
"SYMBOLOGY","A7"."UNIVERSEID" "UNIVERSEID","A7"."MIC" "MIC",MAX("A7"."ENDDATE") "ENDDATE" FROM "ONETICK_SYMBOL_DATA" "A7" GROUP
BY "A7"."SYMBOLOGY","A7"."UNIVERSEID","A7"."MIC") "A5","ONETICK_SYMBOL_DATA" "A4","ONETICK_ISINCUR_DATA" "A3", (SELECT
"A8"."UNIVERSEID" "UNIVERSEID",MAX("A8"."ENDDATE") "ENDDATE" FROM "ONETICK_ISINCUR_DATA" "A8" GROUP BY "A8"."UNIVERSEID") "A2"
WHERE "A3"."UNIVERSEID"="A2"."UNIVERSEID" AND "A3"."ENDDATE"="A2"."ENDDATE" AND "A6"."UNIVERSEID"="A3"."UNIVERSEID" AND
"A5"."ENDDATE"="A4"."ENDDATE"(+) AND "A5"."MIC"="A4"."MIC"(+) AND "A5"."UNIVERSEID"="A4"."UNIVERSEID"(+) AND
"A5"."SYMBOLOGY"="A4"."SYMBOLOGY"(+) AND "A5"."MIC"(+)="A6"."PRIMARYMARKET" AND "A5"."UNIVERSEID"(+)="A6"."UNIVERSEID" AND
"A5"."SYMBOLOGY"(+)="A6"."SYMBOLOGY" ORDER BY "A6"."UNIVERSEID","A6"."MIC","A6"."SYMBOLOGY","A6"."ENDDATE") "A1" GROUP BY
"A1"."UNIVERSEID","A1"."SYMBOLOGY","A1"."PRIMARYSYMBOL" (accessing 'REFDATA_LINK' )
32 - SELECT "INSTRUMENTID","UNIVERSEID" FROM "UNIVERSE" "U" WHERE "UNIVERSEID"=:1 (accessing 'REFDATA_LINK' )
127 rows selected.
For trace files
WAIT #18446741324892119016: nam='SQL*Net message to client' ela= 2 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151855125079
WAIT #18446741324892119016: nam='SQL*Net message from client' ela= 182 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151855125694
=====================
PARSING IN CURSOR #18446741324892117968 len=52 dep=0 uid=474 oct=47 lid=474 tim=42151855125777 hv=1029988163 ad='af4d0890' sqlid='9babjv8yq8ru3'
BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES); END;
END OF STMT
PARSE #18446741324892117968:c=0,e=42,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=0,tim=42151855125769
WAIT #18446741324892117968: nam='SQL*Net message to client' ela= 2 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151855126145
EXEC #18446741324892117968:c=0,e=262,p=0,cr=0,cu=0,mis=0,r=1,dep=0,og=1,plh=0,tim=42151855126176
*** 2012-11-20 15:18:56.839
WAIT #18446741324892117968: nam='SQL*Net message from client' ela= 10252982 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151865379208
CLOSE #18446741324892119016:c=0,e=13,dep=0,type=1,tim=42151865379327
CLOSE #18446741324892117968:c=0,e=28,dep=0,type=3,tim=42151865379370
WAIT #18446741324892082152: nam='single-task message' ela= 47849 p1=0 p2=0 p3=0 obj#=-1 tim=42151865429221
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 107 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151865429886
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 2 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151865429945
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 926 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151865430901
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 2 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151865431578
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 2525 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151865434125
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 1 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670108
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 58 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670178
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 0 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670235
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 60 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670310
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 1 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670337
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 59 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670407
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 0 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670464
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 60 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670539
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 1 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670566
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 59 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670636
WAIT #18446741324892082152: nam='SQL*Net message to dblink' ela= 1 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670693
WAIT #18446741324892082152: nam='SQL*Net message from dblink' ela= 60 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=42151894670768Regards
NM -
Getting SQL*Net more data from client waits when running a query through web based interface
Hi, you all,
We are having this weird behavior when running query through web based interface, we get a lot of "SQL*Net more data from client" waits, the OEM indicates that the current wait event is SQL*Net more data from client
It's just a very simple query wich invokes a db link.
When I execute the same query on any PL/SQL tool like toad or sql developer it works fine, but that query inside an application executed through a web based interface, it hangs for ever.
Where can I start looking for the problem.
We are working on a 3 Node RAC 11gr2, both databases are on the same RAC.
Thanks.Hi ,
we managed to reproduce the case in test environment, below are the steps:
1)have 2 databases on different machines, will call the first one local, the other one remote.
2)in the local database create:
a - DBLink to remote database.
b - read data from remote database(we simply used select count(*) from dummy_table )
c - insert data into a table on the local database
d - terminate the connection between the 2 databases (disconnect either machine from the network)
e - commit on local database.
what we noticed was the following:
1)when the local database is disconnected from the network(the machine is not connected to any network at the moment): almost immediately throws an error, and issuing the following:
select * from dba_2pc_pending;we found some data .
2) when the remote database was disconnected(the local database is still connected to the network):
after 7-8 seconds an error is thrown, and issuing the following:
select * from dba_2pc_pending;did not return any data.
since this is pretty similar to our case ,we concluded that it's a network issue.
is this the correct behavior ?
as a temporary solution till the network issue is fixed ,we did the following:
1) changed the call of the remote procedure to calling a local procedure that calls the remote procedure.
2) added pragma autonomous_transaction to the local procedure.
3) at the end of the local procedure rollback the autonomous transaction.
it seems that since the global transaction does not use the DBLink database does not issue a 2PC commit.
this works in my cases since the DBLink is only issed to read data. -
How to configure SQL*Net to survive minor dropouts?
Hi,
We have recently started developing over a VPN to our server. The VPN is not brilliant and we get minor dropouts for a second or so. This is causing SQL*Net to dropout and we need to re-connect and re-start all our Apps (SQL*Plus, Forms Builder, etc).
Is there an SQL*Net setting which can keep the connection open, even if the network drops for 1-2 seconds?
Cheers,
Tim.Yes, a VPN is extremely important. Just as it's the job of DBAs to protect and maintain data, it is the job of a Network Administrator to keep the network functioning correctly. I'd say that having your NAs take care of the VPN problem is paramount to not only solving your issue, but also in keeping your company's infrastructure on-track and maintainable.
P.S. I was an NA in one of my previous lives :(
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