SQL * Net questions - which forum?

Does anyone know what forum manages SQL * Net questions?

THX

For general issues, it's probably as good a place to ask as any.

If you have SQL * Net questions that are specific to a particular technology (i.e. how various options of TNS interact with different configurations of CARS), you probably want to ask in the forums dedicated to these products.

Justin

Tags: Database

Similar Questions

I have questions on the use of the commercial license... Which forum should I use to get answers or how I can get in direct contact with adobe?

I have questions on the use of the commercial license... Which forum should I use to get answers or how I can get in direct contact with adobe?

I have my answers! The chat feature did not work well... But I had contact, so everything is good now!

Thanks again!

IPC vs SQL * Net connection

Hi all

My database is currently running on windows 2008 EE 10.2.0.4 (with all service packs). On the same machine, I have several workers (implemented as a windows service) written in c# .net using the latest drivers ODP.NET.
To improve performance, I use PKI connection so that the TCP stack (which is used in the sqlnet connections "regularly") is shorted. I confirmed that ICP is actually currently in use:

H4. Journal of the listener

13-NOV-2009 03:01:34 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0
13-NOV-2009 03:01:34 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0
13-NOV-2009 03:01:34 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0
13-NOV-2009 03:01:35 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0
13-NOV-2009 03:01:35 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0
13-NOV-2009 03:01:35 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0
13-NOV-2009 03:01:35 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0
13-NOV-2009 03:01:35 * (CONNECT_DATA=(SERVER=DEDICATED)(SID=orclwin)(CID=(PROGRAM=C:\Simulation\Agent.exe)(HOST=WIN2008EE)(USER=LOCAL?SERVICE))) * (ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)) * establish * orclwin * 0

However, when I look at the awr report I see sqlnet expected on top:

H4. AWR waits Albums

Top 5 Timed Events                                         Avg %Total
~~~~~~~~~~~~~~~~~~                                        wait   Call
Event                                 Waits    Time (s)   (ms)   Time Wait Class
------------------------------ ------------ ----------- ------ ------ ----------
SQL*Net message to client         3,014,783   5,086,969   1687 ######    Network
SQL*Net more data to client       1,712,644   2,441,249   1425 ######    Network
log file sync                       695,446      75,297    108 ######     Commit
log file parallel write             679,437      33,288     49  916.9 System I/O
db file parallel write               49,057      22,149    452  610.1 System I/O

I read the ticket of Taner Poder [http://blog.tanelpoder.com/2008/02/07/sqlnet-message-to-client-wait-gotcha/] about SQNet message to the customer
and his other observations on the SQLNet more data to the client [http://blog.tanelpoder.com/2008/02/10/sqlnet-message-to-client-vs-sqlnet-more-data-to-client/]
to get the best understanding of them.

The question is why observe specific SQLNet connection is when you use IPC connections?

I enjoy all the comments.
Thank you
Rafal.

Oh yes - one comment more.

So that the server process indicate if the wait is over TCP/IP or IPC, he needs to know the mechanism of transport used.

It is very likely that the wait event is registered by the server process when it is calling its send() data to the client API. As he calls the send(), it records that the current wait state. He has no idea what the underlying code uses as a transport mechanism. In server code and client, the transport layer is one of the lower layers. So earlier in the application code, you don't know what is the actual transport (remember that Oracle also support, or has supported, other layers of communication such as Lu6.2).

So the application layer, you deal with the transport layer as a bit of a black box. In the Oracle terminology, this is called SQL * Net layer. And may be something that implements the transport layer.

So, this is why it is dangerous to make assumptions that pending top-level State indicates what a low level wait state is.

Wait events, SQL * Net message from client

Hi all
I have a doubt about oracle wait events, specifically of "SQL * Net message from client. I've read a lot about this, I've seen some say that network and other material resources can provoke him, and saw that the problems in the application code can cause it too. I am tracking a few tests here and I don't have that chooses are the double event, usually a lot of SQL * Net message to client waiting (I used sqlplus, developer sql and pl/sql). Can someone explain to me why? Another question is where this wait type cause interference, meet it demand for the database and stays on hold and do not meet another request so that the wait is over, is it? The waiting just finish when the application closes the database connection or there is another way to end the waiting?
Since then, thank you very much.

Hello

chooses double what usually causes a lot of SQL * Net message to client waiting

Do you run them from your server applications or from the DB server itself?

"SQL * Net client message" is an idle wait event although he'd still explain to the elapsed time of the query.

It indicates only that the database is waiting for the other entries of the customer and when he expects the DB, those expectations get incremented.

I suggest you explore size SDU, RECV_BUF_SIZE, and SEND_BUF_SIZE parameters.

http://docs.Oracle.com/CD/B19306_01/network.102/b14212/performance.htm

Kind regards

Suntrupth

Several alter session and SQL * Net message from dblink in APEX

Hello
I have Apex 4.2.3 and I use Glassfish more listener of the Apex.
Database is 11.2.0.4 under linux
Looking for the session active database, I see that apex run several alter session with a lot of expectation as SQL * Net message from dblink the.
Ex:
ALTER session set NLS_TERRITORY = "AMERICA."
call the query of disc elapsed to cpu count current lines
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 58 0.00 0.00 0 0 0 0
Run 58 0.06 3.53 267 58 0 0
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Total 116 0.06 3.53 267 58 0 0
Chess in the library during parsing cache: 0
The analysis of the user id: 277 (recursive depth: 1).
Elapsed time are waiting on the following events:
Event waited on times max wait for the Total WHEREAS
---------------------------------------- Waited ---------- ------------
SQL * Net message to dblink 174 0.00 0.00
SQL * Net message from dblink 174 3.47 0.03
********************************************************************************

Why he is doing a lot to change session? Why the wait is SQL * Net message from dblink the?
We have recently to load a new language, but I'm not sure that this is the main problem.

I think that you have the link db in the workspace schema and data requested by the Apex of this link. For example, it may be

report which uses db link. Check dba_db_links or user_db_links for the existing links. Check if this link used by Apex.

Data is encrypted when you use SQL * Net
Hello

I'm curious to know if the data that is transmitted through SQL * Net is encrypted or clear text - which means that it will be possible for someone read data that is sent from database to log on user or vice versa.

Thank you
SS
I'll change the response of sb92075 to say that the transfer of normal data packets aren't encryped by default however the advanced security option can be used to encrypt all packets of sqlnet.

I also believe that oracle encrypts the password in a package of authentication.

HTH - Mark D Powell.

When the computer starts first to the top, a window titled "run as" the question "which user account do you want to use to run this program?

Original title: which user account you want to use to run this program?

I use a computer that is running Windows XP SP3. Recently, when the computer starts first to the top, a window will appear titled ' run as ' the question "which user account do you want to use to run this program?" with two radio buttons. The default selection is "Current user" and there is a checkbox to "protect my computer and data from unauthorized program activity. The other button is for "the next user. I have to click 'OK' before you can run any programs.

There is only one user on the computer. Why has this window began to appear and can I get rid of him?

Hello

That you recently installed which triggers this popup message initially upwards?

You can try to perform a clean boot and check if it helps.

A clean boot to check if startup item or services to third-party application is causing this issue.

You can read the following article to put the computer in a clean boot:

How to configure Windows XP to start in a "clean boot" State

Note: Make sure that you put the computer to a Normal startup once you have completed troubleshooting.

Lock on a table and SQL * Net more data from client

Hello
I have a problem loading data through Php in Oracle: web page of Php open an xml file, create a .csv, then begins to Oracle using an external table to process the data.
The problem is that, the second time that PHP is trying to run the following query:
INSERT INTO table1 T (Field1, Field2, field3, field4, sphere5, case field6) VALUES ('Aaa1E63819707', SYSDATE, 'KO', 'error', 'L', 'file_name.xml') POLL INTO Field1: id
on the Oracle sessions, I have an exclusive lock on table1 and wait for SQL * Net more data from client.
Where is the problem?
Thank you
Igor

Finally I found the problem: a DBA changed the cursor sharing EXACT force! I restored the CORRECT setting and now everything is fine.

Thank you

Bye,.

Igor

SQL * Net message from client

Hi all
I have a session that runs longer than usual. Instead of filling in 20 minutes, he was running for about 2 hours.
Initial review of show expected that the session was waiting on this SQL * Net client message for a piece of time.
The session state was idle, while the State changed pending work very frequently.
I had activated track and found the bottom of the entries in the trace file.
EXEC #11529215044976967776:c = 0, e = 1944, p = 0, cr = 11, cu = 3, set = 0, r = 0, dep = 0, og = 1, plh is 2651636916, tim = 2309884016239
#11529215044976967776 ERROR: err = 54 tim = 2309884016520

TKProf reports the following
TOTALS FOR ALL NON RECURSIVE INSTRUCTIONS
call the query of disc elapsed to cpu count current lines
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 0 0.00 0.00 0 0 0 0
Run the 884 1.47 1.42 2660 9724 0 0
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
884 total 1.47 1.42 2660 9724 0 0
I need to know what is meant by the error line in the trace file?
We use oracle EBS 11i with 11 GR 2 db. This session belongs to a simultaneous request

Oracle - ORA-00054: resource busy and acquire with NOWAIT specified or expired timeout - Stack Overflow

-------------

Sybrand Bakker

Senior Oracle DBA

SQL * Net more data from client wait event

Hi all
DB 11.2.0.2
AIX 6
I get two events of high expectation of the AWR report page
(1) SQL * Net more data from client
synchronization of log files 2)
Need advice to the configuration of the hardware and network latency?
What should I do for the first event of waiting?

This simple average may, what they're doing massive data loads with a very large table size that the Oracle Server manages very effectively but necessarily expect much coming data of the customer and parallel large log files written to end on the validation. It is possible that setting a large SDU and tcp large transmiat and receive buffers would help if this happens to be what they do; Similarly, if that's what they do, then reduce their size of table can also have some effect.

Concerning

Jonathan Lewis

Fact ' SQL * Net client message' indicate that the network is not good?
The report below 10046 trace, I have just issued a query to extract all records from a table with about 400 K records, but it took more than 3 minutes to recover all data.
Most of the time when waiting for SQL * Net message from client.
This indicates that the network is not good?

SQL ID: d84ta7m8h6wg2
Plan of Hash: 3635621446
Select * from XXXXXXXXXXXXXXXXX

call the query of disc elapsed to cpu count current lines
Parse 1 0.00 0.00 0 0 0 0
Run 1 0.00 0.00 0 0 0 0
Fetch 855 0.88 0.10 0 7912 0 426721
Total 857 0.10-0.88 0 7912 0 426721

Chess in the library during parsing cache: 0
Optimizer mode: ALL_ROWS
The analysis of the user id: 123

Rows Row Source operation
426721 TABLE ACCESS FULL XXXXXXXXXXXXXXX (cr = 7912 pr = 0 pw = time 0 = 467817 u)
s cost = 1847 size = map 46080540 = 415140)

Elapsed time are waiting on the following events:
Event waited on times expected maximum wait the Total WHEREAS

SQL * Net message to client 856 0.00 0.00
SQL * Net client message 856 3.71 179.63
Disk file I/O 1 operations 0.00 0.00
SQL * Net more data to the client 5224 0.37 0.46

Published by: NathanielNie on January 24, 2013 16:40
Run you the same Oracle_Home SQL and Server query as the ETL engine? (Want to use the same libraries and host and network such as ETL).

The large data sets in ETL can be assembled with network optimization. Some of it is on the physical network layer (for example having a dedicated private network or a switched network between the ETL and the DB server), some of them can be found on the configuration settings (arraysize, configuring TCP settings to the OS layer, etc.) or libraries (for example JDBC libraries). Some of them may simply be patches to fix bugs!

Hemant K Collette

Wait for the event begins with SQL * Net message from client-time wait 178577 units
Hello

I'm watching events waiting for a request from long time in TOAD.
I start the query on an instance of TOAD, and open the browser to log on to another instance.
But I am surprised to see that in "TOtal expected" on the RIGHT part->
SQL * Net message from client is the longest time and is already - > 178577 units while I just to start the query.

Considering that, in the current waiting she shows DB file scattered read correctly for a few seconds.

Please suggest.
user8941550 wrote:
Hello. No explanation for this... :-(

Hello

people work here, you don't know?
I think Tom Kyte explains it well enough. This wait event is linked to your session database waiting for the guest to say to do something.

So it is not related to the database, but to your application.
Also as it is a wait of session event you might have had your session inactive for some time (do nothing)

If you want to check the waiting events correctly I suggest using tkprof and start a new session in SQL more as shown by Tom Kyte in the link I posted.

Then, run your query in sqlplus setting track and pull it out as soon as your statement is completed.
that is to say:
```
-- myest.sql
alter session set events '10046 trace name context forever, level 12';
SELECT ... -- your query here
exit
```
Run in sqlplus in this way:
```
sqlplus user/password@db @mytest.sql
```
Then check with tkprof.

Kind regards.
Al

SQL * Net and Auditor job details
Hello

I am aware of SQL * Net and auditor of the concepts.

SQL * Net Treaty of the transmission of data between the client to the server and vice versa.

Listener established the connection between the user and the server process.

I know that on the Oracle server, there are two. ORA files available in the file Admin/network for SQL * Net and the listener.

I am interested in knowing the following things.

(1) in my understanding, process user run the server and not the client.

(2) Please share me the stream used between SQL * Net listener and how the flow occurs.

After the TOAD or SQL * Plus creates connectivity and gets the Session, how they still work.
I understand it, once the connection has been established, even when the listener goes down.
SQL * over the connection to the server remains intact.

Can you please share more fundamental and work know on these two areas, it is not 100% clear to me, thank you.
See the post of Ed - http://edstevensdba.wordpress.com/2011/02/09/sqlnet_overview/

Srini

SQL Tuning questions

Hello

I feel, the hash join subsequently cause performance problem. Please take a look and suggest me that my interpretation is fair or not:

SELECT COUNT(*),d.file_id,d.PRINT_LOCATION,m.corporate_id,m.file_uploaded_on,r.PROCESS_DATE as AuthorizeDate,r.AUTHORIZATION_STATUS,r.AUTHORIZATION_LEVEL as AuthorizationLevel 
FROM CHQPRINT.T_DATA_MASTER_FIELD_DETAILS d,CHQPRINT.T_DATA_CORP_AUTHORIZATION r,CHQPRINT.t_data_file_details m,CHQPRINT.T_DATA_RECORD_DETAILS N 
WHERE d.file_id=r.FILE_ID 
and d.RECORD_REFERENCE_NO=r.RECORD_REFERENCE_NO 
and r.file_id=m.file_id AND N.FILE_ID=R.FILE_ID 
AND N.RECORD_REFERENCE_NO=R.RECORD_REFERENCE_NO 
and d.file_id=m.file_id 
and N.CORPORATE_AUTHORIZATION_DONE='Y' 
AND TO_DATE(m.FILE_UPLOADED_ON) between ('01-OCT-2010') and ('28-OCT-2010') AND(N.PRINTING_STATUS<>'C'  OR N.PRINTING_STATUS IS NULL)
GROUP BY d.file_id,d.PRINT_LOCATION,m.corporate_id,m.file_uploaded_on,r.PROCESS_DATE,r.AUTHORIZATION_STATUS,r.AUTHORIZATION_LEVEL


Plan hash value: 904523798

--------------------------------------------------------------------------------------------------------------------
| Id  | Operation                      | Name                      | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT               |                           |     1 |    80 |       |  5464   (1)| 00:01:06 |
|   1 |  HASH GROUP BY                 |                           |     1 |    80 |       |  5464   (1)| 00:01:06 |
|   2 |   NESTED LOOPS                 |                           |     1 |    80 |       |  5463   (1)| 00:01:06 |
|*  3 |    HASH JOIN                   |                           |    36 |  2340 |  6376K|  5401   (1)| 00:01:05 |
|   4 |     TABLE ACCESS BY INDEX ROWID| T_DATA_CORP_AUTHORIZATION |   408 |  9792 |       |    75   (0)| 00:00:01 |
|   5 |      NESTED LOOPS              |                           |   116K|  5003K|       |  2535   (1)| 00:00:31 |
|*  6 |       TABLE ACCESS FULL        | T_DATA_FILE_DETAILS       |   286 |  5720 |       |   202   (4)| 00:00:03 |
|*  7 |       INDEX RANGE SCAN         | PK_DATA_CORPAUTHORIZATION |   408 |       |       |     6   (0)| 00:00:01 |
|   8 |     INDEX FAST FULL SCAN       | IDX_FILE_REF_PLOC         |   911K|    18M|       |  1120   (1)| 00:00:14 |
|*  9 |    TABLE ACCESS BY INDEX ROWID | T_DATA_RECORD_DETAILS     |     1 |    15 |       |     2   (0)| 00:00:01 |
|* 10 |     INDEX UNIQUE SCAN          | PK_DATA_RECORD_DETAILS    |     1 |       |       |     1   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   3 - access("D"."FILE_ID"="R"."FILE_ID" AND "D"."RECORD_REFERENCE_NO"="R"."RECORD_REFERENCE_NO" AND
              "D"."FILE_ID"="M"."FILE_ID")
   6 - filter(TO_DATE(INTERNAL_FUNCTION("M"."FILE_UPLOADED_ON"))>=TO_DATE('2010-10-01 00:00:00',
              'yyyy-mm-dd hh24:mi:ss') AND TO_DATE(INTERNAL_FUNCTION("M"."FILE_UPLOADED_ON"))<=TO_DATE('2010-10-28
              00:00:00', 'yyyy-mm-dd hh24:mi:ss'))
   7 - access("R"."FILE_ID"="M"."FILE_ID")
   9 - filter(("N"."PRINTING_STATUS" IS NULL OR "N"."PRINTING_STATUS"<>'C') AND
              "N"."CORPORATE_AUTHORIZATION_DONE"='Y')
  10 - access("N"."FILE_ID"="R"."FILE_ID" AND "N"."RECORD_REFERENCE_NO"="R"."RECORD_REFERENCE_NO")

Elapsed: 00:00:08.49

Statistics
----------------------------------------------------------
         22  recursive calls
          0  db block gets
    1149987  consistent gets
        383  physical reads
       1560  redo size
      14528  bytes sent via SQL*Net to client
        679  bytes received via SQL*Net from client
         19  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
        268  rows processed

Database version: 10.2.0.3

Kind regards

Santi says:
Hi Charles,

I made the change in the query according to your suggestion. Here's the amended plan:
(snip)

Even when the cost into account in the new plan is higher than the previous plan of 2000, but I see a big gain to comply:
Elapsed: 00:00:00.64

Statistics
----------------------------------------------------------
22  recursive calls
0  db block gets
27392  consistent gets
0  physical reads
0  redo size
2441  bytes sent via SQL*Net to client
503  bytes received via SQL*Net from client
3  SQL*Net roundtrips to/from client
1  sorts (memory)
0  sorts (disk)
29  rows processed
Kind regards

What you have done is to give Oracle optimizer increases much better estimates of the actual number of rows that will be returned by operations in the execution plan by eliminating the m.FILE_UPLOADED_ON encapsulated TO_DATE function, so the calculated costs are expected to increase when the cardinality estimates. Note that now the T_DATA_FILE_DETAILS table is more should return 286 lines, but instead 1900 lines - 3993 rows being returned. The estimate of cardinaliy is still 2.1 times less than real, but it's better that be 13.96 times weaker than real with a Cartesian join is passed as a nested loops join. The T_DATA_CORP_AUTHORIZATION table is probably the biggest contributor to the execution time in the new execution plan (this may or may not be a performance issue). During the first run he required 10 156 physical block reads (all physical block reads for this run, check that the DB_FILE_MULTIBLOCK_READ_COUNT parameter is disabled to help potentially diluvium read performance in the future). During the second run that no physical reads has been made, then the execution time decreased slightly. 13 309 of the 27 392 makes more sense are a direct consequence of this table T_DATA_CORP_AUTHORIZATION access - we could see the number of becomes compatible drop using an index to access this table, but performance might be harmful if physical block reads are required.

There is a small chance that you could see slightly better performance by using clues more and less full table scan, but I suspect that the performance may not improve much more. You could, of course, test by temporarily adding index indicators to the SQL statement (where the indicator GATHER_PLAN_STATISTICS is currently positioned) to see how changing the performance. Once you are satisfied with the performance of the SQL statement, make sure you remove the indication of the GATHER_PLAN_STATISTICS of the SQL statement.

Charles Hooper
Co-author of "Expert Oracle practices: Oracle Database Administration of the Oak Table.
http://hoopercharles.WordPress.com/
IT Manager/Oracle DBA
K & M-making Machine, Inc.

How to know the size of the files transferred to the SQL * Net?
I'm testing the Advanced compress (AC) for 11 g Data Guard. When the AC is turned on, the archived log files are supposed to be compressed on the primary database server sent via SQL * Net, then unzipped on the standby db server. We will see that the file sizes are the same on the main servers and backup. I want to check that the AC works by monitoring how much data is sent via SQL * Net. By Oracle, AC uses less bandwidth of 35%. This means that the size of the transferred files must be at least 65% of the original size.

Is there a way to know the size with the Oracle utilities? Otherwise, how do you know by the utilities of operating system? OS is Solaris 5.10.

Thank you.
I'm not sure that this can be done via SQL * Net, but a sniffer network between two servers packets must be able to help - you may want to contact your network team.

HTH
Srini

SQL * Net questions - which forum?

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