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

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• 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

• 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

• 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

• How to make a link to send to my website for an elegant form fillable and electronic for several signing sessions and downloads from our Web site?

  How to make a link to send to my website for an elegant form fillable and electronic for several signing sessions and downloads from our Web site?

  Hi stacey1246,

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• ALTER SESSION in sql script produces strange results

  Why "alter session set NLS_DATE_FORMAT" would interfere with the operation of a sql script?
  
  First of all, the script without the ALTER SESSION:

  SQL> !cat doit1.sql
  --alter session set NLS_DATE_FORMAT = "DD-MON-YYYY"
  set pagesize 99
  set trimspool on
  col BIRTH_MONTH for a11
  break on BIRTH_MONTH skip 1
  spo doit.txt
  prompt My Membership
  set feedback off heading off
  select 'As of ' || sysdate from dual;
  set heading on
  --
  select count(*) from dual;
  --
  spool off

  And its execution:

  SQL> @doit1
  My Membership
  
  As of 14-JAN-10
  
    COUNT(*)
  ----------
   1

  Everything is well with the world. Now let's throw in the ALTER SESSION:
  

  SQL> !cat doit2.sql
  alter session set NLS_DATE_FORMAT = "DD-MON-YYYY"
  set pagesize 99
  set trimspool on
  col BIRTH_MONTH for a11
  break on BIRTH_MONTH skip 1
  spo doit.txt
  prompt My Membership
  set feedback off heading off
  select 'As of ' || sysdate from dual;
  set heading on
  --
  select count(*) from dual;
  --
  spool off

  And its performance
  

  SQL> @doit2
  set pagesize 99
  *
  ERROR at line 2:
  ORA-00922: missing or invalid option
  
  
  
    COUNT(*)
  ----------
   1
  not spooling currently
  SQL> 

  Don't like the SET commands (I played a bit with many, he does not like one any of them) and does not take account of the order of the opening COIL
  
  First of all, I've noticed this with a 10.2.0.1 connected to a 10.2.0.4 (windows) client database (HP - UX). Confirmed on my laboratory portable VM, 10.2.0.4 under OEL5, client and db on the same virtual machine.

  You are missing just the leak ';' at the end of the line to alter session. Add to that, it all works.

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• 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:

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  Where is the problem?

  Thank you

  Igor

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