Sessions Processes And Transactions
Nov 20, 2012
Oracle database 11g Expression Edition 11.2.0.2
I want to change the the number of processes to 150 (default is 100) I did this by issuing the below command.
alter system set processes=150 scope=spfile;But why that modified value is not being reflected?
select name, value from v$parameter where name in ('sessions','processes','transactions');
NAME VALUE
-------------------- -----
processes 100
sessions 172
transactions 189
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Dec 28, 2010
Is there any way to tell what processes/sessions were connected to a DB after I get an ORA 20error. As you can see from the query results below, I did hit the max value of processes but I would like to know when it happen and who was connected.
I realize I can up the value, but before I do that I want to see what caused this to happen.
SQL> select * from v$resource_limit where resource_name in ('sessions', 'processes');
RESOURCE_NAME CURRENT_UTILIZATION MAX_UTILIZATION INITIAL_AL
LIMIT_VALU
----------
processes 221 1000 1000
1000
sessions 223 1020 1105
1105
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Sep 24, 2010
how to see for todays transactions in a database's Schema for example, in scott/tiger user.
To See All DML Operations carried out for current day with a single query, Insert,Update, Delete for the tables affected today.
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Jul 22, 2012
I have the following PL/SQL program.
declare
v_amount NUMBER;
v_paymentno INTEGER := &sv_paymentno;
v_playerno INTEGER;
v_payment_date DATE:= SYSDATE;
begin
select 500 into v_amount from dual;
select 44 into v_playerno from dual;
insert into penalties values (v_paymentno, v_playerno, v_payment_date, v_amount);
end;
I forgot to add the commit statement and now I have hung transaction with dirty data with v_paymentno 27. Is there a way to commit or rollback that transaction?
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Jan 31, 2013
We found out an error from alert log of our Oracle 10.2.0.5 DB :
====================================
..
Wed Jan 30 16:45:01 EAT 2013
DISTRIB TRAN bea1.67AA54355C4A74ECDEE0
is local tran 6.42.332492 (hex=06.2a.512cc)
insert pending prepared tran, scn=8151148567799 (hex=769.d6509cf7)
Wed Jan 30 16:45:02 EAT 2013
Errors in file /oradata/sfapdb/bdump/sfapdb_reco_2739.trc:
ORA-24756: transaction does not exist
Wed Jan 30 16:45:02 EAT 2013
Errors in file /oradata/sfapdb/bdump/sfapdb_reco_2739.trc:
ORA-24756: transaction does not exist
..
====================================
There is no useful information from the trace log as shown below:
====================================
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Data Mining and Real Application Testing options
ORACLE_HOME = /ap/oracle10
System name:HP-UX
Node name:scvap2
Release:B.11.23
Version:U
Machine:9000/800
Instance name: sfapdb
Redo thread mounted by this instance: 1
Oracle process number: 18
Unix process pid: 2739, image: oracle@scvap2 (RECO)
*** SERVICE NAME:(SYS$BACKGROUND) 2013-01-30 16:45:01.941
*** SESSION ID:(1749.1) 2013-01-30 16:45:01.941
*** 2013-01-30 16:45:01.940
ERROR, tran=6.42.332492, ose=0:
ORA-24756: transaction does not exist
*** 2013-01-30 16:45:02.059
ERROR, tran=6.42.332492, session#=1, ose=0:
ORA-24756: transaction does not exist
====================================
I also found out there are some records (trans_id = "6.42.332492") in SYS.PENDING_TRANS$/ SYS.PENDING_SESSION$/dba_2pc_pending with "prepare" status.
This transaction is launched from a Weblogic Server via JDBC. Since it is abnormal so I have no choice to force commit/purge this transaction. Is that a bug of Oracle DB ? or Weblogic coding problem ?
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Jun 12, 2012
I have a problem, we have some datas in a table for example 7500 rows in a table name called table1 upto 11:am today. but after 11:25 am i have only 5500 rows. in that table.
the table can be accessed by many users here. we dont know when the delete happended in that table. is there any query to find the transaction log of this particular table.
the deletion should be happended between 11:00 am to 11:30 am. but we have retrieved the data using timestamp query. but we need to know when the query issued and by which user the query has been issued.
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Mar 27, 2012
here
[URL].......
you wrote that
"The serialize transaction isolation level is not supported with distributed transactions."
what is not supported (or example on what is not working properly)?
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Nov 6, 2011
How a DB client session establishes a connection and how it performs any transaction.
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Jan 22, 2013
When a user clicks on Save Button on a form, can we know from sql plus (Oracle) all the related queries (insert/Update etc) for that transaction ??
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Sep 12, 2010
I need to create a report that will show all activity for the day that the report is run. The report will be run or auto-refreshed throughout the day. So, at 10am, 11am, 2pm, 4pm etc. I just need to display quantities received, shipped etc. for that same day. Since the report will not be run at a fixed time, I can't use sysdate - .5 for example.
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May 10, 2013
Im trying to create a trigger to prevent transactions like insert, update and delete based on two conditions:
1) Friday
2) Between 5pm to 8am
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Jan 20, 2011
I need to generate a report by showing the select, insert, update transactions count per day.
I have been use V$SYSSTAT veiw but there is not include my requested data exactly!
[URL]
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Jul 7, 2011
I found this thread, and recently i want to embedded oci in pro*c for distributed transaction reason.
can pro*c deal with distributed transaction? i want to use mts in pro*c .
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Jun 7, 2002
I have problem with my Replication using oracle 9i.It does not push transactions automatically when refresh time comes but it works fine when pushed manually.I have two sites:
1- Master
a-Master group
2- Materialized view site
a- Materialized view group (Asynchronous)
b- Materialized view with refresh occur automatically on future date every 5 minutes
c- refresh type FORCE.
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Jul 16, 2012
I'm able to use Oracle 11g Standard/Enterprise Edition with Atomikos for XA transactions.(XADMS).
My question is Can I Use Oracle DB 11g Express Edition with Atomikos for XA Transactions.
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Nov 2, 2012
I'm running 11.2.0I am looking at tuning a sql statement, and the question was brought up as to the max inserts per transactions in 11g, and if it exceeds 1000.I haven't found a solid answer yet, but I thought that 10g was higher than 1000.
My first thought was to implement a commit loop on every 1000 rows, as that is how things were handled in the past.But I found an article that talks about redo logs and performance and how it's a horrible practice to do the commit loop.
What I haven't found is what is the better methodology in doing this?My scenario could encounter inserts as much as 20,000 at a time.
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Aug 30, 2011
In the program i wrote, posted in this thread I parallelize 340 jobs.
To do this, according to oracle documentation, i set the job_queue_processes parameters to 450. This works fine, all jobs are submitted, but, when i chek the dba_scheduler_job_run_details, i notice that there is a difference between REQ_START_DATE, which is my requested start date, when i enabled my job, and the ACTUAL_START_DATE, which is the date on which Oracle start this process.
And the more i submit job, the more difference between ACTUAL_START_DATE and REQ_START_DATE increase. But for each job, run duration is less than 1second. I check the processes parameter, and it is set to 100. if i have to increase the processes parameter to 450 too ?
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Aug 6, 2010
I have some transactions in my table with date and time.
i want to pass from date, to date and from time , to time as parameter.
when i pass one date and two time parameters, it works fine. but when i try to pass from date and to date (two date parameters) and two time parameters then it does not work accurately.
e.g. i want to pass 05-Aug-2010 and 06-Aug-2010 and time from 08:00:00 and 14:00:00 then it only retrieves data of both dates having only this time range. however i need to get transaction of 05-aug-2010 from 08:00:00 to 06-aug-2010 14:00:00.
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May 23, 2011
There are 2 people on separate machines each executing a transaction through the same form, processed through a when-button-pressed trigger.The first session processed correctly. For the second user, the session seems to have picked up the non-PACKAGE variables of the first session in what was passed through to the data base. Values associated with the 2nd session's PACKAGE-based types appear to have passed through correctly.
Hence, the second user's transaction processed with a combination of values from the two sessions, with the second user's PACKAGE-based variables merged with the first user's non-PACKAGE variables. There is no use of context variables. There are some global values, but none of them are used in this trigger.The values in question, that appear to have passed from the first session to the second, are based on contextual LOV selection: after selecting a transaction type, users are prompted to select from a LoV specific to that type. Value property set "Validate from List=>Yes".
The 2nd session's PACKAGE-based values do not correlate to the non-PACKAGE values, leading us to conclude that the latter values somehow came through from the first session. We are running IAS 10g R2 on Oracle 10gR2 (10.2.0.3).Each user session is created as user logs into the application and hence logically there should not be any overlap between sessions of different users concurrently.
I did have a look at the code and predict nothin wrong with the source code since the system has been in use for a few years now and only occurred a couple of times in last few months. Also one more noticeable thing is that the issue is not reproducible. I would believe somethin goin wrong in the middle tear or with the session management. Are there any known issues in session management in the Forms server Or something?
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Nov 5, 2009
I have a table that cannot be changed with a field called transaction_reference in the transactions table. This field contains any number of some values in a look-up table called codes.
The table codes contains 'AA', 'BB', 'CC'.
A typical transaction_reference field may look like 'CC BB' or 'AA' or 'AA CC' or 'AA CC BB' - any number, any order.My goal is to get a count of records grouped by another field from the transactions table.
Transactions table example:
transaction_id | transaction_reference | family
---------------------------------------------
1 | AA BB | foo
2 | BB CC | bar
3 | BB | hello
4 | AA CC BB | foo
5 | BB AA | bar
So the results should look like:
family | code | count
foo | AA | 2
foo | BB | 2
foo | CC | 1
bar | AA | 1
bar | BB | 2
bar | CC | 1
hello | AA | 0
hello | BB | 1
hello | CC | 0
If the counts of 0 (like the third to last and last line above) don't show up I'm ok with that.I put together an explode function like this one here but I'm really not sure where to go from here. I can split the transaction_reference, but I'm not sure what to compare it to or how.
I realize that a field in the transactions table for AA, BB, and CC would be ideal, but I can't do that... the powers that be won't let me change the table.
for each exploded segment from transaction_reference
look for it in the codes table
if it exists, add 1 to the count
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Jul 28, 2008
I have one question on MVIEWS.....
Where the logs will be logged for all the materialized views transactions (I mean a particular table)?
Is there any Data Dictionary Table were i can find this .
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Nov 9, 2010
I am having a data guard setup done in oracle 10g(10.2.0.4.0) WINDOWS Platform. some of the archive process are locked in primary db side.
PROCESS STATUS LOG_SEQUENCE STAT
-------- ---------- ------------ ----
0 ACTIVE 0 IDLE
1 ACTIVE 804462 IDLE
2 ACTIVE 0 IDLE
3 ACTIVE 0 IDLE
4 ACTIVE 0 IDLE
5 ACTIVE 800011 BUSY
6 ACTIVE 0 IDLE
7 ACTIVE 800009 BUSY
8 ACTIVE 0 IDLE
9 ACTIVE 802335 BUSY
10 ACTIVE 0 IDLE
Shall we kill the locking archive processes? killing archive processes will cause any problem?
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Sep 10, 2012
In PL\SQL program, I am writing information from one table to file. In my current architecture, I am writing the information to approximately 1000 files.
If I put the database write operation in another package and in another method and call this method from my PL\SQL program asychronously, can that increase performance?
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Aug 23, 2012
select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE 11.2.0.2.0 Production
TNS for IBM/AIX RISC System/6000: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - ProductionI got below error on the datases.
ORA-00020: maximum number of processesBased on the suggestion got from previous posts, I did kill some (LOCAL=NO) processes to get myself in. When I looked at the number of processes the number is 150, I changed it to 1000. After a day I got the same error.
ORA-00020: maximum number of processes (1000) exceededI killed processes again to let my self in, bases on the post below, I queried database
ORA-00020: maximum number of processes (%s) exceededHere is the query to find out if there are any processes with out session attached to it.
select spid from v$process where addr not in (select paddr from v$session);Result
SPID
null
35259840
36897866
13369762
[Code]...
To determine the from where greatest number of processes originated
SELECT MACHINE, COUNT(*) FROM V$SESSION GROUP BY MACHINE;Machine Count(*)
2
CAPITAL-D3F0092 1
DQAKDCDKLCSW01 14
desmond 20
DQAKDCDKLCSA01 52
My question is why I am keep getting this? Why do increasing process from 150 to 1000 did not resolve the issue?
What can I do to make sure that I don't get this error again?
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Sep 24, 2012
I am trying to find some way how to tune and optimize the server performance in following situation. There are 100s of sessions inserting records to one table. Sessions are communication threads in java application, each thread is receiving messages that are to be stored in the table. Each message must be commited and then is ACK sent to remove client. Two problems are raising of course - much of ITLs on the table and lots of very small transactions. I can adjust the java application, but cant do much about the design.
I was thinking about some "caching" - if the messages are stored in memory and bulk-inserted to database by single thread the performance would be much higher. However, there would be possible loss of data - the message could be lost from memory cache and client already received ACK.
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Sep 16, 2011
i got this error..
ORA-00020: maximum number of processes (1100) exceeded
my oracle version is 10.2.0.2.0
when i was trying to login to oracle i got :ERROR at line 1: ORA-01012: not logged on
lucky i was having another sqlplus login ..
wht i should do to bring the number of process down without increasing the process value and shuting/restaring down db.
"Usually, when this happens, I want to get connected to the instance, so that I can try to figure out which user is causing the problem. One way to do that is to use the 'ps' command to identify some of the oldest server processes, and kill the 3-5 oldest processes, and then quickly try connecting to the database. Once you're in, you can look at things like V$SESSION to try and determine which user(s) is (are) consuming so many connections, and then go from there."
this is what i got from [URL]....
1.if i am giving ps -ef in OS it will give lot of detail ...
2. in v$session wht i should look for ....
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Jun 9, 2013
I don't know if there is a beginner forum out there for PL SQL, but I cannot find one.I just started taking an Intermediate Oracle course to learn PL SQL. Today is my first day and I just installed Oracle 11g. I was in SQL Plus, tried the edit command. I got the message "wrote file Afiedt.buf" and then it was just a flashing cursor in the line below. I could not type any commands. I just hit the X to close the program.
What could I have done to exit the program with that flashing cursor since I was unable to type anything?
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Jul 8, 2010
We have an oracle db V7.1 running on Open VMS V6.2. Lately we are having problems with oracle processes crashing...When I do a 'show sys' on VMS...I dont see any oracle processes running on it.....It should show 4 oracle processes....The trace is turned off on DB and alert.log has older info...We have another log which says the following
======================================
Wed 19:32:26 NoFLT
Wed 19:32:26 P19: (SendDelays) ORA-01092: (Cnct err, can't get err txt. See Servr Msgs & Codes Manua
Wed 19:32:26 ORA_NAS_PMON, ORA_NAS_LGWR, ORA_NAS_SMON, ORA_NAS_RECO are DEAD
Wed 19:32:26 P19: (GetNumDelaysNotFilled) ORA-03114: (Cnct err, can't get err tx
t. See Servr Msgs & Codes Manua
Wed 19:32:26 10
====================================
one of the drives has lot of errors but not sure how to check those errors....
I tried to restart the server and sometimes it comes backup. I have backups but really like to solve this issue. I know where the control files are located but not sure what would be good point to start this.
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Mar 7, 2013
in my old database 9.2 (on AIX) i see high paging space usage for background processes.
#> svmon -Pg -t 1 |grep Pid ; svmon -Pg -t 10 |grep "N"
Pid Command Inuse Pin Pgsp Virtual 64-bit Mthrd 16MB
2285578 oracle 304609 81552 500909 605395 Y N N
3350676 oracle 304588 81552 500643 605149 Y N N
1794254 oracle 304592 81552 500634 605126 Y N N
[code]....
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Jun 1, 2013
I am using Oracle 11g R2. (11.2.0.3)
I know that in the profiles of the user I can set limit for the number of sessions per database user, using the below command:
alter profile <profile_name> limit sessions_per_user=<required_number>;
I need to set maximum number of processes for the application user so in case they opened too many number of processes on the database they do not block the automated jobs to be run.My questions:
1. set a limit on sessions_per_user is it the same as a limit on processes? 1 proccess= 1 session ? Is there any way to limit the number of processes (not sessions) for a database user?
2. I am using RAC so the number of sessions is per the whole database, while the max number of processes is by instance (not database), so even I set a limit on the number of sessions (above the limit of processes for one of the instances) one instance may face ORA-20 errors, while the max number of sessions did not hit the limit. is there any workaround for this case?
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