SQL & PL/SQL :: Contention Between JOB_QUEUE_PROCESSES And Processes
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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Oct 10, 2012
In my current project, I am handling an Oracle database with version 10.2.0.3. I analyzed the AWR report for the past month abd saw the following wait events consistently:
CPU time - 45.6% (% Total Call Time)
db file sequential read - 30.6% (% Total Call Time)
enq: TX - row lock contention - 18.8 % (% Total Call Time)
I have uploaded the report for your reference.What should be my approach to troubleshoot this?
Attached File(s)
awr_report.html ( 382.28K )
Number of downloads: 6
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Jul 26, 2011
I am getting enq: TS - contention as top event in AWR Report.where can i look into database to fix this issue.
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Sep 3, 2012
I have a UPDATE statement which sets values on non-indexes columns and do not use indexed-column in where clause (so every column used in statement are not indexes). Lastly, I had some problem with database and saw in ASH report in TOP SQLs that update with events enq: TX - index contention and buffer busy waits. What does it mean? I read a lot of information about index contention, but always related to INSERT and DELETE. What has UPDATE to do with this contention?
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Oct 22, 2010
We are suffering from very bad application response for last few days, when i try to check and drill down, where the actual contention is? I came to know that there may be contention on data blocks, which may be a prime reason for degraded performance. Herewith i'm pasting my actual stats of gathered from v$waitstat. I gone through some of asktom docs and find that there may be a problem with freelist or segment space management. My data tablespace is segment space management = Manual.
My main question is
1) Should i need to increase freelist value (Right now my value is 1)
2) Or i have to move on segment space management = auto
SQL> select * from v$waitstat;
CLASS COUNT TIME
------------------ ---------- ----------
data block 2022 4052
sort block 0 0
save undo block 0 0
segment header 1 1
save undo header 0 0
free list 0 0
extent map 0 0
1st level bmb 0 0
2nd level bmb 0 0
3rd level bmb 0 0
bitmap block 0 0
bitmap index block 0 0
file header block 0 0
unused 0 0
system undo header 0 0
system undo block 0 0
undo header 6 0
undo block 0 0
18 rows selected.
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Nov 19, 2012
I am having enq: TX - row lock contention in top wait event. it is occurring between 10pm - 2am.
We are having sqlloader job running every one hour(conventional path). But for the specific period of time i am getting "Global Enqueue Services Deadlock detected". Between 10-5. I analyzed related trace file it is make me little confusion.I found there are four insert query culprit for this locking. out of four sql , tow of them are ran by same SID, other two insert ran by same id. I got confused because how same sid locking them self. trace file below. during this period oracle maintenance window is active.
Trace file:
*** 2012-10-09 03:40:31.135
user session for deadlock lock 0x15365e060
sid: 1104 ser: 22256 audsid: 8797820 user: 49/iurth flags: 0x45
pid: 71 O/S info: user: oracle, term: UNKNOWN, ospid: 8601
image: oracle@sgh0909
client details:
[code]....
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Aug 27, 2012
We have occurrences of enq : TX - index contentions in the database. Using the SQL ID, we have identified the INSERT statement and the table which they are trying to insert.
This table has almost 25 different indexes, some of which are unique as well.I am wondering how to identify the actual index causing issue, out of these 25 indexes.
Is there any way to pin point to the name of index which is causing the lock?My plan is, once the index is identified, I would like to check the extents and inittrans and other attributes of this index to fix.
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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$parameter where name in ('sessions','processes','transactions');
NAME VALUE
-------------------- -----
processes 100
sessions 172
transactions 189
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Nov 9, 2010
I am having a data guard setup done in oracle 10g(10.2.0.4.0) WINDOWS Platform. some of the archive process are locked in primary db side.
PROCESS STATUS LOG_SEQUENCE STAT
-------- ---------- ------------ ----
0 ACTIVE 0 IDLE
1 ACTIVE 804462 IDLE
2 ACTIVE 0 IDLE
3 ACTIVE 0 IDLE
4 ACTIVE 0 IDLE
5 ACTIVE 800011 BUSY
6 ACTIVE 0 IDLE
7 ACTIVE 800009 BUSY
8 ACTIVE 0 IDLE
9 ACTIVE 802335 BUSY
10 ACTIVE 0 IDLE
Shall we kill the locking archive processes? killing archive processes will cause any problem?
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Sep 10, 2012
In PL\SQL program, I am writing information from one table to file. In my current architecture, I am writing the information to approximately 1000 files.
If I put the database write operation in another package and in another method and call this method from my PL\SQL program asychronously, can that increase performance?
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Dec 28, 2010
Is there any way to tell what processes/sessions were connected to a DB after I get an ORA 20error. As you can see from the query results below, I did hit the max value of processes but I would like to know when it happen and who was connected.
I realize I can up the value, but before I do that I want to see what caused this to happen.
SQL> select * from v$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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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 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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Dec 9, 2009
We are currently using OCI to connect to Oracle DB using c language. Each process has its own dedicated Connection and Env handle, session handle ...
Right now we decided to use Connection Pooling. In the documentation , Connection pooling examples were using multi-threaded environment. But in our case its multi-process system and we cant modify products architecture to multi-thread.
I would like to know how we can use Connection Pooling on multiple processes.
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May 5, 2013
I have two Oracle databases (test1- 10gr2,test2 - 11gr2) on rhel 5.5. is it possible to find which particular oracle process belongs to which home from OS level. was trying to find which db processes are consuming more resources on my host.
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Jan 22, 2013
I want to install datbase schemas using RCU but it is throwing me an message
"RCU-6083:Failed - Check prerequisites requirement for selected component:WEBCENTER
Please refer to RCU log at C:OracleRCUofm_rcu_win32_11.1.1.2.1_disk1_1of1
cuHome
culoglogdir.2013-01-22_16-03
cu.log for details.
RCU-6107:DB Init Param Prerequisite failure for: PROCESSES
Current Value is 150. It should be greater than or equal to 300."
I tried to change the process using SQL> alter system set processes=300 scope=spfile; and got the msg that system altered but still the error persisit. I reffered to a link RCU-6107, RCU-6092 for the same here it is mentioned in one ofthe post that some user has changed it manually ion init.ora file... Changing manually or through cmd ....
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Mar 11, 2013
oracle 11.2.0.3 I have insert only tables that receive srecords from multiple processes at a rate of about 200/second. Each transaction can have up to 100 records. I have another set of processes that queries this table for the latest data. These processes run anywhere from once a minute to once an hour. Processes do not get all of the data. They get data based on a type field.
Both of these are from java middle tiers. The process that queries data (The subscriber) does so at the request of many remote servers (there will be vast numbers). I am not allowed to expose these downstream databases to the internet (they are not oracle DBs anyway) so I cannot use streams or golden gate
So basicallyInsert Process: multiple sessions that combined insert records up to 200/second. There will be between 1-100 records per commit.
Query Process: Downtream process makes a request to my middle tier. This middle tier runs a query to get the latest data and passes it back. This design is set and I cannot change it.
1. right now we capture the insert time of the record. However, at this rate of inserts some processes will commit faster than others. So I cant use a 'greater than my insert time' query.
2. streams/golden gate won't work. can't register these DBs.
3. don't want to serialize my inserts because since I am not sure I can keep up with the insert rate. I don't even know what the specs will be for the production hardware. I have to actually deliver this before its decided. So I am being conservative.
4. I really want to avoid updates on this table if possible. In part due to my limited ability to test.
5. due to the number of downstream processes it is possible that it will request data and for some reason fail to insert the data locally. So the downstream application will keep track of the latest data it received. This means that a subscriber may need to request the same data again.
Is there a way to set up change data capture with multiple subscribers to handle this? if my subscribers are just queries? All the queries come from the same servers(there will be several, but all the same thing). If so, when I performance test this are there any wait issues I should keep an eye on?
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Aug 9, 2013
To investigate further on this error ,i want to find how many user connections got established during the error time and their details like machine,username,program,status etc in database ?
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Jul 2, 2010
its possible to have multiple LGWR processes for a single database.If its possible how does the multiple processes write from redo log buffer to online redo log file.
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May 4, 2012
is there any view in oracle for getting the total number of processes and currently used process in oracle? i am using oracle 11.2.0.1.0.
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Jan 31, 2013
Getting starting with diving deeper into APEX and reading the developers guide all 800 pages of it! Thing is I'd like to get started with some of the more interesting stuff.
I have created a form page based on the "Form on a Table with Report". The report part looks fine. What I'd like to do now is use an API I've built to change how the insert and update works. So when the submit button is pressed it rather performs an API call to the procedure/function.
1. Should the API be a function or procedure. In my playing around I saw that a procedure might work better or easier to implement
2. How would I go about creating a call for the button to use instead of the current processes?
----------------------------
Apex 4.2
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
Linux version 2.6.32-279.19.1.el6.i686
----------------------------
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Oct 4, 2013
db11gxe and apex 4.0 , difference of the processes in these two columns , what is the diff ? the same "Select the category of the process you wish to create:"? there is no difference i can see ?so what is the diff again ?
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May 23, 2013
Oracle 11g R2 on WIndows 20o8 R2 Standard edition
I have a test server that keeps running into ORA-00020: maximum number of processes error each night. Our current setting is '600' processes to be allowed. There are no users to this database except myself. No front end app connects to it either.
I found that ORACLE.EXE (SHAD) process coming from SYSMAN user is the one eating up all the processes and eventually causing that error.
From v$session, the program is OMS.
From v$process, the hostname is the server itself.
I narrowed it down to restarting the ConsoleService, if i do that, then the number of processes drops down. So now im not sure why something within the ConsoleService is logging in, taking a process and not releasing it...What i can check?
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Jun 20, 2012
we have 96GB Memory on the UNIX server and 85% of its usage shows oracle processes I want to determine which Oracle processes are taking most of the memory
SGA is around 36G
SGA_TARGET is 40G
PGA is around 4G
the total of around 40-45 GB of usage is understandable but what other oracle process are chewing up the remaining 30-40 GB on the server is not known
load averages: 7.35, 6.46, 6.15; up 248+11:33:21 12:25:03
2202 processes: 2196 sleeping, 1 zombie, 5 on cpu
CPU states: 83.8% idle, 10.5% user, 5.8% kernel, 0.0% iowait, 0.0% swap
Memory: 96G phys mem, 15G free mem, 128G total swap, 128G free swap
PID USERNAME LWP PRI NICE SIZE RES STATE TIME CPU COMMAND
21720 oracle 258 0 0 40G 40G cpu/48 215:28 2.04% oracle
10709 oracle 1 0 2 1816K 1448K cpu/9 0:02 0.90% res_conf_email_
[code]......
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Jul 2, 2013
We have an application that has "After Submit" and AJAX "On-Demand" processes. We need the "After Submit" to fire and complete first, set an application item (by referencing the next value in a sequence), and then fire the "On-Demand" processes. We have the sequence number set accordingly, with all of the "After Submit" processes given a lower (APEX) sequence number than the "On-Demand" processes; however, it seems the "After Submit" processes are still not firing and completing because only intermittently are the "On-Demand" processes able to access the application item's value--80% of the time this value is simply blank. Making matters more complicated is that the application item is derived from an Oracle sequence, so in my "On-Demand" processes, I cannot simply re-run some of the same logic used in one of the "After Submit" processes that sets the sequence--the sequence may only be set once, and only by this "After Submit" process; we have no choice in that regard. Is there any way possible in APEX to 100% force processes to fire AND complete, one after another, in the order in which they are listed by their (APEX) sequence? In other words, if we have this:
(APEX) Seq Name & Process Type
1 process A ("After Submit")
2 process B ("After Submit")--this sets application item :XYZ
3 process C ("On-Demand)--this uses application item :XYZ and MUST have this item value available to do any processing Can we instruct APEX to fire process A, complete it, fire process B, complete it, and only then, fire process C?
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Dec 25, 2007
i want to get table name, constraint name, constraint type with join processes in string type. this is what i want: alter table tablename add constraint constraintname constrainttype(columnname)
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