Running Concurrent Request Permanently
Oct 8, 2010
having a concurrent request that is always up?
As part of an interface I've implemented, I have a 'listener' concurrent request that registers for a dbms_alert and uses wait_one to detect appropriate alerts. When an alert has been detected, a loader concurrent request is kicked-off, before the listener loops back to the wait_one call. I've set a nominal wait_one timeout period of ten minutes. It is not envisaged that many alerts will be raised - maybe several a day at the moment, but I am always reluctant to use polling unless I can avoid it.
Our EBS system has gradually ground to a halt after the release of this program, and the DBAs suspect this as a possible cause. CPU usage was very high overall, with various java-related usage figure also being high.
The overall idea is to have a 'poor-mans' equivalent of OAI, so I'd hope to add more listeners, with each being the equivalent of an OAI adapter.
Surely a big powerful thing like Oracle EBS is not going to keel over just because of a few processes doing little more than waiting for alerts?
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Oct 9, 2012
I have a stored procedure that is run from a command within our Clarity application.
The procedure involves some SQL Reads and SQL Inserts.
We have experienced users running the SP at the same time (slim chance to do this) and it creating duplicate entries.
if there is a clever way of preventing the same SP to be run concurrently?
Initially I was thinking of having the first step of the SP to interrogate a flag into a custom table - which the SP then sets to 1 if it is running, and 0 at the end.
Are there better more efficient/effective ways of doing this?
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Oct 26, 2010
My requirement is:
I want to run multiple Reports Concurrently, being called from my Form.
Suppose I have 10 Reports Say Report1, Report2, ....Report10.
I am using "RUN_PRODUCT" to call these Reports from my Form. But it's taking too long time to run all the Reports one after another. Can I run all these Reports Concurrently at the Same time.
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Apr 18, 2013
You have a stock_amt value in one table and there is a procedure that updates and substracts from this stock_amt.
lets say in a store a have a stock amount of 50 items and this procedure, for each sale is subtracting from this value and it is not allowed to go below zero. The process, beside the update, on this column (set stock_amt = stock_amt - x) is doing a lot of other updates on other tables and it total it takes like 0.5 seconds. Everything is fine till I want to execute this procedure by 50 users in parallel.
The initial implementation, to avoid some dead locks and we put a lock on that column (stock_amt) but there where to much waits. we cannot hold that lock for 0.5 seconds.
What will be the best approach for this? For this stock amt problem, maybe the solution can be a trade like: do not update that column every time but once in a while, by another process or by a materialize view logic.
but what if my column is a critical value like a Prepay balance or bank balance and it needs to be updated in near real time. What will you do?
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Oct 24, 2013
I have a context package that uses a session_id.
I want to use multiple sessions as I will have multiple users creating contexts at the same time.
Once the context is created with a session_id I want to reference that session_id in a view.
Can this be done? Using Oracle 10g R2 Context:
-- create ctxCREATE OR REPLACE CONTEXT MY_CTX USING CTX_PKG ACCESSED GLOBALLY; -- ctx package CREATE OR REPLACE PACKAGE CTX_PKG IS PROCEDURE SET_SESSION_ID (IN_SESSION_ID VARCHAR2); PROCEDURE CLEAR_SESSION (IN_SESSION_ID VARCHAR2); PROCEDURE SET_CONTEXT(IN_NAME VARCHAR2, IN_VALUE VARCHAR2); END CTX_PKG; -- context packatge CREATE OR REPLACE PACKAGE BODY CTX_PKG IS GC$SESSION_ID VARCHAR2 (100); PROCEDURE SET_SESSION_ID (IN_SESSION_ID VARCHAR2) IS BEGIN GC$SESSION_ID := IN_SESSION_ID;
[Code]...
The first query returns valoc but the second query doesn't return the session_id.
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Oct 3, 2012
I'm using the below code in SQL Developer, trying to submit a request:
Declare
vRequest_id NUMBER;
BEGIN
Fnd_Global.apps_initialize(9205,20639,200);
[code]...
However, when i check the fnd_concurent_request table, nothing is there.as I just used the following code in SQL Developer and it worked:
Declare
L_NUMBER number;
BEGIN
L_NUMBER := WF_ROLE_HIERARCHY.AddRelationship('UMX|XXR|GLFSA_RADG_BA','FND_RESP|SQLAP|XXR_GL_JNL_ADMIN|STANDARD');
END;
Is it due to the different types of packages im using? i.e. public/private? or is there an api i can use in SQL Developer to submit the request?
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Aug 16, 2012
User clicks on link-column field in tablular form, Confirm box pops up with a confirmation message, with "OK" generates a request and should pass a value from the form into an item for further processing.
The URL in the column link as of now looks like that: javascript: apex.confirm("message goes here...", {request:"EQDONE", set:{"P2100_X": "#EQMID#"}});For some reason just nothing happens. When I omit the "javascript:", I get an unvalid-url error message. But if I change the procedure name, shoudln't I get some error message also?
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Nov 5, 2012
We have an application with database Oracle 10g.
I want to add a new validation to restrict concurrent user and/or session from a client. (we have almost 60 client firms using the software to enter daily trasnactions). All users from all clients are connecting to the database using a common functional ID.
What I did was:
1) Add a column 'user_logged_in' in the master table for client and update it as Y when user from that client logged on to the system,
2) Insert the application logon details (we can figure out the client details from this) into a global temp table,
3) Create a logoff trigger to update the 'user_logged_in'flag in client master table by using values from global temp table when session logged off and
4) Restrict the users from same client if the flag is 'Y'
But the problem in this case is logoff trigger will not be executed in case if the session got killed or terminated abnormally.
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Feb 4, 2013
I am facing Deadlock issue in my transaction when record is been deleted in the same table in parallel from a PLSQL package. The package is been called from the Java code.The example and the table structure is given below.
Col1 of tab1 is foreign key to col1 of tab2.
Commit will not be done until all the below dml scripts are executed in both environment.
1st session:
Delete from tab1 where col1=1001;
Delete from tab2 where col1=2001;
Result: Deletion successful
2nd session:
Delete from tab1 where col1=1002;
Delete from tab2 where col1=2002;
Result: Deletion successful
1st session:
Delete from tab1 where col1=1003;
Delete from tab2 where col1=2003;
Result: Deletion successful
2nd session:
Delete from tab1 where col1=1004;
Delete from tab2 where col1=2004;
Result: Query is executing for a longer time.
1st session:
Delete from tab1 where col1=1003;
Delete from tab2 where col1=2003;
Result: Query is not executed and throws Deadlock in the back end.
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Mar 29, 2011
I tried a Data Guard setup on Oracle Databases (version 10.2.0.4.0, on RHEL)
Primary Database is db5
Standby Database is db6
By the time I created standby database, 3 archivelogs (sequence 11,12,13) were generated on primary which I copied over to standby database server
Now while querying v$archive_gap on the primary database these archivelogs aren't listed
However at the same time querying v$archived_log on either Primary or Standby Database also does not list them
1)
In such case do I need to register these archivelogs on standby database?
Or else do I catalog these archivelogs on standby database?
Also as soon as standby database is started in recovery mode as a part of setup, 1 archivelog (sequence 14) was shown on standby
Now this archivelog has different path than the archivelogs generated later (sequence 15, 16)and v$archived_log shows it is generated as a part of FAL request (FAL=YES)
Question are
1) why it was FALed while redo apply services were active?
2) why this particular archivelog only which is part of FAL request is generated at different location
Does it generate at standby_archive_dest rather than FRA when FAL=YES?
3) why subsequent archivelogs are not part of FAL request or FAL request wasn't needed for subsequent archivelogs?
Primary database init parameters
*.db_name='db5'
*.db_unique_name='db5'
[Code]....
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Nov 15, 2011
We are designing a three tiered system (client, application/web server, database server) that will allow clients through a web interface to select a text file from the operating system and load that file into a intermediate table (import database table). Many users will do this concurrently and data will load into a single table. The text files come in monthly for about 100 firms. No user is able to insert or update the data of another users data (there is a check out system). Their are about 30 to 40 users that will be using the system doing various functions but it is possible for 10 to 20 users to import data at one time. The files can have anywhere from 2000 to 25000 records at a record length of 398.I am concerned about having a good design strategy as well as decent performance.
Problems with each of the Oracle loaders.
1) External tables - Can not read data text files on the application server(which is where they want the text files to go) secondly you cannot create a instance of a external table. Multiple users will be using the external table to point to different text files and loading at the same time.
2) Sqlloader - is mainly a OS level tool and I am not sure how I could programatically point it to a different text file each time a user wants to load. The client will have to have the ability through code to point sqlloader to the correct file name.
I had a creative approach and was wondering if this would work. I would like to use external tables just like a connection pool. I would propose first a scheduled OS job to move files to the database server. I would create about 20 external tables with 20 different directory objects. Using a stored procedure for the user to call and pass in file name and audit info as needed. I would use a Load lock pool table (my invention) to load the name or a code for the external table in use. The procedure loads this code into my load lock pool table when a external table is in use and deletes the name when the load is completed. The procedure would check through a series of if statements whether a particular external table was in use. If in use (exist in load lock pool table) I would check the next available external table until a external table not in use is encountered. Now potentially 20 users at one time but not likely would be laoding into the same table at one time.My questions
1) Could Oracle handle this strategy? What do I need to consider performance wise with the possibility of so many users loading into a single table at one time?
2) Do any of you maybe have another strategy to do this?
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Feb 5, 2011
I have a table with counter value which will be incremented or decremented by several application servers.
SQL> select * from test;
COUNTER
----------
10
Application servers(multiple servers) will be running update against this row for increasing the counter value or decreasing the counter value.
update test set counter=counter+1;
update test set counter=counter-1;
update test set counter=counter+1;
update test set counter=counter+1;
So when update happens concurrently to this table will the counter value gets messed up?
I did a small test by opening multiple sessions for running update and the result I got for above update statement was 11,10,11,12.
But our developer is bit skeptical about this approach and he is using select for update and then updating the row.
Which approach will be better?
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Apr 27, 2010
I have a requirement to calculate the maximum number of concurrent calls from the following data:
Create_date connect_date_time disconnect_date_time duration ...
12/01/10 13:20:26 1263253551 1263254153 602
...
I have attempted to use the analytic function to keep a running total of the count of active calls based on the connect and disconnect times given for each record row.
e.g.
SELECT
count(*) calls,
avg(duration)/60 average_duration_mins,
max(duration)/60 max_duration_mins,
sum(duration)/60 total_mins,
(SUM(DURATION)/60)*0.04 total_cost_4c_per_min
[code]....
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Mar 18, 2010
I am using Oracle 10.2.0.1.0. My intention is to create a new database instance.
Here are the steps I have taken,
1. Using DBCA, I created a new database instance, oracle sid = MYORCL0318
2. I created the tablespaces for this instance.(I obviously have not imported any data into this database yet.)
then, I went to Enterprise Manager,
Login = sys
password = xxxxxxx
role = SYSDBA
After I login, I would get an Error like this
java.lang.Exception: Exception in sending Request :: null
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Mar 11, 2013
We are getting the following error when trying to access a RESTful web service coming from Apex workspace 4.2.1 and Apex listener 2.1:
ORA-29273: HTTP request failed ORA-06512: at "SYS.UTL_HTTP", line 1130 ORA-29024: Certificate validation failure
In the Debug report, besides the above I also see:
error_backtrace: ORA-06512: at "SYS.UTL_HTTP", line 1130 ORA-06512: at "APEX_040200.WWV_FLOW_WEB_SERVICES", line 543 ORA-06512: at "APEX_040200.WWV_FLOW_WEB_SERVICES", line 1164 ORA-06512: at "APEX_040200.WWV_FLOW_PROCESS", line 396
We get that error whether we use https or http in the URI pointing to the web service. When I test the Web Service in Workspace RESTful service GUI, I get the data back. When I go build an application with a report calling the RESTful Web Service I get that error. Both the Application and the Workspace RESTful services are on the same Apex environment and even the same workspace.
What is odd is that I can actually put the URL of the web service into a browser and I get the data: (using the demo hr data in sample RESTful services.)IN browser-- [URL]
yields:
7839,KING,PRESIDENT,,1981-11-17T05:00:00Z,5000,,10 7698,BLAKE,MANAGER,7839,1981-05-01T04:00:00Z,2850,,30 7782,CLARK,MANAGER,7839,1981-06-09T04:00:00Z,2450,,10 7566,JONES,MANAGER,7839,1981-04-02T05:00:00Z,2975,,20 7788,SCOTT,ANALYST,7566,1982-12-09T05:00:00Z,3000,,20 7902,FORD,ANALYST,7566,1981-12-03T05:00:00Z,3000,,20 7369,SMITH,CLERK,7902,1980-12-17T05:00:00Z,800,,20 7499,ALLEN,SALESMAN,7698,1981-02-20T05:00:00Z,1600,300,30 7521,WARD,SALESMAN,7698,1981-02-22T05:00:00Z,1250,500,30 7654,MARTIN,SALESMAN,7698,1981-09-28T04:00:00Z,1250,1400,30 7844,TURNER,SALESMAN,7698,1981-09-08T04:00:00Z,1500,0,30 7876,ADAMS,CLERK,7788,1983-01-12T05:00:00Z,1100,,20 7900,JAMES,CLERK,7698,1981-12-03T05:00:00Z,950,,30 7934,MILLER,CLERK,7782,1982-01-23T05:00:00Z,1300,,10
what would be causing the Error above in our application?
In reviewing the above error, I think we are realizing that we have to have the Weblogic layer SSL cert (actually the CERT from our BigIP load balancer which also does our SSL termination) imported into the Oracle server wallet where Apex is installed. Am I correct?
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Jul 8, 2009
I have the following tables:
REQUEST
----------------------
request_id
item_name
unit_of_measure
UOM_CODES_TL ("tl" means translation - this table has the same record 3 times, once for English, once for Spanish, and one for France)
----------------------
unit_of_measure
description
language
[code]....
So what I'm trying to do with the outer join ((+)) is to get the request record, regardless of whether the r.unit_of_measure is null. That works as long as I don't include the underlined portion above. As soon as I do that it only returns results where r.unit_of_measure is not null. That all makes sense to me, but I'm wondering how I can restrict the values to English without requiring that a value exist in the request table.
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Apr 29, 2010
Just installed ORacle 10gR2 in Win7 64bits and when I login to the EM, I get the error:java.lang.Exception: Exception in sending Request :: null
I have a loopback adapter correctly configured and already added my TMZ to emd.properties
C:JavaoracleBIN>emctl status agent
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
---------------------------------------------------------------
Agent Version : 10.1.0.4.1
[code]...
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