I am trying to execute two scripts at the same time (concurrent) in Oracle SQL Developer. I know we can schedule a job using DBMS_job package and define the job. But is there any other way of doing it using Threads ?
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There is a detail table
There is a summary table
During batch process record is entered in detail table as well as summary table.
The process first checks if record exists in summary table for same group_no and if 'yes' then "updates" the record with the newly added amount (sums it) else inserts a new record
Whereas in the detail table it inserts the record directly
detail table :
group_no doc_no amount
101 doc1 100
101 doc2 200
102 doc3 300
102 doc4 400
summary table :
group_no amount
101 300
102 700
Now if the batch process runs in parallel, (out of many) two different sessions insert same group_no; This is because while sesond session inserts a record, first session inserting the same record (group_no) has not yet committed ; So second session Not knowing that already there is same Group_no (101) inserted, again inserts another record with same group_no rather than summing it.
Can it be solved without using temp table, select for update?
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?
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?
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.
I have a problem. I have created a report that will list out details of checks using Report Builder. I use XML Publisher to register a template for the report. When running the program through concurrent request, the output will come in pdf format but are not in order.I have add 'Order By' statement in my sql scripts in report builder. Its working fine if test in report builder but not in concurrent program.
View 4 Replies View RelatedI have a batch of generated SQL queries to be run.Say around 1000 update statements each updating a different table.Now to save the execution time,is it possible to run it in multiple sessions from a shell script/java .
Like having 100 queries in separate sql file and running all the file's parallel.Only thing that is problematic is if there is any error encountered in any of the queries the whole execution has to be rolled back.
My requirement is to Run 2 instances of forms 11g R2 parallel at a time(means running 2 urls of 2 instances same time). I have tried with installing 2 instances but when i install and configure my 2nd instance then my 1st instance services are shutting down.At a time it is running only one instance services.
And also i have tried with installing 2 Cluster instances of 11g R2 Forms but same thing happening as above.
how to run 2 instances of Forms 11g R2 parallel and also suggest me to install instances in same domain or different domain because with same domain 2 instances it is creating only one config file..so i tried with different domains. Different Config files created but only one instance service is running.
If we have not set parallel degree for a table then we can ( try to ) force parallel execution on a table using a parallel hint Does this 'parallelism' works on the index search in the query as well?
In which situations non-parallel non-partitioned table but parallel index (degree>2) will facilitate a query?
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?
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.
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.
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.
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?
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?
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]....
How can we run concurrent program on SAVE (push button) in oracle forms?
View 3 Replies View RelatedWe are experiencing a problem with SSO causing 2nd or 3rd concurrent Oracle sessions to hang. The Oracle application hangs during loading and the task manager has to be used to close the application.
I have tested logging onto our application servers using SSO and I cannot load more than 3 concurrent Oracle sessions. When I bypass the SSO and logon to the same server I can load more than 20.
Need to find out what the maximum number of concurrent logins are over a period of 1 month. We need to do this as we may need to buy more licences.
View 4 Replies View RelatedI have a query which has 5 unions, each clause of the union takes 1 hr to run and query results come back in 5 hrs, Is there any way I can make these clause to run in parallel?
View 13 Replies View Relatedwe have many tables in Cursor For Loop :
CREATE OR REPLACE PROCEDURE EBILL_BULK_UPDATE_SERVICE(in_cycle VARCHAR2)
AS
v_cnt NUMBER; -----Variable used for checking table is partitioned or not partitioned
CURSOR cur_update -----Cursor defined for Updating EBILL tables for service_id
is
SELECT table_name
, cycle_name
FROM NNP_EBILL_UPDATE
[code]....
As our requirement that Execute Immediate should work for 5 or more tables updation parallely at a time.If one table get completed then it should take next table from loop and then start the code till completion of all tables.
On a tab page should be displayed the result of four indifferent queries, each based on a stored procedure.At the moment, the queries are processed serially, by the statements:
GO_BLOCK('one');
CLEAR_BLOCK(No_Validate);
EXECUTE_QUERY;
GO_BLOCK('two');
CLEAR_BLOCK(No_Validate);
EXECUTE_QUERY;
Is there a way to processes the queries parallel ?
Is it possible to run a single procedure in parallel. (Not looking for multifple, using DBMS_JOB)
I am using Oracle 9i.
I have to truncate two partitions from the same table parallelly at a time.
ALTER TABLE tablename TRUNCATE PARTITION partitioname1;
ALTER TABLE tablename TRUNCATE PARTITION partitioname2;
Huge data is present in each partition.is this possible, means it does not lock table for another alter truncate partition statement?
I am inserting 50 million records into a table MAIL_LOG. I am using the hint /*+ append parallel (MAIL_LOG, 12) */. But for my table degree is 1.
SELECT table_name, degree
FROM user_tables
WHERE table_name = 'MAIL_LOG';
I have following clarifications.
1) What degree I should use.
2) On what basis I have to give the degree.
3) Have we use constant degree all the times.
4) How to check my insert statement is using parallel degree.
5) How to find the degree at session level.
i am trying to export table using datapump in oracle 10g, this expdp takes 5 hours time, so i want use use parallel keyword in expdp,
my question is how should i know number of parallels can i use...?
I have total 8 procedure to run in parallel . and after that my 9th procedure should run.
below is my job submission procedure
create or replace procedure DURATION_ALARM_WEEKLY as
l_job number ;
begin
dbms_job.submit(l_job,'begin ALARMS_WEEKLY_CALL_OUT ; end;');
dbms_job.submit(l_job,'begin ALARMS_WEEKLY_CALL_IN ; end;');
dbms_job.submit(l_job,'begin ALARMS_WEEKLY_DURATIN_OUT ; end;');
[code].......
what is the syntax I have to do in my FINALE procedure . using DBMS_ALERT.REGISTER , DBMS_ALERT.WAITANY .....?
oracle: 10.2.0.5.7...I can get this to work, but not the way the docs seem to say. I am wondering if I am reading the docs wrong or missing something.
The docs seem to say to get a query to run in parallel using an index you use the PARALLEL_INDEX hint. This doesn't seem to work for me. I have to do one of the following
1. change the parallel degree with an alter index, then use the PARALLEL hint (parallel index hint does nothing in this case)
2. use both the parallel_index and parallel hint
Just a general query on parallel query. My customer having 4 cpus and running the database in 11.2.0.3 in AIX 5.3(One is in AIX 6.1). Under which circumstances, we can propose to user parallel query options.
View 2 Replies View RelatedWe have Data Migration for our application coded in PL/SQL. The DB server has 64 Cores available (Solaris 10 OS) however running the migration code written as a function, utilizes very little CPU and CPU utilization is to max 2%. To utilize CPU power available to increase the speed of migration, we are using DBMS_JOB to schedule this function multiple times.
However scheduling the function 10 times, we are seeing that at any moment only 4/5 oracle processes are active and utilizing the CPU and CPU utilization has gone up to 5-6%. The speed of migration is increased but not to a great extend which I feel would work if we could utilize more CPU.
I see a parameter job_queue_processes is set to 10 currently in the database and am planning to increase this (currently to 25 as I don't have exact count of how many other jobs may be running in the database).
