We have a critical application batch that runs daily and had a 7.5 hr window after which the application needs to come online. During the peak batch times the truncates are running very slow leading to slow down of the batch jobs quite considerably due to which the batch is going beyond the window.
The wait events that show up when the truncates are running are local write wait
enq: RO fast object reuse
enq: CR block range reuse ckpt
db file parallel write
The ASH reports show that the top sessions are those executing DMLs(insert, merge, update) and DDLs(Create/alter index & truncate). In addition to this it also shows that the blocking sessions are background wait events: CKPT and DBWR. Changes to DB configuration done with respect to addressing these issues are:
1) We have increased the DBWR processes to 2
2) Reduced the buffer cache size to 20G(from the original 30G)
3) Flushing the buffer cache before the batch begins in order to reduce the load on DBWR during the batch peak time
4) Set the parameter filessytem_io to SETALL(from none)
5) Tuned the EVA(SAN storage) to improve its performance - by distributing the loads evenly between the controllers, reducing the IO transfer block size, etc
6) Suggested using the reuse storage clause to improve truncate performance.
All of these have worked bring a semblance of control but the fact remains that the batch is generating more jobs(hence increasing data volume) over time due to it being the peak season. This causes an inevitable increase in the number of sessions all running DMLs and DDLs which are IO intensive operations.
Suggestions pending from our end:
1) Increase DBWR beyond 2. For this we need a H/W upgrade since we have maxed out the maximum number of DBWR that can be configured
2) Implementing asynchronous IO for DBWR which on HP-UX requires moving to raw disks. Hence have suggested using ASM.
3) Tuning the application to either reduce the IO generated or redistribute the jobs such that those with maximum loads don't run together
instead of truncating tables, can we rename the tables and delete them later . will this improve performance ?
We are having a major issues with the batch run. we are using oracle 11g db. We run the scripts to populate the tables and then call scripts to run the extractions. The issue here each time we run the sql it takes so much inconsistent time.We have created index and run the db stats then run the extractions.The sql sometimes takes 10 minutes or sometimes takes hours to run? This is major show stopper of the project.
identify the latest Critical Patch Update for 10g RAC. My DB server is 10g RAC 2 node cluster running on IBM Aix Pseries servers. The version is 10.2.0.3.
I need to apply this Critical Patch in my databases but I have a doubt about if the component that I find out in the documentation is the component where the fix has to be applied or doesn't matter and I have to apply this fix on all my installations.
CVE# Component
CVE-2012-1740 - Oracle Application Express Listener CVE-2011-3192 - Apache CVE-2012-1737 - Enterprise Manager for Oracle Database CVE-2012-1745 - The vulnerability affects Microsoft Windows platforms only. CVE-2012-1746 - The vulnerability affects Microsoft Windows platforms only. CVE-2012-1747 - The vulnerability affects Microsoft Windows platforms only. CVE-2012-3134 - The vulnerability affects Microsoft Windows platforms only. CVE-2011-4885 - PHP
Just to confirm with you if we can apply the October 2011 Critical Patch Update (CPU) to address vulnerabilities covered from CPU 2007 up to CPU 2011?
The PC Server (staging) where patching will be applied is running under Windows Vista have not been patched since it's database creation. This is maintained by our Contractors.
I need some detail information regarding the CPM Patches released by oracle quarterly.
Is it compulsory to set the CPM patch when it is being realized. How to set or apply this patch. (either by runInstaller or OPatch utility i am not sure about this)
What is the difference between the interim & CPM patches.
We have a DELETE statement when coming from application is not using index but when run from Toad or SQLplus as same user uses index. Explain plan also shows using index.I did a query on v$sql below is the output of the query( I have attached the same as a txt file). All the stats are up to date and confirmed from the developer the variable B1 is using the same datatype as column MAXMKY.
SQL_TEXTSQL_ID DISK_READSOPTIMIZER_HASH_VALUE DELETE LOTA WHERE MAXMKY=:B1 2g2prrp3z56ah19,099,1891,846,735,884 DELETE LOTA WHERE MAXMKY=:B1 2g2prrp3z56ah0 1,846,735,884 OPTIMIZER_COST HASH_VALUEPLAN_HASH_VALUE MODULEPARSING_SCHEMA_NAME
My ERP Application is responding fast while running reports or saving entries, if Oracle 10g Express Edition (XE) is installed. But in Oracle 10g Enterprise Edition or Standard Editions the same application is running very slow.
I am executing multiple PL/SQL files(.sql) with single batch file. The batch file sql.bat has got 3 sub sql sub-tasks to complete once its run. The sql.bat is show below
@Echo off
CD C:Report echo Loadin tables from text file Report.txt sqlplus security/password <c:Reportloader_security.sql echo Creating Security table sqlplus security/password <c:Reportcreating_security_final.sql echo Inserting text file Security table sqlplus security/password <c:Reportinsert_security_final.sql
PAUSE
The sql.bat runs perfectly if I double click on the sql.bat file separately. But if I call the sql.bat from a different batch file 'Final.bat' it throws the below error.
Error ----------- Executing SQL commands and loading file into SQL tables Loadin tables from text file Report.txt Error 6 initializing SQL*Plus SP2-0667: Message file sp1<lang>.msb not found SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory [code].....
The Final.bat file calls other bat files too. It is as show below.
CD C:ReportSecurity echo Merging all Files CALL merge.bat
CD C:ReportSecurity echo Deleting old files CALL del.bat
CD C:ReportSecurity echo Executing SQL commands and loading file into SQL tables CALL sql.bat
Im looking for a query which returns the batch for which all the child should either be in 'A_STATUS','B_STATUS' or 'C_STATUS'. In this query im expecting a query which returns batch 2,3 and 4.
create table batch (batchid number); insert into batch values(1); insert into batch values(2); insert into batch values(3); insert into batch values(4);
I have a .bat file in my client system,which will open a web page after executing(after double clicking on it).I want to execute the same batch file from my pl/sql block.So,after executing my pl/sql block that .bat file should execute,and it should open the same web page.
Name some database tool from which I can check the SQL Queries which my application is running.
NOTE: I do not want to check the queries which I am executing at the SQL command prompt but queries that are being run by my application at the backend.
I have a table which has plenty of rows. In production, I would estimate it to be from 30 millions to 300 millions. I need to update on column (flag) in all the rows (created before certain date).Now saying just:
UPDATE MyTable SET flag = 3 WHERE created < to_date('2010-10-08 23:59:59', 'YY-MM-DD HH24:MI:SS'); COMMIT;
Does not seem like a good idea - the commit-buffer would become too big.I will write a PL/SQL script for this. The question is, whether I should:
a) Update each row separately, and commit after every 10000 rows. ( WHERE RowId = [rowId] ) b) Update 10000 rows with set of dates ( WHERE rowId > [some_row_id] AND RowId < [some_row_id_2]
In the latter example the some_row_ids would naturally be fetched. The rowIds come from sequence. So which one would be more effective?I am not too familiar with PL/SQL or Oracle for that matter.
I'm having an issue with stale optimizer statistics for some SQLs that are run in a batch process. The problem is that the process runs many times during the day - sometimes 20 to 30 times. And each time, the tables are updated, i.e. rows are inserted or deleted, etc.
So eventually the optimizer statistics for those tables become stale and the performance of the SQLs start to slow down (a lot). How best to gather the optimizer stats on the tables so they don't become stale when the batch process runs each time? The problem is that I also can't add/modify the code in the batch process because it is delivered by the vendor as is.
1. Make the jobname distinct, because it keeps giving me multiple entries for each jobname 2. Add the the start_time of SOD_start_data9_UAT1 to end_time fodba_MUAT1 to get the combined duration 3. CONCAT jobnames SOD_start_data9_UAT1 and end_time fodba_MUAT1 4. Generate the last seven days batch run times 5. Generate a report into .csv format and email out 6. I have access to sqlplus and plsql developer
I am trying to create a batch file which will be executed with windows scheduled task. This batch file will have sqlplus script running Oracle query. I can run this query from the command prompt, no problem,
I'm working on a Self assessment project regarding our tax returns. Currently, this is how it works - a return lodged generates a return number, but is batched later. In the change proposed, they want the same process whereby a return is generated still, but at a count of 10 returns generated on the same screen, a batch is to be created and these 10 returns will have to be added to that batch. We are on Oracle 10G and work with Forms, Reports 10G and TOAD/SQL Plus as tools so I was thinking of changing it on Post-Query but suggestions are to add on to System Parameter table.
I want run servral scripts in batch, and I use autorun.bat to call main.sql, which including servral scripts. If there has any pl/sql error in script, then the script will stop to run, but not exit SQL*Plus. If the pl/sql must exit, can it output the error messages in a file?
Please don't use "whenever sqlerror exit|continue...", because it will exit pl*sql tool or continue to run the other sql, it's not easy to know where the error happened
autoRun.sql --------------------------------------------------------------------------- sqlplus "sys/manager@ORADB as sysdba" @main.sql
When i double click .bat file, it will get proper info.But when i call this .bat file thru form, it will show blank screen..why this .bat file not running ?
What could be the reasons that some queries execute fast when executed on sqlplus on server, whereas the same queries run slower with same input values fed from application screen?
One issue I guess would be bind variable peeking while using application whereas executing from sqlplus is causing hard parsing and thus getting rid of "peeking"
If displaying the data on application screen is taking time after data has been fetched, where I can see this delay?
I understand the elapsed time under 'Fetch' in tkprof will show time taken to fetch from database and not the time taken to be displayed in the application GUI
finally how to set arraysize in jdbc to improve performance by reducing roundtrips?
I was just wondering what people's thoughts and experiences are regarding performance of conditional expressions.
Tony blogs about it here
[URL}.........
And gives the example
1) Value of item/column in Expression 1 = Expression 2Expression 1: P1_JOB
Expression 2: SALESMAN
2) PL/SQL Expression
Expression 1: :P1_JOB = ‘SALESMAN’>
Recently I've been trying to eke every shortcut I can with an application and noticed this can be a contributing factor when done dozens of times within a page render.
My application runs a batch procedure weekly once for searching 'A_Text' from a column in Table1 in a clob column in Table2 and inserts accordingly into another Table3.
code snippet is like this -
--- CURSOR cr_sn IS SELECT serial_number
[Code]....
TABLE1 will have at least 1.1 Million rows but not significantly more than this.
This procedure takes 24+ hours to complete. I tried -
1. putting parallel hint ( INSERT /*+ PARALLEL*/INTO Table3)
2. partitioning TABLE2 based on last_update_date and putting a where clause in the above query last_update_date ( last_update_date between date1 and date2)
I run this script through batch file its working.Problem is dump file showing with this format C:dmp_wed.dmp.I want to date format like that C:dmp_18052011.dmp.
for date formatting.How I can add date format in a batch file.
