Performance Tuning :: Oracle Documentation On Details Of AWR Report

Jun 4, 2012

A coworker of mine asked if there was any documentation from Oracle that listed all of the parts of the AWR report and what each meant. I was taken back because I don't think there is. There are third party books that talk about AWR reports and their predecessor Statspack reports.

Oracle has some notes on their support site about reading an AWR or Statspack report. All I found in the official documentation was some basic information about how to run an AWR report and an overview of what it was. It would be nice to have some sort of documentation that lists out each section and explains the units and purpose.

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Performance Tuning :: AWR Report Evaluation

May 20, 2010

My DB is oracle10g.

I have AWR report comparison for two different days. I want to find the below things.

1. Which day has better performance?
2. What are the top two findings on the report.

I attached the report.

Here are my answer. Please correct me if i am wrong.

1. Which day has better performance? Second day has higher load. Since redosize is showing very high.
2. What are the top two findings on the report.

a) Compared to two days, first day, little bit more I/0 wait for single block read.
b) Compared to two days, 2nd day, it takes higher CPU.

However, which day is best compared to two days?

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Performance Tuning :: No Snapshot Available For AWR Report

Feb 1, 2011

I am trying to generate AWR report for database observation. But I am not getting any snapshot listed there. below is the output of my awrrpt.sql

SQL> @?/rdbms/admin/awrrpt.sql

Current Instance
~~~~~~~~~~~~~~~~
DB Id DB Name Inst Num Instance
----------- ------------ -------- ------------
1140984076 AFCCV 1 afccv

Specify the Report Type
~~~~~~~~~~~~~~~~~~~~~~~
Would you like an HTML report, or a plain text report?

Enter 'html' for an HTML report, or 'text' for plain text Defaults to 'html'

Enter value for report_type: html

Type Specified: html

Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DB Id Inst Num DB Name Instance Host
------------ -------- ------------ ------------ ------------
* 1140984076 1 AFCCV afccv SERVICEDB1

Using 1140984076 for database Id
Using 1 for instance number

Specify the number of days of snapshots to choose from
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Entering the number of days (n) will result in the most recent (n) days of snapshots being listed. Pressing <return> without specifying a number lists all completed snapshots.

Enter value for num_days: 3

Listing the last 3 days of Completed Snapshots

Specify the Begin and End Snapshot Ids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter value for begin_snap:

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Performance Tuning :: Get AWR Report Data?

Aug 8, 2012

I am having only select_catalog_role in database. Can I take complete AWR report data from awr views without using DBMS_WORKLOAD_REPOSITORY package?

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Performance Tuning :: Time Calculation In AWR Report

Dec 12, 2011

Till statspack we had

elapsed time = time spent on waits + time CPU was used

Total time during snaps = Elapsed time + (may be) time waited for CPU...In AWR is it possible to draw such equation? I can see that the AWR report has following elements

1) End Snap time - Begin Snap time
2) DB time - as mentioned at the top of AWR report
3) DB CPU - in "Top 5 Timed Foreground Events" (I assume this is 'CPU used by sesson timing' in statspack)
4) Total of time for all Statistics in "Time Model Statistics"
5) BUSY_TIME + IDLE_TIME - "Operating System Statistics"

Time between 2 snapshots? or what else? Also for which seconds to multiply to 'DB Time(s)' per second and 'DB CPU(s)' per second in Load Profile to get the db time and CPU time?

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Performance Tuning :: Generate HTML AWR Report?

Jan 10, 2012

I would like to generate HTML awr report and save it to my local machine.

After running $ORACLE_HOME/rdbms/admin/awrrpt.sql in sqlplus and specifying HTML in (Enter value for report_type: HTML) i hvae get numerous html code in my sqlplus prompt.. I want to save the html report in local machine and open it by double clicking on it.. it will be opened in a browser..

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Performance Tuning :: AWR Report In 11g Standard Not Supported?

Jan 15, 2011

I was trying to generate AWR report, but the report which got generated consist most of the sections without data. Later i came to know that AWR report is not fully supported in 11g? Is that true?

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Performance Tuning :: AWR Report For Specific Date

Jun 4, 2010

I want to take AWR report at specific date ex(25-05-2010).

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Performance Tuning :: Database Time In AWR Report

Jul 9, 2012

I understand that when data is read from the disk, I/O is done..And When computations are done then CPU is used..Then where the following equation fits?

DB Time = sum of database CPU time + waits

Is I/O considered as a part of CPU time?

Does this equation changes with SAN, OS caching?

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Performance Tuning :: How To Read And Understand AWR Report

Sep 9, 2011

One of my procedure recently taking very long time to execute. I'm attaching AWR report. But I don't know how to read and understand this.

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Performance Tuning :: AWR Report - Find Disk I/O

Mar 11, 2012

In AWR report, in order to find the disk i/o, Should I see the avg read(ms) under Tablespace I/O and Filesystem I/O columns?

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Performance Tuning :: AWR Report Generation For Short Duration

Nov 5, 2012

Is it possible to generate AWR report for the duration of 5 min? As we know that snapshots are generated for every 1 hour, which we specified in parameter.

By changing the parameter to 2 min, what could be the impact on database?

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Performance Tuning :: Application (software / Utility) For Report?

Jul 28, 2010

Now, I'm tired to capture one-by-part image, and realize.

I've not seen any application or utility to make this work easier to me.

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Performance Tuning :: ASH Report - SQL Has Been Executed For 1567 Times?

Sep 12, 2012

In ASH report

there is a section that goes like this

SQL ID Planhashed Sampled # of Executions % ActivityEvent% Event Top Row Source
fdy93qpr1227 1567 7.58direct path read 3.65TABLE ACCESS - FULL

does it suggest that this SQL has been executed for 1567 times is this correct .

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Performance Tuning :: AWR Report Network Foreground Wait Events?

Jun 29, 2011

I ran an AWR report. The database looks fine, but a data load that loaded 1 Million rows an hour is now doing 500K per hour.

Wait Class Waits %Time -outs Total Wait Time (s) Avg wait (ms) %DB time
DB CPU 224 80.70
Other 2,668 0 28 10 9.99
System I/O 4,753 0 9 2 3.23
Administrative 1 0 6 5543 2.00
Commit 357 0 4 11 1.46

[code]....

The network value for wait: 630,601. What does this mean? Anything I should look at? When it was 1million per hour, the value was 4,563,000.

Top 5 Timed Foreground Events

Event Waits Time(s) Avg wait (ms) % DB time Wait Class
DB CPU 224 80.70
unspecified wait event 2,666 28 10 9.99 Other
control file sequential read 4,753 9 2 3.23 System I/O
switch logfile command 1 6 5543 2.00 Administrative
log file sync 357 4 11 1.46 Commit

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Performance Tuning :: Difference Between System / User Sql In Tkprof Report?

Jun 11, 2010

How can i differentiate between system issued sql's and user issued sql's in the tkprof report ?

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Performance Tuning :: Top Wait Events - Specific Document To Analyze AWR Report

Jun 24, 2013

We are using 11.2.0.3.0 on solaris 10 facing slow performance, following are the Wait Events in AWR report, Also if any specific document to analyze AWR report and to pin point the performance bottleneck.

Foreground Wait Events
**********************
Avg
%Time Total Wait wait Waits % DB
Event Waits -outs Time (s) (ms) /txn time
-------------------------- ------------ ----- ---------- ------- -------- ------
direct path read 308,729 0 21,191 69 58.0 39.5
db file sequential read 208,754 0 3,742 18 39.2 7.0
cursor: pin S 19,541,899 0 2,561 0 3,668.5 4.8
[code]....

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SQL Query Details In AWR Report?

Aug 30, 2012

In AWR Report i found that there are few SQL queries that have full table scans how can we drill about this and find which table have full scan

yes with Explain plan we can do this but is there any other way in Oracle 11g

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SQL & PL/SQL :: How To Read Oracle Diagram In The Documentation

Feb 8, 2010

How to read oracle diagram in the documentation?

legend etc.

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SQL & PL/SQL :: Search Documentation In Oracle With Keyword (Top-N)?

Feb 12, 2011

I have questions on Top N.Before post this thread, I have read these: One select in TOP Na thread very similar with my problem

Search the documentation in Oracle with key word "Top-N", but what I mostly got is about: "Top-N Frequency Categorical Binning"

SQL> select ename, sal
2 from emp
3 where sal in
4 (
5 select distinct sal

[code]...

Actually, I am not missing parenthesis, and I can not see any syntax error.what does the issue occur?

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Oracle Documentation To Migrate RAC To NON-RAC Keeping ASM

Aug 29, 2013

Oracle Documentation to Migrate RAC to NON-RAC keeping ASM.

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Download Full Oracle 10gR2 Documentation?

Nov 3, 2010

want to download full oracle 10gR2 documentation. I also navigated on [URL] but this link allowing me to download pdf one by one but I want to download all pdf's in single shot.

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Reports & Discoverer :: Created A Report To Generate Details Of Officials

Dec 4, 2010

we have a admin wizard where in there are 850 officials whose details are like

emp id
date of birth
date of joining
basic pay
photo
etc........

i have the photos of the officials out of the data base.i have created a report to generate the details of the officials. what i would like to have is to get the photo of each official from the file which is not in the data base.

i have the command in pre_form read_image_file('path where the photos are','msg.mcn');

this gives the same photo to all the officials. how do i be able to link the photos to their emp id and get it.

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Performance Tuning :: How To Enable AWR In Oracle 10g

Jul 12, 2013

I have installed database in one server. I would like to enable AWR into it. Statistics_level is set to Typical. While running the below script to enable the AWR, its gives error -

SQL> exec dbms_scheduler.enable('GATHER_STATS_JOBS');
BEGIN dbms_scheduler.enable('GATHER_STATS_JOBS'); END;

*
ERROR at line 1:
ORA-27476: "SYS.GATHER_STATS_JOBS" does not exist
ORA-06512: at "SYS.DBMS_ISCHED", line 4343
ORA-06512: at "SYS.DBMS_SCHEDULER", line 2802
ORA-06512: at line 1

make AWR automatical generation.

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Performance Tuning :: Oracle 10.2.0.3 On Solaris 5.9 OS?

Aug 28, 2012

I am running an Oracle 10.2.0.3 on Solaris 5.9 OS. Front end appplication is PeopleSoft v8.8.From my AWR report I have found below SQL which needs to be tuned:

SELECT TO_CHAR (TO_DATE (TO_CHAR (B.ASOFDATE, 'YYYY-MM-DD'), 'yyyy-mm-dd'),
'dd/mm/yyyy'),
B.EMPLID,
B.PWCUK_LEGACY_ID,
B.NAME,

[code]...

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Performance Tuning :: Tools For Database Tuning And Instance Tuning

Jul 12, 2010

Looking to understand the difference between instance tuning and database tuning.

What is the difference between these two tuning exercises? I understand that an instance is memory based structures (logical) where as database consists of physical structures.

However, how does one tune a database the physical structure? Does it have to do with file placements/block sizes etc. Would you agree that a lot of that is taken care by ASM now in 11g? What tools are required/available (third party as well as oracle supplied) for these types of tuning scenarios?

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Performance Tuning :: Oracle Row Chaining And Migration

Nov 13, 2010

Recently i have been working analyzing Oracle Row Chaining and Migration in the database. Is their any way to track the chaining & migration of rows as part of database health checkup.

Else we have analyze the table for detecting row Chaining and Migration.

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Performance Tuning :: Tiff Images And Oracle

Oct 31, 2013

We are re-designing our App and we have a critical question, what's the best way (in terms of performance) of using TIFF images (about 20K size) with Oracle.

Currently we have a Windows shared file server and we create the tiff images there under a huge directory structure (like /images/ddddmmyy/aa/bb/001, then /images/ddddmmyy/aa/bb/002, etc, etc). Our database is usually in LINUX version 10, 11 or 12. We create about 200,000 images per day, keep them for 60 days and then remove that structure.

Our Web app (developed with .NET) reads those images just to display them on a Web Session (IE).As you can see, what we are doing now works fine. But network sometimes is an issue and also it's hard to keep synchronization with our DR server, backups, etc.

Are we taking the correct approach? It would be better to have the images in CLOB or BLOBS for better performance? If so, As I mentioned, performance is the KEY FACTOR and the most important item to consider in this design.

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Performance Tuning :: Oracle 11g R2 Result_cache Is Not Working

Oct 25, 2010

I am querying a table having 6 million records,It takes arround 35 seconds in command line terminal using putty in a windows client.

Also the server is linux centos with oracle 11g installed. I saw the method Oracle result_cache which i am suspecting to be fast

my query is
"select /*+ result_cache */ * from relationshipobject;"
SQL> set autotrace traceonly stat
SQL> set timi on

[Code]....

i can i reduce my query execution time and consistent gets?

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Performance Tuning :: How To Limit Oracle Redo

Mar 24, 2013

how do you limit oracle redo?

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