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 :: Snapshot Skipped In Between Scheduled Time?

Sep 11, 2013

Yesterday, there were performance issue at server. So today, when i am generating report for that particular period, found snapshot id sequence is serially but with skipped hourly timed. Instead of generating report at 15:30, it generated at 16:30.

Enter value for num_days: 2

Listing the last 2 days of Completed Snapshots
Snap
Instance DB Name Snap Id Snap Started Level
------------ ------------ --------- ------------------ -----
tagidev TAGIDEV 2857 10 Sep 2013 00:30 1
2858 10 Sep 2013 01:30 1
2859 10 Sep 2013 02:30 1
2860 10 Sep 2013 03:30 1
2861 10 Sep 2013 04:30 1
2862 10 Sep 2013 05:31 1

[code]....

Below are the details at alert log -

Tue Sep 10 14:28:20 2013
Thread 1 cannot allocate new log, sequence 7029
Checkpoint not complete
Current log# 2 seq# 7028 mem# 0: E:APPORACLEORADATATAGIDEVREDO02.LOG
Thread 1 advanced to log sequence 7029 (LGWR switch)

[code]....

1) why snap didn't started at 15:30?

2) since database just started at the scheduled time of AWR snap time. But generated at 16:32 instead of 16:30, though last services "SMCO" is started at 16:42. How it snap id generated for this particular time?

3) what does "kewastUnPackStats(): bad magic 1 (0x000000001B3CE48D, 0)" mean?

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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 :: 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 :: 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 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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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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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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Aug 12, 2013

I have a requirement to create a generic script to generate awr report on the basis of two timings . We are planning to do load test on multiple server. The user will key in the start time and the end time of the load test and the script should round off the user entered time to the nearest snapshot id and generate a awr report. I have tried using the dba_hist_snapshot table fields begin_interval_time and end_interval_time column. However it failed.

The servers are running on 11g as well as 10g and few are in RAC and few single instances.

/************************************
* INPUT PARAMETERS
************************************/
UNDEFINE FROM_TIME
UNDEFINE TO_TIME

[Code]....

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SQL> explain plan for MERGE /*+ parallel (rq, 16) */
INTO DWH_BILL_DET rq
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[code].....

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Oct 20, 2010

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Jun 16, 2011

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How many records begin to be too many?

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any possible reason that we'd have to re-install a procedure to correct a performance problem?

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For example, I have the following simple query:

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Questions: With respect to the above query,
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DECODE (V_SELLOB, 'DEFAULT', V_SELLOB, LOB_DESC) IN
OPEN v_refcursor FOR
SELECT /*+ FULL(a) PARALLEL(a, 5) */
*
FROM items a
WHERE a.sku_status = 'A'

[code]...

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