Analysis of AWR report
Hi allI have a database performance problem. Sometimes my database doesn't work @ all. It hangs for a long time. a lot of user concurrency, cpu, I\O and other expectations are often produce when there is a lot of data. Basically, the application get stuck because of this performance.
I had a less than the interval awr report.
It is here http://www.4shared.com/file/cYzYGQYG/awrrpt_1_3230_3231_charith.html
can someone please tell me what I have to do on this poor performance and through this document.
Basically, the affected areas. The speculation and suggestions...?
Please give me a help guys...
Thank you
Max
I'm not able to open your report now, but your thought process should be like this:
(1) is your complete database slow or just a few sessions that are of high value added, taking the attention?
(2) in the case of a complete database, generate AWR report and also to monitor statistics of the OS/IO during this interval. Recover waiting events will also help you understand why meetings are pending and it will give you an advance to the next step. For the examples, several sessions are waiting for small set of CBC, latches etc.
(3) in the case of a few sessions, try to generate sql trace for those. It's very good point to start in such cases, you will give guilty SQLs, wait events, bind variable information etc. (talk about 10046 trace).
In your case, it seems to lock is a problem (to be honest, it is a fat guess based on the limited commentary you provided).
Also, try Snapper of Tanel Poder.
Cheers, Neeraj
Tags: Database
Similar Questions
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DB version: 10 gr 2
After watching Top 5 wait events and SQL Statistics, what is the next most important thing I should look for an AWR report?
It would depend on the top events of the page you saw. For example, if you saw the events of 5 waiting albums, he had very high DB file scattered read, this means that there are statements that go mainly to access the complete table. You must search on these queries. Or if there is a high Contetion lock, for example, Shared Pool latch Conteions, this means that there are many sttement that is intended for hard analysis and dispute this lock of. So, you should look for these sql who are cnstants more and do not bind variable.
So this isn't a standard way, but it's according to what you see. On the blog of Jonathan Lewis, there is an excellent series of how to read the Statspack report. I suggest to read. This would make a good base to cross with AWR report also.
HTH
Aman... -
Details of SQL query in AWR report
Hello
In the AWR report, I found that there are a few SQL with full table scan queries
How drill us in this topic and find which table have full analysis
Yes with Explain plan we can do but is there another way in Oracle 11g
Please let me know
See you soonKnight wrote:
In the AWR report, I found that there are a few SQL with full table scan queries
How drill us in this topic and find which table have full analysisYes with Explain plan we can do but is there another way in Oracle 11g
Please let me knowWhat, exactly, you look in the AWR report allowing you to decide that some SQL statements are complete tablescans but, at the same time, don't show you the tables that are being analyzed?
If the statement is visible in the SQL "order by...» "sections of report then execution plans and workloed for education is also in the AWR. You can access either from Enterprise Manager, either by running the report $ORACLE_HOME/rdbms/admin/awrsqrpt.sql.
Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
Author: core Oracle -
My AWR report showing this.
Instance efficiency percentage (target 100%)
% Buffer Nowait: remake of 99.99% of NoWait: 100.00
Buffer % success: 99.96% sort in memory: 100.00
Library % success: 99.99% soft Parse: 99,62
Run parse %: latch 95.74 hit %: 96.03
Analyze the CPU to analyze Elapsd %: 89,15% Non-Parse CPU: 97,93
Please comment on it.
Kind regards
VNFrom there you can interpret your SGA is used correctly and run more happens that is soft analysis which is also a good sign.
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My DB is oracle10g.
In enterprise manager, we can generate the report of ASH. Also, we can generate AWR report in the server through files awrrpt.sql.
ASH report provides the information below.
Main events
Load profile
Top of page SQL
Albums of PL/SQL
Top of page sessions
Top of page objects/files/locks
Activity over time
Provide information below AWR reports.
Summary of the report
Wait events statistics
SQL Statistics
Statistics from the instance activity
IO statistics
Buffer Pool statistics
Advisory statistics
Wait statistics
Cancel statistics
Latch statistics
Segment statistics
Cache dictionary statistics
Library Cache statistics
Memory statistics
Flow statistics
Statistics on resources limit
init.ora parameters
My question is, under what circumstances, report of ASH can be seen and what circumstances AWR report is good to see? Any help is appreciated. Thank youin what circumstances, report of ASH can be seen and what circumstances AWR report is good to see? Any help is appreciated. Thank you
Ash can help you when there is felt a sudden degradation in performance of the database.
AWR - past historical snapshot intervals.AWR, stores the performance statistics of session for analysis later.
ASH - storage is not persistent and with time, the older entries are removed to accommodate the new. They can be viewed using V$ ACTIVE_SESSION_HISTORYHTH
-André -
This output on AWR report mean?
Hello.
I'm having problems of performance with an Oracle Database EE 12.1.0.2.0 in a particular query.
I ran an AWR report and in the ADDM section get me the following for the troubled query:
Raison d'etre
High level calls to execute the SELECT statement with SQL_ID
'6a9fmtbam27fp' are responsible for 99% of the time spent on database
the SELECT statement with SQL_ID '8uqsfw32bytvh '.
The query that I'm having this problem is the SQL_ID '8uqsfw32bytvh '.
I couldn't find a relationship between the SQL_ID '8uqsfw32bytvh' and '6a9fmtbam27fp '.
Do you know guys what the ADDM meant by "call for higher level? I couldn't find information online.
Thank you.
Jonas
This comes from data ASH - V$ ACTIVE_SESSION_HISTORY / DBA_HIST_ACTIVE_SESS_HISTORY.
For a SQL statement running in the titles the sql entry highlights so sql called from procs, sql calling functions that execute sql, etc.
-HIGH LEVEL SQL ID (and other useful columns as PLSQL_ENTRY_OBJECT_ID, PLSQL_ENTRY_SUBPROGRAM_ID, PLSQL_OBJECT_ID, PLSQL_SUBPROGRAM_ID)
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Number of processors and cores in AWR report
Hello
I have a report AWR to my system and a couple of entries confuse me.
Q1. It's showing 3 carrots, 2 Sockets and 4 processors. The CPU and the Sockets, I understand that 2 chips with 2 processors per chip so 4 CPU.
What confuses me, is the fact that it shows 3 carrots. Is that that by CPU cores? Othererwise 3-4 makes no sense?
Q2. What is the difference between DB, time CPU and CPU DB?
My understanding is that DB time is the time used by the process, including the time processor and wait time. Because a system can have more than one processor, it is quite natural that DB time may exceed to elapse time - since you have multiple processors that contribute to this time (I guess that DB time cannot be really more time elapse * our processors?)
In fact, you could say if DB time does not exceed the time to elapse, then you have a Nock idle system?
My understanding of time CPU, is that it's time where each process actually gets treatment CPU (so it does not time-out). I think that the AWR report confusingly used the term time CPU and CPU DB, to mean the same thing?
clearly greatly appreciated
Jim
Hi Jimbo,
Q1. "Nuclei" in the CWA report represents the quantity of physical processor cores and the "processors" takes into account the simultaneous multithreading so in your case, one option could be a CPU Socket has a dual core (not type hyperthreading) and the other CPU Socket has one heart (hyperthreaded). If this is the case, you will have 3 physical 4 CPU cores, (because it takes into account the hyper-threaded architecture) and 2 taken. It's just an option, you will need to check it out.
Q2. No-Idle wait events are events that are not classified by Oracle as a "Idle" of events to wait wait:
- Example of Idle wait-event: SQL * Net client message (server process is waiting for the client process to do something)
- Idle wait-event example: db file scattered read (event waiting user IO representing a multilock read as full scan of the table or full scan small index.
- You can get a complete list of active waiting events by running:
Select name from v$ event_name where wait_class <> "inactive".
- You can get a full list of the events of inactive waiting by running:
Select name from v$ event_name where wait_class = 'Idle '.
DB time is therefore the sum of all events of active waiting and also the CPU time that is a statistic:
- You can see the value of the amount of time CPU in 10s of miiliseconds (centisecondes) for an exeuting session:
SELECT THE VALUE
FROM v$ sesstat JOIN v$ statname USING (statistics #)
WHERE name = 'CPU used by this session' AND SID =
- You can see the value of the time total CPU in 10s of milliseconds (centisecondes) for the instance of exeuting:
SELECT the value from v$ sysstat
WHERE name = 'CPU used by this session.
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awrrpti script - awr report fails
Friends...
OS: Linux
DB: 11 GR 2
I'm trying to solve this riddle, supposed to be a simple fix but not able to finish it...
We run awrrpti script to generate AWR report for the whole day. What I do is ask DBA_HIST_SNAPSHOT and get the snapshot min (first) and max (last) of the day. Then I fed that range from snap_id to awrrpti script to generate AWR report all day to single instance.
It works perfectly well, but if instance gets restarted during the day then my approach above does not work and AWR report generation fails.
Current approach:
1. the DBA_HIST_SNAPSHOT query
2. download MIN (snap_id), MAX (snap_id) for the day
3. power #2 to awrrpti via bind variable
4 generate the unique HTML report for the instance
Query used to collect the id of component software snap-in min/max:
Select min (snap_id), max (snap_id)
Of
(select snap_id, begin_interval_time, end_interval_time
of dba_hist_snapshot
where begin_interval_time > = trunc(sysdate-1)
and being_intreval_time < = trunc(sysdate-1+23/24)
);
Tips to avoid failures of AWR report generation if instance gets restarted?
How to go to the entry below in simple sql? It is possible to start «WITH max_startup...» "in the sql script?
Yes, there is no problem. Is it just another way to write the query
But you can use this one instead:
SELECT MIN(dhs.snap_id) min_snap_id, MAX(dhs.snap_id) max_snap_id FROM DBA_HIST_SNAPSHOT dhs, (SELECT MAX(startup_time) max_startup_time FROM DBA_HIST_SNAPSHOT) mst where dhs.startup_time = mst.max_startup_time and begin_interval_time >= trunc(SYSDATE-1) and begin_interval_time <= trunc(sysdate-1+23/24) ;
again will try, test and update this blog
Forum! Please, I beg you.
Concerning
Juan M
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How to activate the keys to generate and view the AWR reports Developer SQL
Version: 4.0.3.16
Build: HAND - 16.84
S/n > (sid) > Performance > AWR report viewer
I am able to select the start and end ID, but the following buttons are disabled:
- Entries Toggel
- Generate the report
- Save to file
- Open in browser
What needs to be done to enable these buttons?
Hello
After entering start Id and the Id of the end, the button "report" will be activated, and then after that the report generated (by clicking the report generate) rest buttons button is activated. As shown in the image below.
Hope it will be useful.
Kind regards
Sanjaya
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Hi all
Hope all are well. I need your help, I doubt reading the awr report.
Summary of the report
Cache sizes
Start End Cache buffers: 572 M 572 M Std block size: 8K Size of the shared pool: 408 M 408 M Log buffer: 13 604 K My question is what is 'START' and 'END' in the figure above and why to cache buffer and shared pool sizes are the same for BEGIN and END.your help appreciated, thanks in advance.
Best regards.
size of the buffer at the start of the snapshot cache
size of the buffer at the end of the snapshot cache
Shared at the beginning of the snapshot pool
Shared pool, at the end of the snapshot
So that means: either you did not Oracle or Oracle to change these settings dynamically does not need to change.
Always send four-digit version of your database and platform info. This forum is not keeping track of it.
---------------
Sybrand Bakker
Senior Oracle DBA
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questions about the awr report &; sqlt
Hi guys,.
DB version: 10.2.0.5
Need your advice.
For my AWR report, I put the 30-day retention period. From my understanding, the information in awr report are taken from several views of dba_hist *.
Points of view takes only those albums n intenstive SQL Statistics on resources?
I ask this because I have a doubt. Let's say that on 18/03/2014, I detected a long SQL with sql id xxx.
Using SQLT (such method), I can only see the historical performance of Plan (delta) for this particular SQLs 16/03, 17/03, 18/03.
In this case, we can say that the SQLs shot only 3 days for the last 30 days? Or it can also mean that the particular SQL was not classfified at the top of the page resource n intensive 18/02 to 15/03 SQLs (probably use a better plan - for example: plan a different value)?
Thank you
That is right.
Concerning
Jonathan Lews
-
Using sql developer before 4.x... report works fine
Using SQL developer 4.0.0.13... report fails with ORA-01422
using the actual query to generate awr against the same range of component snap works perfectly
I opened a SR on the question
Thank you
It's always a good idea to open a SR when you are able. I assume that you have already received a response from support. For others I wondered about this, the question is likely related to running the report against a CCR environment, as indicated in the following bug:
Bug 18132564 - LAST AWR REPORT FAILS WITH ORA-01422 IN CCR ENVIRONMENTS
The call of the AWR report requires parameters for a DB and an ID of Instance, so that the report should run, as in earlier versions, for only the current instance, or be modified to run all instances in the cluster.
Kind regards
Gary
SQL development team
P.S.: And, in fact, a discussion prior forum - ai2 4.0-AWR and ASH giving ora-01427
lead following bugs are connected and supposed to be fixed for SQL Developer 4.0...
Bug 17481944 - PERFORMANCE PANELS NEED AWR/ASH/ADDM FOR RAC ENVIRONMENTS SUPPORT
... with the developer commenting
I've added a number instance selection control to the various reports: ASH,.
AWR, difference and SQL. The control is supposed to be visible when the
connection is a RAC system, tests should a RAC.So if you are not on a RAC system, or are on CARS but do not see the selection number instance control, please let us know.
Post edited by: Gary Graham
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A little confused in the generation of awr report using awrrpt.sql
Here are the pictures that we have in the repository.
8257 November 13, 2013 02:00 1 8258 November 13, 2013 02:30 1 8259 November 13, 2013 03:00 1 8260 November 13, 2013 03:30 1 8261 November 13, 2013 04:00 1 8262 November 13, 2013 04:30 1 And the test run we had was between 02:15 at 03:45. What shots should I choose as the ID of the snap-snap-in begin end snap ID.
I got this question when I saw how the shots were taken as snap ID 8258
SNAP_ID BEGIN_INTERVAL_TIME END_INTERVAL_TIME --------- ------------------------------ ----------------------------
8258 13 NOVEMBER 13 02.00.19.314 AM 13 NOVEMBER 13 02.30.23.284 AM where I was going to select 8257 as the ID of the snap-snap-in begin.
Which snap IDs makes more sense for the time window of 02:15 at 03:45.
Thank you
Siva.
Yes, after 02:15 activity is recorded in wink 8258, because at the time the 8257 snap was taken (02:00) the workload has not watched yet. In order something to be registered, it must extend the instant collection interval. Instant is the current state of the instance, and if you set the snapshot collection at intervals of more than an hour, you might be missing information. Also there is no need to set the very short interval (provable 15 min.). An hour is an average value, and that's by default. On the first response I wrote snap 8527 because under 'time window' 8527 is correct snap_id, but in the context of statistical collection snap_id 8528 is correct.
Post edited by: IvicaArsov
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Hi all
11.2.0.1
AIX 6.1
I had this big event awr report.
Can you help me how to interpret this please. Or what is the value of looking here? Thank you very much
The main events in AWR report
I have
n
Snap s Snap A
Snap the t hard event time start Avgwt DB A
Time event ID # (m) expected grade (s) (ms) % S waiting class
------ --------------- --- ---------- ---------------------------------------- ----- -------------- -------------- -------- ------- ------ ---------------
13902 13/09/16 09:00 1 60.05 os thread start 1 140,00 11.08 79,11 56 0,0 Concurrency
13902 13/09/16 09:00 60.05 1 CPU time 2 0.00 0.00 9,45 48 0.0 CPU
13902 13/09/16 09:00 1 60.05 log file parallel write 3 1506.00 1.84 1.22 9 0.0 IO system
13902 13/09/16 09:00 1 60.05 control file parallel write 4 1291.00 1.41 1.09 7 0.0 IO system
13902 13/09/16 09:00 1 log file sync 60.05 5 721.00 1.03 1.43 commit 5 0.0
13903 13/09/16 10:00 1 60.05 os thread start 1 138.00 10.36 75,10 47 0.0 Concurrency
13903 13/09/16 CPU 60.05 1 10:00 hour 2 0.00 0.00 10,28 47 0.0 CPU
13903 13/09/16 10:00 1 60.05 log file parallel write 3 1575.00 1.73 1.10 8 0.0 IO system
13903 13/09/16 10:00 1 60.05 direct path read 3 486.00 1.73 3.56 8 0.0 IO user
13903 13/09/16 10:00 1 60.05 control file parallel write 4 1285.00 1.51 1.17 7 0.0 IO system
13903 13/09/16 10:00 1 log file sync 60.05 5 823.00 1.08 1.32 commit 5 0.0
13904 13/09/16 11:00 60.05 1 CPU time 1 0.00 17,06 0.00 CPU 32 0.0
13904 13/09/16 11:00 1 60.05 os thread start 2 145.00 10,65 73.46 20 0.0 Concurrency
Thanks, I just tell the users, there is no problem in the comic book, and the stats is normal and no suspiscious activity and that the problem is in the minds of users only.
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What is the measure of the value "Waiting" in AWR report?
Event Expected % Time - out Wait total (s) times AVG wait (ms) Waiting for /txn SQL * Net more data from dblink 406 747 466 1 184.13 reading of scattered files DB 28 659 330 12 12.97 SQL * Net message from dblink the 30 115 254 8 13.63 log file parallel write 21 021 177 8 9.52 Hi all
As the example below, I question what is the measure of the value "Waiting" in the section "event wait" AWR report?
Because "Expected" the value is high, but "Queue time Total (s)" is low. example "SQL * Net message from dblink the" a 30 115 "expected' but 'Queue time Total (s)' lower 'DB file scattered read' w 28 659 'wait '.
Could you please explain more about the value "waiting"?
Thank you
Hiko
taohiko wrote:
Event Waits %Time -outs Wait total (s) times Avg wait (ms) Waits /txn SQL * Net more data from dblink 406 747 466 1 184.13 reading of scattered files DB 28 659 330 12 12.97 SQL * Net message from dblink the 30 115 254 8 13.63 log file parallel write 21 021 177 8 9.52 Hi all
As the example below, I question what is the measure of the value "Waiting" in the section "event wait" AWR report?
It is simply a... count the number of times where the system had to "WAIT" on the specified event.
Because "Expected" the value is high, but "Queue time Total (s)" is low. example "SQL * Net message from dblink the" a 30 115 "expected' but 'Queue time Total (s)' lower 'DB file scattered read' w 28 659 'wait '.
Watch "AVG time-out. In one case, there are fewer occurrences of the event, but the average wait by event time was higher.
If I buy 3 burgers and pay $1000 each
or I buy 500 burgers and pay $1.00 each.
Why 3 hamburgers cost more than 500 burgers?
Could you please explain more about the value "waiting"?
"Waiting" is the number of times that the system had to wait for the named event, during the sampling period.
"Total wait time" is the total time (measured in seconds) spent waiting on all occurrences of the specified event, during the sampling period.
"Avg" wait"is the time (expressed in milliseconds) means spent on each occurrence of the specified event, during the sampling period.
It seems pretty obvious. You count how many times it happens something (wait), you measure it, time spent doing this something fracture (total wait time) and tells you the total time spent (total wait time) by the number of times it happened (waits) to find out the average time spent on each occurrence of that something.
Thank you
Hiko
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