ASH versus reports AWR report

Similar Questions

• Reports of ASHES

  I thought that a report of ASH essentially reported the v $ active_session_history or return of the dba_hist_active_session_history?
  
  What determines how far back you can specify an ASH to report to? that is what determines how far back the contents of dba_hist_active_session_history are kept?
  
  What buffer ASH uses? I understand that this buffer empty when it fills or every hour on dba_hist_active_session_history
  
  Also, what is the difference between v$ active_session_history and gv_$ active_session_history

  V$ ACTIVE_SESSION_HISTORY is a view of the buffer that empties at DBA_HIST_ACTIVE_SESS_HISTORY.

  Like the other views of $ GV, GV$ ACTIVE_SESSION_HISTORY is a global vision for use with RAC.

  By default, lines 1 to 10 are kept in the repository (DBA_HIST_ACTIVE_SESS_HISTORY).

  There are some hidden parameters _ash * to control some of this behavior.

  The data are stored according to DBA_HIST_WR_CONTROL. RETENTION, which can be changed using DBMS_WORKLOAD_REPOSITORY. MODIFY_SNAPSHOT_SETTINGS.

• Review of details of AWR and ASH reports

  Hello...
  
  is there than a documentation on AWR and ASH reports so that the report is studied in detail...
  
  For an example
  
  IN the report of the ASH
  
  If you take Section TOP SQL with TOP events section...
  
  There are number of columns such as SQLID, Planhash, sampled # executions, % activity, event, high-ranking Source, TEXT SQL
  
  Here this column sampled number of executions a number of times where SQL has been executed... right...?
  and another high-ranking Source column wrote his ACCESS TABLE - FULL or any group by clause etc.
  
  In the example above, just like that I want to study in detail with each section of the AWR and ASH report
  
  See you soon...

  Hello

  I have a few articles abour AWR in my blog:

  http://Savvinov.com/2012/09/10/a-map-to-AWR-report/

  Maybe they can help you to a certain extent.

  However, you must understand is no detailed instructions on reading AWR, because:

  (1) AWR is just a collection of performance statistics, so read requires an understanding Oracle performance and how it is measured rather something specific to CWA

  (2) practical experience is most important theoretical knowledge of tham

  Best regards
  Nikolai

• 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)

• Bug? : cannot execute predefined "last awr" report with the latest version of the SQL Developer

  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

• ASH report planning

  Hi all

  11.2.0.1

  AIX 6.1

  My boss asked me to collect the ASH report every 30 minutes for 1 day.

  I want to create a 'ash.sh' script and schedule it on cron batch every 30 minutes.

  How to pass the parameter to the SQL values?

  SQL > @? / rdbms/admin/ashrpt

  Enter the value for report_type: text

  ....

  Enter the value of begin_time: 30/07/13 10:40

  ...

  Enter the duration value: 10

  ...

  Enter the value of report_name: [Enter]

  Thank you very much

  zxy

  yxes2013 wrote:

  My real boss knows not so much of things about it that it's a guy of unix admin before

  But he has hired consultant Oracle to investigate performance problems and do a full scan. The consultant is now act as my second boss. One of the mission it has been for me is to collect the ASH report every 30 minutes for a full cycle of 1 day cover all processes running.

  My question is if I run ASH now at 30 min Beach/delay, the result will be the same if I run it tomorrow by specifying the same period? What worries me is that the current session are more active tomorrow? I'm confused.

  Thank you

  Yes, the output will be even if you run the report tomorrow. ASH means Active session STORY. It contains the history of the session, so all of the ranks is snap_id even if the view is filled every second instead if only during the AWR snapshots. ASH has a same as AWR report retention policy, so you can back up your retention policy settings, default value is 8 days.

• AWR report cannot locate the bad SQLs

  DB version: 11.2.0.2
  Platform: Solaris 10
  
  In our data base RAC 2 nodes, we have patterns of 20 applications. When an application is faced with performance problems, we try to generate AWR for the period in question. But the stats (like bad SQLs) for this scheme to be buried because there is another application SQLs performing even worse.
  
  I know that we cannot create AWR report for specific patterns. But I wonder how his stats are collected in a multi-schema RAC environments that will differentiate between applications.

  But the stats (like bad SQLs) for this scheme to be buried because there is another application SQLs performing even worse.

  Since all applications run in a database and query of the other application run bad then they will be the first candidate of tunning since these are taking more resources and impact on other application requests.
  You can also generate report of ASH for module specific or customer with assistance from under the option set in report of ash.

  set target_module_name = ";
  set target_action_name = ";
  set target_client_id = ";

• Problem report ASH

  Hi expert,

  I have the problem with the reports of ASH, when I run the script for report ash, I have the HTML that contains no data exists for each section of the report ASH.

  This part of ASH report:

  User Top events

  There is no data for this section of the report.

  Back to top of page events
  Top of page

  Events of high background

  There is no data for this section of the report.

  Back to top of page events
  Top of page

  Thnx for all

  @laurent

  Select count (*) x ash$; --> 751

  Select count (*) from SYS. WRH$ _ACTIVE_SESSION_HISTORY; --> 1542

  Your statistics_level a TYPICAL or EVERYTHING--> TYPICAL

  What is the value of parameter _ash_enable hidden--> True

• 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.

• AWR SQL Report does not report the stats

  AWR report only stats beyond a certain level? I have a statement select simple I know is running (executions of v$ sql increases), but when I run a report AWR SQL (awrsqrpt), it says "no data exists for this section of the report.

  Snap Id Snap time Sessions Curs/Sess

  --------- ------------------- -------- ---------

  BEGIN Snap: 370936 10 June 15 07:00:24 856 36.1

  End Snap: 370937 10 June 15 07:20:26 881 38.9

  Elapsed time: 20.02 (mins)

  DB time: 754.82 (min.)

  Summary of SQL DB/Inst: CAMPRD/camprd snaps: 370936-370937

  There is no data for this section of the report.

  -------------------------------------------------------------

  SQL ID: 84kfv4p500pgh DB/Inst: CAMPRD/camprd Snaps: 370936-370937

  There is no data for this section of the report.

  -------------------------------------------------------------

  Full text of SQL

  There is no data for this section of the report.

  I ran the report on the last 4 days and reports

  ORA-20025: SQL 84kfv4p500pgh ID does not exist for this database instance.

  and yet, the executions of V$ SQL continues to increase

  Thank you

  Ian

  CWA only captures statements considered to be Top N (DBA_HIST_WR_CONTROL. TOPNSQL)

  You can use DBMS_WORKLOAD_REPOSITORY. ADD_COLORED_SQL sort AWR it will include

• 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

• 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

• begin and end in awr report

  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

• questions about the awr report &amp; 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

• Oracle AWR and ADDM report for a multiple instance Oracle database 11 g 2 (RAC)

  Hello

  How to create an Oracle AWR and ADDM report for a multiple instance (RAC) Oracle database 11 g 2?

  Concerning

  Hello

  Oracle DB 11 g 2 AWR Global report before 11 GR 2, the awrrpt.sql generation

  under $ORACLE_HOME/rdbms/admin only generates the report awr for the local instance.

  You will need to collect for each RAC instance awr report.

  11 GR 2, there are two new scripts awrgrpt.sql AND awrgdrpt.sql for CARS

  awrgrpt. SQL - AWR Global report (RAC) (global report)

  awrgdrpt. SQL - overall Diff AWR (RAC) report.

  Some other important scripts under $ORACLE_HOME/rdbms/admin

  spawrrac. SQL - Server Performance RAC report

  awrsqrpt. SQL - statement of the standard ANSI SQL92 report

  awrddrpt. SQL - period diff on the current instance

  awrrpti. SQL - workload repository Instance (RAC) report

  REF link:

  ADDM enhancements in Oracle Database 11 g & mdash; DatabaseJournal.com