Automatic optimizer statistics collection

Similar Questions

• Disable the automatic optimizer statistics

  Hello
  
  I wanted to request user_tab_modifications track, the number of rows updated in a week. Because this view is updated automatically when the automatic optimizer statistics collects statistics, I have disabled the automatic optimizer statistics. Now, I will carry out run dbms_stats. FLUSH_DATABASE_MONITORING_INFO(); manually to get the full view with the number of rows updated.
  
  My concern here is, I get the exact number of rows updated per week of user_tab_modifications in doing this? Also, is there anything that is also updated from this point of view outside of optimizer statistics that are collected on a table.
  
  Thank you

  You might try to write a few PLSQL yourself.

  What:

  SQL> create table count_X_updates (update_count number);
  
  Table created.
  
  SQL> insert into count_X_updates values (0);
  
  1 row created.
  
  SQL> commit;
  
  Commit complete.
  
  SQL>
  SQL> create table X (col_1 varchar2(5), col_2 varchar2(5), col_3 number);
  
  Table created.
  
  SQL> insert into X values ('a','first',1);
  
  1 row created.
  
  SQL> commit;
  
  Commit complete.
  
  SQL>
  
  SQL> create or replace trigger count_x_updates_trg
    2  after update of col_1,col_2,col_3
    3  on X
    4  for each row
    5  declare prev_cnt number;
    6  begin
    7  update count_X_updates set update_count = update_count+1;
    8* end;
  SQL> /
  
  Trigger created.
  
  SQL>  update x set col_1 = 'b', col_2='secnd',col_3=2;
  
  1 row updated.
  
  SQL> commit;
  
  Commit complete.
  
  SQL> select * from count_X_updates;
  
  UPDATE_COUNT
  ------------
             1
  
  SQL>  update x set col_1 = 'c' where col_3=2;
  
  1 row updated.
  
  SQL> commit;
  
  Commit complete.
  
  SQL> select * from count_X_updates;
  
  UPDATE_COUNT
  ------------
             2
  
  SQL> select * from x;
  
  COL_1 COL_2      COL_3
  ----- ----- ----------
  c     secnd          2
  
  SQL>
  

  Note: This trigger code must be improved because
  a. several sessions could obtain the same value
  b. it introduced a serialization - several session waiting on a lock on the count_X_updates of the table line - effectively, which means that all other sessions to try to update X will wait (even if they are to be updated lines X) until each previous emits a COMMIT.

  Thus, this demo code is only to show you the PLSQL triggers. But may not be used in Production.

  Practice some PLSQL. Learn about the autonomous operations.

  Hemant K Collette

• enabled automatic optimizer stats collection, but is not running and not appearing not

  enabled automatic optimizer stats collection, but is not running and not appearing not
  
  I've activated automatic optimizer stats collection days ago, but it never worked. DB version is 11 GR 2, OS redhat 5. It shows active in dba_autotask_client, but not in autotask_task. Please help on this issue.
  
  SQL > select client_name, State of dba_autotask_client;
  
  CLIENT_NAME STATUS
  --------
  ACTIVE automatic optimizer stats collection
  advise OFF auto space
  SQL tuning advisor ENABLED
  
  SQL > select TaskName, status, to_char (last_good_date, ' ' YYYY-MM-DD HH24:MI:SS) last_good_date, last_good_duration
  of dba_autotask_task
  where client_name = "auto optimizer stats collection"; 2 3
  
  no selected line
  
  SQL > select program_action, number_of_arguments, active
  of dba_scheduler_programs
  where owner = 'SYS '.
  and program_name = 'GATHER_STATS_PROG '; 2 3 4
  
  PROGRAM_ACTION NUMBER_OF_ARGUMENTS ENABL
  
  DBMS_STATS.gather_database_stats_job_proc 0 TRUE
  
  SQL > select w.window_name, c.autotask_status, c.optimizer_stats, w.repeat_interval, w.enabled
  -, w.duration, w.last_start_date, w.next_start_date
  dba_autotask_window_clients 2 c, dba_scheduler_windows w
  3 where 4 c.window_name = w.window_name
  5 order by last_start_date desc;
  
  WINDOW_NAME AUTOTASK OPTIMIZE ITS REPEAT_INTERVAL
  
  MONDAY_WINDOW ON ON freq = all days; byday = MY. byhour = 22; byminute = 0; BYSECOND = 0 TRUE
  SUNDAY_WINDOW ON ON freq = all days; byday = Sun; byhour = 6; byminute = 0; BYSECOND = 0 TRUE
  SATURDAY_WINDOW ON ON freq = all days; byday = SAT; byhour = 6; byminute = 0; BYSECOND = 0 TRUE
  FRIDAY_WINDOW ON ON freq = all days; byday = FRI; byhour = 22; byminute = 0; BYSECOND = 0 TRUE
  THURSDAY_WINDOW ON ON freq = all days; byday = THU; byhour = 22; byminute = 0; BYSECOND = 0 TRUE
  WEDNESDAY_WINDOW ON ON freq = all days; byday = SEA; byhour = 22; byminute = 0; BYSECOND = 0 TRUE
  TUESDAY_WINDOW ON ON freq = all days; byday = KILL; byhour = 22; byminute = 0; BYSECOND = 0 TRUE
  
  7 selected lines.
  
  SQL >

  Select max (last_analyzed) from all_tables;

  display SQL results above

• automatically optimize for costs of life battery batt to 100% within the parameters of the power manager

  In the settings of my ThinkPad Power Manager W530, I chose the option "automatically optimize for life battery" (battery-> maintenance-> Mode of Charge of the battery). Nevertheless, he always fresh and keeps the battery at 100%. Is it normal for a battery 9 cells?

  Link to photo

  But many articles and discussions here at the forum State, actually in charge at 100% is not tor good battery life (see for example this article http://forums.lenovo.com/t5/Welcome-FAQs-Knowledge-Base/How-can-I-increase-battery-life-ThinkPad/ta-... ). Do not miss anything?

  Thank you!

  Note of the moderator; image (s) for a total of > 50 K converted for the programming of the Forum rules

  No matter how many charge cycles the battery on it, just the time where you change the batteries maintenance mode. If you have configured to maximize battery life, the battery may charge at a lower percentage (somewhere around 90%, more or less a few percentage points), but will show this figure as "integral" or 100% for the system. If you change the mode to load completely, then the maximum capacity will change to read the actual capacity of the battery.

  The only way your situation would be a concern if, after setting the battery in order to maximize the battery life, then using the system on battery and load up once again, the battery always charged up to the full 94 w/h instead of reducing the number.

• Muse automatically optimizes the images that you download for the background on your site?

  Muse automatically optimizes the images that you download for the background on your site?

  Oh, thanks a lot for this. Do you know what the height and width

  increments are for Muse? It is said in my page attributes that the height is

  660 and the width is 960. How does that translate in Photoshop?

  Amy

• Inaccurate statistics calculated by the task of automatic statistics collection

  Hello
  
  I have a table with about 300,000 sets and I manually collected statistics for the table and its index with the command: "EXEC DBMS_STATS.gather_table_stats ('SCOTT', 'Table_test');" Both indices of the table statistics were accurate and the execution of SQL statements were also very powerful. Then, during the night Enterprise Manager recalculated statistics again, but the results were far from exact:
  
  OWNER: SCOTT
  INDEX_NAME: I_TEST_INDEX
  INDEX_TYPE: NORMAL
  TABLE_OWNER: SCOTT
  TABLE_NAME: TEST_TABLE
  TABLE_TYPE: TABLE
  UNIQUENESS: UNIQUE
  COMPRESSION: DISABLED
  PREFIX_LENGTH:
  NOM_TABLESPACE: USERS
  INI_TRANS: 2
  MAX_TRANS: 255
  INITIAL_EXTENT: 65536
  NEXT_EXTENT:
  MIN_EXTENTS: 1
  MAX_EXTENTS: 2147483645
  PCT_INCREASE:
  PCT_THRESHOLD:
  INCLUDE_COLUMN:
  FREELISTS:
  FREELIST_GROUPS:
  PCT_FREE: 10
  LOGGING: YES
  BLEVEL: 2
  LEAF_BLOCKS: 16
  DISTINCT_KEYS: 141
  AVG_LEAF_BLOCKS_PER_KEY: 1
  AVG_DATA_BLOCKS_PER_KEY: 1
  CLUSTERING_FACTOR: 19
  STATUS: VALID
  NUM_ROWS: 141
  SAMPLE_SIZE: 141
  LAST_ANALYZED: November 4, 2008 22:03
  DEGREE: 1
  INSTANCES: 1
  PARTITIONED: NO.
  TEMPORARY: N
  GENERATED: N
  SCHOOL: N
  USER_TABLES: DEFAULT
  USER_STATS: NO.
  DURATION:
  PCT_DIRECT_ACCESS: 100
  ITYP_OWNER:
  ITYP_NAME:
  PARAMETERS:
  GLOBAL_STATS: YES
  DOMIDX_STATUS:
  DOMIDX_OPSTATUS:
  FUNCIDX_STATUS:
  JOIN_INDEX: NO.
  IOT_REDUNDANT_PKEY_ELIM: NO.
  ELIMINATED: NO.
  
  
  The new statistics report that there are only 141 separate in the table key although there are actually 300 000. The result is that SQL statements executing degrades considerably. Does anyone know why the statistics have become so inaccurate? I'm on 10.2.0.1.0.
  
  Kind regards
  Swear

  user633661 wrote:
  The only thing I'm not sure of is if I should include the statistics calculation step in the batch (this is a PL/SQL procedure) - I mean, it's a mixture of normal practices code that calculates statistics with business logic code?

  Swear,

  I think Justin has responded to this already pretty well, it is quite common in environments of warehouses of data or any other leads batch environments. You must be precise (or let's say representative) statistics if you want the CBO to do a good job.

  BTW, do you know if the collection of statistics on an Index organized table is somewhat different that gather on heap-organized tables?

  No, there is no difference. DBMS_STATS (and even surprisingly ANALYZE) know IOT and collect 'table', column and potential segments of infinity and the (mandatory) primary key index (representing the IOT) even if you do not specify a "cascade-online true" in the call DBMS_STATS.

  Kind regards
  Randolf

  Oracle related blog stuff:
  http://Oracle-Randolf.blogspot.com/

  SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
  http://www.sqltools-plusplus.org:7676 /.
  http://sourceforge.NET/projects/SQLT-pp/

• HostCtl exception in statistics collection

  Hi all

  I see a large number of errors (every 20 seconds) in my logs with the following signature:

  September 20, 22:10 host.com pass: [talkative 38840 B 90 "Statssvc.vim.PerformanceManager"] HostCtl Exception in the collection of statistics: Sysinfo error on return operation State: not found. Please see the error VMkernel log for more information

  
  

  I don't see the symptoms of this failure in the work with the environment: everything seems fine, no errors, etc.  I did as she suggested and looked into the VMkernel newspaper, but I don't see any entries of the newspaper he look related or promising.  I also did a lot of research, and although many community jobs include newspapers that include similar lines, no positions I found focus on this particular error.

  I evaluate VMware Log Insight and the number of these errors, it is difficult to see clearly the other errors that may be more critical.

  
  

  Someone at - it no indication on what means this error, or how to fix?

  
  

  Thank you!

  Jason

  
  

  
  

  I was able to get rid of these messages. On servers that have reported this message were several VMS configured with ISOs on warehouses of data as a CD device (not attached).

  I changed "Client" and these messages are gone.

  Hope this will help you.

  This idea came from here.

  Sebastian

• Turn off the feature that automatically optimizes the web browser, so that I can see perpetually my open tabs.

  Two weeks ago, as Firefox was normal and kick ass as usual. Then I realized that Firefox has changed-when you do things in a tab for a particular Web site you're browsing, Firefox now this thing annoying hella where it hides see your other tabs to work and "optimize" your notice on the Web site. There used as an orange button that says Firefox at the top left that had a drop down menu of commonly used functions, like the Download Manager and bookmarks. It was all super convenient. It was bright, noticeable and all the tabs that I worked with were visible at the same time. Now, what happens is, if you go to the top of a tab for a Web site that you look at, it 'unmaximizes' window and reveals once-hidden tabs, which is WICKED STUPID because it does that change the orientation of the web page so that the link that you were once to reach is now outside the trajectory of your mouse What causes epilepsy inducing madness of the glitter of the page; not to mention that it kills the time to redirect your mouse because of a characteristic that is not even help what it is. Personally, I use a computer to work, not to be entertained, as the majority of porn watching freaks of nature on this thing. It should just be something that you can turn off easily. Sorry to be so angry, but I thought that maybe I could get used to it, and it's frankly just one of the more nauseating functions on any piece of software I've ever met. Thank you!

  Looks like you have the mode full-screen (which was always in Firefox). Press F11 on your keyboard. How to make Firefox and Web sites go full screen

• restore the old optimizer statistics with flashback technology

  We use the Oracle 10 g on Linux.

  I want to know we can restore old optimizer staistics with Oracle Flashback technology (using the restore point) in addition to the dbms_stats package.

  Hello

  When you try to the flashback database, all blocks, including changes to the system will be moved to the past.

  So you data dictionary will contain also old information... Think of your data!

  Thank you

• When Firefox in reduced and I work with another program, why does automatically optimize (pop-up) every 10 minutes?

  I use Windows 7 and 8.0.1 Firefox on a PC. It's frustrating. I like Firefox, but it keeps popping up every 10 minutes when it is minimized and I work in another program. I can't continue to use if it cannot be repaired. I just changed from 3.6 and never had any problems. In addition, no settings have been changed.

  Start Firefox in Firefox to solve the issues in Safe Mode to check if one of the extensions or if hardware acceleration is the cause of the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > appearance/themes).

  • Makes no changes on the start safe mode window.
  • https://support.Mozilla.com/kb/safe+mode
  • https://support.Mozilla.com/kb/troubleshooting+extensions+and+themes

• I got a program to automatically optimize wondows but it has now disappeared. Where can I find a new (which works)

  Thanks.I tried one of jiisoft.com, but it does not work.

  Hello

  1 are. what program you referring?

  I suggest you to use your favorite search engine to find the information you're looking for.

  THIRD WARNING:

  Using third-party software, including hardware drivers can cause serious problems that may prevent your computer from starting properly. Microsoft cannot guarantee that problems resulting from the use of third-party software can be solved. Software using third party is at your own risk.

  Hope this information is useful.

• understanding

  Hello world
  
  could someone please tell me timed_statistics and statistics_level option clearly I Googled it but information provided seems to reach very limited for me
  
  http://docs.Oracle.com/CD/B28359_01/server.111/b28320/initparams245.htm#
  
  http://docs.Oracle.com/CD/B28359_01/server.111/b28320/initparams240.htm
  
  Thanks in advance
  
  Shareef

  912856 wrote:
  Hello world

  could someone please tell me timed_statistics and statistics_level option clearly I Googled it but information provided seems to reach very limited for me

  http://docs.Oracle.com/CD/B28359_01/server.111/b28320/initparams245.htm#

  http://docs.Oracle.com/CD/B28359_01/server.111/b28320/initparams240.htm

  Thanks in advance

  Shareef

  These are two different things in oracle.

  These documents are clear enough, let us know what part you do not understand.

  Timed_statistics - they are linked to obtain the time of the operating system. Event occurs, oracle will score with timestamp and will show us when these events took place. Usually, you get these values of v$ sesstats and v$ sysstats.
  Statistics_level - this is different from the previous. If the value is specified at ALL then oracle will meet additional statistics. These statistics are associated with the database and operating system. By example, oracle will gather additional statistics as the number of buffer access time, numbers of time oracle generates tampons Sales etc etc.
  These statistics are required for the following features for work and the desired output on their part. If the Basic oracle value will meet bare minimum information, what is happening in LMS information and memory.
  Oracle will keep these statistics in the area of SGA and then written in database tables internal disks IE oracle.

  The features are:
  Workload automatic repository (AWR) snapshots
  Automatic diagnosis of the bases (ADDM) monitor
  All alerts generated by the server
  Automatic SGA memory management
  Automatic optimizer statistics collection
  Level object statistics
  Application of end-to-end Tracing (V$ CLIENT_STATS)
  Statistics of distribution of database time (V$ SESS_TIME_MODEL and V$ SYS_TIME_MODEL)
  Level of service statistics
  Buffer cache Advisory
  View MTTR
  Shared pool sizing advice
  Segment level statistics
  Notice to the targets of the PGA
  Timed statistics
  Track statistics

• 'auto collection optimizer stats' in em12cr3

  During installation of EM 12cR3 YES noted for "disable statistics gathering jobs" and indicated it would disable for me.

  After installation, I look at dba_auto_task and see that "automatic optimizer stats collection" is enabled.

  The installation Prerequisites overview of the Kit EM docs also say to disable this for installation and upgrade.

  What is not clear to me is: ' did for the installation/update?  should collection be enabled after the installation is complete? »

  Hi Sherrie,

  disables statistical optimizer auto should be only during installation and upgrade of 12 c cloud control

  Once its done you can activate the automatic collection of optimizer statistics at rest DB level

  Kind regards

  Rahul

• Running in parallel DML not forced

  Hello

  I work with an Oracle RDBMS 12cR1,

  I amcurrently how can I influence parallel experimentation DML and parallel DDL (for example edit.

  For example, I have the following settings:

  parallel_degree_level = 100

  parallel_degree_limit = CPU

  parallel_degree_policy = MANUAL

  These are the default values.

  At this point, that means I should be able to influence the optimier through tips.

  There is no statistics on the table I want to insert data.

  I started with:

  ALTER session force parallel dml parallel 4;

  Then I have an insert of type:

  insert into table (list of aliases for column using the dbms_random package)

  Select (column list) of the double

  connect by level < = 100000;

  When I followed the execution using EM, I don't see the parallel expected excution.

  The execution plan looks like this:

  CREATE statement

  load in select

  the gathering optimizer statistics

  connect to without filtering

  double quick

  This isn't a 'great' table and select to insert is not "big".

  If because I have such a '' big, '' set that Oracle chooses not to use parallel DML had?

  How can I force parallel DML execution?

  Thanks and greetings

  Laury wrote:

  Yes, after some further tests, I discovered that connection by does not allow for parallel processing.

  Yet, I do not observe the same kind of results as you.

  Think about how a connect works by, and it must be clear that it would be very difficult to implement a parallel connection by - especially when the driving table has only one row. But you don't really want to use a simple connect by to generate a large amount of data because of the impact this can have on memory.

  Once you've worked out why you do not get the parallelism you should be found - your parallel functions ARE enabled? Your parallel_max_servers is not null (you keep do not answer the question on parallel settings)-you can introduce the strategy who joined a small "connect by" result set to itself and you give the complete end parallelism you need:

  Insert / * + parallel (second_emp, 6) * / into second_emp

  (

  EmpNo,

  Ename,

  employment,

  Bishop.

  HireDate,

  SAL,

  Comm,

  DEPTNO

  )

  with generator as)

  Select

  rownum id

  Of

  Double

  connect

  level<=>

  )

  Select

  round (dbms_random.value (1: 500000)) like empno,

  dbms_random. String name ('U', 10),

  random_job as job,

  random_mgr as Bishop,

  trunc ((sysdate-1000) + dbms_random.value (0.366)) as hiredate.

  round (dbms_random.value (800, 300)) as sal,

  -decode (rounds (dbms_random.value (0, 1401)), 1401, null, rounds (dbms_random.value (0, 1401))) as comm

  (

  case

  When ((dbms_random.value (0, 1401)) round between 1000 and 1401)

  then null

  another round (dbms_random.value (0, 1401))

  end

  ) as Comm.,

  TO_NUMBER ((substr (round (dbms_random.value (10, 30)), 1, 1) |)) '0')) as deptno

  Of

  (select 1 n2 of the generator where id)<= 100)   ="">

  (select 1 n2 of the generator where id)<= 1000)  ="">

  ;

  Note in particular the subquery WITH which will generate a small TWG internally; then the join between two copies of this table - and this join does not use the rownum or operator LEVEL. This gives you a merge join parallel that generates a large amount of data and allows the PX servers make all calls to dbms_random.

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

  | ID | Operation | Name                      | Lines | Bytes | Cost (% CPU). Time |    TQ | IN-OUT | PQ Distrib.

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

  |   0 | INSERT STATEMENT.                           |       |       |     7 (100) |          |        |      |            |

  |   1.  TRANSFORMATION OF THE TEMPORARY TABLE.                           |       |       |            |          |        |      |            |

  |   2.   LOAD SELECT ACE |                           |       |       |            |          |        |      |            |

  |   3.    COUNT                            |                           |       |       |            |          |        |      |            |

  |   4.     CONNECT TO WITHOUT FILTERING.                           |       |       |            |          |        |      |            |

  |   5.      QUICK DOUBLE |                           |     1.       |     2 (0) | 00:00:01 |        |      |            |

  |   6.   COORDINATOR OF PX |                           |       |       |            |          |        |      |            |

  |   7.    PX SEND QC (RANDOM). : TQ10001 |     1.    26.     5 (0) | 00:00:01 |  Q1, 01 | P-> S | QC (RAND) |

  |   8.     LOAD SELECT ACE (HYBRID TSM/HWMB) |                           |       |       |            |          |  Q1, 01 | SVCP |            |

  |   9.      OPTIMIZER STATISTICS COLLECTION |                           |     1.    26.     5 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  |  10.       THE CARTESIAN MERGE JOIN.                           |     1.    26.     5 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  |  11.        RECEIVE PX |                           |     1.    13.     2 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  |  12.         PX SEND BROADCAST | : TQ10000 |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | P-> P | BROADCAST |

  | * 13 |          VIEW                       |                           |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | SVCP |            |

  |  14.           ITERATOR BLOCK PX |                           |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | ISSUE |            |

  | * 15 |            TABLE ACCESS FULL | SYS_TEMP_0FD9D66BC_3BA6C3 |     1.    13.     2 (0) | 00:00:01 |  Q1 00 | SVCP |            |

  |  16.        KIND OF BUFFER.                           |     1.    13.     5 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

  | * 17.         VIEW                        |                           |     1.    13.            |          |  Q1, 01 | SVCP |            |

  |  18.          ITERATOR BLOCK PX |                           |     1.    13.     2 (0) | 00:00:01 |  Q1, 01 | ISSUE |            |

  | * 19.           TABLE ACCESS FULL | SYS_TEMP_0FD9D66BC_3BA6C3 |     1.    13.     2 (0) | 00:00:01 |  Q1, 01 | SVCP |            |

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

  Information of predicates (identified by the operation identity card):

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

  13 - filter ("ID"<>

  15 - access(:Z>=:Z AND:Z)<>

  17 - filter ("ID"<>

  19 - access(:Z>=:Z AND:Z)<>

  Concerning

  Jonathan Lewis

• Analysis of paintings and other task planner

  Hello

  DB: 11 GR 2 on Windows Server 2008R2

  1. is there an example how to do to activate (implement) the maintenance task scheduler, which is to analyze the tables and checking of these

  tasks/settings:

  /*

  Check if the "automatic optimizer stats collection" is there and activated

  */

  Select * from DBA_AUTOTASK_OPERATION;

  */

  Select * from DBA_AUTOTASK_SCHEDULE;

  /*

  Check which group window it is in

  */

  Select * from DBA_AUTOTASK_CLIENT;

  /*

  Check what windows are part of this group of windows

  */

  Select * from dba_scheduler_wingroup_members;

  /*

  Check if the windows in the group are enabled

  */

  SELECT * FROM dba_scheduler_windows;

  2. the Scheduler can be configured through SQL Developer?

  Thanks for your comments!

  Hello

  You will find useful information in the Oracle documentation:

  Automated management of Database Maintenance tasks

  http://docs.Oracle.com/CD/E11882_01/server.112/e25494/tasks.htm#ADMIN0235

  Yes you can set the Scheduler through SQL Developer tasks. See the following link:

  ORACLE-BASE - Support SQL Developer 3.1 Scheduler (DBMS_SCHEDULER)

  http://www.Oracle-base.com/articles/Misc/SQL-Developer-31-Scheduler-support.php