query on dba_free_space ends waiting for events db file sequential read

Similar Questions

• "the db file sequential read" waiting for event slow down an application.

  "the db file sequential read" waiting for event slow down an application.
  
  It is a rather strange problem. There is an update statement that hangs on the wait event 'db file sequential read' and until you restart the database, the query works fine. It happens once a week, usually Monday or after several days of large amount of work.
  
  I checked the processor and is fine, memory is very good, although the SGA and PGA have taken maximum memory. Flow of the disc seems to be ok since each another session on the basis of data looks very good.
  
  I guess that there is a missing configuration to avoid having to restart the database each week.
  
  Any help is greatly appreciated.

  Hello

  If you want same order of the tables as plain exp after reboot just go with ordered hint

  UPDATE item_work_step
  SET user_name = :b1,
  terminal = SYS_CONTEXT ('USERENV', 'TERMINAL'),
  status_cd = 'IN PROCESS'
  WHERE item_work_step_route_id =
  (SELECT item_work_step_route_id
  FROM (SELECT /*+ORDERED */ iws.item_work_step_route_id
  FROM user_role ur,
  work_step_role wsr,
  work_step ws,
  app_step aps,
  item_work_step iws,
  item_work iw,
  item i
  WHERE wsr.role_cd = ur.role_cd
  AND ws.work_step_id = wsr.work_step_id
  AND aps.step_cd = ws.step_cd
  AND iws.work_step_id = ws.work_step_id
  AND iws.work_id = ws.work_id
  AND iws.step_cd = ws.step_cd
  AND iws.status_cd = 'READY'
  AND iw.item_work_id = iws.item_work_id
  AND iw.item_id = iws.item_id
  AND iw.work_id = iws.work_id
  AND i.item_id = iws.item_id
  AND i.item_id = iw.item_id
  AND i.deleted = 'N'
  AND i.item_type_master_cd = :b3
  AND ur.user_name = :b1
  AND aps.app_name = :b2
  AND ( iws.assignment_user_or_role IS NULL
  OR ( iws.assignment_user_or_role IN (
  SELECT ur.role_cd
  FROM user_role ur
  WHERE ur.user_name = :b1
  UNION ALL
  SELECT :b1
  FROM dual)
  AND iws.assignment_expiration_time > SYSDATE
  )
  OR ( iws.assignment_user_or_role IS NOT NULL
  AND iws.assignment_expiration_time <= SYSDATE
  )
  )
  AND (iws.pend_date IS NULL OR iws.pend_date <= SYSDATE
  )
  ORDER BY aps.priority,
  LEAST (NVL (iw.priority, 9999),
  NVL ((SELECT NVL (priority, 9999)
  FROM item_work
  WHERE item_id = i.parent_id
  AND work_id = 42),
  9999
  )
  ),
  DECODE (i.a3, NULL, 0, 1),
  NVL (iw.sla_deadline,
  (SELECT sla_deadline
  FROM item_work
  WHERE item_id = i.parent_id
  AND work_id = 42)
  ),
  i.parent_id,
  i.item_id) unclaimed_item_work_step
  WHERE ROWNUM <= 1)
  

  If you want to get rid of the nested loops use USE_HASH

  UPDATE item_work_step
  SET user_name = :b1,
  terminal = SYS_CONTEXT ('USERENV', 'TERMINAL'),
  status_cd = 'IN PROCESS'
  WHERE item_work_step_route_id =
  (SELECT item_work_step_route_id
  FROM (SELECT /*+ORDERED USE_HASH(ur wsr ws aps iws iw i) */ iws.item_work_step_route_id
  FROM user_role ur,
  work_step_role wsr,
  work_step ws,
  app_step aps,
  item_work_step iws,
  item_work iw,
  item i
  WHERE wsr.role_cd = ur.role_cd
  AND ws.work_step_id = wsr.work_step_id
  AND aps.step_cd = ws.step_cd
  AND iws.work_step_id = ws.work_step_id
  AND iws.work_id = ws.work_id
  AND iws.step_cd = ws.step_cd
  AND iws.status_cd = 'READY'
  AND iw.item_work_id = iws.item_work_id
  AND iw.item_id = iws.item_id
  AND iw.work_id = iws.work_id
  AND i.item_id = iws.item_id
  AND i.item_id = iw.item_id
  AND i.deleted = 'N'
  AND i.item_type_master_cd = :b3
  AND ur.user_name = :b1
  AND aps.app_name = :b2
  AND ( iws.assignment_user_or_role IS NULL
  OR ( iws.assignment_user_or_role IN (
  SELECT ur.role_cd
  FROM user_role ur
  WHERE ur.user_name = :b1
  UNION ALL
  SELECT :b1
  FROM dual)
  AND iws.assignment_expiration_time > SYSDATE
  )
  OR ( iws.assignment_user_or_role IS NOT NULL
  AND iws.assignment_expiration_time <= SYSDATE
  )
  )
  AND (iws.pend_date IS NULL OR iws.pend_date <= SYSDATE
  )
  ORDER BY aps.priority,
  LEAST (NVL (iw.priority, 9999),
  NVL ((SELECT NVL (priority, 9999)
  FROM item_work
  WHERE item_id = i.parent_id
  AND work_id = 42),
  9999
  )
  ),
  DECODE (i.a3, NULL, 0, 1),
  NVL (iw.sla_deadline,
  (SELECT sla_deadline
  FROM item_work
  WHERE item_id = i.parent_id
  AND work_id = 42)
  ),
  i.parent_id,
  i.item_id) unclaimed_item_work_step
  WHERE ROWNUM <= 1)
  

  and for small tables, you can try adding for example FULL (your) FULL (wsr)

  It can be rewritten in a different way, but it's the fastest way to try how query will be if you rewrite it. Check the explain plan command if certain partially ordered tables are not joined because you can get the Cartesian join, it seems that it will be ok.

  View query result in the em console.

  Concerning

• query to get the wait for a sql_id (latency of IO) event

  I'm using Oracle 11.2.0.3.  and have the license pack diagnostics to access the awr / ash.

  someone there sql to get something like "Top 5 foreground timed wait event" for a SQL_ID?   In particular, I would like to know what were the events of waiting, both expected and waiting avg (ms) for a sql_id

  Something like this for that particular sql_id:

  )

  Events	Expected	Wait total (s) times	Average waiting (ms
  db file sequential read	36 895	35	1

  It is not really sensible watch ASH do this because it is sampled data - every second for V$ ACTIVE_SESSION_HISTORY and all 10 DBA_HIST_ACTIVE_SESS_HISTORY - you can't get a true picture.

  You have aggregations in the DBA_HIST_SQLSTAT and/or the AWR sql statement.

  It's expensive to save this level of granularity for sql execution unique is why you need to activate on - SQL TRACE.

• Reason for 'control file sequential read' wait?

  Hello
  
  We have a 10.2.0.4.0 2. node RAC database on Windows 2003 (all 64-bit).
  
  By looking at the 'top 5 timed events' section AWR reports (for 1 hour), we still see the 'time of CPU", as the number one event (due to our application, certain questions if all goes well in the study now by developers...), but recently I see"sequential read from the command file"as the event number two, with 3 574 633 expects and 831 time s. I was hoping to find out what was causing this high number of expectations. I started by trying to find a particular query that has experienced this expectation often, so I ran this SQL:
  

  select sql_id, count(*)
  from dba_hist_active_sess_history
  where event_id = (select event_id from v$event_name where name = 'control file sequential read')
  group by sql_id
  order by 2 desc ;

  As I hoped, the sql_id top of page returned really stands out, with an equal number of 14 182 (the next sql_id has a counter of 68). This is the text of the sql for this id:
  

  WITH unit AS( 
            SELECT UNIQUE S.unit_id
            FROM STOCK S, HOLDER H
            WHERE  H.H_ID = S.H_ID 
              AND  H.LOC_ID  = :B2 
              AND  S.PROD_ID   = :B1 
              ) 
  SELECT  DECODE((SELECT COUNT(*) FROM unit), 1, unit_ID, NULL) 
   FROM   unit
  WHERE   ROWNUM = 1
  ;

  (Ok, code a little strange, but I already have them change it.)
  
  My question is:
  
  Why / what is this code should read in the control file?
  
  
  Kind regards
  
  ADOS
  
  PS - I also checked the block number in dba_hist_active_sess_history for this sql_id and event_id p2, and it is still one of the 5 blocks in the controlfile. I've spilled the controlfile, but do not see anything interesting (even if it is true, it is the first time I've thrown a controlfile so have no idea really what to do!).

  Hello

  ADO wrote:

  WITH unit AS(
            SELECT UNIQUE S.unit_id
            FROM STOCK S, HOLDER H
            WHERE  H.H_ID = S.H_ID
              AND  H.LOC_ID  = :B2
              AND  S.PROD_ID   = :B1
  )
  SELECT  DECODE((SELECT COUNT(*) FROM unit), 1, unit_ID, NULL)
  FROM   unit
  WHERE   ROWNUM = 1
  ;
  

  This query contains a subquery factoring clause; and as it refers to the unit twice in the main part, chances are subquery factoring is to be materialized in a global temporary table in the schema SYS with SYS_TEMP_ Name% and is accessible on two occasions in the execution plan later (check presence stage of TRANSFORMATION TABLE TEMP). The step of filling of this intermediate table requires you to write in the temporary tablespace - and it's done via direct writing. Each direct entry to the segment (i.e. directly in the file on the disk) requires a data file status check - what is online or offline - that is done by access control files. So you see these expectations. This is one of the many things why subquery factoring is not good for production OLTP environments.

• get the structure of the event inside the while loop to wait for event occurs before the execution

  Hello

  I have a small problem, when I raise an event using a value change button, which works very well.  The problem is that the VI does not wait for me raise an event and instead runs the same event again, even if I have not pressed the button to start again.  The mechanical action of the button switch is released is.

  I was wondering how you get the structure of the event to wait for a user event, after that he executed the first time.

  James.Morris wrote:

  There is no reason that the event should be raised twice as much that the only way that it fires in your code is by the user by clicking on 'Hall measure only'.

  Oh yes, there is, and I deserve a kudo for this one.  Mechanical action on the button is set on the switch until published, so click to generate an event, on the bottom and on the square, attached is an example.

  My boy has my students hate this question, and to be honest, I hated it.  When never would you do that intentionally?  Honestly?  Anyway to change the button back to normal (as default latch when released) and move the terminal button in the structure of the event where it is managed and it will work as usual.

• Waiting for redo log file missing when restore main database using RMAN backup that was taken on the database physical standby

  Here's my question after tons of research and test without have the right solutions.

  Target:

  (1) I have a 12.1.0.2 database unique main enterprise 'testdb' as database instance running on the server "node1".

  (2) I created physical standby database "stbydb" on the server "node2".

  (3) DataGuard running on the mode of MaxAvailability (SYNC) with roll forward in real time 12 default c apply.

  (4) primary database has 3 groups of one-man redo. (/oraredo/testdb/redo01.log redo02.log redo03.log)

  (5) I've created 4 standby redo logfiles (/oraredo/testdb/stby01.log stby02.log stby03.log stby04.log)

  (6) I do RMAN backup (database and archivelog) on the site of relief only.

  (7) I want to use this backup for full restore of the database on the primary database.

  He is a DR test to simulate the scenario that has lost every primary & Eve total servers.

  Here is how to save, on the database pending:

  (1) performance 'alter database recover managed standby database Cancel' to ensure that compatible data files

  (2) RMAN > backup database;

  (3) RMAN > backup archivelog all;

  I got elements of backup and copied to primary db Server something like:

  /Home/Oracle/backupset/o1_mf_nnndf_TAG20151002T133329_c0xq099p_.BKP (data files)

  /Home/Oracle/backupset/o1_mf_ncsnf_TAG20151002T133329_c0xq0sgz_.BKP (spfile & controlfile)

  /Home/Oracle/backupset/o1_mf_annnn_TAG20151002T133357_c0xq15xf_.BKP (archivelogs)

  So here's how to restore, on the main site:

  I clean all the files (data files, controlfiles oder all gone).

  (1) restore spfile from pfile

  RMAN > startup nomount

  RMAN > restore spfile from pfile ' / home/oracle/pfile.txt' to ' / home/oracle/backupset/o1_mf_ncsnf_TAG20151002T133329_c0xq0sgz_.bkp';

  (2) modify pfile to convert to db primary content. pFile shows below

  *.audit_file_dest='/opt/Oracle/DB/admin/testdb/adump '

  * .audit_trail = "db".

  * full = '12.1.0.2.0'

  *.control_files='/oradata/testdb/control01.ctl','/orafra/testdb/control02.ctl'

  * .db_block_size = 8192

  * .db_domain = "

  *.db_file_name_convert='/testdb/','/testdb /'

  * .db_name = "testdb".

  * .db_recovery_file_dest ='/ orafra'

  * .db_recovery_file_dest_size = 10737418240

  * .db_unique_name = "testdb".

  *.diagnostic_dest='/opt/Oracle/DB '

  * .fal_server = "stbydb".

  * .log_archive_config = 'dg_config = (testdb, stbydb)'

  * .log_archive_dest_2 = "service = stbydb SYNC valid_for = (ONLINE_LOGFILE, PRIMARY_ROLE) db_unique_name = stbydb'"

  * .log_archive_dest_state_2 = 'ENABLE '.

  *.log_file_name_convert='/testdb/','/testdb /'

  * .memory_target = 1800 m

  * .open_cursors = 300

  * runoff = 300

  * .remote_login_passwordfile = "EXCLUSIVE."

  * .standby_file_management = "AUTO".

  * .undo_tablespace = "UNDOTBS1.

  (3) restart db with updated file pfile

  SQLPLUS > create spfile from pfile='/home/oracle/pfile.txt'

  SQLPLUS > the judgment

  SQLPLUS > startup nomount

  (4) restore controlfile

  RMAN > restore primary controlfile to ' / home/oracle/backupset/o1_mf_ncsnf_TAG20151002T133329_c0xq0sgz_.bkp';

  RMAN > change the editing of the database

  (5) all elements of backup catalog

  RMAN > catalog starts by ' / home/oracle/backupset / '.

  (6) restore and recover the database

  RMAN > restore database;

  RMAN > recover database until the SNA XXXXXX; (this YVERT is the maximum in archivelog backups that extends beyond the scn of the backup of the data file)

  (7) open resetlogs

  RMAN > alter database open resetlogs;

  Everything seems perfect, except one of the file log roll forward pending is not generated

  SQL > select * from v$ standby_log;

  ERROR:

  ORA-00308: cannot open archived log ' / oraredo/testdb/stby01.log'

  ORA-27037: unable to get file status

  Linux-x86_64 error: 2: no such file or directory

  Additional information: 3

  no selected line

  I intended to use the same backup to restore primary basic & helps record traffic and the downtime between them in the world of real output.

  So I have exactly the same steps (except STANDBY restore CONTROLFILE and not recover after database restore) to restore the database pending.

  And I got the same missing log file.

  The problem is:

  (1) complete alert.log filled with this error, not the concern here

  (2) now repeat it in real time apply won't work since the Party shall LGWR shows always "WAITING_FOR_LOG."

  (3) I can't delete and re-create this log file

  Then I tried several and found:

  The missing standby logfile was still 'ACTIVE' at present RMAN backup was made.

  For example, on db standby, under Group #4 (stby01.log) would be lost after the restoration.

  SQL > select GROUP #, SEQUENCE #, USE (s), the STATUS from v$ standby_log;

  GROUP # SEQUENCE # USED STATUS

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

  4 19 ACTIVE 133632

  5 0 0 UNASSIGNED

  6 0 0 not ASSIGNED

  7 0 0 UNASSIGNED

  So until I take the backup, I tried on the primary database:

  SQL > alter system set log_archive_dest_state_2 = delay;

  This was the Group of standby_log side Eve #4 was released:

  SQL > select GROUP #, SEQUENCE #, USE (s), the STATUS from v$ standby_log;

  GROUP # SEQUENCE # USED STATUS

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

  4 0 0 UNASSIGNED

  5 0 0 UNASSIGNED

  6 0 0 not ASSIGNED

  7 0 0 UNASSIGNED

  Then, the backup has been restored correctly without missing standby logfile.

  However, to change this primary database means break DataGuard protection when you perform the backup. It's not accept on the production environment.

  Finally, my real questions come:

  (1) what I do may not do on parameter change?

  (2) I know I can re-create the control file to redo before delete and then recreate after. Is there any simple/fast to avoid the standby logfile lost or recreate the lost one?

  I understand that there are a number of ways to circumvent this. Something to keep a copy of the log file waiting restoration progress and copy up one missing, etc, etc...

  And yes I always have done no real-time applies "to the aid of archived logfile" but is also not accept mode of protection of production.

  I just want proof that the design (which is displayed in a few oracle doc Doc ID 602299.1 is one of those) that backs up data backup works effectively and can be used to restore the two site. And it may be without spending more time to resume backups or put the load on the primary database to create the database before.

  Your idea is very much appreciated.

  Thank you!

  Hello

  1--> when I take via RMAN backup, RMAN does not redo log (ORL or SRL) file, so we cannot expect ORLs or SRL would be restored.

  2nd--> when we opened the ORL database should be deleted and created

  3rd--> Expecting, SRL should not be an issue.we should be able to do away with the fall.

  DR sys@cdb01 SQL > select THREAD #, SEQUENCE #, GROUP #, STATUS from v$ standby_log;

  THREAD # SEQUENCE # GROUP # STATUS

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

  1 233 4 ACTIVE

  1 238 5 ACTIVE

  DR sys@cdb01 SQL > select * from v$ logfile;

  GROUP # STATUS TYPE MEMBER IS_ CON_ID

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

  3 /u03/cdb01/cdb01/redo03.log no. 0 online

  /U03/cdb01/cdb01/redo02.log no. 0 2 online

  1 /u03/cdb01/cdb01/redo01.log no. 0 online

  4 /u03/cdb01/cdb01/stdredo01.log WATCH No. 0

  /U03/cdb01/cdb01/stdredo02.log EVE 5 No. 0

  DR sys@cdb01 SQL > ! ls - ltr /u03/cdb01/cdb01/stdredo01.log

  method: cannot access the /u03/cdb01/cdb01/stdredo01.log: no such file or directory

  DR sys@cdb01 SQL >! ls - ltr /u03/cdb01/cdb01/stdredo02.log

  -rw - r-. 1 oracle oinstall 52429312 17 Oct 15:32 /u03/cdb01/cdb01/stdredo02.log

  DR sys@cdb01 SQL > alter database force claire logfile 4;

  change the database group claire logfile 4

  *

  ERROR on line 1:

  ORA-01156: recovery or current flashback may need access to files

  DR sys@cdb01 SQL > alter database recover managed standby database cancel;

  Database altered.

  DR sys@cdb01 SQL > change the database group claire logfile 4;

  Database altered.

  DR sys@cdb01 SQL > ! ls - ltr /u03/cdb01/cdb01/stdredo01.log

  -rw - r-. 1 oracle oinstall 52429312 17 Oct 15:33 /u03/cdb01/cdb01/stdredo01.log

  DR sys@cdb01 SQL >

  If you do, you can recreate the controlfile without waiting for redo log entry...

  If you still think it's something is not acceptable, you must have SR with support to analyze why he does not abandon SRL when controlfile_type is "underway".

  Thank you

• I have to create the new group for waiting for redo log files?

  I have 10 group of files redo log with 2 members of each group for my primary database, I need to create new group for redo log files for the database of relief pending

  Group # members

  ==============

  1              2

  2              2

  3             2

  4             2

  5             2

  6             2

  7             2

  8             2

  9             2

  2 of 10

  If so, the following statement is correct? or nto

  ALTER DATABASE ADD STANDBY LOGFILE GROUP 1 ('D:\Databases\epprod\StandbyRedoLog\REDO01.) LOG',D:\Databases\epprod\StandbyRedoLog\REDO01_1.log');

  Please correct me if am doin wrong

  because when I run the statement I have error message saying: the group is already created.

  Thanks John

  I just found the answer

  Yes, it of recomeded to add the new group, for instnace if I have 10 group of 1 to 10, then the wait should be from 11 to 20

  Thanks I found the answer.

• What is the purpose of waiting for redo log files

  Hello
  
  What is the purpose of the log files waiting for redo in the Dr?
  
  What happens if the standby redo log files are created? or else is not created?
  
  Please explain
  
  Thank you

  Re: what is the difference between onlinelog and standbylog

  I mentioned the goal of the eve of the redo log in RD files in above thread.

  Concerning
  Girish Sharma

• WAITING FOR REDO DICTIONARY: FILE

  Hi all
  
  I'm WAITING for REMAKING DICTIONARY: NAME of FILE status
  
  SELECT STATUS FROM V$ STREAMS_CAPTURE;
  
  I tried to solve it and found that some redo log file is missing.
  Can you get it someone please let me know what could be the cause of the lack of redo log file?
  If the cause for this is that some redo log file is not saved, then how would I record?
  I have already questioned the views of data dictionary DBA_REGISTERED_ARCHIVED_LOG and DBA_CAPTURE and I have a few lines.
  
  Thank you all.
  
  Concerning
  Nick

  It must be reflected in the alerts log.

  You can use the following question as well:

  SQL > select name from v$ archived_log where between first_change # and next_change #;

• Worx mobile app for iOS - mdx file Acrobat Reader

  Hi all

  In our firm, we use Citrix XenMobile. Adobe already provides support for Android devices, but since we mainly use iOS devices, we would be very happy on a file Acrobat Reader mdx for iOS. Are there plans?

  Hello

  As far as I know, the Acrobat Reader (for Android, iOS, Windows Phone) mobile products do not understand any special support for mdx files.   Please note that each mobile operating system has different limitations and restrictions.

  You submit a feature request form?

  Adobe - feature request/Bug Report Form

  The product management team will take your request into consideration for a future release, based on data from feedback and use user.

  We are not able to speculate on any future plans for Adobe products and services online in the Adobe user forums. Sorry for the inconvenience.

• How long do you normally wait for reviewing the files?

  Hi, I'm new here and have a couple of files that have been waiting a week for review.

  So I was wondering how long it normally takes

  It is said ""thank you for your presentation, your files will be examined by the moderation team in the coming days. " "

  Thank you

  Doug

  Hello Doug,

  I found that your account has not been validated when it was created as an important step was missed. I fixed that for you so your content should be placed at the top of the queue and is discussed shortly.

  Kind regards

  Mat Hayward

• Wait for the event begins with SQL * Net message from client-time wait 178577 units

  Hello
  
  I'm watching events waiting for a request from long time in TOAD.
  I start the query on an instance of TOAD, and open the browser to log on to another instance.
  But I am surprised to see that in "TOtal expected" on the RIGHT part->
  SQL * Net message from client is the longest time and is already - > 178577 units while I just to start the query.
  
  Considering that, in the current waiting she shows DB file scattered read correctly for a few seconds.
  
  Please suggest.

  user8941550 wrote:
  Hello. No explanation for this... :-(

  Hello

  people work here, you don't know?
  I think Tom Kyte explains it well enough. This wait event is linked to your session database waiting for the guest to say to do something.

  So it is not related to the database, but to your application.
  Also as it is a wait of session event you might have had your session inactive for some time (do nothing)

  If you want to check the waiting events correctly I suggest using tkprof and start a new session in SQL more as shown by Tom Kyte in the link I posted.

  Then, run your query in sqlplus setting track and pull it out as soon as your statement is completed.
  that is to say:

  -- myest.sql
  alter session set events '10046 trace name context forever, level 12';
  SELECT ... -- your query here
  exit
  

  Run in sqlplus in this way:

  sqlplus user/password@db @mytest.sql
  

  Then check with tkprof.

  Kind regards.
  Al

• Waiting for CPU: what exactly does that mean?

  Hi all
  
  I worked on this database (11.2.0.3 on AIX 6.1) try to improve the performance of certain lots of an ERP system developed by my company. These are all processes that work very well in other environments, but here the clock times are horrible for the load and I was seeing 10% CPU, 90% CPU waiting for almost every process. This is the last section of a very long trace file where you can see the invisible "wait."
  
  I know not how to do this: if I run something in the OS with a higher priority than to Oracle, what I will get. "Lack of processor" according to me, is the name for it. My question is: what else can cause this? If the OS say that nothing was on the computer, how can I study the root cause?
  

  OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS
  
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse   762529      3.24      16.60          0          3          0           0
  Execute 8334641   5593.35   51349.14     344238    2115862   12349440     1341634
  Fetch   7048666   1142.66    5978.90     385152   58108531       2068     7944263
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total   16145836   6739.25   57344.65     729390   60224396   12351508     9285897
  
  Misses in library cache during parse: 734
  Misses in library cache during execute: 731
  
  Elapsed times include waiting on following events:
    Event waited on                             Times   Max. Wait  Total Waited
    ----------------------------------------   Waited  ----------  ------------
    db file sequential read                    620864        0.62       4858.21
    Disk file operations I/O                       42        0.00          0.00
    latch: shared pool                              8        0.04          0.06
    asynch descriptor resize                        6        0.00          0.00
    direct path write temp                          2        0.01          0.01
    direct path read temp                          94        0.03          0.57
    db file scattered read                       2129        0.44         23.90
    log file switch completion                     15        0.12          0.98
    latch: cache buffers lru chain                  2        0.00          0.00
    resmgr:cpu quantum                             15        0.00          0.03
    latch: object queue header operation            2        0.00          0.00
  
   8180  user  SQL statements in session.
    609  internal SQL statements in session.
   8789  SQL statements in session.
    288  statements EXPLAINed in this session.
  ********************************************************************************
  Trace file: dbkpv_ora_811258_ARREC_BXA_AUTOMATICA.trc
  Trace file compatibility: 11.1.0.7
  Sort options: prsela  fchela  exeela  
         1  session in tracefile.
      8180  user  SQL statements in trace file.
       609  internal SQL statements in trace file.
      8789  SQL statements in trace file.
       754  unique SQL statements in trace file.
       288  SQL statements EXPLAINed using schema:
             KIPREV.prof$plan_table
               Default table was used.
               Table was created.
               Table was dropped.
   25357662  lines in trace file.
     57345  elapsed seconds in trace file.

  marcusrangel wrote:
  don't you think that it is possible that tracing would cause such a huge head?

  Your trace file contains 25 million lines, that is a significant amount of write operations, to be compared with the information that reads one-piece 620K consume dry 4858.
  It is necessary to note that writing in the trace file leads to loss of time only when it is caused between measure of elapsed time from a visit to the database. But even if the write operation is due to the outside to measure the time of the call for a database (for example, information about a call, as FETCH #) it can be inside some call parent and will be included in the duration of the call of the mother.
  If you are interested in the details of this process, I prepare an article on this topic in my blog.

  I would therefore recommend to reproduce a similar load without follow-up.

  Published by: Alexander Anokhin on 12.07.2012 22:07

• Log writer waiting & buffer waiting for busy

  Hello
  
  Version 10.2.0.3
  
  I have a problem with a database of buffer high waits and log file sync waits top 5 events of the awr report. I noticed that recovery logs are stored in a partition of san. Not sure why they did it. Is that should store online redo logs in partition san? Please advice.
  
  Thank you
  PAVN

  In your first message hear buffer waits and log file sync waits.
  Now, you have two servers, a huge amount of e/s and nothing on buffer waits and log file sync waits a little towards the bottom of the list.

  Your IO subsystem is completely overload on server B - and it's probably because he's overloaded while updates remotely can get lock wait time (60 seconds by default, I beleve) on ServerA.

  Takes care to do much with the LOBs. In your case, it seems that you have them declared nocache logging at both ends - which helps explain the direct reading and the Scriptures.

  A few oddities - no direct visible path did not write on A - that suggests she is faced with the direct path writes using asynchronous methods, but hide the impact as a result. The other server that b shows a lot of written direct path (overloaded, perhaps not on async) AND direct bed - why re-read you LOBs on B (possibly something on the way your code is written them).

  A strategy to ease the burden - make the CACHE of the LOBs (but assign to a reasonable size RECYCLE cache or cache for a non-standard block size). If you can keep them cached for a few seconds, you will not have to make him reread you migrate them - reduce your total I/O.

  HW argument - it's a bit a classic with the LOBs (it's space allocation as the segment grows - displacement of high waters). There are a few bugs with LOBs and SAMS tablespaces that could be behind all this - check for your version of Oracle Metalink. Log File Sync - at the moment there not that much, you can do it if they are large, written on a strongly hammered system.

  Server B - too much I/O: check where it goes - maybe it's the code LOB management but seek other sources explain the db file sequential reads and read by another session - maybe you have too many readings of scattered files db passes as well.

  -Check the SQL sorted by readings and Segments by physical i/o for clues. There are probably a few heavy hitters.

  For transfer between systems (although it will probably not help) you could look on Configure SQL * Net components (SDU TDU, tcp/ip frames Jumbo, tx and rx pads) take care of pumping LOB size data through the link.

  Concerning
  Jonathan Lewis
  http://jonathanlewis.WordPress.com
  http://www.jlcomp.demon.co.UK

  "All experts it is a equal and opposite expert."
  Clarke

• waiting for redo log deleted

  Oracle 11 g 2 (11.2.0.3) Linux x86_64

  A silly mistake was made. While recreate redo standby logfiles, I managed to remove (rm command) waiting for redo log file in progress (before the end of the application) of the BONE. Now I see in the log of alerts:

  ORA-00313: open failed for members of log group 7 of thread 1
  ORA-00312: online log 7 thread 1: ..../standby_redo7.log'
  ORA-27037: unable to obtain file status
  Linux-x86_64 Error: 2: No such file or directory
  Additional information: 3
  

  What are my options at this point? I have to any cancelled transaction? The settlement seems to be moving right on the property. Where am I people?

  Thanks to you all.

  Hello

  1 ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

  2. ALTER LOGFILE GROUP 7 CLEAR DATABASE;

  3 ALTER DATABASE DROP STANDBY LOGFILE GROUP 7;

  4. ALTER DATABASE ADD STANDBY LOGFILE GROUP 7;  OR ALTER DATABASE ADD LOGFILE MEMBER '' HELPS GROUP 7;

  5. START AGAIN APPLY: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CURRENT LOGFILE USING DISCONNECT FROM THE SESSION;

  HTH

  Tobi