degree of parallelism and the number of files in the tablespace

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  I have two users who have problems of construction of policy models.  Don't post rule documents, no errors in OPM, but when they go to debug, their rule changes have not been picked up.  They can download and run the hub rule changes, but cannot build rules themselves.  Changes to the data model and the screens work normally.

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  Brandon, looks that we demand that the project files reside on an NTFS volume for the detection of change/update in OPM to work properly. If the project files on a network drive, or a different mounted file, system that is not NTFS based (e.g. Parallels speak directly to Mac file system?), then the kind of issues you have described may occur.

  We are not aware of a good work around for the moment. We will aim to take over these non-local Windows file system better scenarios in a next version.

  Davin.

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  Oracle 11 G R2 with node 2 RAC, ASM and Data Guard

  11.2 Solaris

  I have a Bigfile Tablespace TB 5 on Production which has a very large table containing LOB data. Most of the LOBs have been deleted so now the space used is only 200G.

  I need to recover the space (to 4.8) below the high water mark (HWM). We tried all the usual methods (shrink, move, reorg online), but due to the enormous size of the space, they are all would require to take my Production database down for many hours. Also, I have limited disk space to work with.

  In 11 G RMAN skips data file blocks that do not contain at present no data when you save to disk for a backupset.

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  1. turn the offending offline data file

  ALTER DATABASE DATAFILE OFFLINE 3.

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  First: Will this work?

  Second: When I restore this data file, it will ignore the HWM on original table space and restore just the 200 GB of data, or he will restore the 5 TB of blocks used or not?

  Thank you.

  RMAN ignores empty blocks during the backup, but restoration will create the same file size as it has been earlier and restore data later. So you will get no benefit from it.

• Recovery of the space in a file of data/tablespace in 10g

  We have a tablespace of 30 GB, made up of 15 data files of 2 GB each. However, there are only 5 GB of data in the tables within this space of tables.
  
  This occurred because the database kept growing (so the new data files have been added) until it was discovered that a single journal table occupied almost all the space. When this table was truncated, he left more space free, but "fragmented" across all 15 files given.
  
  I'm trying to reclaim the space in the data files to be able to go back to the OS (there is no reason to keep more than 7-8GB to this tablespace).
  
  From what I've read, the "alter table xxx move" command must relocate the tables to new segments to the 'before' of storage space, and then we should be able to delete the empty data in the end.
  
  However, when I run this command on a test table, nothing appears to change everything.
  
  I am running:
  
  ALTER table AAFDTCRC move;
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  However, when I ask the dba_extents table, is to show the table always distributed in different data files. I use the "alter table" command incorrectly, or is the table dba_extents not up to date with new information?
  
  Any help would be appreciated. Thank you!

  user11198894 wrote:
  Measure sizes might be a problem. Looks like that the previous data files use a size smaller than those created after measure. And I have naven can't able to find much information about what "alter table... move" when a tablespace has more than one data file. Maybe it does work in this situation?

  You will not be able to reduce the number of files in a tablespace; so if that's your goal, you will need to create a new tablespace and move objects inside. In addition, you will not be able to avoid a performance impact, unless you use the dbms_redefinition package to move tables because the MOVE command makes the unavailable table and requires you to rebuild indexes.

  There is a note that I wrote some time back - with a pointer to a helpfuil script - which gives you a few ideas of how Oracle behaves with management space with multiple files when you move objects: http://jonathanlewis.wordpress.com/2010/02/06/shrink-tablespace/

  If you want to keep the same tablespace you can try something roughly like this:
  

  
  Run my script to report on the current use of space
  Reduce as much as possible all the files
  Move objects more big are reaching the end of the files
  Repeat as necessary to step 1
  

  Concerning
  Jonathan Lewis

• Failed to remove application and the data source of AppWizard

  Hello
  
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  Edited by: user13106562 the 18.10.2010 23:32

  >
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  Every day we save 6 patterns with a total area of 80 GB.
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  But I don't know how many parallel processes should be generated and the number of files this dump file must be split?
  
  The command expdp that we plan to use
  

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  SQL > show parameter parallel
  
  NAME                                 TYPE        VALUE
  ------------------------------------ ----------- ------------------------------
  fast_start_parallel_rollback         string      LOW
  parallel_adaptive_multi_user         boolean     TRUE
  parallel_automatic_tuning            boolean     FALSE
  parallel_degree_limit                string      CPU
  parallel_degree_policy               string      MANUAL
  parallel_execution_message_size      integer     16384
  parallel_force_local                 boolean     TRUE
  parallel_instance_group              string
  parallel_io_cap_enabled              boolean     FALSE
  parallel_max_servers                 integer     32
  parallel_min_percent                 integer     0
  
  NAME                                 TYPE        VALUE
  ------------------------------------ ----------- ------------------------------
  parallel_min_servers                 integer     0
  parallel_min_time_threshold          string      AUTO
  parallel_server                      boolean     TRUE
  parallel_server_instances            integer     2
  parallel_servers_target              integer     32
  parallel_threads_per_cpu             integer     2
  recovery_parallelism                 integer     0

  resistanceIsFruitful wrote:
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  How many parallel processes you need, it's something you can figure out to run the tests against your db, but if you have parallel set to N, then you have at least N dump files in order to use fully all parallel threads spawned. We take backups using parallel = 6 and dumpfile is normally set to dumpfile=dbname.%u.dmp where oracle expands %u necessary if you do not explicitly list individual files.

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