Compensation of unused blocks

Similar Questions

• Only the unused blocks backup RMAN as well?

  DB version: 11.2.0.4

  OS: RHEL 6.6

  If I remember correctly, RMAN backs up only used blocks. I created a tablespace of 20 GB, as shown below. When I backed up, the backup piece is only 4MB in size, as shown below.

  SQL > create tablespace TEST_TS3 datafile '+ DATA_DG' size 20 G

  autoextend on

  MaxSize 32767 m

  Local extended management

  single 4 M size

  Auto segment space management;

  Created tablespace.

  SQL >

  SQL > select tablespace_name, bytes/1024/1024 of dba_Data_Files where nom_tablespace = 'TEST_TS3 ';

  BYTES/1024/1024 NOM_TABLESPACE

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

  TEST_TS3 20480

  Backup tablespace TEST_TS3 that is not used by all segments (empty)

  RMAN > backup tablespace TEST_TS3 format='/u05/RMAN_BKP/TBS_%U_%T.rmbk' tag = TEST_TS3_BKP;

  From 18 February 16 backup

  using the control file of the target instead of recovery catalog database

  allocated channel: ORA_DISK_1

  channel ORA_DISK_1: SID = 4941 instance = HMAGPRD2 = DISK device type

  channel ORA_DISK_1: starting full datafile from backup set

  channel ORA_DISK_1: specifying datafile (s) in the backup set

  Enter a number of file datafile = name=+DATA_DG/hmagprd2/datafile/test_ts3.413.904152141 00144

  channel ORA_DISK_1: starting piece 1-18 February 16

  channel ORA_DISK_1: finished piece 1-18 February 16

  piece handle=/u05/RMAN_BKP/TBS_03qu8hg2_1_1_20160218.rmbk tag = TEST_TS3_BKP comment = NONE

  channel ORA_DISK_1: complete set of backups, time: 00:00:01

  Backup finished on 18 February 16

  $

  $ ls - lh /u05/RMAN_BKP/TBS_03qu8hg2_1_1_20160218.rmbk

  -rw - r - 1 oracle oinstall 4.1 M 18 Feb 17:29 /u05/RMAN_BKP/TBS_03qu8hg2_1_1_20160218.rmbk

  But in the world of real output, size of the RMAN backups seems to be much higher.

  The following production DB is 27.5 terabytes in size as evidenced by the physical layer (DBA_DATA_FILES. Column of BYTES)

  SQL > select sum(bytes/1024/1024/1024) bytesGB from dba_Data_Files;

  BYTESGB

  ----------

  27885.3252

  But at the level of the logic layer, the used space is only 16.5 TB as evidenced by DBA_EXTENTS. BYTES column

  SQL > select sum(bytes/1024/1024/1024) bytesGB from dba_extents.

  BYTESGB

  ----------

  16621.316

  But the size of RMAN backup came to 20 terabytes , become almost 4TB that space consumed at the level of the logical layer (DBA_EXTENTS. BYTES).

  Why is this?

  RMAN jump blocks that have never been used. If a block has been used in the past, it will be included in the same backup if currently is not used:

  https://docs.Oracle.com/CD/B28359_01/backup.111/b28270/rcmcncpt.htm

  Compression for backup sets

  When you back up the data files of backup sets, RMAN can use unused block compression to skip blocks of data file. RMAN always ignores blocks that have never been used. Under certain conditions, which are listed in the BACKUP AS BACKUPSET entry in reference Oracle database backup and recovery, RMAN also ignores the blocks that are not currently used. Data file backup sets are generally smaller than copies of data file and take less time to write. Compression of the unused block is fundamental to how RMAN writes files of data in backup items and cannot be disabled.

• Logical backup RMAN containing unused blocks

  Dear Experts
  
  When I backup logic to the data file of the utility, RMAN that warn that this will be also saved all the unused blocks of datafile, so what I need to do, how to avoid this unused block to be backed up while you are taking a logical backup of data files.
  
  System in detail as follows
  
  HP Itanium server
  OS - Linux Redhet 5
  DB - Oracle10g
  
  Suggest me urgent.

  Ikram,

  No I did not lack the full result. I noticed these lines, but I don't know which are the most recent. So I took the high ones.

  For these lines, we must say that the data blocks have been used when the backup took. Maybe you populated tables with the lines of the sample and then deleted?

  I changed the query to display backups the last 3 days:

  SELECT
  (SELECT NAME FROM V$DATAFILE WHERE FILE#=V$BACKUP_DATAFILE.FILE#) DFNAME,
  DATAFILE_BLOCKS, BLOCKS,
  DATAFILE_BLOCKS - BLOCKS DIFF,
  COMPLETION_TIME
  FROM V$BACKUP_DATAFILE WHERE COMPLETION_TIME > SYSDATE - 3
  ORDER BY COMPLETION_TIME, DFNAME;
  

  Could you run this query again?

  Best regards

  Gokhan Atil

  -------------------------------------------------------
  If you answer this question, please mark appropriate as correct/useful messages and the thread as closed. Thank you

• Compensation for graphic block (JS CS3)

  Hi - I know you can erase the contents of a block of text by equating the content of the narrative frame or parent «»

  Is there a method to delete an image from a graphic block, but preserving the empty frame?

  Thanks for any help.

  Hello

  You try this js code, I hope this will help you!

  myDoc var = app.activeDocument;

  var myGrapics = myDoc.allGraphics;

  for (i = 0; i
  myGrapics [i] .remove ();
  }

  Alert ("Done");

  THX

  csm_phil

• Number of blocks of Table

  Hello

  I have a table T, and it has 30 rows.

  I put the command:

  Select

  Count (*) "number of lines"

  DBMS_ROWID. ROWID_BLOCK_NUMBER (ROWID) 'block No. '.

  Of

  t

  Group

  DBMS_ROWID. ROWID_BLOCK_NUMBER (ROWID)

  and Oracle gave me the block number 663 that all rows are in the block.

  Also, I used user_tables, dbms_space.space_usage, dbms_space.unused_space

  to check the number of used blocks and the number of unused blocks

  The result makes me confused because the number of blocks in rowid_block_number() - 1 - is different

  from user_tables, dbms_space.space_usage () - 5.

  If 5 is the correct number of blocks, why isn't the value of the empty_blocks column in user_tables 3?

  (The total in table T blocks would have the value 8, according to dbms_space.unused_space (),

  and blocks are 5, so 8-5 = 3)

  Can someone tell me the difference in the value of the blocks, free blocks and total blocks between the view and the functions?

  Thanks in advance.

  

  

  Under Oracle SAMS usually formats 16 blocks at once, but since you use the allocated system extensions the first measure is only 8 blocks so the whole extent is formatted.

  As the 1 degree in the segment, the 3 first blocks are the space management (level 1 bitmap, bitmap image in level 2, segment header) leaving you 5 blocks that are formatted and 100% free space and you have then inserted you stored in the pseudo (-) randomly selected last block of scale - leaving you with 4 blocks to 100% of free space and a partially filled block.

  Concerning

  Jonathan Lewis

• the blocks are different in dba_extents and dba_tables

  I was checking space for specific tables and found something intresting on column of blocks in different tables/views.

  In dba_tables. I checked this table is to have a block 496 according to dba_tables and 512 blocks according to dba_extents.

  Here is the code and output.

  SELECT TABLE_NAME,

  NOM_TABLESPACE,

  NUM_ROWS,

  BLOCKS,

  AVG_ROW_LEN,

  SAMPLE_SIZE,

  LAST_ANALYZED

  FROM dba_tables

  WHERE

  table_name = "DLR_DETAILS_TEST";

  output

  DLR_DETAILS_TEST

  DATA01

  32853

  496

  31

  32853

  13/03/2014 22:01:33

  And Query #2

  Select dba_extents bytes, nom_segment, blocks

  where nom_segment = 'DLR_DETAILS_TEST' and owner = 'HR ';

  output a long list and in excel I found there a total of 512 blocks.

  Just a curious question IS WHY THAT?

  OS: linux redhat 6

  DB: Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

  Thank you.

  Column of blocks in dba_segments/dba_extents show used + unused blocks. (It depends on the allocation of storage for that object).

  With AUTOALLOCATE extent management, Oracle uses the INITIAL setting to optimize the number of allocated extents. Extensions of 64K, 1 M, 8M and 64 M may be allocated.

  If your db_block_size = 8 k, then the segment with 1 shows 64 k/db_block_size measure that comes to 8 blocks. Similarly, we can calculate in other cases as well.

  Column of blocks in dba_tables show reserved blocks.

• Reused blocks?

  Hi all
  
  DB version is 10.2.0.4
  

  SQL> select num_rows,BLOCKS,EMPTY_BLOCKS,AVG_ROW_LEN,NUM_FREELIST_BLOCKS from dba_tables where table_name='FND_CONCURRENT_REQUESTS';
  
    NUM_ROWS     BLOCKS EMPTY_BLOCKS AVG_ROW_LEN NUM_FREELIST_BLOCKS
  ---------- ---------- ------------ ----------- -------------------
       29710      12470          565         538                   0
  
  1 row selected.

  I have to check whether these blocks empty are to be re-used or not?
  
  Baskar.l

  Yes, I suppose it's okay to say. Please see the demo below where I do the same thing in a tablespace MSSM

  SQL> select tablespace_name, segment_space_management from dba_tablespaces;
  
  TABLESPACE_NAME                SEGMEN
  ------------------------------ ------
  SYSTEM                         MANUAL
  SYSAUX                         AUTO
  UNDOTBS1                       MANUAL
  TEMP                           MANUAL
  USERS                          AUTO
  EXAMPLE                        AUTO
  TESTTBS                        AUTO
  MSSM                           MANUAL
  
  8 rows selected.
  
  SQL> create table t tablespace mssm as select * from dba_objects;
  create table t tablespace mssm as select * from dba_objects
               *
  ERROR at line 1:
  ORA-00955: name is already used by an existing object
  
  SQL> drop table t purge;
  
  Table dropped.
  
  SQL> create table t tablespace mssm as select * from dba_objects;
  
  Table created.
  
  SQL> exec dbms_stats.gather_table_stats(user,'T')'
  ERROR:
  ORA-01756: quoted string not properly terminated
  
  SQL> exec dbms_stats.gather_table_stats(user,'T');
  
  PL/SQL procedure successfully completed.
  
  SQL> set serveroutput on
  SQL> exec show_space('T')
  Free Blocks.............................               0
  Total Blocks............................           1,152
  Total Bytes.............................       9,437,184
  Total MBytes............................               9
  Unused Blocks...........................             118
  Unused Bytes............................         966,656
  Last Used Ext FileId....................               7
  Last Used Ext BlockId...................           2,304
  Last Used Block.........................              10
  
  PL/SQL procedure successfully completed.
  
  SQL> delete t;
  
  72653 rows deleted.
  
  SQL> commit;
  
  Commit complete.
  
  SQL> exec dbms_stats.gather_table_stats(user,'T');
  
  PL/SQL procedure successfully completed.
  
  SQL> exec show_space('T')
  Free Blocks.............................           1,033
  Total Blocks............................           1,152
  Total Bytes.............................       9,437,184
  Total MBytes............................               9
  Unused Blocks...........................             118
  Unused Bytes............................         966,656
  Last Used Ext FileId....................               7
  Last Used Ext BlockId...................           2,304
  Last Used Block.........................              10
  
  PL/SQL procedure successfully completed.
  
  SQL> insert into t select * from dba_objects;
  
  72654 rows created.
  
  SQL> commit;
  
  Commit complete.
  
  SQL> exec dbms_stats.gather_table_stats(user,'T');
  
  PL/SQL procedure successfully completed.
  
  SQL> exec show_space('T')
  Free Blocks.............................               1
  Total Blocks............................           1,152
  Total Bytes.............................       9,437,184
  Total MBytes............................               9
  Unused Blocks...........................             118
  Unused Bytes............................         966,656
  Last Used Ext FileId....................               7
  Last Used Ext BlockId...................           2,304
  Last Used Block.........................              10
  
  PL/SQL procedure successfully completed.
  
  SQL>
  
  SQL> truncate table t;
  
  Table truncated.
  
  SQL> exec dbms_stats.gather_table_stats(user,'T');
  
  PL/SQL procedure successfully completed.
  
  SQL> exec show_space('T')
  Free Blocks.............................               0
  Total Blocks............................               8
  Total Bytes.............................          65,536
  Total MBytes............................               0
  Unused Blocks...........................               7
  Unused Bytes............................          57,344
  Last Used Ext FileId....................               7
  Last Used Ext BlockId...................           1,280
  Last Used Block.........................               1
  
  PL/SQL procedure successfully completed.
  SQL> insert into t select * from dba_objects;
  
  72654 rows created.
  
  SQL> commit;
  
  Commit complete.
  
  SQL> exec dbms_stats.gather_table_stats(user,'T');
  
  PL/SQL procedure successfully completed.
  
  SQL> exec show_space('T')
  Free Blocks.............................               4
  Total Blocks............................           1,152
  Total Bytes.............................       9,437,184
  Total MBytes............................               9
  Unused Blocks...........................             118
  Unused Bytes............................         966,656
  Last Used Ext FileId....................               7
  Last Used Ext BlockId...................           2,304
  Last Used Block.........................              10
  
  PL/SQL procedure successfully completed.
  

  Aman...

• 229 lost in show_space blocks?

  exec show_space ('MY3', 'SCOTT');
  Unformatted blocks... 0
  FS1 Blocks (0-25)... 0
  FS2 Blocks (25-50)... 1
  FS3 Blocks (50-75)... 0
  FS4 Blocks (75-100)... 113
  Complete blocks... 33 449
  Total blocks... 33 792
  Total number of bytes... 276,824,064
  Total MB... 264
  Unused blocks... 0
  Unused bytes... 0
  Used in last Ext FileId... 4
  Used in last Ext BlockId... 190 729
  Used in last block... 1 024
  
  Total blocks: 33792.
  FS1 + FS2 FS3FS4 unformatted blocks complete blocks unused blocks = 01 + 0 + 113 + 0 + 33, 449 + 0 plus 33563.
  But, 33792 > 33563,
  33792 - 33563 is 229 blocks.
  where will these 229 blocks?

  Please mark the thread as an ANSWER.

• Pavilion tx1410us - error messages from the BIOS disk Test

  My first post here so greetings and a happy new year to all.

  I have a Pavilion tx1410us who seems to have a hard drive problem. I have Vista (Partition 2 - 60 2 GB as/dev/sda2) and Ubuntu 10.10 64-bit (1-1 St 20 GB as/dev/sda1 Partition) on the first partition and am getting ATA DMA error messages 2 and on the console when running Ubuntu.

  When I had Vista on the first part of the disc I was getting a lot of errors on Vista.

  I ran check disk for bad blocks, but several seem to be coming.

  Last night I ran the test of the drive from the BIOS twice and twice got them the same "Test #2-07 failure" error message. The text is perhaps not quite correct, but the "#2-07" is certainly.

  Does anyone have a reference to what the BIOS messages mean?

  With the errors appear to come from the same part of the disk that would lead me to believe that it's the hard drive itself which is a failure, but I want to be sure that it is not the disk controller until I get a new hard drive.

  It was close in the past, but we are now very careful to use only on a surface hard and keep the vents unblocked so I think I can have escaped heating problems that seem to dog these machines.

  If someone is under Linux, you can install the monitor CPU cmdlets and the temperature of the system that can sit on your desktop and show you the temperatures constantly. Very useful. Interesting to see the speed at which the processor gets hot when editing or video processing.

  Thanks in advance for any help.

  Andy

  Hi Andy,.

  The error message definetely is hard even though I'm not sure what #2 refers to other it can tell the difference between the short and complete test.  This, and the fact that more unusable blocks are appearing constantly in all point to the failure of the HARD drive.

  Best wishes

  DP - K

• HP Pavilion g6, upgrades?

  Hi, I have had this laptop for about a year now and as a music producer, I run several top software (ableton live, Audacity, etc.) and my laptop has slowed down a bit in his age, I have recently done my efforts to clense system (disk defragmentation, the compensation of unused programs, virus scans and so on) but am still not happy with my speed (this can take up to several minutes to start up ableton live as opposed to) 30 seconds it took to start when I got to the computer)
  My question is, what improvements can I make to material to improve the speed.

  an important fact:
  Processor: AMD a6 - 3420 m with radeon 1.50 GHz apu
  RAM: 4 GB
  Operating system: Windows7 64-bit

  w4ts0n wrote:

  Hi, I have had this laptop for about a year now and as a music producer, I run several top software (ableton live, Audacity, etc.) and my laptop has slowed down a bit in his age, I have recently done my efforts to clense system (disk defragmentation, the compensation of unused programs, virus scans and so on) but am still not happy with my speed (this can take up to several minutes to start up ableton live as opposed to) 30 seconds it took to start when I got to the computer)
  My question is, what improvements can I make to material to improve the speed.

  an important fact:
  Processor: AMD a6 - 3420 m with radeon 1.50 GHz apu
  RAM: 4 GB
  Operating system: Windows7 64-bit

  Hello

  G6 is not a high performance like the Envy etc. series laptop. Intel based laptop would be a better option for a music producer, but with the system now all you can do is to put more in. memory 8 GB would be enough (2 x 4 GB) and replace the original with a SSD hard drive. A replacement of the CPU may be possible, but I don't know which model it is and can't say anything for sure. However, I recommend to sell and buy a laptop at least Sandy based Intel or Ivy Bridge.

• Help understand about values retrieved by Tom Kyte script for my LOB segment

  I have the LOB segment. When I use Tom Kyte show_space script

  ()https://asktom.oracle.com/pls/apex/f?p=100:11:0:P11_QUESTION_ID:14339684180676) have this output:

  Unformatted blocks...             107

  FS1 Blocks (0-25)...               0

  FS2 Blocks (25-50)...               0

  FS3 Blocks (50-75)...               0

  FS4 Blocks (75-100)...               0

  Complete blocks...         859 438

  Total blocks...       1 746 304

  Total number of bytes...  14,305,722,368

  Total MB...          13 643

  Unused blocks...               0

  Unused bytes...               0

  Used in last Ext FileId...               5

  Used in last Ext BlockId...       1 261 056

  Used in last block...             128

  I have only full blocks = 859 438, but Total of blocks = 1 746 304 why so?

  Looks like you chunk's size 16 k - Oracle seems to watch only the headers of piece in this code; so you expect the segment number raw blocks to be twice the space 'blocks', as this report if you are using a size of 8 KB block and a fragment of 16 k size.

  Concerning

  Jonathan Lewis

• Hi people. IM new here. Need to accelerate a clarification on the table!

  We have a scheme of production with 200 ~ tables in my body and I feel the performance of important queries in reports can be increased up to with the approach below.

  Current settings - movement of the line is disabled for all tables.

  What I can,

  (1) to activate the movement of the line with "change the movement line of table_name enable;" ~ This allows the rows in the table to move dynamically remove the unused blocks.

  (2) remove the unused blocks with "alter table table_name retractable space;"

  (3) turn off the movement of the line with "modify the movement table table_name disable;"line ~ this will stop allowing the lines in the table move dynamically.

  If I do, I get free unused blocks or removed making the table to perform at least a little more fast?

  Will there be an impact elsewhere?

  PS - It was never tried before by someone else in our scheme of production.

  See you soon,.

  Rachida.

  India.

  Use the Segment space Advisor to see what are the tables could benefit from a SHRINK

  Hemant K Collette

• compressed backup size differ between the band and hard drive

  It is out of curiosity.

  11.2.0.3 EE on OEL 5.6 DB (64 bit) + Compression Adv.

  TSM for MML

  The disc and sbt_tape are configured for compressed backupsets

  compression algorithm is set to 'HIGH '.

  If I backup to disk, it takes 1.5hrs and produces a backup 10 GB piece.

  If I backup to tape, it takes 5 hours and produced a 27 GB backup piece.

  I look at 'top', it seems that 1 core working 100% with the majority of which (> 90%) being "user" (that's to say not i/o-bound or wait)

  (part of the 10 GB backup tape backup takes < 2 min over a link to 1GigE)

  Has anyone else seen this type of difference in size when they perform a compressed disk vs. tape backup?

  Is this supposed to happen?

  Should I be worried?

  Thank you very much for any information.

  MK

  After several Reading the Famous Mwill integrate, it seems that "compression unused block" is shot in for the DISCS.

  RMAN backup concepts

  So, Yes.  An algorithm different is used between the DISCS and SBT_TAPE.

  MK

• Imported OVF resizing problem

  Hi, I exported a centos as a template OVF guest whose size was 72 GB. Later, I imported OVF even that have removed domain emails and files (such as the server is a server hosting) and I found that the new drive size is about 6 GB. While I tried to export this comment 6 GB server, I found get exported OVF 72 GB of the same size. Why this comment less size exported the same size? Very well, any suggestion of resizing would be confiscated.

  You can 'cleansing' of the partition of the OS for example the unused blocks zeroeing before exporting the OVF... Take a look at http://blogs.vmware.com/vapp/2009/10/delta-disk-support-in-ovf.html (section "Narrowing of the disc"), which provides some clues.

  André

• ESXi 5.1 VM running extremely slow after a power failure

  Help, our virtual machines are run at a crawl since a power outage a few days ago. Everything seems to be in good shape.

  Host is DL385 G7, 12 Dual core AMD, 48 GB memory, data store local storage (4) SAS 600 GB is running in RAID 10 for a total of 1.2 GB

  Where I even begin to start looking?

  4 critical VM:

  Domain controller - Server 2008

  SQL Server - 2008 Server

  Terminal Server - Server 2008 R2

  Mail Gateway - Windows 7

  3 other various OS VM:

  Windows XP

  Server 2008

  Linux power virtual management appliance base.

  I turned off these 3 for now hoping to free up resources (doesn't help anything).

  Memory and CPU use is nothing more than normal. It is sufficient that the virtual machine is so slow to the point where they are almost unusable (block-by-block refresh screens)

  Each client computer is a thin client, and they often lose communication for 10-20 seconds each time, I do not know due to timeouts.

  If the screenshots of the content of the folder of the virtual machine, or anything else would be helpful, let me know.

  Hello

  Everything seems to be in good shape.

  Check the status tab material on the host and the status of all sensors...

  On a host that unmanaged-> Configuration tab - > material - > health

  Then, you can take a look at log files and search for:

  error, warning, fault, panic, trace... "events".

  For ESXi host:

  /var/log/VMkernel.log

  /var/log/vobd.log

  VM log file:

  VMware.log - in the same directory as the files of the virtual machine

  If it is possible to download...

  If you are unable to find anything suspicious in the newspapers using ESXTOP next level...

  For troubleshooting with ESXTOP discover these excellent sources:

  http://www.yellow-bricks.com/ESXTOP/

  Esxtop statistical interpretation

  http://www.VMworld.NET/WP-content/uploads/2012/05/Esxtop_Troubleshooting_eng.PDF

  See also:

  VMware KB: Troubleshoot ESX/ESXi virtual machines performance issues

  VMware KB: Troubleshooting problems of network in a vSphere environment performance

  VMware KB: Determine if the VM and ESX host blocking problem is caused by hardware issues

  VMware KB: Performance high on Windows virtual machines network latency or poor network

  VMware KB: Performance of local storage of the poor for VMware ESXi/ESX troubleshooting controller

  VMware KB: Using esxtop to identify problems of performance of storage to ESX / ESXi (several versions)

  Performance - main list links

  Kind regards

  P.