Why the OCR & voting disk group is maintenance name SCAN

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• Why the feature multiple column indexes using index skip scan?

  Hi all

  I have just been hired by a new company and I explored its database infrastructure. Interestingly, I see several function based indexed column used for all the tables. I found it strange, but they said ' we use Axapta to connect Axapta with Oracle, function index according to should be used to improve performance. Therefore, our DBAs create several indexes of feature based for each table in the database. "Unfortunately, I can not judge their business logic.

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  SQL > create table my_first as select '201' codeZone, to_char (100 + rownum) account_num, dbms_random.st
  Ring name ('A', 10) from dual connect by level < = 5000;

  Table created.

  SQL > create table my_sec as select '201' codeZone, to_char (100 + rownum) account_num, dbms_random.st

  Ring name ('A', 10) from dual connect by level < = 5000;

  Table created.

  SQL > alter table my_first change account_num varchar2 (12);

  Modified table.

  
  SQL > alter table my_sec change account_num varchar2 (12);

  Modified table.

  SQL > alter table my_first change codeZone VARCHAR2 (3);

  Modified table.

  SQL > alter table my_sec change codeZone VARCHAR2 (3);

  Modified table.

  SQL > create index my_first_i on my_first (substr (nls_lower (areacode), 1, 7), substr (nls_lower (account_num), 1, 15));

  The index is created.

  SQL > create index my_sec_i on my_sec (area code, account_num);

  The index is created.

  SQL > analyze table my_first computing statistics for all columns indexed for all indexes.

  Parsed table.

  SQL > analyze table my_sec computing statistics for all columns indexed for all indexes.

  Parsed table.

  SQL > exec dbms_stats.gather_table_stats (USER, 'MY_FIRST');

  PL/SQL procedure successfully completed.

  SQL > exec dbms_stats.gather_table_stats (USER, 'MY_SEC');

  PL/SQL procedure successfully completed.

  SQL > my_first desc;
  Name                                      Null?    Type
  ----------------------------------------- -------- ----------------------------
  CODEZONE VARCHAR2 (3)
  ACCOUNT_NUM VARCHAR2 (12)
  NAME VARCHAR2 (4000)

  SQL > desc my_sec
  Name                                      Null?    Type
  ----------------------------------------- -------- ----------------------------
  CODEZONE VARCHAR2 (3)
  ACCOUNT_NUM VARCHAR2 (12)
  NAME VARCHAR2 (4000)

  SQL > select * from my_sec where account_num = '4000';

  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 1838048852

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

  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). TI
  me |

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

  |   0 | SELECT STATEMENT |          |     1.    19.     3 (0) | 00
  : 00:01 |

  |   1.  TABLE ACCESS BY INDEX ROWID | MY_SEC |     1.    19.     3 (0) | 00
  : 00:01 |

  |*  2 |   INDEX SKIP SCAN | MY_SEC_I |     1.       |     2 (0) | 00
  : 00:01 |

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

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

  2 - access ("ACCOUNT_NUM" = '4000')
  Filter ("ACCOUNT_NUM" = '4000')

  
  Statistics
  ----------------------------------------------------------
  1 recursive calls
  0 db block Gets
  Gets 7 compatible
  0 physical reads
  0 redo size
  543 bytes sent via SQL * Net to client
  384 bytes received via SQL * Net from client
  2 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  1 rows processed

  SQL > select * from my_first where substr (nls_lower (account_num), 1: 25) = '4000';

  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 1110109060

  ------------------------------------------------------------------------------
  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
  ------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT |          |     1.    20.     9 (12) | 00:00:01 |
  |*  1 |  TABLE ACCESS FULL | MY_FIRST |     1.    20.     9 (12) | 00:00:01 |
  ------------------------------------------------------------------------------

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

  1 Filter (SUBSTR (NLS_LOWER ("MY_FIRST". "" "" ACCOUNT_NUM")(, 1, 15) ="4000"
  AND SUBSTR (NLS_LOWER ("ACCOUNT_NUM"), 1, 25) = '4000')

  
  Statistics
  ----------------------------------------------------------
  15 recursive calls
  0 db block Gets
  Gets 26 consistent
  0 physical reads
  0 redo size
  543 bytes sent via SQL * Net to client
  384 bytes received via SQL * Net from client
  2 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  1 rows processed

  SQL > Select / * + INDEX_SS (MY_FIRST) * / * from my_first where substr (nls_lower (account_num), 1: 25) = '4000';

  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 2466066660

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

  | ID | Operation | Name | Lines | Bytes | Cost (% CPU).
  Time |

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

  |   0 | SELECT STATEMENT |            |     1.    20.    17 (6) |
  00:00:01 |

  |*  1 |  TABLE ACCESS BY INDEX ROWID | MY_FIRST |     1.    20.    17 (6) |
  00:00:01 |

  |*  2 |   INDEX SCAN FULL | MY_FIRST_I |     1.       |    16 (7) |
  00:00:01 |

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

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

  1 - filter (SUBSTR (NLS_LOWER ("ACCOUNT_NUM"), 1, 25) = '4000')
  2 - access (SUBSTR (NLS_LOWER ("ACCOUNT_NUM"), 1, 15) = '4000')
  Filter (substr (NLS_LOWER ("ACCOUNT_NUM"), 1, 15) = '4000')

  
  Statistics
  ----------------------------------------------------------
  15 recursive calls
  0 db block Gets
  857 consistent gets
  0 physical reads
  0 redo size
  543 bytes sent via SQL * Net to client
  384 bytes received via SQL * Net from client
  2 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  1 rows processed

  Check MoS for a bug with the FBI and Skip Scan - it sounds like it could be a bug.

  On 11.2.0.4 with your sample code 10053 trace shows the optimizer whereas an index FULL scan to the point where she should consider an index SKIP scan for "unique table path".

  A person with 12.1.0.1 practice would like to run your test and see if it's fixed in this version.

  Concerning

  Jonathan Lewis

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• OCR, VOTING and SPFILE in a LUN

  DB version: 11g Release 2
  Platform: Solaris 10
  
  I understand that it is not recommended in production. But for a test installation, is it technically possible to have the OCR, voting disk and spfile in a unit number logic (all this in a single ASM disk group)?

  Max wrote:
  DB version: 11g Release 2
  Platform: Solaris 10

  I understand that it is not recommended in production. But for a test installation, is it technically possible to have the OCR, voting disk and spfile in a unit number logic (all this in a single ASM disk group)?

  Technically Yes it is possible

  See you soon

• How to identify the OCR disk, disk to vote

  Champion Hi,
  There is a confusion for the OCR and voting disk.
  Where my CAR is running and there are 3 partitions for OCR so GROSS.
  and I don't know which partition is for what purpose? How to identify them were leaving which are for OCR, voting disk?
  
  Kind regards
  Shitesh Shukla

  Hello

  try using this:
  crsctl query css votedisk
  and
  OCRCHECK
  OCRCONFIG

• Max of 15 voting disk?

  Hi all
  
  Please find the below errors:
  
  . / add css votedisk crsctl + DATA
  CRS-4671: this command is not supported for ASM starts.
  CRS-4000: added command failed, or completed with errors.
  
  
  . / crsctl add css votedisk /u01/vote.dsk
  CRS-4258: adding and deleting files from voting are not allowed because the files with voting rights are on ASM #.
  
  
  What I realized is that:
  (1) it is not possible to drive to vote in several starts as it is for OCR.
  (2) voting disk copy will be created according to the redundnacy in the Diskgroup where he is.
  
  
  No I have a few question on this basis:
  (1) if I create an external disk with redundnacy group, fact that menat that I will be having a single drive to vote? I can't add more?
  (2) oracle indicates that it is possible tor create up to 15 disks to vote.
  Does that mean I'll take a vote (15 total) on each disk drive so much that if I have a disk with normal or high redundnacy group and disk group have 15 drive with the disc in its own group faliure
  
  Maybe I'm stupid here, but if someone can advise me, please
  
  Concerning
  Joe

  Hey Joe,

  Jomon Jacob wrote:
  Hi all

  Please find the below errors:

  . / add css votedisk crsctl + DATA
  CRS-4671: this command is not supported for ASM starts.
  CRS-4000: added command failed, or completed with errors.

  . / crsctl add css votedisk /u01/vote.dsk
  CRS-4258: adding and deleting files from voting are not allowed because the files with voting rights are on ASM #.

  When votedisk is on ASM diskgroup, without adding the option available. The number of votedisk is determined by the diskgroup redundancy. If you want copies of votedisk, can be moved votedisk to a diskgroup with greater redundancy.
  Votedisk turned ASM, no available delete option, you can only replace the group with an another ASM diskgroup votedisk.
  When votedisk is the option to use EAM, is to replace.

  crsctl replace css votedisk +NEW_DGVOTE
  

  >
  >

  What I realized is that:
  (1) it is not possible to drive to vote in several starts as it is for OCR.

  Yes... because vote file is placed directly on ASMDISK not in a DISKGROUP, although it uses a diskgroup configuration (for example failgroup, asmdisks and so on).

  (2) voting disk copy will be created according to the redundnacy in the Diskgroup where he is.

  When you move to (replace) vote file ASM, Oracle will take Diskgroup configuration (i.e. failgroup) and place a single file with right to vote in each ASM DISK in different failgroups.
  >
  >

  No I have a few question on this basis:
  (1) if I create an external disk with redundnacy group, fact that menat that I will be having a single drive to vote? I can't add more?

  Yes... you don't have the notion of failgroup because you do not use mirror by ASM with external redundancy. So, it's like a failgroup. Then you can have only one file to vote in the Diskgroup.

  (2) oracle indicates that it is possible tor create up to 15 disks to vote.
  Does that mean I'll take a vote (15 total) on each disk drive so much that if I have a disk with normal or high redundnacy group and disk group have 15 drive with the disc in its own group faliure

  N ° 15 voting records is allowed if you don't store not vote on ASM. If you are using ASM the maximum number of files with the right to vote is 5. Because the Oracle will Diskgroup configuration.
  With the help of a large number of discs with right to vote can be useful when you have an environment of big cluster with (for example) 5 subsystem storage and 20 guests in a single Cluster. You must set up a file with the right to vote in each storage... but if you use a single storage 3 voting records is enough.

  Note on the use
  You should have at least three drives with right to vote, unless you have a storage device, such as a disk array, which provides external redundancy. Oracle recommends that you do not use more than 5 records of voting. The maximum number of disks with voting rights that is supported is 15.
  http://docs.Oracle.com/CD/E11882_01/RAC.112/e16794/crsref.htm#CHEJDHFH

  See this example;

  I configured 7 ASM DISK but only used ORACLE ASM DISKS 5.

  SQL> CREATE DISKGROUP DG_VOTE HIGH REDUNDANCY
       FAILGROUP STG1 DISK 'ORCL:DG_VOTE01'
       FAILGROUP STG2 DISK 'ORCL:DG_VOTE02'
       FAILGROUP STG3 DISK 'ORCL:DG_VOTE03'
       FAILGROUP STG4 DISK 'ORCL:DG_VOTE04'
       FAILGROUP STG5 DISK 'ORCL:DG_VOTE05'
       FAILGROUP STG6 DISK 'ORCL:DG_VOTE06'
       FAILGROUP STG7 DISK 'ORCL:DG_VOTE07'
     ATTRIBUTE 'compatible.asm' = '11.2.0.0.0';
  
  Diskgroup created.
  
  SQL> ! srvctl start diskgroup -g DG_VOTE -n lnxora02,lnxora03
  
  $  crsctl replace votedisk +DG_VOTE
  CRS-4256: Updating the profile
  Successful addition of voting disk 427f38b47ff24f52bf1228978354f1b2.
  Successful addition of voting disk 891c4a40caed4f05bfac445b2fef2e14.
  Successful addition of voting disk 5421865636524f5abf008becb19efe0e.
  Successful addition of voting disk a803232576a44f1bbff65ab626f51c9e.
  Successful addition of voting disk 346142ea30574f93bf870a117bea1a39.
  Successful deletion of voting disk 2166953a27a14fcbbf38dae2c4049fa2.
  Successfully replaced voting disk group with +DG_VOTE.
  
  $ crsctl query css votedisk
  ##  STATE    File Universal Id                File Name Disk group
  --  -----    -----------------                --------- ---------
   1. ONLINE   427f38b47ff24f52bf1228978354f1b2 (ORCL:DG_VOTE01) [DG_VOTE]
   2. ONLINE   891c4a40caed4f05bfac445b2fef2e14 (ORCL:DG_VOTE02) [DG_VOTE]
   3. ONLINE   5421865636524f5abf008becb19efe0e (ORCL:DG_VOTE03) [DG_VOTE]
   4. ONLINE   a803232576a44f1bbff65ab626f51c9e (ORCL:DG_VOTE04) [DG_VOTE]
   5. ONLINE   346142ea30574f93bf870a117bea1a39 (ORCL:DG_VOTE05) [DG_VOTE]
  
  SQL >
  SET LINESIZE 150
  COL PATH FOR A30
  COL NAME FOR A10
  COL HEADER_STATUS FOR A20
  COL FAILGROUP FOR A20
  COL FAILGROUP_TYPE FOR A20
  COL VOTING_FILE FOR A20
  SELECT NAME,PATH,HEADER_STATUS,FAILGROUP, FAILGROUP_TYPE, VOTING_FILE
  FROM V$ASM_DISK
  WHERE GROUP_NUMBER = ( SELECT GROUP_NUMBER
                  FROM V$ASM_DISKGROUP
                  WHERE NAME='DG_VOTE');
  
  NAME       PATH                           HEADER_STATUS        FAILGROUP            FAILGROUP_TYPE       VOTING_FILE
  ---------- ------------------------------ -------------------- -------------------- -------------------- --------------------
  DG_VOTE01  ORCL:DG_VOTE01                 MEMBER               STG1                 REGULAR              Y
  DG_VOTE02  ORCL:DG_VOTE02                 MEMBER               STG2                 REGULAR              Y
  DG_VOTE03  ORCL:DG_VOTE03                 MEMBER               STG3                 REGULAR              Y
  DG_VOTE04  ORCL:DG_VOTE04                 MEMBER               STG4                 REGULAR              Y
  DG_VOTE05  ORCL:DG_VOTE05                 MEMBER               STG5                 REGULAR              Y
  DG_VOTE06  ORCL:DG_VOTE06                 MEMBER               STG6                 REGULAR              N
  DG_VOTE07  ORCL:DG_VOTE07                 MEMBER               STG7                 REGULAR              N
  

  Kind regards
  Levi Pereira

  Published by: Levi Pereira January 5, 2012 18:01

• Disk groups creation fails

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  Hi all!
  
  I'm playing with Oracle ASM and Oracle Database 11 g R1, I am a student. It's just for testing purposes.
  
  Features of the computer are:
  Processor: Intel Pentium 4 HT 3.00 Ghz.
  Memory RAM: 2 GB.
  Hard drive: 250 GB
  O.S.: Windows XP Professional Edition SP 2.
  
  I installed Oracle ASM, I have created an ASM disk group (+ FRA), I installed Oracle Database and I created a test database. The database works correctly on the ASM disk group. Days, I got help on the initialization parameters, DB_CREATE_FILE_DEST, DB_CREATE_ONLINE_LOG_DEST_1, DB_CREATE_ONLINE_LOG_DEST_2 and DB_RECOVERY_FILE_DEST, according to their function, I created another 3 ASM (+ FILES, LOG1, LOG2) disk groups. There are four initialization settings pointing to its corresponding ASM disk group. As you can deduce, for the time of installation of the Oracle database, I used the ASM '+ FRA' disk group and inside the directories were created: CONTROLFILE, DATAFILE, ONLINELOG, fichier_parametres, TEMPFILE, and the SPFile.
  
  My point is that I want to move or migrate the DATAFILE, fichier_parametres, TEMPFILE directories and the SPFile to '+ FILES', ONLINELOG and CONTROLFILE to '+ LOG1' and '+ LOG2', in this way, the ASM '+ FRA' disk group will contain the Flash recovery area only. What is the procedure for that?
  
  Thanks in advance!

  user1987306 wrote:
  Hi all!

  My point is that I want to move or migrate the DATAFILE, fichier_parametres, TEMPFILE directories and the SPFile to '+ FILES', ONLINELOG and CONTROLFILE to '+ LOG1' and '+ LOG2', in this way, the ASM '+ FRA' disk group will contain the Flash recovery area only. What is the procedure for that?

  Thanks in advance!

  Hello

  There are two approaches that you can use, here are some
  -To move the data file, start the database in State of Mt.
  RMAN > copy datafile '+ FRA/xxx' to '+ FILES1 ";
  SQL > alter database file rename '+ FRA/xxx' '+ fichiers1/xxx. "

  -To move the temporary file
  SQL > alter tablespace TEMP add tempfile '+ FILES1' SIZE 10 M;
  SQL > alter database file temporary '+ FRA/xxx' drop;

  -To move onlinelog
  SQL > alter database add logfile Member '+ LOG1' group 1;
  SQL > alter database add logfile Member '+ LOG2' group 1;
  SQL > modify the members of database drop logfile "+ FRA/xxx."

  -To move controlfile
  SQL > restore controlfile on '+ FILES1' of '+ FRA/xxx. "
  the spfile update to reflect the new location of the controlfile

  See you soon

• Transfer data to another disk group

  Version: 10 gr 2
  Platform: Sun OS 5.10
  
  We have a database of CARS 2 knots with 4 terabyte of shared storage. Current size of the DB is only 1 TB stored in Diskgroup DATA1.
  Can I create a new disk group and move all of the data in DATA1 (1 to) to the newly created disk group?
  
  If this is not possible in 10 gr 2, is it possible in GR 11, 2?

  Hi Pete,.

  Can I create a new disk group and move all of the data in DATA1 (1 to) to the newly created disk group?

  I think the best way to do this is:

  When you add new disks in the same diskgroup, and then remove the old drives.
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  If this is not possible in 10 gr 2, is it possible in GR 11, 2?

  Yes... its possible. (if you can migrate partial data)

  http://www.idevelopment.info/data/Oracle/DBA_tips/Automatic_Storage_Management/ASM_36.shtml

  Kind regards
  Levi Pereira
  Please close your message when you get the solution to your problem.
  
  Check the answers answer 'useful' or 'right' answer which will help others with the same problem.
  
  Thank you for doing your part to make this community as valuable as possible for everyone!
  

• script to get the csv vm disk usage and export to csv format

  Hi all

  I am trying to create a script to get the use of disk for vm - space - free space and total disk space.

  I used this script that allows me to get the required result.

  but I need to edit the script for each cluster, VM he should get computers virtual cluster and check the vm disuage. and export of csv file

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  $outputfile = "c:\Diskusage.csv".

  SE connect-viserver VC-vcadmin username-password

  {foreach ($vm to $vms)

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  Viserver disconnect

  Joint the output file

  Veuileez help me in creating the script

  You can try like this?

  Connect-viserver VC -user vcadmin -password
  foreach($cluster in Get-CLuster){
      $outputfile = "c:\" + $cluster.Name + "-Diskusage.csv"    Get-VM -Location $cluster |
      Where { $_.PowerState -eq "PoweredOn" } |
      Get-VMGuest |
      Select VMName -ExpandProperty Disks |
      Select VMName, Path,
          @{Name="DiskCapacityGB";Expression={[math]::Round((($_.Capacity)/1GB),2)}},
          @{Name="DiskUsedMB";Expression={[math]::Round((($_.Capacity - $_.FreeSpace)/1MB),2)}},
          @{Name="DiskFreeMB";Expression={[math]::Round((($_.FreeSpace)/1MB),2)}} |
      Export-Csv -NoTypeInformation $outputfile}
  
  Disconnect-viserver
  

  The script creates a CSV file for each cluster.

• How to customize the location of OCR and voting disks.

  Hello

  Today I installed the first time CARS (gR 11, 2) on HP UX 11-31 with ASM. Customer wishes to place OCR and voting disks in a specific disk group.  Today during the installation, I couldn't find an option to indicate the location of the OCR and voting disk. That's why I continued with the default location and the installation is completed successfully. Now my question is

  (1) is it possible to change now?

  (2) I have a facility more tomorrow, is it possible to specify the location before you start the actual installation. Can any body tell me the way to do this?

  In parallel, I check in the net as well...

  Thank you in advance...

  Concerning

  S/N...

  Hello

  I got solutions for both of my questions... so pls ignore the same.

  Concerning

  S/N...

• OCR and voting disks (vd) are in ASM, I can stop the ASM instance?

  Hello
  
  I have two RAC nodes in the program of production installation and test setup. OCR and voting disks (vd) are in ASM, I can stop the ASM instance?
  
  -Kumar

  Hi Kumar,

  No, we can't.

  Best practice is that you need to stop the battery Oracle Clusterware on the node on which you must stop the Oracle ASM instance.

  Use "crsctl stop cluster node_name - n" or "crsctl stop crs" for this purpose.

  It could be that useful...

  Thank you
  LaserSoft