alter table shrink space! ~ help!

Similar Questions

• ALTER TABLE SHRINK the SPACE COMPACT takes a long time

  Hello
  I run:
  ALTER TABLE TOM. TAB1 SHRINK SPACE COMPACT;
  ALTER TABLE TOM. TAB1 SHRINK SPACE WATERFALL;

  
  The "ALTER TABLE TOM. Tab1 SHRINK SPACE COMPACT"was completed in 2 hours, but"ALTER TABLE TOM. Tab1 SHRINK SPACE WATERFALL"is still underway after 8 hours, less than the size of the table TAB1 and index:

  NOM_SEGMENT... GB
  TAB1................................. 166
  IDX01................................ 83
  SYS_C00......................... 42
  IDX02............................. 142
  IDX03.............................. 66
  IDX04............................. 122

  
  Why 'SHRINK the SPACE COMPACT' takes a lot of time?
  Is it possible to check how much time should I take?

  Thanks in advance!

  Running

  ALTER INDEX TOM. TAB1_IDX03 SHRINK SPACE COMPACT;

  ALTER INDEX TOM. TAB1_IDX03 SHRINK SPACE;

  set is useless, as does 'SHRINK the SPACE' that means "SHRINK SPACE COMPACT" and much more (see the quote from the Doc Oracle Hemant).  2, 'SHRINK the SPACE' is the operation that will take more time.  So if 'SHRINK the SPACE' is what you wanted (reclaim space) and you can afford to wait, run 'SHRINK the SPACE' only.

  "SHRINK the COMPACT SPACE" is a part of the work that 'SHRINK the SPACE' is only.  Generally, use you it when time is at a premium: you run SHRINK SPACE COMPACT a weekday evening (because SHRINK the SPACE does not fit in one night and accrue hourly) and you run SHRINK SPACE on the weekend to finish following the recovery of your space.

  Regarding the fact that the entire segment or a partition after another, I have no experience - I both of their time and test methods.  Perhaps running several sessions at the same time on different partitions would save time (but be more heavy on the CPU and storage).

  Also note that SHRINK the AREA generates a lot of REDO (keep an eye on the free space of your ARCHIVELOG destination).  With your data volume, I would expect dozens (or even hundreds) of gigabytes of roll forward must be generated.

• ALTER table move & shrink space

  Hello
  What is the difference between alter table move and alter table shrink space orders
  Two free blocks not used in the table so that the free space will be given to the tablespace. Can you explain mw in detail or provide some links

  Sekar_BLUE4EVER wrote:
  Hello
  What is the difference between alter table move and alter table shrink space orders
  Two free blocks not used in the table so that the free space will be given to the tablespace. Can you explain mw in detail or provide some links

  ALTER table move would make invalid indexes and would require so rebuild you the index. In addition to him, it requires extra space in the tablespace, even that would be used for the creation of the object in double. So if you have a table of 10 GB, you need additional 10 GB free todo table alter move. Whereas in the narrowing is a place, the online operation, does not make you go and rebuild the index because it doesn't make them not disabled, requires no additional space to have.

  HTH
  Aman...

• ALTER table a enable row movement cause problem

  Hello
  
  I did allow the movement of the row in the table and then shrink the space. which causes the performance issue? If so, how? How to allow the movement of the line and shrink the work of space internally?
  
  can deposit in full table scan, then the idexes on this table is not used more?

  947721 wrote:

  can shrink space available internally to what extent?

  Use the following syntax in a google search: alter table shrink space site: docs.oracle.com

  Note, by the way: "allow the movement of the line" allows you to take advantage of the features of line-movement, but he made no movement.

  Concerning
  Jonathan Lewis

• ALTER TABLE RETRACTABLE is possible online?

  RDBMS Version: 11.2.0.4

  Platform: Oracle Linux 6.4

  We have a database of CARS of Production 2 nodes very critical. To recover the space, we want to cut some large tables. The first table we'll shrink is a 300 GB, which is not partitioned with no LOB table.

  Here are the steps that we'll run.

  Step1.alter mytable table allow the movement of the line;

  Step2.alter mytable table shrink space compact;

  Step3.alter mytable table shrink space;

  Step4.alter table mytable disable the movement of the line;

  STEP 5. COLLECT STATISTICS of the table (because the RETRACTABLE table will cancel all the sliders in the shared pool)

  The steps above will take at least 10 hours to complete a 300 GB table. We would like to know if all of these steps can be done online. That is to say. We do not want the SHRINK command to lock the table and prevents the table to be modified (any DML) by the application

  Doc below said this can be done online. But, MOS DOC 1357878.1 said that it is not and you must use the DBMS_REDEFINITION package if you want to do it online.

  https://docs.Oracle.com/CD/E18283_01/server.112/e17120/schema003.htm

  The MOS article you are talking about is not correct. Outside the DOF at the end of a SHRINK lock when the high tide is shifted, SHRINK the SPACE is an online operation. DBMS_REDEFNITION is actually worse because you have DDL locks at both the beginning and the end. However, in both cases, it is the DDL that is blocked by other operations DML (and not the other way around) so that your users will have no problem. If the narrowing or the redefinition is blocked, you can suspend the database for a few seconds. I described how to do here,

  Database Quiesce

  --

  John Watson

  Oracle Certified Master s/n

• HWM, shrink space and datafile resize

  Hello world

  
  

  After deletion of lines in the middle of the table, I guess that HWM decline.

  If I do after that:

  alter table t shrink space

  the HWM decrease?

  Second question:

  When I try to decrease a size of data file, I get this error:

  ORA-03297: file contains data beyond the requested value of RESIZING

  
  

  What is the cause of this error?

  Is the sollution to shrink the space of all objects in the data file?

  
  

  Thank you
  

  Hello

  check the below:

  How to adjust the high watermark in ORACLE 10 g & #8211; ALTER TABLE SHRINK | Lutz hartmann as sysdba

• Reclaim space after ALTER TABLE DROP PARTITION

  Hello
  
  I have a partitioned table. My requirement is to reclaim the space by dropping a partition of the table.
  
  Is it possibe to recover space for the tablespace by dropping a partition of partition table?
  
  Thank you

  Hello

  ALTER TABLE DROP PARTITION will always return the space to the storage to be reused by other segments.

  It's the ALTER TABLE TRONQUER SCORE, where you can specify DROP STORAGE or of REUSE STORAGE clause (in case of re-use, the space is not released and can be used by the new lines inserted in the same partition). The DROP STORAGE should be the default option.

  But for the fall of the score, you don't have to worry.

  Kind regards
  Martin

• DEALLOCATE UNUSED and SHRINK SPACE

  Hello
  What is the difference between the effect of DEALLOCATE UNUSED and SHRINK the SPACE?

  ALTER TABLE mytable DEALLOCATE UNUSED;
  ALTER TABLE mytable SHRINK SPACE;

  ahmedbaraka wrote:
  Hello
  What is the difference between the effect of DEALLOCATE UNUSED and SHRINK the SPACE?

  ALTER TABLE mytable DEALLOCATE UNUSED;
  ALTER TABLE mytable SHRINK SPACE;
  

  The SQL reference for 10.2 manual...

  deallocate_unused_clause

  Use the deallocate_unused_clause to explicitly release the unused space at the end of the table, partition or subpartition, segment overflow data, segment of LOB data and LOB index and make space available for other segments in the tablespace.

  shrink_clause

  The retraction clause allows manually shrink the space in a table, table arranged according to index or its overflow segment, index, partition, subpartition, LOB segment, materialized view, or newspaper materialized view. This clause is valid only for the segments in the tablespaces with automatic segment management. By default, Oracle database compact segment, adjusts the HWM and frees the space recovered immediately.

  Compaction of the segment requires the movement of the line. Therefore, you must enable the movement of line for the object you want to cut before you specify this clause. In addition, if your application contains the rowid-based triggers, you must disable them before issuing this clause.

  Or condense the above:

  DEALLOCATE - simply releases unused space at the end of the segment; don't move not any data

  Shrink - shrink space in a segment - requires line movement.

• ALTER table drop column is too slow on the big table

  Hi all
  the user has run after a command in oracle 10 G: - >
  ALTER table < table name > Delete column (< cloumn list >); table in question is of a size 41GB.
  
  the results of the command to cancel space filled.
  Tips of even trace file cancel segemnts.
  
  query failed for hours.
  Why cancel is linked to this
  and what would the resolution for this.
  
  Unused help set...
  
  
  Thanks in advance,
  Rock

  Would it be useful to assign unused columns?
  What about dbms_redefinition?

• "Querying volume for available shrink space" does not

  I tried to create an empty partition on my 500 GB drive C (which I still have more than 350 GB free) to be able to dual boot another OS next to my already installed Windows 7 Ultimate 64-bit, but I encountered a problem from the beginning. While trying to shrink the space on drive C for the partition, the computer management hangs on 'Volume mark for available shrink space' for about a minute, and then said computer management "not responding". I have retried several times, and I still have the same result. I tried running "sfc/scannow" as administrator CMD, but there is no problems found. Afterwards, I checked errors on drive C, but the result is always the same. I don't know how to go further with this problem. Any help would be greatly appreciated...

  Here are a few options:

  • Use a third-party disk manager, or a commercial (e.g. Acronis DiskDirector) or one that is free.
  • Use diskpart.exe in a command prompt if you are comfortable to work at this level. It might give you a more explicit feedback. Here is what you would see:

  d:\>Diskpart
  Microsoft Corporation.
  On computer: ACORN

  DISKPART > select disk 0
  Disk 0 is now the selected disk.

  DISKPART > detail disk
  Crucial_CT512MX100SSD1 ATA Device
  . . .
  Volume # Ltr Label Fs Type size status Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Healthy Volume 1 c System NTFS Partition 68 GB system
  Sound data 2 D NTFS Partition 97 GB Pagefile volume
  Volume 3 e drivers NTFS Partition 310 GB healthy

  DISKPART > select partition 3
  Partition 3 is now the selected partition.

  DISKPART > retractable help

  (read the help text)

  DISKPART > shrink Desired = Minimum 150 = 100

  DISKPART > exit

• Stuck computer management on the volume of queries for available shrink space, please wait.

  I'm trying to reduce my Windows 7 partition but the computer management tool is stuck on "volume volume queries for available shrink space, please wait". I used to have a Linux installation on it earlier and I uninstalled it properly, but Windows still work, so that could be the problem. Anyone have any ideas?

  I don't know if l could help but try the system, sfc file Checker

  http://www.SevenForums.com/tutorials/1538-SFC-SCANNOW-Command-System-File-Checker.html

  And after doing so clean the PC boot to see if you can access disk management

• ALTER table move online in an encrypted tablespace

  Hello

  Our DBA want to put all our data in encrypted storage.

  Once they create encrypted tablespaces, we will have to do «alter table move online...» "orders for encrypted storage space around the tables.

  Has anyone here done already?   Keeps the table moved really 'on-line' (available at query/insert/update) during the move?  Or will we have to wait some time stop/downtime while the tables are moved?
  What about the tables with long or CRAFT?

  Thank you!

  KSandberg and to add to the recall of John that only ITO tables can be moved online, if the table needs to be moved offline the indexes would be invalid until rebuilt.  If the table is an IOT I suggest you rebuild the index online after the move because even if the indexes are always used the logical ROWID is more pointing to the correct location and access of the index will be less effective that will you rebuild the index.

  - -

  The dbms_redefinition package could be an alternative solution if you need to move the tables no - ITO online.

  - -

  HTH - Mark D Powell.

• ALTER table, if not amended

  Hi, thank you very much in advance. How to add columns to a table only the columns not yet existed.

  ALTER table

  table-name

  Add

  (

  column1_name column1_datatype column1_constraint,

  column2_name column2_datatype column2_constraint,

  column3_name column3_datatype column3_constraint

  );

  
  

  If column1_name does not exist I have add the column in table_name. Otherwise, do not add the column.

  
  

  Best regards, ib
  

  Here the case, I give my client a script and if they add columns or not, I don't know. So, I want only the columns are added to the case where they do not exist. The script includes other ddl and dml so I don't want a mistake due to the change table make the script error. Thank you.

  Sorry-, you will have to wait for someone else to help.

  Just, that makes NO sense to me. If you are unsure when columns are added to a table, then you have lost ALL control over your data model. You can possibly write, test, or deploy code that uses tables and columns without knowing which columns a table has.

  You should just use separate scripts for these tables of problem so that if the script didn't it won't affect other scripts.

• ALTER table order by

  Dear Sir
  
  Could someone help, I created a table with the increase of records of tests (test_id)
  I want to have test_id on descending in to not have to click desc order all the time at the opening of the table to insert a new record.
  
  the query
  
  ALTER table test_cases test_id desc order gives me following error: invalid alter table option...
  
  
  Thank you

  845498 wrote:
  Dear Sir

  Could someone help, I created a table with the increase of records of tests (test_id)
  I want to have test_id on descending in to not have to click desc order all the time at the opening of the table to insert a new record.

  the query

  ALTER table test_cases test_id desc order gives me following error: invalid alter table option...

  Thank you

  A table is a SET of data. Relational databases have been designed originally based on the principles of mathematical sets of information and this is what SQL design and database is based on, so why we have operations such as UNION and LESS etc. Data sets do not have a prescription for them, they are just data. If you want an order of your data, you must specify an ORDER BY clause in your query, or if you use a type TOAD etc. the GUI interface allows you to choose the desired order (which is just apply an ORDER BY clause to the background)... and with the TOAD, he remembers your preference for each table in the schema for the future. Other tools may or may remember preferences.

• Generate the DDL - change is a new column and I want to generate an alter table.

  All, morning
  
  I searched and searched all over the Data Modeler and I can't find this option... but I found it easily in the designer.
  I hope you can help me.
  
  V3.0.0.665 SQL Developer Data Modeler.
  
  I added a new column to a table, and when I generate the DDL I wish it were an alter table add column rather than a table to create.
  This feature is in the designer, so I think it would be in the Data Modeler.
  
  Just in case my description isn't clear, here are the high level steps, then it is clear.
  
  1 create logic model
  2. create the relational logic.
  3. create the physical relationship.
  4 generate the DDL and run in the database. At this point, I'm going to production with my system, and all right.
  5. at this point, we have an enhancement request. For the model, it will be a new column in a table.
  6. update of the logic model.
  7. relational update logic
  8 physical update of relational
  9 generate the DDL. Here, I would have generate it know that it needs to generate an alter table add column and does not create the table.
  This is something I do a lot as all my models are in production. I can't find how to do this step to get data Modeler to generate the altar.
  Designer done exceptionally well.
  
  Quite often, it is more than a single column. Changes can be many and made over time and at the time of generating the DDL you remember not every single amendment. To have the tool discover these changes for you and generate the appropriate DDL is a feature that I consider as very high.
  
  I hope that is clear and you can help me.
  
  See you soon
  Chris...

  Hi Chris,

  you need to compare your model on database - database relational model even import and use the option 'swap target' - in this case 'expressions of alter' against the database will be generated.
  You can watch demonstrations here http://www.oracle.com/technetwork/developer-tools/datamodeler/demonstrations-224554.html
  It would probably be more useful http://download.oracle.com/otn_hosted_doc/sqldev/importddl/importddl.html
  Sooner or later your changes will require the table to be recreated, and you will need to backup your data - you can consider using the 'Advanced DDL' option - script is generated that will land your table content (including LOBs) to the system of files accessible from the database and restore after changes. Well not try directly on the production system :).

  Philippe