Oracle Free Space Management

Is Free Space Management a Initialization Parameters,
if so which one,
Where is Free Space Management keepth ?
Eric

Eric, Free space management is not a database parameter. You should read the Concepts manual. It explains Tablespace management and object management basics. Or you can see the chapters devoted to Tablespace and Object management in the DBA Administration Guide for a more detailed analysis.
To find free space in the database see the dictionary view: dba_free_space.
To how space management is handled for a tablespace see the dictionary view: dba_tablespaces.
HTH -- Mark D Powell --

Similar Messages

I have question on Oracle 9i space management.

When I create a table.
Table A
field1 INTEGER
field2 Date
field3 Double
field4 VARCHAR2(30)
field5 Number(8).
The question is, when field3 and field5 is NULL/Blank. Does Oracle allocated the space for the record even when field3 and field5 is blank or null?
Thanks so much.

But you had used the term when asking about the space taken to store columns. I just wanted to make sure people understood the true question was space to hold null column values and not the row.
When discussing tables Tuples and rows are correct terminology but the use of records is poor terminolgy. You have rows in your tables and records in your program files though attention to terminology isn't what it once was.
-- Mark D Powell --

How SMON coalesces free space in oracle 9i and 10g

how SMON coalesces free space in oracle 9i and 10g?
Is it doing same as it was behaving in oracle 7 like looking through free extent table every five minutes (sys.fet$) to see if there are any adjacent free extents that can be coalesced into a single extent, and on every 25th cycle (i.e. every two hours and five minutes) it looks at the segment table (sys.seg$) to see if there are any temporary segments that need to be eliminated, as explained by jonathan lewis?
what are extent and segment tables available in oracle 9i and 10g like sys.fet$ and sys.seg$ in oracle7?

>
how SMON coalesces free space in oracle 9i and 10g?
Is it doing same as it was behaving in oracle 7 like looking through free extent table every five minutes (sys.fet$) to see if there are any
adjacent free extents that can be coalesced into a single extent, and on every 25th cycle (i.e. every two hours and five minutes) it looks
at the segment table (sys.seg$) to see if there are any temporary segments that need to be eliminated, as explained by jonathan lewis?
what are extent and segment tables available in oracle 9i and 10g like sys.fet$ and sys.seg$ in oracle7?I think you need to go and have a look at the Oracle 9i documentation here
http://www.oracle.com/technology/documentation/oracle9i_arch_901.html
and automatic segment management in 10g
http://www.oracle.com/technology/pub/articles/10gdba/week15_10gdba.html
HTH.
Paul...
Software - OS (+ version), Server,
Hardware - CPU + Disk configuration.
Please include all of the above information with database queries.
This will help those who are trying to help you!
Furthermore, please do not top-post and do try to trim your replies!

Free space requirement in Oracle database

In my oraganization SAP application running with oracle as database. now our database is 1300 GB and right now 90 GB space free in database (92 % used). since System implementation we kept this free space upto 90GB by adding datafiles every week. I am newbie and want to know that how much free space oracle requires for better performance. can I stop adding datafile .

user8694422 wrote:
But in SAP application,SAP has its own intelligency for database monitoring. we only add datafile in database for its space management.Now there is no space in our file system to add any of the datafile. In database 90GB out of 1300GB free. so what happen if database growth furher? database will get hang?I am not sure at all what SAP recommends but there isn't any thing that says that X amount of space should be left free. Oracle has come out with the alert mechanism that can help you to get the alert when the free space goes below the specified limit that you mention but more than the performance, it's the availability IMO that's going to be effected. For example, if you have run out of space, you won't become more slow or faster but you won't have space to do any further writing and that's going to cause the operations to be halted as long as you won't solve the issue by adding more space or by adding new files. So , saying that database would hang would be incorrect, not operational, yes!
Just my 2 cents
Aman....

Free space problem in / with oracle-xe-11.2.0-1.0.x86_64

Hi,
I'm trying to install Oracle-xe-11g on Red Hat 5.6, but I have the following problem:
[root@localhost] rpm -ivhf oracle-xe-11.2.0-1.0.x86_64.rpm
Preparing... ########################################### [100%]
installing package oracle-xe-11.2.0-1.0.x86_64 needs 180MB on the / filesystem
However I have enough free space in /, df command shows:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 3960348 3326380 429544 89% /
/dev/sda3 30368632 4066116 24734976 15% /home
/dev/sda1 46633 11310 32915 26% /boot
tmpfs 2198372 0 2198372 0% /dev/shmHow do I fix it?
Thank you in advantage
Edited by: 905637 on 03-ene-2012 4:43

How do I fix it?Add Space.
Looks like you've got a less than 4G total for / with about 420MB free. That's nowhere near enough space, out-of-the-box the datafiles alone take about 1G.
Try bumping sda2 up another 4G, or add a (at least) 4G partition and mount it at /usr/lib/oracle
Per the Linux install guide ... "Disk Space ... 1.5GB minimum" http://docs.oracle.com/cd/E17781_01/install.112/e18802/toc.htm#BABHICJH
Edited by: clcarter on Jan 3, 2012 11:40 AM
add install doc URL

Oracle 11g - How to repair block corruption(on free space) in datafile

Hi,
I have a tablesopace with 3 datafiles, out of which one datafile has corrupted block. But no objects or data is affected as the corrupted block os in free space. This was shown in the alert logs.
Please see below the details:
Wed Apr 06 15:30:04 2011
SMON: Restarting fast_start parallel rollback
SMON: ignoring slave err,downgrading to serial rollback
ORACLE Instance geooap (pid = 12) - Error 1578 encountered while recovering transaction (10, 6) on object 149755.
Errors in file f:\oracle11g\diag\rdbms\geooap\geooap\trace\geooap_smon_5540.trc:
ORA-01578: ORACLE data block corrupted (file # 7, block # 54053)
ORA-01110: data file 7: 'F:\ORACLE11G\ORADATA\GEOOAP\ORDER_DATA_01.DBF'
GEOAP:
Fri Apr 01 14:57:48 2011
Errors in file f:\oracle11g\diag\rdbms\geop\geop\trace\geop_arc1_2156.trc:
ORA-00235: control file read without a lock inconsistent due to concurrent update
Fri Apr 01 14:57:58 2011
================================================================
The corruption is being reported in a free space block of the ORDER_DATA_01.DBF.
I’ve checked all the tables (and indexes) in this tablespace and none report corruption.
=====================================================Is there any action I need to take to remove corruption at this point?It is not affected any operation on the database yet.
What is the best way to do get rid of the corrupt block, without dropping and rebuillding the full tablespace(which is around 6 GB -total of 3 datafiles)
Thanks a lot

Can RMAN recover the datablock from this cold backup(which is a week old, the data file was not corrupted then) ?Please note that to do the recovery, you would need the backup and the archivelog files since the backup. Think about what you are asking to do. Its a single block whose recovery you are asking from a week old backup which obviously would be on an much older SCN compared to the rest of the database. How would you make that block consistent with the rest of the datafile. If you don't have archivelog in that db whose block is corrupted, you may forget that block and any data that it might ever had. Also, please read the documentation about the block recovery which explains the requirements very clearly,
http://download.oracle.com/docs/cd/E11882_01/backup.112/e10642/rcmblock.htm#BRADV89784
From the above link, 1st point,
The target database must run in ARCHIVELOG mode and be open or mounted with a current control file.HTH
Aman....

Retrieving free space in oracle 8i

hi,
i am having 30 gb oracle 8.1.7.2 database. by the weekend we are gonna purge around 60% of data from it. we want to use the freed space for new object. the downtime avaiable for app. is very less. so we can't go with exp/imp to retrieve free space. is it possible to do it some other way because i am having a doubt that oracle 8i does not release the space freed by deletion of recording for creating new objects. please help.

Hi,
In order to do that you can use 2 methods:
1/ CTAS
. CREATE TABLE new AS SELECT * FROM old WHERE <lines_to_keep>
. DROP TABLE old;
. ALTER TABLE new RENAME TO old;
2/ Purge data as you whish
. DELETE FROM tabname ... ;
. COMMIT;
. ALTER TABLE tabname DEALLOCATE UNUSED;
HTH,
Yoann.

Solaris volume manager ; finding free space

Hello
Is there a way to find out the space available in a metadevice for creating new soft partions?
I am looking for the equivalent of the following vxvm commands
vxdg free
vxassist maxsize
Thanks in advance

If it is indeed showing as free space have you tried just extending your existing volume instead of making a new one?
You can right click your existing volume in disk manager and say extend partition and just next through the wizard. It should auto set all the values to consume is all the space.
Option 2 is to use the command line utility called diskpart. Go to start, type cmd. After the command prompt is open you will type diskpart.
First list the disks by typing "list disk" then select the disk you wish to work with. Example "select disk 1".
Then list the volumes, similar to disk you do "list volume". You then select the desired volume you want to extend. Select the 58.8 GB volume similar to selecting the disk. After the volume is selected you will type "extend" and
it will grow the volume into the free space.

SGA free space information in Oracle 7.3.4

Please help me how to find SGA free space information in Oracle 7.3.4

Hi, I am getting following error while running below query
SQL> select * from v$sgastat order by pool,name;
select * from v$sgastat order by pool,name
ERROR at line 1:
ORA-00904: invalid column name

Free Space on Oracle Mount Points

Hi,
In my production environment, which is on ECC 5.0 on HPUX and Oracle DB, my mount point for the Oracle DB files has reached 90% plus......
What is the amount of free space that should be available on these mount points at any point of time. Will there be a performance issue in the above case.
Inputs on this will be appreciated.
Regards
Alfred D'Souza

Hello Alfred,
> What is the amount of free space that should be available on these mount points at any point of time. Will there be a performance issue in the above case.
Personally i try to keep 4 GB free space for each sapdata (for big systems), for smaller i only keep 1 GB.
Performance issues depends on your storage. If you have SAN storage with caches.. performance will be not affected, but if you have local disks it depends on the data striping and the i/o intensive actions.
But in general i say, the performance will be not affected by the free space.. it will only be affacted by the i/o actions and the distributed data over all sapdatas.
Regards
Stefan

BR1049W Not enough free space in /oracle/SID/sapdata

Hi Everybody,
I am trying to extend a tablespace through BR*tools. However I'm getting the Warning :
BR1049W Not enough free space in /oracle/SID/sapdata1 for total maximum size of all database files of tablespace...
As you could see below, I have still about 100 GB free on this logical volume.
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/sapdata_lvSID 899.88 99.97 89% 179 1% /oracle/SID/sapdata1
I wanted to add a datafile (size = 32GB), it didn't work.
Best regards
Latif

Can you please provide the SQL statement the brtools is issuing when adding the datafile. Probably ,for all the datafiles which are in /oracle/SID/sapdata1 , if the max size is added up , then the value is greater than the filesystem size. Please check in dba_data_files the maximum size upto which datafiles in sapdata1 can extend.
Use this to check:
select sum(MAXBYTES)/1024/1024/1024 from dba_data_files where FILE_NAME like '%sapdata1%';
if the value returned + the new datafile max size is > file system size you will get the above error.

Disk Management Claims there is "Free Space" on Disk 0. Possible to merge it into main drive?

Hello.
Thanks for having the time to read my post.
Recently, I was trying to Dualboot Windows 7 with another OS just to test something out(The Operating system was horrible.)
But anyway, when it was installing that OS, it took over 160 Gb memory out of my main drive and into a seprate drive for that os.
So when I went in Disk Management, I saw a hidden drive saying 160 Gb. I deleted it and now it's says under Disk 0 "159.83 Gb Free Space" in a green box.
I don't know how to merge that memory into my main C drive again.
Thanks.
son588

Hi Son588,
Why is it free space instead of unallocated space? I guess the drive you have deleted is a logical drive in extended partition. You can try to right-click the free space to deleted it again. If there is no partitions, locating between C drive and unallocated
space, you can merge the unallocated space in to C drive with the feature of "Extend Volume" built-in Disk Management. If not, there are two solutions to solve your problem:
Solution1: Backup partitions which locate between C drive and unallcated space, and then delete these partitions. Then merge unallcoated space into C drive with “Extend Volume”.
Solution2: Extend partition with free partition manager software.
Resources:
Free disk and partition backup software: http://www.aomeitech.com/aomei-data-backuper.html
Free partition manager software: http://www.disk-partition.com/free-partition-software.html
i hope it'll help you!

Space management oracle

Hi all,
Greetings of the day..
I have few doubts about the space management in ASSM tablespace.
1.Does ALTER TABLE SHRINK COMPACT needs ALTER TABLE ENABLE ROW MOVEMENT to be fired prior
2. I have table having fragmentation and materialized views on top of it updating with ROWID' s , how can i defragment the table without dropping the MVS
Thanks,
Uday

I'm not sure what you're showing here. Is this showing why you believe the table is fragmented? It shows that the table has some reclaimable space. That's not normally what people are concerned about when they talk about "fragmentation".
Note that if you use the \ tag (6 characters, all lower case) before and after cutting and pasting fixed format data (such as the output of SQL statements), you'll preserve the white space and make your posts much easier to read.
Justin

OCFS2 Free space issue

Hello,
I have an Oracle 11gR2 RAC on two Oracle Linux 5 nodes. For storage I use a couple of OCFS2 partitions.
I have deleted a database using dbca and also have deleted the remaining files from shared partitions. When I consulted the free space with df I was surprised to see that the partitions appear to have a lot of used space even that there are no files on them. I've seen a similar behavior on a gpfs partition on AIX. Even that the database was closed and deleted (and lsof doesn't return anything), and I don't see how some files could be still opened, I rebooted both nodes (complete shutdown and start after both were down).
Now I see this:
[root@node1 bin]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sdf1 4.0G 283M 3.7G 8% /d01
/dev/sde1 2.0G 283M 1.7G 15% /d02
/dev/sdj1 1.0G 91M 934M 9% /d03
[root@node1 bin]# cd /d01
[root@node1 d01]# ls -a
[root@node1 d01]#
How is it possible to have used space on those partitions even if they are empty?
How can I do some space management on OCFS2 partitions?
[root@node1 d01]# modinfo ocfs2
filename: /lib/modules/2.6.32-300.27.1.el5uek/kernel/fs/ocfs2/ocfs2.ko
license: GPL
author: Oracle
version: 1.6.3
description: OCFS2 1.6.3
srcversion: B8AF3035CE0F00B763D188F
depends: ocfs2_stackglue,ocfs2_nodemanager
vermagic: 2.6.32-300.27.1.el5uek SMP mod_unload modversions
Thanks.

fsck.ocfs2 -f /dev/iscsi/openfiler:disk01/part1
mount /dev/iscsi/openfiler:disk01/part1 /d01
Filesystem Size Used Avail Use% Mounted on
/dev/sdf1 4.0G *283M* 3.7G 8% /d01
It's the same.
Just to add, the partitions were formatted like this:
mkfs.ocfs2 -b 4K -C 32K -N 4 -L oracrsfiles /dev/iscsi/crs/part1
/etc/fstab:
/dev/iscsi/openfiler:disk01/part1 /d01 ocfs2 _netdev,datavolume,nointr 0 0

Reclaim free space in datafiles

Hello:
I have taken over management of one of our test servers with Oracle 9i on Windows2000 and have noticed that there are two files that are much larger than the space that is actually being used:
D:\ORACLE\ORADATA\ORCL\SYSTEM01.DBF - 17964M - (Used 1,542M)
D:\ORACLE\ORADATA\ORCL\DATA01.DBF - 12511M - (Used 243M)
How can I reclaim all of this unused space?

Remember it is always best to reclaim space by moving all the objects to another tablespace and reclaiming all space. This will free up space within the tables and indexes as well.
I use the following script to generate the commands for me:
resizea.sql:
drop table alan99;
set pages 50
create table alan99 as
select max(block_id+blocks) block_id,file_id from dba_extents
group by file_id;
column tablespace_name format a15
column pct format 999.99
set wrap off
set lines 120
set trunc off
column file_id format 999
spool resizea.lst
select b.bytes/1024/1024-a.bytes/1024/1024 CURRENT_meg,
a.file_id,a.tablespace_Name,'alter database datafile '''||b.file_name||''' resize '
||trunc(c.block_id*8192/1024/1024+1)||'m;'
from dba_free_space a,dba_data_files b, alan99 c
where a.file_id=b.file_id
and a.block_id=c.block_id and a.file_id=c.file_id
order by current_meg;
set termout off
drop table alan99;
set termout on
spool off
select 'Your output has been saved as resizea.lst' from dual;
A script that will tell you what is inside is:
column owner format a30
column object format a30
set lines 120
set wrap off
set trunc off
set pages 50
set feedback on
column file_id format 999
select     /*+ Rule */     'free space' owner     /*"owner" of free space*/
,          ' ' object          /*blank object name*/
,          file_id                    /*file id for the extent header*/
,          block_id               /*block id for the extent header*/
,          blocks                    /*length of the extent, in blocks*/
from          dba_free_space
where          file_id=&1
union
select     /*+ Rule */ substr(owner,1,20)||' '||substr(segment_type,1,9) /*owner name (first 20 chars)*/
,          substr(segment_name,1,32)||'.'||partition_name     /*segment name*/
,          file_id                    /*file id for the extent header*/
,          block_id               /*block id for the extent header*/
,          blocks                    /*length of the extent, in blocks*/
from           dba_extents
where          file_id=&1
order by     3,4
/

Oracle Free Space Management

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