Informations about 'alter tablespace ... coalesce'

Hi,
I'm quite new relatively to the DBA functions. I have an Oracle 8i database on a RedHat Linux server.
I've examined my tablespaces and I found that many of my tablespaces have the pctincrease=0. In this case the process SMON don't join the adjacent free extents so I have a lot of free extents but only few of them are coalesced.
I thought to coalesce them with the command 'alter tablespace nametablespace coalesce', but I don't know very much this command. I'd like to know more informations about it, above all if I can launch it when my users are working on the database or if it's better to stop the listener and to do a backup before to launch it (among the tablespace that I need to coalesce I have also the Temp tablespace).
In other words: is the alter tablespace coalesce an harmless command or I need to take some precutions ? And Where I can find more informations about this command ?
Thanks
Marco

You can find more information about the command by reading the manual.
Coalescing tablespaces is a relatively harmless command. You can run it while users are on the system. They might experience a momentary slowdown, but probably not. All the command does is delete and update entries in an Oracle internal table (FET$ if anyone cares). Coalesce will do nothing if there are no adjacent blocks of free space to coalesce.
You do not want to coalesce the freespace in your temp tablespace. Oracle manages this internally, and it is more efficient to have a lot of fragments for temp. It saves a lot of recursive sql when a new extent is needed for a sort.
In the other tablespaces, if the blocks of free space are relatively large, then coalescing will not really gain anything. If your fragments are small, and your segments are frequently allocating new extents (which in itself is a problem), then you may gain a little performance by manually coalescing the tablespace. However, Oracle will coalesce free space if required to get enough space to allocate a new extent.
If you want to see if coalescing will do anything, you can use:
SELECT tablespace_name,file_id,block_id,block_id + blocks next_free
FROM dba_free_space
ORDER BY 1,2,3Then check if next_free in the previous row is the same as block_id in the current row.
TTFN
John

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Question about ALTER TABLESPACE add/drop datafile

Good afternoon,
As an exercise, I created a tablespace STORETABS and added a datafile to it using the command:
SQL> alter tablespace storetabs add datafile 'e:/storetabs3.dbf' size 50M;This step succeeded. A new file was created in the root of e: as expected.
Following that command, I issued:
SQL> alter tablespace storetabs drop datafile 'e:/storetabs3.dbf';
Tablespace altered.The command succeeded. However, the file *'e:/storetabs3.dbf'* was not removed. After re-reading the documentation found at http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_3002.htm, I get the impression that removing the O/S file itself is something that always needs to be done manually.
The question: Am I correct that there is no option to cause the "alter tablespace <tablespace> drop datafile <datafilename>" to delete the O/S file ? In other words, must the O/S file always be manually deleted as a separate step ?
Thank you for your help,
John.

I believe in windows directory paths used backslash and not forward slash.
You can argue why oracle does not give error, either while creating or while dropping ;)
SQL> select * from v$version ;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL> select tablespace_name, file_name from dba_data_files ;
TABLESPACE_NAME
FILE_NAME
USERS
/u01/app/oracle/oradata/orcl/users01.dbf
UNDOTBS1
/u01/app/oracle/oradata/orcl/undotbs01.dbf
SYSAUX
/u01/app/oracle/oradata/orcl/sysaux01.dbf
SYSTEM
/u01/app/oracle/oradata/orcl/system01.dbf
EXAMPLE
/u01/app/oracle/oradata/orcl/example01.dbf
SCOTT_TBS
/home/oracle/scott_f1.dat
6 rows selected.
SQL> !ls -l scott_f1.dat
-rw-r----- 1 oracle oinstall 276832256 Sep 11 21:15 scott_f1.dat
SQL> alter tablespace scott_tbs add datafile '/home/oracle/scott_f2.dat' size 10M ;
Tablespace altered.
SQL> !ls -l scott_*.dat
-rw-r----- 1 oracle oinstall 276832256 Sep 11 21:15 scott_f1.dat
-rw-r----- 1 oracle oinstall 10493952 Sep 11 21:18 scott_f2.dat
SQL> alter tablespace scott_tbs drop datafile '/home/oracle/scott_f2.dat' ;
Tablespace altered.
SQL> !ls -l scott*.dat
-rw-r----- 1 oracle oinstall 276832256 Sep 11 21:15 scott_f1.dat

ALTER TABLESPACE ... COALESCE;

Could anybody tell me some situations where ALTER TABLESPACE ... COALESCE can help us (is necessary) ?
The some question for ALTER TABLE ... DEALLOCATE UNUSED;
Thanks, Paul

ALTER TABLESPACE ... COALESCE can help us (is necessary) ?
some question for ALTER TABLE ... DEALLOCATE UNUSEDIt would be helpful when your current storage requirement exceeds the maximum available continguous free extents chunk in the segment and the data file needs to be auto extended in order to incorporate your data (which otherwise would not have been required if above command made that required big chunk available).
Later applies to the blocks that are available for the table above/beyond HWM.
I hope this answers your questions.

Looking for information about AS3 sound classes in "audio" wrong places?

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I've read Adobe's LiveDocs on the Sound, SoundChannel, SoundMixer, SoundTransform classes. Indeed, they provided me enough guidance to create my own streaming MP3 player, with volume, pan, my own custom mono mix, http request, a preloading animation, and peak meters ...
Here's an example (in the last statement of the following code) where I understand the end effect, but I fail to comprehend what happens at the compiler level:
var currentSoundSource:Sound = new Sound();
currentSoundSource.load(new URLRequest("http://www.mySite.com/myRecording.mp3"));
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audioChannel_01 = currentSoundSource.play();
Unfortunately the class definitions in LiveDocs are quite terse, and they're seemingly incomplete with respect to:
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... and in certain cases it appears that Adobe's descriptions are not fully accurate.*
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One assumes that this surprising design must bear some advantages. If so, what are they? Where are the analog sound mixer analogies? What would be the disadvantage of a sound class with a stop method ... particularly when they have their own play method?
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Phrankie
* Here's an instance where the docs appear to be partially in error. (Is "and play" mistakenly included in the following?)
"The Sound class lets you lets you create a new Sound object [and] load and play an external MP3 file into that object."
... uh, mmmmmm ... we play an MP3 into a sound class object?
Wouldn't it be more accurate to say the following:
A soundChannel can receive the audio data from a sound class object. We can play a sound object into an SoundChannel and manipulate it by altering the SoundChannel's soundTransform property, and we can stop it with the SoundChannel's stop method.

check everything you can find written by tinic uro. this will get you started: http://www.kaourantin.net/

Alter tablespace sa online;

Dear Everyone,
SQL> alter tablespace sa online;
alter tablespace sa online
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: '/u01/app/oracle/product/11.2.0/db_1/dbs/tbs_data.dat'
Can anyone tell me what is the problem here
SQL> recover datafile '/u01/app/oracle/product/11.2.0/db_1/dbs/tbs_data.dat';
ORA-00279: change 1859444 generated at 06/17/2013 02:57:17 needed for thread 1
ORA-00289: suggestion :
/flash_recovery/flash_recovery_area/SA/archivelog/2013_07_01/o1_mf_1_35_%u_.arc
ORA-00280: change 1859444 for thread 1 is in sequence #35
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
AUTO
ORA-00308: cannot open archived log
'/flash_recovery/flash_recovery_area/SA/archivelog/2013_07_01/o1_mf_1_35_%u_.arc
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log
'/flash_recovery/flash_recovery_area/SA/archivelog/2013_07_01/o1_mf_1_35_%u_.arc'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Can Anyone please help me on this.
Thanks
Gajanan

Gajananh999 wrote:
Dear Everyone,
SQL> alter tablespace sa online;
alter tablespace sa online
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: '/u01/app/oracle/product/11.2.0/db_1/dbs/tbs_data.dat'
Can anyone tell me what is the problem here
SQL> recover datafile '/u01/app/oracle/product/11.2.0/db_1/dbs/tbs_data.dat';
ORA-00279: change 1859444 generated at 06/17/2013 02:57:17 needed for thread 1
ORA-00289: suggestion :
/flash_recovery/flash_recovery_area/SA/archivelog/2013_07_01/o1_mf_1_35_%u_.arc
ORA-00280: change 1859444 for thread 1 is in sequence #35
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
AUTO
ORA-00308: cannot open archived log
'/flash_recovery/flash_recovery_area/SA/archivelog/2013_07_01/o1_mf_1_35_%u_.arc
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log
'/flash_recovery/flash_recovery_area/SA/archivelog/2013_07_01/o1_mf_1_35_%u_.arc'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Can Anyone please help me on this.
Thanks
Gajanan
Why was tablespace SA offline in the first place?
What did you do with /flash_recovery/flash_recovery_area/SA/archivelog/2013_07_01/o1_mf_1_35_%u_.arc that the recovery could not find it?
What version (to 4 decimals) and edition (Enterprise, Standard, Standard One) is your database?

Alter tablespace RW on standby database

I work with Oracle8i for Solaris.
I've created a stanby database which is opened in read only.
Now, I need to use a temporary tablespace, so
I've tried :
"alter tablespace temp nologging read write;"
But, oracle answer me an ORA-16000 error (database open for read-only access).
So :
1) Is it possible to use a temporary tablespace in standby mode ?
2) How.
Thanks,
Philippe
null

Hello,
Since the table sizes is about 100GB , it takes time to move and rebuild the indexes and the end user application doesnot work if any of the index is unusable or not present.I think it will generate a lot of Archived logs, so it will be very heavy to manage and apply to your Standby.
If it's possible, it will be faster to put your Primary database in NOARCHIVELOG mode then, you make the Move and Rebuild.
Afterwards, you put again the Primary in ARCHIVELOG mode and take a good BACKUP of it.
Later, when nobody work on Standby, you recreate it.
Hope this help.
Best regards,
Jean-Valentin

Alter tablespace

hi all, what do the following means ?
1) ALTER TABLESPACE MYTABSPACE LOGGING
2) ALTER TABLESPACE MYTABSPACE NOLOGGING
regards,
Kong

From the documentation:
logging_clause
You should read that page. An excerpt:
Only the following operations support the NOLOGGING mode:
DML:
Direct-path INSERT (serial or parallel)
Direct Loader (SQL*Loader)
DDL:
CREATE TABLE ... AS SELECT
CREATE TABLE ... LOB_storage_clause ... LOB_parameters ... NOCACHE | CACHE READS
ALTER TABLE ... LOB_storage_clause ... LOB_parameters ... NOCACHE | CACHE READS (for specify logging of newly created LOB columns)
ALTER TABLE ... modify_LOB_storage_clause ... modify_LOB_parameters ... NOCACHE | CACHE READS (to change logging of existing LOB columns)
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ALTER TABLE ... [all partition operations that involve data movement]
ALTER TABLE ... ADD PARTITION (hash partition only)
ALTER TABLE ... MERGE PARTITIONS
ALTER TABLE ... SPLIT PARTITION
ALTER TABLE ... MOVE PARTITION
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ALTER TABLE ... MODIFY PARTITION ... COALESCE SUBPARTITION
ALTER TABLE ... MODIFY PARTITION ... REBUILD UNUSABLE INDEXES
CREATE INDEX
ALTER INDEX ... REBUILD
ALTER INDEX ... REBUILD PARTITION
ALTER INDEX ... SPLIT PARTITION

Information about the default setup for the demo user

Hi,
Can anyone guide me the properties which we have to set for the below
# Information about the default setup for the demo user.
db.adminUser=system
db.demoUser=FOD
db.demoUser.password=fusion
db.demoUser.tablespace=USERS
db.demoUser.tempTablespace=TEMP
And what exactly they represent
Regards,
Krishna

Krishna,
It's pretty obvious...
db.adminUser = the username of a dba user in your database
db.demoUser = the username of the demo user that will get created
db.demoUser.password = the password that will be used for the demo user
db.demoUser.tablespace = the default tablespace for the demo user
db.demoUser.tempTablespace = the default temporary tablespace for the demo user
You don't have to change any of them.
John

Enqueue while trying to alter tablespace

I try to run the "alter tablespace .... read only " command ,
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instead when I run "select * From v$session_event where sid=XX"
I get an event named enqueue with large number in "total_waits" column and the same number in "total_timeout" column .
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who else can lock the same object ?
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how can I monitor it and find out what causes the lock ?
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Thanks .

please someone correct me if I'm wrong ,
but I've just entered the metalink site , and saw that it is a reported bug affecting versions 9.2.0.5 and 10.1.0.3 .
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I'm running OS X 10.4.11 on my PowerMac, and cannot retrieve email. Does this have to do with iCloud? I also cannot upgrade my operating system as my computer won't accept it. Any information about this for me? Thank you!

Hi Steve,
If this is dot mac or Mobile me you can still use IMAP eMail in the iCloud.
Do not delete the old account yet. sign up for an iCloud account if you haven't.
MAKE A NEW ACCOUNT - DO NOT TRY TO ALTER YOUR EXISTING ACCOUNT.
I understand .mac mail will still come through. Do not delete the old account yet.
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Also, you must upgrade your password to meet the new criteria: 8 characters, including upper and lower case and numbers. If you have an older password that does not meet these criteria, when you try to setup mail on your mac, using all of the IMAP criteria listed above, it will still give a server error message. Go to   http://appleid.apple.com         then follow directions to change your password, then go back to setting up your mail using the IMAP instructions above.
Thanks to dpepper...
https://discussions.apple.com/thread/3867171?tstart=0

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Thank's in advance.
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I am using the Order Analysis Toolkit and want to get more information about the compensation for "Reference Signal Processing", which is scarce in the manuals, the website and the examples installed with the toolkit.

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In particular, I am analyzing the example "Even Angle Reference Signal Processing (Digital Tacho, DAQmx).vi", whose documentation I am reproducing in the following:
DESCRIPTIONS:
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My question is: How is the synchronization produced at the time of the compensation ? How is it possible to eliminate the errors in a synchronized fashion with respect to the surface of the shaft bearing in mind that I am acquired data at a low rotation speed in order to get the "even angle reference" and then I use it to remove the errors in the vibration signal acquired at normal operation. In this application both operations are made in different acquisitions, therefore the reference of the correction signal is lost. Is it simply compensated without synchronizing ?
Our application is based on FPGA and we need to clarity those aspects before implementing the procedure.
Solved!
Go to Solution.

Hi CracKatoA.
Take a look at the link bellow:
http://forums.ni.com/ni/board/message?board.id=170&message.id=255126&requireLogin=False
Regards,
Filipe Silva

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We recently upgrade our SQL Server 2012 SP1 (64bit) dev edition to standard edition, after we purchased the required licence and it was deployed in production.
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Hi,
Which user account you used for SQL Server service, domain account or local account?
If it is domain account, are you able to log in to a machine with it?
Make sure that the password of account is not expired.
Also, grant the user Allowed to Authenticate permission and see how it helps.
Refer to the below article:
http://geeks.ms/blogs/ozonicco/archive/2013/01/14/208266.aspx
Thanks.
Tracy Cai
TechNet Community Support

Informations about 'alter tablespace ... coalesce'

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