Shrinking a database file

Hello everybody,
I want to shrink a database file (temporary file from temporary tablespace). How can I do that either with SQL Plus either with Oracle DBA Studio. I have Oracle 8i.
Thanks.

I would say "Yes" for shrinking unless space is your major constraint.
Definitely you can shrink the files but emptying a file requires lot of page movement, Its going to halt your database for a while. This is going to cause the issue.
If you check the extent usage of each file using
dbcc showfilestats
and then use the corresponding file where it requires shrinking
DBCC shrinkfile(fileid,target_size)
This is going to online operation and you can stop the process whenever you want.
--Prashanth

Similar Messages

Shrinking database file

Hi experts,
According to the reference guide(4.9 Diskspace Requirements), BDB does not return the freed space to underlying file system by deleting entries. And it also says that we need to create a new database and copy the records from the old one into it.
Followings are my questions...
Q1. In case of BTree, there is 'compact' api. Which one is better in performance of other view points between using 'compact' and copying into new DB?
Q2. Is it the only way for Hash?
Q3. The guide also saying that pages that key/data pairs are deleted from, can be reused where possible. Is there any criteria or rule for reusing it or not? Can we control it?
Q4. What about with in-memory configuration? Are these same?
Thank you.

Hello,
First SQL server 2000 is totally outdated and is no longer supported in any kind by Microsoft.
>>However, in the Recovery option if I switch it to simple and then shrink the database it will shrink
Shrinking of database is most evil operation you can do in SQL Server it causes massive fragmentation so please don't do it.You can go for data file shrink IF THERE IS GRAVE requirement to shrink it.SQL server data file might not
always respond to shrink command as release space.From what you posted seems like you are trying to shrink log file .You cannot shrink log file if last Virtual Log file( VLF) is still required by some transaction.To make sure it is marked as reusable you need
to take log backups at frequent interval ONLY LOG backup can truncate the logs and make VLF reusable and then you can shrink( A long running transaction can still hold VLF hostage and wont allow it to be marked as reusable).
When yo change recovery model to simple you force checkpoint which causes VLF to truncate and thus you can free space.
Further reading
http://technet.microsoft.com/en-us/magazine/2009.02.logging.aspx
http://technet.microsoft.com/en-us/library/ms178037%28v=sql.90%29.aspx
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers

Shrinking a database after a cut-down

Hi all,
I have the scenerio below, any hints tips most welcome ...
- we are using oracle 9.2.0.1
- get a copy of a production database 80gb and put into another db
- run a cutdown script that culls about 70% of the data, for purposes of use as test databasese
What steps do we need to take to shrink this database now. I recalled an export and a import (with some option), then an export and then another reimport.
We need to shrink the tables that have had data removed as well as shrink the tablespaces (data files?). The resulting database will have a very small growth factor.
Is there a relatively easy way to achieve this?
Thanks for any advice.

When data is removed randomly from the database there is going to be freagmentation. The best way to avoid this is
1) Create one temporary tablespace tempdata
2) For each tablespace
move all objects to the tempdata tablespace
calculate the total size of the objects in tempdata
drop and recreate the tablespace with the required size
move the objects from tempdata
3) Repeat step 2 fro all tablespaces

SAP Program to Shrink the log file

Hi,
I have NW2004s runing or ORacle 10g Database.
Please let me knwo the code/SAP Program to shrink the log file created in the Database

i hope these threads may help you..
http://www.databasejournal.com/scripts/article.php/1446961
http://www.databasejournal.com/scripts/article.php/1492301

Why shrinking the data file is bad?

Hi All,
Why shrinking the data file is bad?
If it is bad, Then why SQL server has this option?

There are several reasons why shrinking is bad. One of the reasons were recorded already by Louis Jordan around 1950 where he sang What's the Use of Getting Sober, when You Are Gonna Get Drunk Again?" That is, why shrink something that will grow
again? Growing a database file takes some resources, since it has to be zero-initialised. For a data file this can be avoided by granting the service account for SQL Server the permission "Perform Volume Operations" (if I recall the name correctly).
For a log file it is unevitable. While SQL Server grows the file, this causes a standstill for the process that triggered the file to grow, and can easily cause a bigger outage.
Another reason that shirnk is bad is that it adds a lot of fragmentation to the database. In difference to the above, there is no reason it has to be that way. It's simply not an optimal implementation.
Shrinking can be really poor when you have big LOB columns.
So why does shrink exist? Because sometimes, shrinking a data file or a log file is a perfectly legit operation. Say that you have a transaction database, and you decide to move transactions that are more than 12 months old to an archive database,
and you also implement a process to move data to the archive database on quarterly basis. Before you implemented the archive database, the transaction database was 1.5 TB, but after you moved ten years worth of data, you now have a 250 GB database. In this
case, it would be perfectly reasonable to shrink the data file to, say, 300 GB to make it more managable.
Or say that you make a change to your reindex job so that it runs with bulk_logged recovery rather than full. This may permit you to reduce the size of the log file with 50% (a number taken out of thin air).
There are lot of other situations, but the key is: you have reason to believe that the data file will stay within the size you shrink it to. Some people are obesseed with space and shrink whenever they get the occasion, but that is a bad idea.
Erland Sommarskog, SQL Server MVP, [email protected]

Autogrowth, shrink and database performance

I have already asked some questions about Autogrowth and shrink. But I have some doubts related to it.
1)I have a database which grows about 300 MB every month. So is it best to set Autogrowth of 300 MB to it? Now 10 MB is set.
2)I have so many small databases which really have data of about 50 MB. But it's physical size is about 900 MB.(So 850 is free space). I have not shrinked this database. As if i shrink it then again when data gets added autogrowth occurs. But adding data to
this database is rare. So I think it will not gro more than 200 mb for next one year. So should i shrink the database? If I keep it as it is Should that cause any performance problem? Or having more free space(more than 90%) in database will cause any problem.
I think most of the people think having large physical size will cause performance problem. So is it true or not?
3) SQL Server 2008 R2 Express Database Size Limit is 10 GB. So is it physical size of both mdf and ldf file together? because I need to consider this if i should shrink database at any point.

1) If this is a database where you expect performance, the current auto growth setting gives the following disadvantages:
- It will affect performance. Database files grow too often and it's unnecessary work for SQL Server during normal operations. It takes time to grow database files and especially if you have not turned Instant File Initialization on, which is highly recommended
by the way. I would prefer to grow databases off peak hours and once a year.
- The database file(s) gets fragmented. If SQL keeps allocating small 10 MB chunks the file will eventually have hundreds of fragments instead of just a few. Fragmentation reduces IO performance.
I would set the database file sizes to what you expect it to grow to within a year, plus 10 % and set auto growth to perhaps 300 MB that will kick in if your calculations were off. Next year you manually grow the database again according to your new 1-year
prediction. That way you will hopefully get less fragmentation and very few operational disturbances due to auto growth in peak hours.
2)
Keeping the database as is will not cause anything else than that the database is consuming unnecessary disk space, a lot of free space does not affect performance negatively. SQL Server does not do more IO just because you have large file(s). Having to little
free space in a db can cause internal fragmentation and will affect performance negatively. However, you should not fill up the spindles to more than 80% (some say 85%) since your storage will be noticeable slower.
You can shrink the database but that usually causes performance problems due to the shrink operation creates massive internal fragmentation in the database. But you can fix that by rebuilding all indexes and tables, starting with the clustered ones first.
So don't shrink the database so much that it must start with growing itself to accommodate for all index rebuilds.
Hope this helps!
Peter

While generating a crystal report can we edit database files in field explorer ?

Hi,
while generating a crystal report can we edit database files in field explorer (at middle can we edit database fields)
Regards,
Mahendra

Wrong forum to post the question, try to post the question in crystal reports community.
Its not possible to edit the database fields while creating the reports, its only used to call the rows of values in it. Can you explain me in detail what are you actually looking for .
--SumanT

SQL and database file

Hello.(sorry for my english)
I have a legacy system , ported to opencobol that uses Berkeley DB. I can successfully open the database files using java both in windows and linux. However i want to create a web front end for the application.
Data is stored using strange cobol structures (most numbers are stored as text or 4 bits per digit) and other fancy stuff.. so custom parsers should be written. (dont rember BDB classes name for that)
I have been reading the documentation of Berkeley DB 12 hours totaly today but couldnt find answers to some questions...
Is it possible to attach the database to dbsql.exe (sqlite) server ?? I tried to do "attach "..pathtofile" as NULL ,but i get multiple databases specified and not supported and other stupid messages....
I think that what i tried propably doesnt make sense as collumns arent specified and nothing is in order this thing to work ..It is a simple Key value database.
So i am a little stucked here.
The only solution i can think is to synchronize with a relational Database. But i dont have triggers or nothing that helps....
Note that i want one way synchronization. The "other way" will have very limited tasks.
It seems to me that checking every x minutes if something changed using a cursor is a demanding task. So i am wondering.. Is there a way to track changes???
Thank you :)
Edited by: 843912 on 12 Μαρ 2011 7:13 μμ

Hello,
I am not sure I completely understand your question. If you are asking about importing
and exporting data from a Berkeley DB database into an Oracle DB Table in Berkeley DB
releases prior to 5.*, then this can be done with the Oracle OCI interface. If I am
misunderstanding the question, please let me know.
Thanks,
Sandra

Finding whole mapping from database file - filesystems - logical volume manager - logical partitions

Hello,
Trying to make reverse engeneering of database files and their physical carriers on logical partitions ( fdisk ).
And not able to make whole path from filesystem down to partitions with intermediate logical volumes.
1. select from dba_data_files ...
2. df -k
to get the listing of filesystems
3. vgdisplay
4. lvdisplay
5. cat /proc/partitions
6. fdisk /dev/sda -l
   fdisk /dev/sdb -l
Problem I have is that not able to determine which partitions are consisten in logical volumes. And then which logical volumens are consisted in filesystem.
Thank you for hint or direction.

Hello Wadhah,
Before start the discussion let me explain I am newcommer to Oracle Linux. My genetic with dba experience of Oracle is from IBM UNIX ( AIX 6.1 ) and Oracle 11gr2.
First task is to get the complete picture of one database on Oracle Linux for future maintenance tasks and make database more flexible and
preparing for more intense work:
-adding datafiles,
-optimize/replace archive redolog files on separated filesystem from ORACLE_BASE
- separating auditing log files from $ORACLE_BASE to own filesystem
- separating diag directory on separated file system ( logging, tracing )
- adding/enlarging TEMP ts
- adding/enlarging undo
- enlarging redo for higher transaction rate ( to reduce number of switched per time perceived in alert_SID.log )
- adding online redo and control files mirrors
So in this context try to inspect content of the disk space from the highest logical level in V$, DBA views down to fdisk partitions.
The idea was to go in these steps:
1. select paths of present online redo groups, datafiles, controlfiles, temp, undo
   from V$, dba views
2. For the paths got from the step 1
   locate filesystems and for those filesystems inspect which are on logical volumens and which are directly on partitions.
3. For all used logical volumes locate the logical partitions and their disks /dev/sda, /dev/sdb, ...

How to query a database file on my hard drive?

Hi,
I have a filer called "server.dbs" on my hard drive. It is a database file. I use a simple program that allows you to view databases, and it loads up and I can traverse the database and see all the entries as any standard database.
So I figured that Java's ability to handle SQL would allow me to make a standard SQL statement querying the database, and be able to get the results. The software stores servers in SID fields, and the value is the port the server runs on. I want to make a simple query to select a server by SID, and print the port in which that server is running on.
So is there any way to, via my java application, load a database from a file (rather than a url) which has no authentication required, and simply make my queries directly to that file? If so, how?
Thanks!
-Josh

Normal database access is via JDBC.
http://java.sun.com/docs/books/tutorial/jdbc/index.html
To use that JDBC driver is needed to access the database. Databases in wide usage all have one. It isn't clear from your posting that you have a common database though.

ORA-01122: database file 8 failed verification check

trc file: "dev_w0", trc level: 1, release: "700"
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M DpShMCreate: allocated comm_adm at 08B2D590
M DpShMCreate: allocated file_adm at 08BAE450
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M DpShMCreate: allocated vmc_adm at 08BE1180
M DpShMCreate: allocated ca_info at 08BE5AA0
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M DpSesCreateTable: attached session table at 06440040 (len=138424)
X EmInit: MmSetImplementation( 2 ).
X MM global diagnostic options set: 0
X
X Tue Apr 29 17:57:52 2014
X <ES> client 0 initializing ....
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M Tue Apr 29 17:57:53 2014
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M Tue Apr 29 17:57:54 2014
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C Starting user session (con_hdl=0,svchp=06C39078,srvhp=06C4A944,usrhp=06C979A8)
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C Tue Apr 29 17:57:55 2014
C Now '/@DEV' is connected (con_hdl 0, nls_hdl 0).
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J getEvtConnHdl is set to disp+work.ThJGetEvtConnHdl(thxxjava.c:1099)
J selNextHdl is set to disp+work.ThVmcSelNextHdl(thxxvmio.c:335)
J rollOut is set to disp+work.ThJRollOut(thxxjava.c:5737)
J sleepFunc is set to disp+work.ThJSleep(thxxjava.c:6901)
J selTimeout is set to disp+work.ThJSelTimeout(thxxjava.c:7292)
J proxyWakeup is set to disp+work.ThJHandleProxyWakeup(thxxjava.c:7610)
J extGetProxyActivatedHook is set to disp+work.ThJGetSapProxyActivated(thxxjava.c:7423)
J getVmcFlavour is set to disp+work.ThJGetVmcFlavour(thxxjava.c:7675)
J getVmType is set to disp+work.ThJGetVmType(thxxjava.c:7687)
J getVmMaxNo is set to disp+work.ThJGetVmMaxNo(thxxvmemu.c:3049)
J getVmId is set to disp+work.ThJGetActVmc(thxxjava.c:9681)
J isValidVmId is set to disp+work.ThJisValidVmId(thxxvmemu.c:3075)
J getVmUuid is set to disp+work.ThJGetVmUuid(thxxvmemu.c:3059)
J createUniqueId is set to disp+work.ThJCreateUniqueId(thxxvmemu.c:3084)
J statisticActive is set to disp+work.ThJStatisticsActive(thxxjava.c:7830)
J openStatInterval is set to disp+work.ThJOpenStatInterval(thxxjava.c:7852)
J closeStatInterval is set to disp+work.ThJCloseStatInterval(thxxjava.c:7868)
J intervalStatActive is set to disp+work.ThJIntervalStatActive(thxxjava.c:7885)
J extTrace is set to disp+work.ThJTrace(thxxvmemu.c:3129)
J extGetBuiltinLibs is set to disp+work.ThJGetBuiltinLibs(thxxjava.c:6250)
J extFindNative is set to disp+work.ThJFindNative(thxxvmemu.c:3150)
J extPreloadNativeOpen is set to disp+work.ThJPreloadNativeOpen(thxxjava.c:6264)
J extPreloadNativeSym is set to disp+work.ThJPreloadNativeSym(thxxjava.c:6276)
J extGetDebugFlags is set to disp+work.ThVmcGetBitmasks(thxxvmc.c:2500)
J extStartExternalTimer is set to disp+work.ThJStartExternalTimer(thxxjava.c:6288)
J extStopExternalTimer is set to disp+work.ThJStopExternalTimer(thxxjava.c:6309)
J extCheckForCleanup is set to <null>
J extJvmxInit2 is set to <null>
J extJvmxCleanup is set to <null>
M ThVmcInitWaitForVm: th_maxWaitForVmTime=30
I
I Tue Apr 29 17:58:05 2014
I MtxInit: 0 0 0
M SHM_PRES_BUF (addr: 0BD30040, size: 4400000)
M SHM_ROLL_AREA (addr: 59250040, size: 61440000)
M SHM_PAGING_AREA (addr: 0C7D0040, size: 32768000)
M SHM_ROLL_ADM (addr: 0C170040, size: 615040)
M SHM_PAGING_ADM (addr: 0C210040, size: 525344)
M ThCreateNoBuffer allocated 544152 bytes for 1000 entries at 0C2A0040
M ThCreateNoBuffer index size: 3000 elems
M ThCreateVBAdm allocated 12160 bytes (50 server) at 0C330040
X EmInit: MmSetImplementation( 2 ).
X MM global diagnostic options set: 0
X <ES> client 0 initializing ....
X Using implementation flat
X ES initialized.
C
C Tue Apr 29 17:58:06 2014
C *** ERROR => ORA-376 occurred when executing SQL statement (parse error offset=0)
[dbsloci.c    12548]
C sc_p=06198094,no=1,idc_p=06B97F38,con=0,act=1,slen=66,smax=256,#vars=0,stmt=06C5E6B8,table=DDNTT
C SELECT COUNT(*) FROM DDNTT WHERE TABFORM <> 'J' AND TABFORM <> 'V';
C sc_p=06198094,no=1,idc_p=06B97F38,con=0,act=1,slen=66,smax=256,#vars=0,stmt=06C5E6B8,table=DDNTT
C prep=0,lit=0,nsql=0,lobret=0,#exec=1,dbcnt=0,upsh_p=00000000,ocistmth_p=06C51FC0
C IN : cols=0,rmax=0,xcnt=0,rpc=0,rowi=0,rtot=0,upto=-1,rsize=0,vmax=0,bound=0,iobuf_p=00000000,vda_p=00000000
C       lobs=0,lmax=0,lpcnt=0,larr=00000000,lcurr_p=00000000,rret=0
C OUT: cols=1,rmax=1,xcnt=1,rpc=0,rowi=0,rtot=0,upto=-1,rsize=4,vmax=32,bound=1,iobuf_p=05637578,vda_p=06C5DB68
C       lobs=0,lmax=0,lpcnt=0,larr=00000000,lcurr_p=00000000,rret=0
C SELECT COUNT(*) FROM DDNTT WHERE TABFORM <> 'J' AND TABFORM <> 'V';
B ***LOG BYL=> DBQ action required because of database error            [dbsh#2 @ 1100] [dbsh    1100 ]
B SQL code: 376, SQL text: ORA-00376: file 8 cannot be read at this time
B ORA-01110: data file 8: 'D:\ORACLE\DEV\SAPDATA1\SR3_5\SR3.DATA5'
B ***LOG BY4=> sql error 376    performing SEL on table DDNTT      [dbstat#4 @ 693] [dbstat 0693 ]
B ***LOG BY0=> ORA-00376: file 8 cannot be read at this time
ORA-01110: data file 8: 'D:\ORACLE\DEV\SAPDATA1\SR3_5\SR3.DATA5' [dbstat#4 @ 693] [dbstat 0693 ]
B init: Got no entries from DDNTT !
B init failed
B db_stinit failed
M *** ERROR => ThCallHooks: event handler db_init for event CREATE_SHM failed [thxxtool3.c 260]
M *** ERROR => ThIPCInit: hook failed [thxxhead.c   2047]
M ***LOG R19=> ThInit, ThIPCInit ( TSKH-IPC-000001) [thxxhead.c   1494]
M in_ThErrHandle: 1
M *** ERROR => ThInit: ThIPCInit (step 1, th_errno 17, action 3, level 1) [thxxhead.c   10156]
M
M Info for wp 0
M
M    stat = 4
M    reqtype = 1
M    act_reqtype = -1
M    rq_info = 0
M    tid = -1
M    mode = 255
M    len = -1
M    rq_id = 65535
M    rq_source = 255
M    last_tid = 0
M    last_mode = 0
M    semaphore = 0
M    act_cs_count = 0
M    control_flag = 0
M    int_checked_resource(RFC) = 0
M    ext_checked_resource(RFC) = 0
M    int_checked_resource(HTTP) = 0
M    ext_checked_resource(HTTP) = 0
M    report = >                                        <
M    action = 0
M    tab_name = >                              <
M    vm = V-1
M
M *****************************************************************************
M *
M * LOCATION    SAP-Server sapecc6_DEV_00 on host sapecc6 (wp 0)
M * ERROR       ThInit: ThIPCInit
M *
M * TIME        Tue Apr 29 17:58:06 2014
M * RELEASE     700
M * COMPONENT   Taskhandler
M * VERSION     1
M * RC          17
M * MODULE      thxxhead.c
M * LINE        10354
M * COUNTER     1
M *
M *****************************************************************************
M
M PfStatDisconnect: disconnect statistics
M Entering TH_CALLHOOKS
M ThCallHooks: call hook >ThrSaveSPAFields< for event BEFORE_DUMP
M *** ERROR => ThrSaveSPAFields: no valid thr_wpadm [thxxrun1.c   720]
M *** ERROR => ThCallHooks: event handler ThrSaveSPAFields for event BEFORE_DUMP failed [thxxtool3.c 260]
M Entering ThSetStatError
M ThIErrHandle: do not call ThrCoreInfo (no_core_info=0, in_dynp_env=0)
M Entering ThReadDetachMode
M call ThrShutDown (1)...
M ***LOG Q02=> wp_halt, WPStop (Workproc 0 2816) [dpnttool.c   327]
sql>select status from v$datafile;
status
One of my datafile status is 'RECOVER'
SQL>recover datafile 8;
ora_00283 recover session cancelled due to errors
ora_01110:datafile 8:'d:\oracle\sid\sapdata1\sr3_5\sr3.data5'
ora_01122:database file 8 failed cerification check
ora_01110:datafile 8:d:\oracle\sid\sapdata1\sr3_5\sr3.data5'
ora_01251:unknown file header version read for file number 8
Please give me the suggestion..
Best regards
nani

Hi K Nani,
From your error message
ora_01122:database file 8 failed cerification check
ora_01110:datafile 8:d:\oracle\sid\sapdata1\sr3_5\sr3.data5'
ora_01251:unknown file header version read for file number 8
Looks like Data file is corrupted.
You may refer SAP note 696141 - Composite SAP Note: ORA-01122
10. ORA-01251: Unknown File Header Version read for file number <file_id>
Reason: The file header cannot be correctly read.
Solution: If you use Oracle 9.2 on WINDOWS and if you already installed the database with Oracle 7.2 or lower, see Note 636466.
           Otherwise: Restore/recovery
Only solution here is restore the database from backup.
Alternate solution If it is a non-production system.
If the file is corrupted, then take the datafile offline and open the database.
Hope this helps
Regards,
Deepak Kori

[SOLVED] database file for multilib does not exist

Hey guys I ran into a problem today when I tried to install the proper packages I needed to use my wifi card. However when I tried to install it it gives me the error "database file for multilib does not exist" I can t seem to find out why I even tried chrooting into it and installing it that way with no luck. The package I tried to install was "pacman -S wireless_tools netcfg" thanks for the help guys you've been great.
Last edited by bdawg (2012-09-18 22:57:17)

bdawg wrote:
Ok so the whole output is as follows:
Warning: database file for 'multilib' does not exist
Error: failed to prepare transaction (could not find database)
And my Pacman.conf is blank
pacman.conf and Pacman.conf (with capital 'P') are two different files. Double-check this.
Are you running a 64-bit system?
Your /etc/pacman.conf should look like this: https://projects.archlinux.org/pacman.g … an.conf.in but with some repositories configured: https://wiki.archlinux.org/index.php/Pa … positories
Last edited by karol (2012-09-18 22:13:59)

How to use database file within jar archive

Hi. I'm quite new in Java programming, and I'm wondering if what I did makes sense or not.
In my applet I'm using a MS Access Database file, which is contained in the same Jar Archive like the Applet class file. I tried and tried to use this Database file directly but it wouldn't work. Than I read in some other forum that it is not possible to use the database file directly within the archive. First question: Is that true?
Than I desided to extract the DB file in the init() method of my applet to the default temporary foulder. When the program is closed I use the destroy() method to delete it again. Everything works well now. But is this the typical way this is done?
Thanks for help!

Hi,
here is the code which extracts the database file out of the jar archive (the same archive in which the class file is):
//get the user temporary folder
File TempFolder = new File(System.getProperty("java.io.tmpdir"));
//create (empty) db file
efile = new File(TempFolder, "steelSections.mdb");
// if database file is not yet extracted
if (!efile.exists()) {
//get an input stream for the database file
InputStream in = new BufferedInputStream(this.getClass().getClassLoader().getResourceAsStream(
"FaST/db/steelSections.mdb"));
//create an output stream for the db file on the file system
OutputStream out = new BufferedOutputStream(new FileOutputStream(efile));
//-Buffer to copy the data
byte[] buffer = new byte[2048]; //buffer to copy the binary
for (;;) {
int nBytes = in.read(buffer); //read data
if (nBytes <= 0)
break; //no more data to read
out.write(buffer, 0, nBytes); //write data
out.flush(); //close out and in streams
out.close();
in.close();
If you have the db file in an other jar archive file you need a referenze to the entry in the other jar archive. I'm not sure how to get this, but I'm sure you fill find a solution by searching in this forum...
Good luck!

Database files into a single disk or multiple disk ?

Hi All,
I want to install oracle database 11gR2 in to database server. This database server has three internal disk so I plan to put DBF,redo and ctl file in to different disk..
but this is the optimal configuration by putting all the Database files (DBF,redo and ctl) into a differnt differnt disk or put all the files into a single disk with differnt partition? I want to minimize the disk I/O.
Thanks in advance.

Hi;
It depends what you expect from your system. You can put into a differnt differnt disk or put all the files into a single disk with differnt partition. If you put all in one partition its more managable, but It also bad for HA.
You need to check your priorty and you need to decide what you have to do
Regard
Helios

HOW DO YOU CONVET AN ORACLE DATABASE FILE TO A TXT FILE?

Is there a way in a program unit of a form to convert an ORACLE database file into TXT format? When the file gets created, I want to use the text file in a distribution list for sending email. My code in the program unit is:
Insert into THE_IMO_EMAIL
Select distinct imo_email from DS_POC
where imo_email is not null;
commit;
Table THE_IMO_EMAIL is a temporary table. The temporary table gets deleted everytime before records get inserted into it. There is only 1 item in the temporary table.
IMO_EMAIL VARCHAR2(55)
After the COMMIT I want to copy the contents out of the
THE_IMO_EMAIL into a TXT File.
How do I do this? What parameters do I need to use? Should I do this in another program unit?

can you be more clear on this
"DATABASE FILE" what is this? an RDBMS file and you need this in ASCII format. I am lost.

Shrinking a database file

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