Database Keeps Running Even After Deletion / Corruption Of Control Files
Jan 21, 2011
I was carrying out an experiment in order to crash the database and recover it.
The database was running, I moved the control file to another location and to my surprise the database was still running. I tried issuing checkpoint and transaction but it didn't affect database operations. I tried doing log switch. It completed successfully. According to my understanding and Oracle Certification books database was supposed to crash. But it didn't.
I tried this not only on RHEL, Windows XP but also in Solaris 5.10. The database version is Oracle 10.2.0.4 Standard Edition.
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Jun 4, 2012
I'm have in Oracle version Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production:
while enter in a command
$emctl status dbconsole
output comes:
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright © 1996, 2005 Oracle Corporation. All rights reserved.
http://localhost.localdomain:1158/em/conso...boutApplication
Oracle Enterprise Manager 10g is running.
----------------------------------------------------------------------------------
$emctl stop dbconsole
output comes:
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright © 1996, 2005 Oracle Corporation. All rights reserved.
http://localhost.localdomain:1158/em/conso...boutApplication
Stopping Oracle Enterprise Manager 10g Database Control ...
-----------------------------------------------------------------------------------
$emctl start dbconsole
output comes:
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright © 1996, 2005 Oracle Corporation. All rights reserved.
http://localhost.localdomain:1158/em/conso...boutApplication
- An instance of Oracle Enterprise Manager 10g Database Control is already running.
-----------------------------------------------------------------------------------
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Jul 12, 2012
I have restored database with the name DB to another database called DB01
it is in STARTED status (not mounted) and it seems I can not change the name if it is not mounts, and I can not mount it because of the name, how to solve this issue if possible? I have RMAN full backup from DB on my current server which hosting the database DB01 the initdb01.ora is ready and configured with DB01
what can I do next
ORA-01103: database name 'DB' in control file is not 'DB01'
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Jan 22, 2013
I am trying to setup my environment to prepare for hands on DBA exercises from an OCM handbook for 10g -OCM:Oracle Database 10g Administrator Certified Master Exam Guide
I need access to the following files
gc_10205_part1of2.zip, gc_10205_part2of2.zip for 32 bit linux
Apparently the above along with other Grid software was once attainable from the link below but sometime between this year and the last Oracle decided to remove this and other software from public access. URL.....
I doubt Oracle will hear my plea - educational purposes only - so given I want access to the software only.
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Nov 8, 2012
I am getting the below error when I run utlrp in my database.
ERROR at line 1:
ORA-08102: index key not found, obj# 423571, file 6, block 113416 (2)
ORA-06512: at "SYS.UTL_RECOMP", line 760
ORA-06512: at line 4
I have run dbverify on File_id=6 but it did not return any corrupt pages or blocks.
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Feb 4, 2013
I am facing Deadlock issue in my transaction when record is been deleted in the same table in parallel from a PLSQL package. The package is been called from the Java code.The example and the table structure is given below.
Col1 of tab1 is foreign key to col1 of tab2.
Commit will not be done until all the below dml scripts are executed in both environment.
1st session:
Delete from tab1 where col1=1001;
Delete from tab2 where col1=2001;
Result: Deletion successful
2nd session:
Delete from tab1 where col1=1002;
Delete from tab2 where col1=2002;
Result: Deletion successful
1st session:
Delete from tab1 where col1=1003;
Delete from tab2 where col1=2003;
Result: Deletion successful
2nd session:
Delete from tab1 where col1=1004;
Delete from tab2 where col1=2004;
Result: Query is executing for a longer time.
1st session:
Delete from tab1 where col1=1003;
Delete from tab2 where col1=2003;
Result: Query is not executed and throws Deadlock in the back end.
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Oct 23, 2010
Can try this approach to recover:[URL]...
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Feb 13, 2012
I had a database on an old P4 running but the motherboard got fried. I was able to recover all the data files (.ctl and *.dbf) plus the redo logs (.log). There is no export or backup taken - I have old ones, but I need to recover the latest which only existed in the data files.
I now have Oracle installed on a new P5 machine and was wondering if it is possible to use these data files in the new database? If so, how do I go by restoring the data files?
Both the P4 and P5 where running Red Hat Linux.
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May 14, 2012
1)Is there a way to load two tables from two input files in one control file?
I have two control files.
LOAD DATA
INFILE 'C:
ame.txt'
BADFILE 'C:
ame.bad'
DISCARDFILE 'C:
[code]....
Can i load emp_tab and job_table using one control file and two input files name.txt and job.txt?
2)Is there a way to pass the path as a parameter in the control file?
In the job below, when i execute the sqlldr , can I pass C:/job.txt as an input instead of specifying it in control file?
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Jul 30, 2012
I observed logical corruption in one of the database, while running select on some tables observed ORA-01410: invalid ROWID error. These errors or errors related to this logical corruption are not reported in alert log file.
Since our database is in NOARCHIVELOG mode and regular backups are not happening through RMAN (weekly cold mount point backup to tape),
i was not able to use RMAN to investigate block corruption.
So used DBVERIFY on all datafiles of database to check the consistency of datafiles, and found DBV gives error for one of the datafile - 'Completely zero block found during dbv:' As i mentioned earlier, we are not taking regular backups using RMAN and database is in NOARCHIVE mode.
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Nov 14, 2012
I'm trying to modify my dbca template to include two control files. One on ASM +RECO and we we're thinking of adding the second one on the database filesystem $ORACLE_BASE/something/something Within the template there are references to controlfiles two places:
Initparameter:
<initParam name="control_files" value="("{ORACLE_BASE}/oradata/{DB_UNIQUE_NAME}/control01.ctl", "{ORACLE_BASE}/fast_recovery_area/{DB_UNIQUE_NAME}/control02.ctl")"/>
and
<StorageAttributes>
<ControlfileAttributes id="Controlfile">
<maxDatafiles>32767</maxDatafiles>
<maxLogfiles>1024</maxLogfiles>
<maxLogMembers>3</maxLogMembers>
<maxLogHistory>32767</maxLogHistory>
<maxInstances>8</maxInstances>
<image name="control01.ctl" filepath="{ORACLE_BASE}/oradata/{DB_UNIQUE_NAME}/"/>
<image name="control02.ctl" filepath="+RECO"/>
</ControlfileAttributes>
With this configuration there is only one controlfile created and that is on +RECO. What am I doing wrong and also should I add the second controlfile to +DATA instead of fielsystem $ORACLE_BASE?
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Mar 1, 2011
I've been using ASM for a few years now and have always installed a new system with 3 diskgroups
+DATA - for datafiles, control files, redo logs
+FRA - for achive logs, flash recovery. RMAN backup
Those I guess are the standards, but I've always created an extra (very small) diskgroup, called +ONLINE where I keep multiplexed copies of the redo logs and control files.
My reasoning behind this is that if there are any issues with the +DATA diskgroup, the redo logs and control files can still be accessed.
In the olden days (all those 5 years ago!), on local storage, this was important, but is it still important now? With all the striping and mirroring going on (both at ASM and RAID level), am I just being overtly paranoid? Does this additional +ONLINE diskgroup actually hamper performance? (with dual write overheads that are not necessary)
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Aug 2, 2010
I have a server with Red Hat EL 5.5 running an oracle database 10g R2 and an Oracle Agent 10.2.0.5The disk ran out of space and I realized that there are a lot of files stating with core.xxx such as :
-rw------- 1 gridagent oinstall 17M Aug 2 13:10 core.10348
-rw------- 1 gridagent oinstall 17M Aug 2 13:15 core.10827
-rw------- 1 gridagent oinstall 17M Aug 2 12:30 core.4129
-rw------- 1 gridagent oinstall 17M Aug 2 12:35 core.4772
What's that ?Why are those files generated at $AGENT_HOME/<HOST>_<SID>/sysman/log/ ?
There are more than 24 GB of those files
in nmc.log I can see lines such as:
NMC-00000 2010-08-02 13:25:39 [11760, nmcdbg.c,0440]TRC: Debug context enabled.
NMC-20020 2010-07-30 01:31:58 [23083, nmccole.c,0725]ERR: Could not collect using DSGA Collection method
NMC-20014 2010-07-29 01:31:56 [11258, nmccole.c,0822]ERR: Could not attach to the SGA
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Mar 29, 2011
I've got a legacy SAP system with oracle 8i on Tru64. No changes at all are made but for legal reasons we have to keep it up and running.
we currently do a full backup monthly by shutting down oracle and doing a backup of all the files to tape and that takes around 12 hours.
If I stop doing the full backup and I only backup the control file and the archived redo log files every month and I had to restore the full database years from now, would I be able to restore the database using the last full monthly backup and use the latest control file and archived redo log files?
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Oct 11, 2012
How can I know if database files are on file system or raw files?
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Jun 10, 2013
I am having a issue, we are trying to restore our db from control files using Symantec Backup exec, but job fails giving me error go to table spaces select all table spaces and unchecked roll forward.
i am unable to find way to uncheck the table spaces. Here is the complete description.
Cause
The system catalog tablespace "syscatspace" contains all of the system catalog information for the tables. Syscatspace needs to be rolled forward first, and then the other tablespaces must be rolled forward.
Solution
Workaround:
When the restore operation is run from a tablespace level backup, perform the rollforward for the syscatspace tablespace first and then for other tablespaces.
Execute the rollforward operation as a DBA operation. The sequence of the recovery process should be as follows:
1. Select all tablespaces, uncheck the rollforward option and run the restore job.
2. Run the rollforward operation as a DBA initiated operation:
rollforward syscatspace to point in time / end of logs. e.g. db2 => rollforward database UEXIT to end of logs and complete Tablespace (SYSCATSPACE) online
3. Perform rollforward of all other tablespaces.
e.g. db2 => rollforward database UEXIT to end of logs and complete tablespace (SYSTOO LSPACE,USERSPACE1) online
Refer to IBM DB2 documentation for more information on DBA-initiated operations.
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Jan 26, 2012
I have an oracle autoback of controlfile and spfile. I am trying to restore the production database using this backup, into a new server with a different directory structure.
I have completed the following steps in the restore process.
1. Creating a pfile from spfile
2. Changing the the location of cdump, udump, bdump and the control files ( there are three )
3. Then creating a spfile from this pfile
I am stuck on the next step where to rename all the datafiles and tempfile and restore the database. Following is what I did.
After mounting the database in RMAN, tried to run the following.
RMAN> run
2> {
3> allocate channel c1 device type disk
4> ;
5> @/home/oracle/rman_scripts/newloc.rman
6> SET NEWNAME FOR DATAFILE 1 TO '/u02/oradata/dorian/system01.dbf';
7> SET NEWNAME FOR DATAFILE 2 TO '/u02/oradata/dorian/undotbs01.dbf';
8> SET NEWNAME FOR DATAFILE 3 TO '/u02/oradata/dorian/sysaux01.dbf';
9> SET NEWNAME FOR DATAFILE 4 TO '/u02/oradata/dorian/users01.dbf';
[code]....
I am getting the following error message.
Starting restore at 25-JAN-2012 21:26:48
released channel: c1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 01/25/2012 21:26:49
RMAN-06026: some targets not found - aborting restore
RMAN-06100: no channel to restore a backup or copy of datafile 30
RMAN-06100: no channel to restore a backup or copy of datafile 29
RMAN-06100: no channel to restore a backup or copy of datafile 28
[code]....
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Mar 14, 2012
How one should know whether RMAN is using target database control file or using separate catalog database. Also what one should do if he dont have catalog users credentials.
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Feb 8, 2011
The documentation for v$database says: QUOTE V$DATABASE displays information about the database from the control file. Is it safe to assume that there will only ever be one row queried from this view?
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Nov 12, 2012
I have a 11.2.0.3 database runing on AIX. The instance hangs and crashes due to memory usage issues. I checked the alert log of the database and this is what i see:
WARNING: Heavy swapping observed on system in last 5 mins.pct of memory swapped in [11.85%] pct of memory swapped out [3.45%]. make sure there is no memory pressure and the SGA and PGA are configured correctly. Look at DBRM trace file for more details.i also see the following in the alert.log:
Errors in file
/opt/oracle/diag/rdbms/iut3px1/iut3px1/trace/iut3px1_cjq0_55312404.trc:
ORA-00604: error occurred at recursive SQL level 2
ORA-04031: unable to allocate 3896 bytes of shared memory ("shared pool","select audit$,options from p...","sga heap(1,0)","kglsim object batch")
The file contents of iut3px1_cjq0_55312404.trc are:
====================
Process State Object
====================
----------------------------------------
SO: 0x70000007b97de70, type: 2, owner: 0x0, flag: INIT/-/-/0x00 if: 0x3 c: 0x3
proc=0x70000007b97de70, name=process, file=ksu.h LINE:12616 ID:, pg=0
[code]...
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Apr 11, 2013
I want to delete archivelogs from ASM and want to schedule a script for same in crontab.
Also i removed archives manually from asmcmd.But when i runned below command,i didn't observed any change in the free_space.
select total_mb,free_mb,(total_mb-free_mb) used from v$asm_diskgroup;
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Jun 1, 2013
We have an Oracle 9i (9.2.0.7) two-node RAC database running on Solaris 5.8. Recently we have switched our production database from no archive log mode to archive log. We changed the parameter CLUSTER_DATABASE=FALSE on one of the instances before converting and reverted back.why this parameter needs to be changed to false?
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Sep 15, 2010
I have a unix script that will check if the database is up and running. I need a similar script but this time in windows batch file.
this is the snippet of the code from the unix script:
#! /bin/sh
sqlplus -s /nolog > /dev/null 2>&1 <<EOF
whenever sqlerror exit failure
[Code].....
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Jun 15, 2012
How can we clean a tablespace(delete all the contents) without dropping the tablespace.
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Apr 21, 2012
how to write the package for deletion?
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Apr 1, 2011
How can we add another control file to DBOG database? I need to clarify all the steps during this process.
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Oct 22, 2010
I have setup of two node (prod-db1, prod-db2) clustered database 11gR2 on windows 2008 R2 server. Everything is working fine at this setup.
My question is: Is there a way to make the Enterprise manager Database control run and be available at both the nodes independently. What I see that even at node 2 (which is prod-db2) the EM-DBControl is (https://prod-db1:1158/em) - which means the agent is running at node 1 (prod-db1) only.
My question is that how to make the EM-DBControl also run separately at prod-db2. My idea is to make the high availability of EM-DBControl (in case Prod-db1 machine is down).
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Sep 30, 2010
i want to control our session in database oracle10g which means that:x is not allowed to connect to the database, if x try to connect to the database his session will be blocked and a message must be sent to the administrator.
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Oct 10, 2013
Oracle Enterprise Manager 11g Database Control Release 11.2.0.1.0 Agent is running, dbconsole too. to the database through SQL Developer and SQL Plus connects. when you go to localhost:1158/em opens a BLANK PAGE that contains 2 "squiggles" view"|[ ]]" tried in different browsers, identical. a feeling that most web interface is physically not in folders.
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Nov 12, 2009
I was install windows 7 on my computer,oracle database10g and forms 10g installed successfully. I Cannot run forms on the browsers , how i can run my programs
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