How To Check For Datafile Corruption Or Error

Oct 12, 2010

How can i check for datafile corruption or a datafile error,its some tool like Linux (fsck) command in Oracle that can halp to me to chack a datafile?.

Is any way to isolate the disk region that is corrupted?

If a disk error exist an an ASM disk group how can i isolate the error from that disk group? It's an alternative different to the VALIDATE DATAFILE command in RMAN?I'm using Oracle 11GR2 on a Linux Box.

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Backup & Recovery :: Block Corruption In System Datafile?

Dec 25, 2011

I have noticed a block corruption issue in my RAC database. Its an index , how to recover a corrupted index in system datafile.

SELECT tablespace_name, segment_type, owner, segment_name
FROM dba_extents WHERE file_id = 5
3 and 147551 between block_id AND block_id + blocks - 1;
TABLESPACE_NAME SEGMENT_TYPE OWNER

[code]....

We are using OCFS2 and O/S is RHEL 4.7.

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SQL & PL/SQL :: Check Availability Of Datafile For ETL Process?

Mar 26, 2010

develop a Oracle stored function or procedure to confirm a availability of datafile on a specific local directory to be read by Oracle External table. The fine looks like filenameddmmyyyy.csv.

I have create a Oracle directory named data_dir that is mapped with physical directory c: mep

Once it is confirmed that datafile is available the ETL process is started.

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Logical Corruption In Oracle Database - Invalid RowID Error

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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Error While Using SQL Loader - Bad Datafile Datatype For Column RANGE

Apr 29, 2011

I am trying to load the data from .csv file into the table using SQL Loader.

The table has the following schema:
src_id : number,
dest_id : number,
range: intsys.interval_typ --- > a type containing (lower,upper)
payload : varchar2(100)

The loader.ctl file is :

load data
infile *
append
into table sb_packet
fields terminated by "," optionally enclosed by ' " '
(src_id,dest_id,range,payload)
BEGINDATA
3,32,intsys.interval_typ(10043,142703),"misc data"

When I use the following this ctl file to transfer the data, i get the following error:

SQL*Loader-418: Bad datafile datatype for column RANGE

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Server Administration :: How To Check Error ORA-01555 / Snapshot Too Old

Dec 23, 2011

i am getting this error during expdp ORA-01555 -snapshot too old

1. i increased undo_retention i.e 50000

2. i execute expdp during late night when almost zero user is online so no commit from any other session.

3. we have a table having BLOB data type field in a table which is 500 GB in size.complete DB size is 700 GB

where and why this error exists.if corruption of BLOB so how to check that etc. the same error is occurring in three of our data centres during expdp.

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Forms :: Put One Check Box To Check All The Check Boxes?

Jul 30, 2011

I want to put one check box to check all the check boxes.how can i do this?

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SQL & PL/SQL :: DB Locks And Data Corruption?

Feb 25, 2012

I have a sql script where triggers, procedures and functions are written. The triggers are causing db outages and causing problems in the application as well.

I am trying my best but with my low experience and expertise, am not able to make good progress.

Scenario: Course enrollments are inserted, deleted and updated in course_main and course_users table. This is done in gui as well as in background snapshot scheduler in a cron process. Course_main table contains all course enrollments and course_users table has crsmain_pk1 as foreign key.

Its quite a big file and am not sure what should i paste here so am uploading the file in txt.

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Index Corruption In Database?

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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RMAN Active Clone And Corruption

Feb 11, 2011

I am cloning my prod db to test with the rman active clone command. I can successfully clone my DB, but after a few hours or so I see messages in the alert log that I have corrupted blocks in several datafiles. Note, i dont see these messages in my PROD DB therefore I think that DB has no corruption. I have few questions:

1) I was reading tha having tables or indexes set with the NOLOGGING option can cause objects to be unrecoverable. Would this affect my active clone?

2) I know you can either change a DB or tablespace to force logging. Is there a query I can use to determine if the DB is in force logging mode.

ALTER TABLESPACE tablespace_name FORCE LOGGING;
ALTER DATABASE FORCE LOGGING;

3) Lastly how to check as why my clone DB would have corrupted blocks.

Here is the clone command I am using.

rman catalog=rman/rman@proddb target=sys/sys@proddb << EOT
connect auxiliary sys/sys@clonedb
duplicate target database to clonedb from active database nofilenamecheck
pfile=/u01/app/oracle/product/11g/dbs/initclonedb.ora ;
exit
EOT

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Possible To Recover BLOCK Corruption With Exp Backups

Jul 9, 2013

While taking a full export i came to know there was a block corruption in SYSAUX tablespace. I dont have any COLD/HOTBACKUPS/RMAN BACKUPS. As i have only the Exp backups and the database is in archive log mode. Whether is it possible to recover the BLOCK CORRUPTION with exp backups.

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Backup & Recovery :: Block Corruption In Expdp?

Feb 15, 2011

I am facing issue of block corruption in my exp backup which I am taking through expdp command. (Refer Attachment of Screen shot of error)

I want to know few things about the block corruption.

1. Why the block corruption occur.

2. How can I resolve this.

3. Can I rosolve this by deleting the same record on which this error is coming. if yes then how can I track that row in a table.

I already tried for DB verify utility. It shows the below result.

===================================================================
C:Documents and SettingsAdministrator>dbv file='E:ORADATAAFCCV1MONETA01.DBF' blocksize=8192
DBVERIFY: Release 11.1.0.6.0 - Production on Wed Feb 16 10:13:11 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
DBVERIFY - Verification starting : FILE = E:ORADATAAFCCV1MONETA01.DBF
DBV-00600: Fatal Error - [28] [27070] [0] [0]
C:Documents and SettingsAdministrator>
================================================================

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Backup & Recovery :: Restore Terminated Due To Log Corruption

Jul 18, 2012

I am trying user managed recovery using archived and redo log files. I had restored old cold backup, then copy latest control file, redo log files, and archived log files at actual locations. Now I tried to recover database using following steps.

Quote:
connect sys as sysdba
startup mount;
recover database;
auto

After applied some archived files, one of the archived file corrupted and recovery cancel due to error, then i shut down the database. Now i want to copy corrupted archived file from backup and run the recovery further. so my question that should i have to run recovery from the beginning or can i run the recover from the last status of the database.

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Server Administration :: Data Block Corruption

May 12, 2011

1) What is PHYSICAL/LOGICAL Corruption.
2) How it occurs.
3) Will RMAN works on both the types of corruption or only Physical (My senior told it works on both).

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Backup & Recovery :: How To Find Corruption Block

Jun 9, 2012

how to find the corruption block and judge whether it is physical corruption or logical corruption?

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Replication :: Block Corruption While Accessing Some Table

Mar 16, 2011

The database is running in archivelog mode and we have a standby with Maximum performance.There is no RMAN backup..We have noticed there is block corruption while accessing some tables.Now i would like to know are the corrupted blocks also replicated to the physical standby? Is there a way to recover the data from these corrupted blocks without shutting down the database ?

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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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Server Administration :: Block Corruption - Segment Not Found

May 16, 2012

I have a database where view v$database_block_corruption shows a corrupted block

SQL> select * from v$database_block_corruption;

FILE# BLOCK# BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
4 756652 1 5.5157E+12 CORRUPT

I am not able to get the relevant segment from the above information

SQL> select segment_name, segment_type, owner
2 from dba_extents
3 where file_id = 4
4 and 756652 between block_id
5 and block_id + blocks -1;

no rows selected

DBVERIFY Summary
DBVERIFY - Verification complete
Total Pages Examined : 3932160
Total Pages Processed (Data) : 3119107
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 755048

[code]....

I have uploaded the complete logfile.

Below is a part of logfile

DBVERIFY - Verification starting : FILE = /prd/dvp/ora/oradata/LHF/disk06/gds_t01_01.dbf
Block Checking: DBA = 21728172, Block Type = KTB-managed data block
**** kdxcoavs = -84 < 0, avail = 3129
---- end index block validation
Page 756652 failed with check code 6401
##not here that 756652 is the same block# mentioned in v$database_block_corruption

here i tried finding the OBJECT ID as below

SELECT dbms_utility.data_block_address_block(21728172) "BLOCK", dbms_utility.data_block_address_file(21728172) "FILE" FROM dual;
BLOCK FILE
---------- ----------
756652 5

Now for the same BLOCK it is giving different File, again the segment_name or segment_id could not be found from the above information.

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Server Administration :: Ora / 1043 User Side Memory Corruption

Nov 20, 2002

I'm using Oracle8i, with VB6 as front end When i try to connect Oracle using RDO in VB i get an error message from Oracle It is S1000:Oracle ODBC.ora Ora:1043 User Side Memory Corruption.

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Backup & Recovery :: Ora-01578 - Oracle Data Block Corruption

Jun 24, 2013

We are facing block corruption error and it's refer to system datafile (SYSTEM01.DBF).Below is the script through it, we can come to know about the extent.

select segment_name, segment_type from dba_extents
where file_id=1 and 134144 between block_id and block_id+blocks-1;

select owner,index_name,index_type, table_name from dba_indexes
where index_name='I_CDEF3';

How to resolve the problem as it is related to system datafile? We tried to drop the index but system is not allowing to do.

ORA-00701 - object necessary for warmstarting database cannot be altered.

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Backup & Recovery :: Logical Block Corruption - Recreate SYSMAN Schema Index

Mar 3, 2010

I am facing problem of logical block curruption.

SQL> select * from v$database_block_corruption;

FILE# BLOCK# BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
3 61454 1 1417157166 LOGICAL
3 31256 1 1417011117 LOGICAL

OWNER CONSTRAINT_NAME C TABLE_NAME
------------------------------ ------------------------------ - ------------------------------
SYSMAN MGMT_METRICS_RAW_PK P MGMT_METRICS_RAW

Can i recreate the SYSMAN schema index by dropping this one?

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Datafile 11 - Not Exists

Aug 3, 2009

i see in my alert.log this message:

Errors in file /oracle/BWP/saptrace/usertrace/bwp_ora_2728058.trc:
ORA-01114: IO error writing block to file 1030 (block # 602122)
ORA-27063: number of bytes read/written is incorrect
IBM AIX RISC System/6000 Error: 28: No space left on device
Additional information: -1
Additional information: 180224

But this file_id i don't have in my database, i am making these queries:

SQL> select FILE_ID from dba_temp_files order by FILE_ID;

FILE_ID
----------
1
2
3
4
5
6
7
8
9
[code]....

I don't have this file_id, why alert.log is showing me it? Of course, nobody has created this datafile and nobody has removed it too.

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PL/SQL :: Order By On Datafile Name

Sep 4, 2013

I am using 11GR2 and looking to find out a way , where in I able to extract the data files name in such a manner , where it lists data file in order of mount points. say data1 first and then so on.. Snippet from my data files

output. /db/ptmtrain/data1/system01.dbf/db/ptmtrain/data2/sysaux01.dbf/db/ptmtrain/data1/undotbs01.dbf/db/ptmtrain/data3/tools01.dbf/db/ptmtrain/data24/users01.dbf/db/ptmtrain/data25/users02.dbf/db/ptmtrain/data26/users03.dbf/db/ptmtrain/data2/rbs01.dbf/db/ptmtrain/data3/rbs02.dbf/db/ptmtrain/data2/rbs03.dbf/db/ptmtrain/data23/sans01.dbf 

should be something

like /db/ptmtrain/data1/system01.dbf/db/ptmtrain/data1/undotbs01.dbf/db/ptmtrain/data2/sysaux01.dbf/db/ptmtrain/data2/rbs03.dbf/db/ptmtrain/data2/rbs01.dbf/db/ptmtrain/data3/tools01.dbf/db/ptmtrain/data3/rbs02.dbf/db/ptmtrain/data23/sans01.dbf/db/ptmtrain/data24/users01.dbf/db/ptmtrain/data25/users02.dbf/db/ptmtrain/data26/users03.dbf  

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How To Shrink A Datafile

Feb 13, 2013

Database Version :11gR2

I have a tablespace which has around 32gb space consumed. But if i check the used space then its only 16GB. When i tried to resize the datafile it throws the error

ORA-03297: file contains used data beyond requested RESIZE valueAs per my understanding there are not continous blocks which are there in datafile due to fragmentation may be and there by not able to resize it. If i export the tablespace using datapump and reimport this will release the space.

But i want to know if there are any alternative ways to do the same.

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Moving Data From Datafile

Mar 7, 2011

In my Production DB. 5 Datafiles created in same tablespace. Datafile size is of 25GB. Data stored in all Datafile. Data is just 5GB in all datafile. I want to move data from 5 datafiles to single or couple of datafiles.

This is in Oracle 11g.

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Tablespace Autoextend Datafile

Apr 18, 2007

I have a small problem, i will try to explain it, My tablespaces are Automatically extend datafile when full (AUTOEXTEND). It had checked "autoextend ON" checkbox.

What I need to know is, when happened that autoextend accion(day/hour), is it possible?.

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COALESCE Or Shrinking Datafile?

Sep 6, 2010

We have quarterly and yearly processes that deletes and updates data for millions of rows crossing different tables. To make room on the file system I would either like to remove empty datafiles (my preference) or coalesce TS to compact the data than remove the empty datafile.

Having said that, any query that can show me if a datafile has any data in it or a query that can show me whether a TS is a good candidate to be coalesced maybe a query with something displaying a percentage as to free and used extents and a YES/NO column whether to be coalesced or not.

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SQL & PL/SQL :: Datafile For External Table?

Mar 9, 2010

Every day we have use different data file for an external table to read from.

filename like this "filenameddmmyyyy"

Every day, I have to change name of datafile in external table script which is not a good way.

I want the automated way for external table to read the latest datafile from specified directory.

Further, there is anyway that we could know that the latest data file is available for external table.

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RMAN :: Backup Of A Datafile?

May 20, 2013

Suppose our database have 100 datafiles and right now rman has completed backup of 64 datafile(from file no 1 to file no 64) and in process of backup of 65 number datafile. In mean time I executed some query and it has changed the file no 55. so now my question whether rman will go and bacup this datafile(datafile no 55) again or it will leave this file as it is?

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How To Change Datafile Path

May 13, 2013

I need to change data file path, and i got some document also but one thing confusing me, we need to offline the Tablespace, so my concern is all the table space like system, sys, user, temp etc. need to offline and then alter the database?

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