Gurgaon, Haryana May 13th 2011- Stellar Information Systems Ltd, pioneers in the field of data recovery solutions and services, today releases the upgraded version of its Oracle Recovery software. The new enhanced version Stellar Phoenix Oracle Recovery v3.0 is an ideal utility to perform a precise recovery of all schema objects in your Oracle database. In addition to recovering simple tables, views, indexes, clusters etc., the software efficiently restores different Index Organized Tables (IOT), Nested tables, Nested Object types, and Nested Array types etc.
Showing posts with label dbf recovery. Show all posts
Showing posts with label dbf recovery. Show all posts
Wednesday, May 18, 2011
Wednesday, April 20, 2011
ORA-00083 Error and Reliable Oracle Recovery Application
Oracle RDBMS is a widely used relational database application of the recent time. Many home users, small enterprises as well as large industries use Oracle database as their major back-end support. The application has been developed by the Oracle Corporation and marketed as one of the robust database. But, the fact is that every application has its limitations and Oracle also has its due. In this context, sometimes, the memory of the Oracle database gets corrupted, resulting in the complete inaccessibility of the database and the data in it. Under such cases of data loss or inaccessibility, you can run any Oracle recovery software to recover the seemingly lost data back.
In an Oracle database, the memory is categorized into four different parts, such as SGA, PGA, UGA and CGA. SGA is responsible for keeping information regarding the duration of the instance. PGA keeps information about the processes, UGA keeps the session information and CGA keeps the information about the duration of a call. All these structures in the Oracle memory links to different data blocks and hence, any alteration or corruption in any of them can cause the instability of the database.
Sometimes while trying to access an Oracle table you may come across the below error message:
"ORA-00083: warning: possibly corrupt SGA mapped"
After receiving the error message, your database instance becomes inaccessible and you need to resolve the issue for accessing the data in the database.
The reason behind the above error can be pretty straight. The SGA or the System Global Area has been corrupted and the corrupt part of the SGA has been accessed by the process. That is the reason the instance has displayed the above error message and got terminated.
In order to resolve the issue, you need to up the instance by shutting down the database instance from its home page and again Startup the instance following entering its correct credentials. Remember to give the correct credentials of the database both after shutting down and before starting up the instance. Moreover, refresh after shutting down the instance.
This process may solve the problem and you will be able to access the data again. However, if it fails, you need to take the help of any Oracle database recovery software to do the job.
These dbf recovery utilities are extremely read-only in their operations and recover Oracle database with its original structure intact.
Stellar Phoenix Oracle Database Recovery is a highly reliable utility to recover your lost or inaccessible Oracle database under any instance of database corruption. The software is compatible with Windows Server 2003, XP and can work on Oracle 9i, 10g and 11g.
My name is Mark Willium, I am doing research on Oracle recovery software that repair and restore corrupted dbf files.
Article Source: http://EzineArticles.com/?expert=Mark_Willium
Article Source: http://EzineArticles.com/6076378
In an Oracle database, the memory is categorized into four different parts, such as SGA, PGA, UGA and CGA. SGA is responsible for keeping information regarding the duration of the instance. PGA keeps information about the processes, UGA keeps the session information and CGA keeps the information about the duration of a call. All these structures in the Oracle memory links to different data blocks and hence, any alteration or corruption in any of them can cause the instability of the database.
Sometimes while trying to access an Oracle table you may come across the below error message:
"ORA-00083: warning: possibly corrupt SGA mapped"
After receiving the error message, your database instance becomes inaccessible and you need to resolve the issue for accessing the data in the database.
The reason behind the above error can be pretty straight. The SGA or the System Global Area has been corrupted and the corrupt part of the SGA has been accessed by the process. That is the reason the instance has displayed the above error message and got terminated.
In order to resolve the issue, you need to up the instance by shutting down the database instance from its home page and again Startup the instance following entering its correct credentials. Remember to give the correct credentials of the database both after shutting down and before starting up the instance. Moreover, refresh after shutting down the instance.
This process may solve the problem and you will be able to access the data again. However, if it fails, you need to take the help of any Oracle database recovery software to do the job.
These dbf recovery utilities are extremely read-only in their operations and recover Oracle database with its original structure intact.
Stellar Phoenix Oracle Database Recovery is a highly reliable utility to recover your lost or inaccessible Oracle database under any instance of database corruption. The software is compatible with Windows Server 2003, XP and can work on Oracle 9i, 10g and 11g.
My name is Mark Willium, I am doing research on Oracle recovery software that repair and restore corrupted dbf files.
Article Source: http://EzineArticles.com/?expert=Mark_Willium
Article Source: http://EzineArticles.com/6076378
Wednesday, March 23, 2011
The advanced Oracle recovery utility to retrieve your inaccessible Oracle database files safely
After opening an instance of Oracle, the application needs a database to be allocated to it. This allocation of database is known as ‘mounting’ and only after a successful mounting you can work on the database. But, sometimes, either due to the corruption of the database or any other application contradiction, you failed to mount the database. This results in the inaccessibility of your valuable data in the Oracle database and you need to look for any Oracle recovery utility to retrieve the data back.
During your day to day work, you tried to mount the Oracle database as the database administrator, but the database couldn't be initiated leaving all the data residing in it completely inaccessible.
Causes:
Among many possible reasons behind the above problem, below listed are some of the most probable ones:
There can be virus/malware infection, file system corruption, operating system malfunction or any other application contradiction, which may have resulted in the corruption of the Oracle database file.
Resolution:
In order to resolve the problem and access your data in the troubled Oracle database, follow the below written corrective measures:
If you failed to resolve the problem and still unable to access the database, you can restore the database files from the previously taken valid stable backup. But, if you do not have a valid backup of your database, still you can use any Oracle database recovery software to retrieve the files back.
These powerful dbf recovery software can repair the corrupt Oracle database and can help you restore all its objects. These utilities are read-only in their operations and recover Oracle databases with their internal structure being intact.
Stellar Phoenix Oracle Database Recovery is a reliable Oracle recovery software to recover corrupted or damaged databases created through Oracle 9i, 10g and 11g. The software works on Windows 2003, XP and with highly interactive graphical user interface, the software can be comfortably used without much technical knowledge.
Resource: http://www.articleslash.net/Computers-and-Technology/Data-Recovery/602966__The-advanced-Oracle-recovery-utility-to-retrieve-your-inaccessible-Oracle-database-files-safely.html
During your day to day work, you tried to mount the Oracle database as the database administrator, but the database couldn't be initiated leaving all the data residing in it completely inaccessible.
Causes:
Among many possible reasons behind the above problem, below listed are some of the most probable ones:
- The user account, through which you ran the database instance may have not proper privileges to mount the database.
- You have given some wrong parameters to open the the specified file.
- The particular database file has been corrupted or damaged.
There can be virus/malware infection, file system corruption, operating system malfunction or any other application contradiction, which may have resulted in the corruption of the Oracle database file.
Resolution:
In order to resolve the problem and access your data in the troubled Oracle database, follow the below written corrective measures:
- Ensure that the account through which you are trying to mount the Oracle database, do not have the mounting rights. Either change the access rights of the account or try with any other account with proper access privilege.
- Ensure that the parameters used in the command to mount the database are correct. Also, check that the particular parameter file is at its default location.
If you failed to resolve the problem and still unable to access the database, you can restore the database files from the previously taken valid stable backup. But, if you do not have a valid backup of your database, still you can use any Oracle database recovery software to retrieve the files back.
These powerful dbf recovery software can repair the corrupt Oracle database and can help you restore all its objects. These utilities are read-only in their operations and recover Oracle databases with their internal structure being intact.
Stellar Phoenix Oracle Database Recovery is a reliable Oracle recovery software to recover corrupted or damaged databases created through Oracle 9i, 10g and 11g. The software works on Windows 2003, XP and with highly interactive graphical user interface, the software can be comfortably used without much technical knowledge.
Resource: http://www.articleslash.net/Computers-and-Technology/Data-Recovery/602966__The-advanced-Oracle-recovery-utility-to-retrieve-your-inaccessible-Oracle-database-files-safely.html
Wednesday, March 2, 2011
Advanced Oracle database recovery utility to deal with ORA-00376 error
The data in an Oracle database is stored at different levels, including the table space, segments, extents, blocks etc. Prior to access the database, all the database objects need to be mounted properly. But, if the database has been damaged or corrupted, then it fails to mount and all the data in the database becomes inaccessible. The reason can be anything, such as a virus attack, file system corruption, database header corruption etc. In any of these situations, in order to recover back the data from the tables, you have to repair Oracle database. There are many third-party Oracle database recovery utilities available for the same.
You may encounter the below error message while mounting any Oracle 9i database:
“ORA-00376: file xx cannot be read at this time”
Cause:
The most possible reason behind the error message can be the corruption of the ‘UNDO tablespace’. This is the reason that you failed to mount the database and you will continue receiving the same error message each time you try to mount the database.
Resolution:
Following steps can guide you repairing Oracle database:
- Change the parameter related to ‘undo_management’ from Auto to Manual.
- Create a new ‘UNDO tablespace’.
- Drop the previous ‘UNDO tablespace’.
- Try mounting the database.
Oracle database corruption usually acts at the lowest level that id the table space level and sometimes, when you drop the troubled table space, it creates some more problems. In such situation, you receive the below error message:
“ ORA-00376: file string cannot be read at this time”
Such situations of harsh database corruption issues can only be dealt with advanced dbf recovery utilities. These utilities are designed to repair and recover Oracle database under any instance of corruption. These software are extremely reliable in all their operations and do not change or modify the structure of the database. Moreover, with highly interactive graphical user interfaces, you need have to worry a little regarding the functionalities of these software.
Stellar Phoenix Oracle Database Recovery is a powerful as yet reliable Oracle database recovery software, which can help you repair your database and recover all its objects safely. The software is absolutely risk-free and recovers the database with its internal structure being completely intact. The software works on the database files created with Oracle 9i, 10g, 11g and is compatible with Windows Server 2003, XP.
Wednesday, February 16, 2011
Safe Oracle Database Recovery Utility to Repair Oracle Database and Recover Your Data
Oracle is one of the mostly used relational database management system of the current time. The application is platform independent, fast and secure in its operations. These are the reasons, for which many organizations as well as individual users use Oracle to store and manage their important data. Sometimes, operating system crash, file system corruption, virus/malware attack or any other application malfunction leads to the corruption of Oracle database. These result in the complete inaccessibility of valuable data stored in the database and in order to get them back, you need any efficient Oracle database recovery utility.
Take a common instance of Oracle database corruption issue, where you made a cold backup of the database and archived the generated log file. But, when you tried to open the particular database, you failed to do so following an error message from the application. The error message, which you received, can be written as below:
"ORA-00353: log corruption near block change time "
Cause:
The most possible reason behind the occurrence of the error message is that the Oracle database has got corrupted.
Resolution:
It is a general convention for all the Oracle database users that whenever your redo log file gets corrupted or missing, just open the database with the ‘RESETLOGS’ option. This option can create the log file once again and the database can be restored. Following steps may guide you through the process:
Set the closing parameter of the database with the option, ‘SHUTDOWN NORMAL’.
Set the parameters, ‘STARTUP MOUNT’ and ‘ALTER DATABASE OPEN RESETLOGS’.
In case the database asks for its recovery, choose the option, ‘UNTIL CANCEL’. Apply the same to all archive and redo logs.
Issue the ‘CANCEL’ and ‘ALTER DATABASE OPEN RESETLOGS’ commands.
Wait a while for Oracle to accomplish the job. Then, issue ‘SHUTDOWN NORMAL’.
Remove the above set parameters and issue ‘STARTUP’.
Check the file, ‘ALERT.LOG’ again for errors.
Try to extract the data and rebuild the database.
If the above steps fail to resolve the problem, then, just look into your backup server for a valid copy of the database. However, if you do not have any valid backup, you are left with a single choice to run a dbf recovery software to recover Oracle database.
Stellar Phoenix Oracle Recovery software is an innovative utility to repair Oracle database under any instance of corruption and recovers the tables, schema, roles, forms etc with their integrity being intact. This Oracle database recovery software is absolutely risk-free I all its repair and recovery operations.
http://www.articleslash.net/Computers-and-Technology/Data-Recovery/600001__Safe-Oracle-Database-Recovery-Utility-to-Repair-Oracle-Database-and-Recover-Your-Data.html
Take a common instance of Oracle database corruption issue, where you made a cold backup of the database and archived the generated log file. But, when you tried to open the particular database, you failed to do so following an error message from the application. The error message, which you received, can be written as below:
"ORA-00353: log corruption near block change time "
Cause:
The most possible reason behind the occurrence of the error message is that the Oracle database has got corrupted.
Resolution:
It is a general convention for all the Oracle database users that whenever your redo log file gets corrupted or missing, just open the database with the ‘RESETLOGS’ option. This option can create the log file once again and the database can be restored. Following steps may guide you through the process:
Set the closing parameter of the database with the option, ‘SHUTDOWN NORMAL’.
Set the parameters, ‘STARTUP MOUNT’ and ‘ALTER DATABASE OPEN RESETLOGS’.
In case the database asks for its recovery, choose the option, ‘UNTIL CANCEL’. Apply the same to all archive and redo logs.
Issue the ‘CANCEL’ and ‘ALTER DATABASE OPEN RESETLOGS’ commands.
Wait a while for Oracle to accomplish the job. Then, issue ‘SHUTDOWN NORMAL’.
Remove the above set parameters and issue ‘STARTUP’.
Check the file, ‘ALERT.LOG’ again for errors.
Try to extract the data and rebuild the database.
If the above steps fail to resolve the problem, then, just look into your backup server for a valid copy of the database. However, if you do not have any valid backup, you are left with a single choice to run a dbf recovery software to recover Oracle database.
Stellar Phoenix Oracle Recovery software is an innovative utility to repair Oracle database under any instance of corruption and recovers the tables, schema, roles, forms etc with their integrity being intact. This Oracle database recovery software is absolutely risk-free I all its repair and recovery operations.
http://www.articleslash.net/Computers-and-Technology/Data-Recovery/600001__Safe-Oracle-Database-Recovery-Utility-to-Repair-Oracle-Database-and-Recover-Your-Data.html
Sunday, February 6, 2011
Recover Oracle Database Successfully by Oracle Recovery Tool
Oracle database is a relational database, which is developed and designed by the Oracle corporation. Many reputed government and private companies use oracle database for managing and organizing their valuable data. The database administrator use DML command for manipulating the oracle database and other users access the database records by their need. Because of this regular updation in the oracle database sometimes oracle database gets corrupted and data stored in the database are inaccessible. To recover from this situation you should use an advanced oracle recovery tool to fix the issue.
This regular updation is not only the factor that damaged or corrupt oracle database. There are so many other internal and external agents that damaged oracle database like application problem, malfunction of database, virus attack, incompatible database version, connectivity problem, hardware issue, power failure and many more. These all make oracle database inaccessible and useless.
When an oracle database gets damaged or corrupted reflects some error message. Some of the error messages is given below:
ORA-01053: user storage address cannot be read
ORA-01079: Oracle database was not properly created, operation aborted
ORA-01043: user side memory corruption
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ORA-01073: fatal connection error: unrecognized call type
ORA-01099: cannot mount database in SHARED mode if started in single process mode
ORA-00376: file xx cannot be read at this time
So for the smooth functioning of your oracle database, you should use an advanced oracle database recovery software to fix the problem. There are so many third party recovery software for oracle are available in the market to repair oracle database. These advanced oracle recovery software throwly scan the corrupted oracle database and restore them at default location or user specified location.
Stellar Phoenix Oracle Database Recovery software is an advanced tool to repair Oracle database and restore its various objects. The software has been designed to recover the oracle database created through Oracle 11g, 10g, 9i and compatible with Windows 2003, Vista, XP and 7. The software has many interesting features, such as recovery of selective database objects, previews of all the recoverable objects prior to original recovery. Moreover, the interactiveness of this Oracle recovery software, which is an added plus for the users who does not have much technical knowledge to operate these kinds of recovery software.
Resource: http://www.americanchronicle.com/articles/view/212353
This regular updation is not only the factor that damaged or corrupt oracle database. There are so many other internal and external agents that damaged oracle database like application problem, malfunction of database, virus attack, incompatible database version, connectivity problem, hardware issue, power failure and many more. These all make oracle database inaccessible and useless.
When an oracle database gets damaged or corrupted reflects some error message. Some of the error messages is given below:
ORA-01053: user storage address cannot be read
ORA-01079: Oracle database was not properly created, operation aborted
ORA-01043: user side memory corruption
Whorush: 21 sites by this AdSense ID
ORA-01073: fatal connection error: unrecognized call type
ORA-01099: cannot mount database in SHARED mode if started in single process mode
ORA-00376: file xx cannot be read at this time
So for the smooth functioning of your oracle database, you should use an advanced oracle database recovery software to fix the problem. There are so many third party recovery software for oracle are available in the market to repair oracle database. These advanced oracle recovery software throwly scan the corrupted oracle database and restore them at default location or user specified location.
Stellar Phoenix Oracle Database Recovery software is an advanced tool to repair Oracle database and restore its various objects. The software has been designed to recover the oracle database created through Oracle 11g, 10g, 9i and compatible with Windows 2003, Vista, XP and 7. The software has many interesting features, such as recovery of selective database objects, previews of all the recoverable objects prior to original recovery. Moreover, the interactiveness of this Oracle recovery software, which is an added plus for the users who does not have much technical knowledge to operate these kinds of recovery software.
Resource: http://www.americanchronicle.com/articles/view/212353
Monday, January 24, 2011
Hidden Parameters to Access Corrupt Oracle Databases
Is your Oracle database inaccessible due to corruption? Are you unable to open a corrupt database and extract information from it? You may face critical situations, if you are an Oracle data base administrator. Being a database administrator, it is a big responsibility on you to keep your database up to date and running. Database corruption leads to severe data loss and affects working of entire organization. In such critical situations, you must restore the data from current backup to fix the issue. But if backup is not available, Oracle database recovery becomes need of hour.
You must keep in mind that in case of emergency, you can open your corrupt database and access some data from it. It is possible using some special hidden parameters. This database corruption generally occurs due to database block corruption. Such hidden parameters enable you to easily ignore the damaged data blocks if the database is severely damaged. Some of the hidden parameters of the database are as given below:
_allow_resetlogs_corruption- This parameters is the only method to initialize 'db backed-up open without setting backup' on the tablespace. It makes your system unsupported.
_corrupted_rollback_segments- It is the only method to start up your database with damaged public rollback segments. You can use this undocumented parameter without concerning about invalidating support.
_allow_read_only_corruption- It enables the database to be accessed even if it is corrupt. You should use this option only while exporting as much information from your damaged Oracle database as possible before you re-create the database. You must not use the database in normal manner, which is opened in this manner.
_corrupt_blocks_on_stuck_recovery - You can use this database to start your damaged database. But, it is possibly not supported if you do it without blessing of Oracle. You should immediately expert database tables in such cases and rebuild it.
You should use the above hidden parameters to recover database only in case of emergency. The must be used by taking help from technical support of Oracle as improper use of these hidden parameters can cause further data loss.
In such cases, You need to repair Oracle database using third-party applications. They use most efficient scanning methods to ensure absolute recovery. Such database repair software are completely safe and easy to use.
Stellar Phoenix Oracle Recovery software repairs and restores damaged objects of Oracle database. The dbf recovery software supports recovery of tables, table spaces, views, schemas, roles, cluster tables, sequences, roles, indexes, and all other Oracle database objects. It salvages all the databases, created using Oracle 9i.
Source
You must keep in mind that in case of emergency, you can open your corrupt database and access some data from it. It is possible using some special hidden parameters. This database corruption generally occurs due to database block corruption. Such hidden parameters enable you to easily ignore the damaged data blocks if the database is severely damaged. Some of the hidden parameters of the database are as given below:
_allow_resetlogs_corruption- This parameters is the only method to initialize 'db backed-up open without setting backup' on the tablespace. It makes your system unsupported.
_corrupted_rollback_segments- It is the only method to start up your database with damaged public rollback segments. You can use this undocumented parameter without concerning about invalidating support.
_allow_read_only_corruption- It enables the database to be accessed even if it is corrupt. You should use this option only while exporting as much information from your damaged Oracle database as possible before you re-create the database. You must not use the database in normal manner, which is opened in this manner.
_corrupt_blocks_on_stuck_recovery - You can use this database to start your damaged database. But, it is possibly not supported if you do it without blessing of Oracle. You should immediately expert database tables in such cases and rebuild it.
You should use the above hidden parameters to recover database only in case of emergency. The must be used by taking help from technical support of Oracle as improper use of these hidden parameters can cause further data loss.
In such cases, You need to repair Oracle database using third-party applications. They use most efficient scanning methods to ensure absolute recovery. Such database repair software are completely safe and easy to use.
Stellar Phoenix Oracle Recovery software repairs and restores damaged objects of Oracle database. The dbf recovery software supports recovery of tables, table spaces, views, schemas, roles, cluster tables, sequences, roles, indexes, and all other Oracle database objects. It salvages all the databases, created using Oracle 9i.
Source
Thursday, December 30, 2010
With Advanced dbf recovery solution, recover Oracle database safely
The Oracle database, which is referred as Oracle RDBMS in technical circle and is popularly known as only 'Oracle' among most of the users. Oracle is one of the mostly used database applications in the world by financial organizations, software firms, business entrepreneurs and individuals. This vast database application facilitates many advanced features to deal with huge volume of data along with many advanced measures for preserving the data security and integrity. However, sometimes the Oracle database carrying all your business critical information becomes inaccessible and in such situations of database crisis, an Oracle database recovery utility can help you recover the corrupted or damaged Oracle.
In general, when you start an instance of Oracle application, it links to an Oracle database, which is known as the mounting database. With mounting, you can be able to perform the Select, Create, Modify and Delete operations on the mounted oracle. However, because of an unexpected system shut-down, file header corruption, virus infection etc, sometimes, the Oracle database fails to mount and the data in the database becomes completely inaccessible. Some of the common causes of database corruption or loss are listed as below:
Corruption to the Media Block
Malfunctioning of the operating system
Damage to the application server
Corruption to the file system of the database server system
If implemented with a RAID system, corruption/failure of the same
Formatting and Re-installation of operating system etc.
Under all the above cases of database loss or corruption, the database and the corresponding data is not permanently lost until they are being overwritten by some other data. Hence, with the help of any advanced utility to recover Oracle can be the key to repair and restore the seemingly lost data.
These dbf recovery utilities are designed with innovative methodologies to repair Oracle, even with harsh corruption and help you restore the tables, containers, triggers, schema, index, roles etc with their original format being intact. Moreover, these applications recover dbf without even modifying the structure of the original database and are absolutely risk-free in all their operations.
Stellar Phoenix Oracle Recovery is an advanced utility to repair Oracle database and restore various objects. The software has been designed to recover the databases created through Oracle 11g, 10g, 9i and is completely compatible with Windows Server 2003 and XP. The software incorporates many interesting features, such as recovery of selective database objects, previews of all the recoverable objects prior to original recovery etc. Moreover, the interactiveness of this Oracle database recovery application, which is an added plus for the users who does not have much technical knowledge to operate these kinds of recovery software.
Article Source: http://www.articlesbase.com/data-recovery-articles/with-advanced-dbf-recovery-solution-recover-oracle-database-safely-3871066.html
About the Author
My name is Mark Willium, I have done Ph.D in computer science and currently doing research on how to recover oracle database.
In general, when you start an instance of Oracle application, it links to an Oracle database, which is known as the mounting database. With mounting, you can be able to perform the Select, Create, Modify and Delete operations on the mounted oracle. However, because of an unexpected system shut-down, file header corruption, virus infection etc, sometimes, the Oracle database fails to mount and the data in the database becomes completely inaccessible. Some of the common causes of database corruption or loss are listed as below:
Corruption to the Media Block
Malfunctioning of the operating system
Damage to the application server
Corruption to the file system of the database server system
If implemented with a RAID system, corruption/failure of the same
Formatting and Re-installation of operating system etc.
Under all the above cases of database loss or corruption, the database and the corresponding data is not permanently lost until they are being overwritten by some other data. Hence, with the help of any advanced utility to recover Oracle can be the key to repair and restore the seemingly lost data.
These dbf recovery utilities are designed with innovative methodologies to repair Oracle, even with harsh corruption and help you restore the tables, containers, triggers, schema, index, roles etc with their original format being intact. Moreover, these applications recover dbf without even modifying the structure of the original database and are absolutely risk-free in all their operations.
Stellar Phoenix Oracle Recovery is an advanced utility to repair Oracle database and restore various objects. The software has been designed to recover the databases created through Oracle 11g, 10g, 9i and is completely compatible with Windows Server 2003 and XP. The software incorporates many interesting features, such as recovery of selective database objects, previews of all the recoverable objects prior to original recovery etc. Moreover, the interactiveness of this Oracle database recovery application, which is an added plus for the users who does not have much technical knowledge to operate these kinds of recovery software.
Article Source: http://www.articlesbase.com/data-recovery-articles/with-advanced-dbf-recovery-solution-recover-oracle-database-safely-3871066.html
About the Author
My name is Mark Willium, I have done Ph.D in computer science and currently doing research on how to recover oracle database.
Monday, December 27, 2010
Oracle Cannot Read Database Files Due to Corruption
The Oracle DBMS (Database Management System) stores data in a hierarchical format in all of its database components. Data is stored at four levels- Blocks, Extents, Tablespaces, and Segments. If any of these components is damaged, database becomes un-mountable and the database records become inconsistent. This behavior of Oracle database makes your valuable data inaccessible and causes serious data loss. In order to handle such situations, Oracle database recovery software are required.
Most commonly the Oracle database corruption starts at Tablespace level, which is the most initial level of the database. The reasons of database corruption could be anything from virus infection, improper system shutdown, application crash to operating system damage. You may encounter various error messages in such cases, while accessing the database. Such errors may be similar to the following one-
"ORA-00376: file xx cannot be read at this time"
You may encounter the above error every time you try to mount the Oracle database. A corrupt database cannot be mounted and thus it cannot be accessed. To recover Oracle database in such cases, you are required to identify the cause of this problem and then fix it using Oracle recovery solutions.
Cause
The most probable reason of this behavior of Oracle database (DBF file) is damage to the UNDO Tablespace. Corruption makes whole database unusable and inaccessible.
Resolution
Go through the below DBF recovery steps to work around the corruption problem-
Modify the value of the undo_management parameter as ‘MANUAL'. By default it is set to AUTO.
Drop the damaged Tablespace and create a new UNDO Tablespace.
In majority of situations, above steps fix the problem and repair Oracle database. But in case the above
solution fails, database becomes un-mountable. In such cases, try the following solutions-
Restore database from the most recent backup. However, you are recommended to restore the database only if you have a valid and updated backup. An incomplete backup may cause further data loss.
Use third-party Oracle recovery software to repair and restore the database. They perform Oracle database recovery in virtually every database corruption situation, regardless of the cause and extent of corruption.
Such DBF recovery applications are particularly designed to recover DBF files in an extremely safe and easy way with their read-only conduct and simple user interface. They recover Oracle database along with all of its components, such as tables, reports, forms, macros, data types, and more.
Stellar Phoenix Oracle Recovery is an effective Oracle database recovery solution to repair Oracle 9i database.
Article Source: http://www.articlesbase.com/data-recovery-articles/oracle-cannot-read-database-files-due-to-corruption-3921700.html
About the Author
My name is Mark Willium, I have done Ph.D in computer science and currently doing research on how to recover oracle database.
Most commonly the Oracle database corruption starts at Tablespace level, which is the most initial level of the database. The reasons of database corruption could be anything from virus infection, improper system shutdown, application crash to operating system damage. You may encounter various error messages in such cases, while accessing the database. Such errors may be similar to the following one-
"ORA-00376: file xx cannot be read at this time"
You may encounter the above error every time you try to mount the Oracle database. A corrupt database cannot be mounted and thus it cannot be accessed. To recover Oracle database in such cases, you are required to identify the cause of this problem and then fix it using Oracle recovery solutions.
Cause
The most probable reason of this behavior of Oracle database (DBF file) is damage to the UNDO Tablespace. Corruption makes whole database unusable and inaccessible.
Resolution
Go through the below DBF recovery steps to work around the corruption problem-
Modify the value of the undo_management parameter as ‘MANUAL'. By default it is set to AUTO.
Drop the damaged Tablespace and create a new UNDO Tablespace.
In majority of situations, above steps fix the problem and repair Oracle database. But in case the above
solution fails, database becomes un-mountable. In such cases, try the following solutions-
Restore database from the most recent backup. However, you are recommended to restore the database only if you have a valid and updated backup. An incomplete backup may cause further data loss.
Use third-party Oracle recovery software to repair and restore the database. They perform Oracle database recovery in virtually every database corruption situation, regardless of the cause and extent of corruption.
Such DBF recovery applications are particularly designed to recover DBF files in an extremely safe and easy way with their read-only conduct and simple user interface. They recover Oracle database along with all of its components, such as tables, reports, forms, macros, data types, and more.
Stellar Phoenix Oracle Recovery is an effective Oracle database recovery solution to repair Oracle 9i database.
Article Source: http://www.articlesbase.com/data-recovery-articles/oracle-cannot-read-database-files-due-to-corruption-3921700.html
About the Author
My name is Mark Willium, I have done Ph.D in computer science and currently doing research on how to recover oracle database.
Thursday, December 23, 2010
Recovering unmountable Oracle 9i database
The instance of an Oracle server is assembled using allocated memory (System Global Area) and running process (SMON, PMON, LGWR, DBWR). When you start the Server instance, it is allocated with the particular database, which is known as the mounting the Oracle database. This is the most primitive step of using the database and its related records. However, at times you are unable to access the Oracle instance. Such problems may occur due to corruption in Oracle database, which can happen because of various reasons such as media block corruption, damaged file system, damage in the Oracle 9i application server, etc. In such cases, you should try out each and every possible workaround to recover Oracle database including using latest database backup. If you are unable to fix the error, then you should use a third-party Oracle database recovery software to do the needful.
Consider a scenario wherein you are having Oracle 9i server on your Windows Server 2003 system. You try to mount the Oracle database using the following command:
oradim -new -sid %ORACLE_SID% -pfile c:xyz.ora
However, you are unable to mount the database instance. An erro message is displayed suggesting that the database cannot be mounted.
Cause:
There could be the following causes for the aforementioned problem:
You may not have the appropriate credentials to log into the database server and mount the database.
You are unable to open the parameter file.
The database has corrupted due to any of the reasons mentioned earlier in this article.
Resolution:
To resolve this problem, you need to repair Oracle database. To do this, you would have to ensure the following precautions:
You have the appropriate credentials to log into the database server.
The parameter file is at its mentioned location.
Try to find out if the backup of the database is clean and updated. If yes, then you should restore the database with its backup.
You should use the DBMS_REPAIR method to repair the block corruption in the Oracle database.
However, if you are still not able to mount the Oracle database then you should use a third-party DBF recovery software. Such read-only tools are able to recover DBF files without overwriting the existing database.
Stellar Phoenix Oracle Database Recovery is an Oracle database recovery software that repairs Oracle database created in Oracle 9i. It is capable of recovering various database components such as tables, views, cluster tables, schemas, sequences, etc. In addition, this oracle recovery software restores primary and foreign keys associated with the database tables. It is compatible with Windows Server 2003 and XP.
Resource: http://www.americanchronicle.com/articles/view/204324
Consider a scenario wherein you are having Oracle 9i server on your Windows Server 2003 system. You try to mount the Oracle database using the following command:
oradim -new -sid %ORACLE_SID% -pfile c:xyz.ora
However, you are unable to mount the database instance. An erro message is displayed suggesting that the database cannot be mounted.
Cause:
There could be the following causes for the aforementioned problem:
You may not have the appropriate credentials to log into the database server and mount the database.
You are unable to open the parameter file.
The database has corrupted due to any of the reasons mentioned earlier in this article.
Resolution:
To resolve this problem, you need to repair Oracle database. To do this, you would have to ensure the following precautions:
You have the appropriate credentials to log into the database server.
The parameter file is at its mentioned location.
Try to find out if the backup of the database is clean and updated. If yes, then you should restore the database with its backup.
You should use the DBMS_REPAIR method to repair the block corruption in the Oracle database.
However, if you are still not able to mount the Oracle database then you should use a third-party DBF recovery software. Such read-only tools are able to recover DBF files without overwriting the existing database.
Stellar Phoenix Oracle Database Recovery is an Oracle database recovery software that repairs Oracle database created in Oracle 9i. It is capable of recovering various database components such as tables, views, cluster tables, schemas, sequences, etc. In addition, this oracle recovery software restores primary and foreign keys associated with the database tables. It is compatible with Windows Server 2003 and XP.
Resource: http://www.americanchronicle.com/articles/view/204324
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