Posted on Thursday, January 27, 2011 at 3:36 AM
A transaction log is an important component of database which is often ignored or overlooked as it is not regularly maintained or used by the database administrators or users. It keeps track of all the changes made to the database and maintains a separate data file to store the actual data. Transaction log backup and the corresponding data file backup can be used to perform database recovery in case of a corruption and restore the database to its original state. But the transaction log may get corrupt due to several reasons, such as installing wrong drivers, virus attack, hard drive failure, system table corruption etc. In such situations, the transaction log may become inaccessible and thus, you may not be able to restore your database. To overcome this problem, you need to go for SQL database recovery through a reliable third party utility.
While trying to access a corrupt transaction log, you may see the following error in ERRORLOG or Windows Application Event Log:...
Posted on Monday, January 24, 2011 at 4:30 AM
The metadata structure of SQL Server database comprises of numerous Index pages, which further consist of data pages. The data pages at each level of Index page are linked in a doubly-linked list. Inaccessibility of data stored in the data pages primarily occurs due to breaking of linked list (metadata structure corruption). Additionally, it also results in unmountability of the database. Few main reasons for metadata structure damage are improper system shutdown, virus hits, or physical damage. An easy solution to overcome the metadata structure corruption situation, you will need to restore the data from an updated database backup. However, with case studies proving that database users tend to forget to create an updated database backup, it is always handy to take help of third-party sql database repair applications.
Picture a scenario, where you receive the below error message while you attempt to mount your SQL Server database:...
Posted on Thursday, December 23, 2010 at 4:42 AM
In MS SQL Server, the CHECKTABLE command is used to check the integrity of the database tables. To do this, it uses several parameters to perform different types of checks. However, if the table is corrupt then this command may not work and exit abruptly. Such database corruption may cause because of several issues including virus infections, hardware malfunctioning, etc. These cases can well be solved using appropriate corrective measures failing which you should use a third-party MS SQL repair software to do the needful.
Consider a scenario in which you are running the CHECKTABLE tool on a database in MS SQL Server 2000. However, the tool fails to execute and exits abruptly showing the following error message.
"CHECKTABLE terminated. A failure was detected while collecting facts. Possibly tempdb out of space or a system table is inconsistent. Check previous errors."
Cause:...
Posted on Thursday, September 16, 2010 at 5:17 AM
The DBCC CHECKDB utility is a useful tool in MS SQL Server databases that enables you to find and repair any kind of issues in the MDF files. There are several kinds of repair clauses that help in repairing different types of problems. However, at times, some of the problems are so rigid that DBCC CHECKDB is unable to repair them. In such cases, you should opt for other MDF file recovery techniques failing which you are advised to use a third-party
SQL recovery software to recover MDF file.
Let us assume a situation in which you are running DBCC CHECKDB in an MS SQL Server 2000 database and getting the following error message:
"Table error: Object ID O_ID1, index ID I_ID1 cross-object chain linkage. Page P_ID1 points to P_ID2 in object ID O_ID2, index ID I_ID2."
Cause:
The primary cause of this problem is that the P_ID1 page is referring to the P_ID2 page in a different page.
Resolution:...
Posted on Wednesday, September 01, 2010 at 3:20 AM
Are you getting some table errors while working on MS SQL Server 2000 database? At times, these errors appear because of database corruption, which can be caused due to various reasons including header corruption in the MDF (Master Database File) file, virus infections, etc. Such corruption issues can make the SQL database vulnerable and may make it inaccessible. In such cases, you should use a third-party SQL database recovery software if you are unable to recover SQL database using any workaround.
Let us have a look at a practical situation in which you are getting the following error message while working on a database table in MS SQL Server 2000:
“Table error: Cross object linkage: Page P_ID1, slot S_ID1, in object ID O_ID1, index ID I_ID1 refers to page P_ID2, slot S_ID2, in object ID O_ID2, index ID I_ID2.”
Cause:
The root cause of this problem is that the P_ID1 page points to a P_ID2 in a different object.
Resolution:...
Posted on Wednesday, July 07, 2010 at 5:34 AM
The system catalogs in SQL Server databases are used to store various types of information such as number and names of tables and views in the database among many others. This information is collectively referred as metadata. However, sometimes this metadata may get corrupt due to various reasons such as virus infections, hardware issues, power outages, etc. In such cases, you should use the in-place methods to rectify the problem. However, if you are not able to recover SQL database, then you should use a third-party
Repair SQL database software to do the needful.
Consider a scenario wherein you encounter the following error message while using the DBCC CHECKNAME tool on an SQL Server 2008 database:
"Database 'DBNAME': consistency errors in system catalogs prevent further DBCC CHECKNAME processing."
Cause:
There could be the following causes for this error. They are:
The system base tables are storing the metadata for all the objects in the database...
Posted on Wednesday, June 30, 2010 at 4:59 AM
MS SQL Server 2000 is used to provide enterprise solution in many reputed organizations. The primary reasons behind this are that it is simple to use, scalable for huge databases, provides strong support for demanding situations, etc. However, having said that, the database tables may sometimes become corrupt thereby disabling you to use it properly. Such issues can occur due to virus infections, power outages, damaged hardware components, etc. You should inquire for the cause of the corruption and try to recover SQL database. If you are not able to resolve the issue, then you should use a third-party SQL database recovery software to perform
SQL server recovery.
Consider a scenario wherein you encounter the following error message while working on an SQL Server 2000 database.
"
Table error: Object ID O_ID, Index ID I_ID. Duplicate keys on page P_ID1 slot SLOT1 and page P_ID2 slot SLOT2."
Cause:...
Posted on Sunday, June 13, 2010 at 11:28 PM
Like other databases and files, Microsoft SQL Server database may also come across various corruption issues. The corruption can take place due to various reasons, including the internal database or SQL Server application issues and system related problems. One major system related problem, which can cause MDF (Master Database File) corruption, is I/O logical check failure. In such situations, the database becomes totally inaccessible and you come across severe data loss situations. In order to get your mission critical data back, you need to repair and restore the corrupt database using
SQL database recovery solutions.
The I/O logical check failure can be indicated by various error messages, which includes the following one:
“Error 823
I/O error <error> detected during <operation> at offset <offset> in file '<file>'”...
Posted on Wednesday, June 09, 2010 at 5:00 AM
In Microsoft SQL Server, if any transaction violates the integrity constraints during execution, database inconsistency occurs. The transaction leaves your MS SQL Server database in illegal state and it gets aborted with an error. Database inconsistency leaves your MDF (Master Database File) in an unusable and inaccessible state, which can lead to serious data loss. In such cases, a valid and updated backup come for your rescue. You can easily restore all your valuable data from current backup and prevent needs of
SQL recovery using third-party applications.
However, in case you are unable to restore data from the backup or backup is incomplete, you can check the database errors and fix them using inbuilt utility of Microsoft SQL Server, called CHECKDB. It offers you an option to repair the database errors. Database inconsistency may also occur due to system level errors, like file system and hardware. You are highly recommended to fix these errors before repairing the database, else you may face the same problem again after some time...
Posted on Monday, June 07, 2010 at 4:46 AM
In SQL Server 2008, the Auditing feature has been introduced that allow you to track user and system activity for the enterprise customers. This feature provides the option to detect any unauthorized access attempts, if any, to the SQL Server database. Also, it facilitates a rich and powerful tracking capability to recognize any sensitive configuration changes to the database by the administrators. However, at times the auditing process can fail thereby making the database get corrupt. You should use appropriate corrective measures to rectify the problem. If you are not able to address the situation, then you should use a third-party
SQL recovery tool software to recover SQL database.
Consider a scenario wherein you encounter the following error message while auditing a database table in SQL Server 2008.
“Table error: alloc unit ID A_ID, page P_ID. The test (TEST) failed. The values are VAL1 and VAL2.”
Cause:...
Posted on Friday, June 04, 2010 at 5:11 AM
Microsoft SQL Server includes an inbuilt utility, called DBCC CHECKDB, to check the consistency and integrity of MDF (Master Database File). However, sometimes the DBCC CHECKDB process does not complete successfully and can not fix the associated issues. Database inconsistency can make the SQL Server database inaccessible and lead to severe data loss situations. In such cases, you need to
recover SQL database, in order to extract data from it.
When you execute DBCC CHECKDB on an SQL database, an error message similar to the following one, appears in ERRORLOG of Microsoft SQL Server-
"2010-03-31 22:07:06.34 spid53 DBCC CHECKDB (mydb) executed by MYDOMAIN\theuser found 15 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 0 seconds. Internal database snapshot has split point LSN = 00000026:0000089d:0001 and first LSN = 00000026:0000089c:0001. This is an informational message only. No user action is required."...
Posted on Tuesday, June 01, 2010 at 5:25 AM
Are you getting 'Error 823' while accessing an SQL Server database or modifying the database? Are you getting various database inconsistency errors while querying SQL Server database? Well, the problem may take place if your SQL Server database is either inconsistent or damaged. In such critical situations, you must have a complete backup to restore data from it. However, the situations may become worse if there is no current backup in place. At this point of time, you have to opt for
SQL recovery tools to get your valuable data recovered.
You may come across the below errors in Windows Application Event Log or MS SQL Server ERRORLOG while performing any operation on MDF (Master Database File) of SQL Server:
"2010-03-06 22:41:19.55 spid58 Error: 823, Severity: 24, State: 2...
Posted on Friday, May 28, 2010 at 4:25 AM
Microsoft SQL Server RDBMS (Relational Database Management System) enables you to take your database online and offline as per your requirements. You can set your database either online or offline easily using the 'Alter Database' command. If MDF (Master Database File) of your SQL Server is online, all the connected users can access it, modify it, perform other operations, depending upon the privileges assigned to them. However, in some situations, you may face critical database corruption problems, while trying to set an MS SQL Server database online. This behavior leads to significant data loss situations and needs
SQL recovery to be sorted out.
As a practical example of the above problem, you may come across the underwritten error messages when you try to set your MS SQL Server database online using 'ALTER DATABASE mydb SET online' command:
Msg 5171, Level 16, State 1, Line 1
E:\Data\mydb_log.ldf is not a primary database file...
Posted on Wednesday, May 26, 2010 at 10:09 PM
When you use the DML (Data Manipulation Language) commands to update the database, the rows sometimes get in an intermediate state. It is called the antimatter state that enables concurrent DELETE statements to leave a pointer for the index builder transaction so that deleted rows are not inserted again. Ideally, these rows should be deleted at the end of the operation. However, sometimes it does not happen that invariably results in database corruption. To resolve this situation, you should use appropriate corrective methods. However, if you are unable to do so then you should use a third-party
MDF repair software to address the issue.
Consider a scenario wherein you are working on a table in SQL Server 2008. You get the following error message while performing some modifications on the database table:
“Table error: Object ID O_ID, index ID I_ID, partition ID PN_ID, alloc unit ID A_ID (type TYPE), page PG_ID, row R_ID. DBCC detected incomplete cleanup from an online index build operation. (Antimatter column value is VALUE.)”...
Posted on Monday, May 24, 2010 at 1:32 AM
Microsoft SQL Server stores all your valuable data in MDF (Master Database File) in the form of tables. The data is organized using database index, which makes it easy to locate and access stored data. Sometimes, the database grows unexpectedly and performance of the database gets decreased dramatically. To control the database growth, you can use native options of Microsoft SQL Server, such as 'Filegroup'. If you do not take any such actions, the database may crash and get damaged. This behavior causes serious data loss and requires
SQL database recovery to be sorted out, if there is no backup in place.
Microsoft SQL Server offers various methods to help supporting the database growth. From the database planning point of view, one of the most important topic that must be covered is the 'Filegroup'. It can be considered as a logical data storage unit to hold the SQL Server database objects, which maps to multiple files or file system file...
Posted on Friday, May 21, 2010 at 5:10 AM
In Microsoft SQL Server, MSDTC (Microsoft Distributed Transaction Coordinator) allows the client applications to include various data sources in a single transaction. These transaction coordinates committing distributed transactions throughout all servers, which are listed in transaction. MSDTC is a transaction manager that is actually a Windows process. Under some situations, this transaction manager may cause various critical problems in SQL Server, if it is improperly configured, which cause database corruption. In such cases, you need to go for
SQL data recovery solutions to get your mission-critical data back.
Microsoft supports running the MSDTC services only on the cluster nodes as clustered resource. You are not recommended to run the MSDTC in a stand-alone mode on cluster. It is not even supported in most of the cases. Using the MSDTC as non-clustered resource on Microsoft Windows cluster can cause several problems. Such configuration is quite problematic as the transaction can not be orphaned and you might come across database corruption in any cluster failover takes place...
Posted on Wednesday, May 19, 2010 at 4:21 AM
In Microsoft SQL Server 2008, you can configure the database mirroring between two database. It improves database reliability and prevent data loss situations, if one database gets damaged due to any reason. In case of failure, you can restore the copy of your database from mirror database. However, if you unintentionally remove the transaction log files on SQL Server database, database mirroring session is broken by principle server. After this behavior, you can not restore the data from mirror server if principle server fails. It causes database corruption and require SQL Database Recovery to be fixed, if backup is not available.
As a practical instance of this problem, consider the underwritten scenario:
In Microsoft SQL Server 2008 SP1 (Service Pack 1) or Microsoft SQL Server 2008, you configure mirroring between two databases.
You run ALTER DATABASE command along with REMOVE FILE clause for removing the transaction log files of SQL Server database on principal server...
Posted on Tuesday, May 18, 2010 at 2:45 AM
SQL Server 2005 provides various options to control the growing size of the database. One such option is to create a filegroup. TA filegroup is a logical storage unit which is used to contain the database objects that reference to a file system file or multiple files. In a filegroup, additional disk drives are allocated to support the estimated growth of the database. Then, the additional files are shifted to these filegroups to spread the I/O over additional disks. Having said that, these filegroups-supported databases can get corrupt due to various reasons. In such cases, you should consider taking appropriate corrective measures to resolve the issue. However, if the measures are not sufficient then you should use a third-party
repair mssql database software to repair the corrupted database.
Consider a scenario wherein you have received the following error message when you open the SQL Server 2005 database:...
