Data corruption refers to errors in computer data that occur during writing, reading, storage, transmission, or processing, which introduce unintended changes to the original data

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What types of corruption can DBCC CheckDB miss?

This question was prompted by this earlier post and my having a database filed away for future investigation that was restored following: BACKUP 'BrokenDatabase' detected an error on page (1:123456) ...
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DBCC CHECKDB unfixable corruption: Indexed view contains rows that were not produced by the view definition

TL;DR: I've got an unfixable corruption in an indexed view. Here the details: Running DBCC CHECKDB([DbName]) WITH EXTENDED_LOGICAL_CHECKS, DATA_PURITY, NO_INFOMSGS, ALL_ERRORMSGS on one of my ...
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How to find corrupt page in SQL Server 2008

I know I can execute a DBCC CHECKDB and get a status of my database. Questions How can I find if there is some corrupt data page into my database? If an error is throwndue to page corruption, where ...
10
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1answer
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PostgreSQL Database Data File Integrity Check

When running a PostgreSQL database system how do I know my database as a whole has 100% integrity? Basically how do I know if my data files and pages are all 100% good with no corruption? In the ...
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MySQL INNODB corruption after server crash during concurrent truncate command

My server crashed today I think due to a concurrent truncate table command on one of our INNODB tables. The server could be restarted, but after it starts up, everytime I try to issue an SQL command, ...
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Msg 2534 : DBCC CHECKDB allocation errors

We recently moved our intranet production database from an SQL Server 2008 to an SQL Server 2008 R2 brand new server. The backup Job have been failing since migrating, due to DBCC Errors (Check ...
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Attempt to fetch logical page (5:65424) in database 2 failed

I am getting following SqlException on calling a stored procedure - Attempt to fetch logical page (5:65424) in database 2 failed. It belongs to allocation unit 7349876362857938944 not to ...
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SQL Server 2005 database corruption. Advise

I have encounter some database corruptions in the past but I knew which object has hit the road. In this situation I run a DBCC CHECKDB against a problematic SQL Server 2005 database and I get the ...
6
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SQL Server Backup transaction error

Hi I am attempting to backup the transaction log file to setup mirroring in SQL Server I execute BACKUP LOG CUSTOMER TO DISK ='K:\JonDB\CUSTOMER.trn' WITH INIT GO And I receive Processed 6587361 ...
6
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Fixing corrupted Firebird database

I have a 200 GB Firebird database (created with Firebird 2.1.3, currently running 2.1.5), and it appears to be corrupted. When I try to do a backup I get: database file appears corrupt <> ...
6
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How to get online the database which has missing/corrupted FILESTREAM files?

I've corrupted the files related to FILESTREAM in a database. The .mdf and .ldf files are still intact, but when I try to get the database online, it complains, saying that the files related to ...
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SQL Server 2008 R2 (Suspect) mode - how to repair?

I have SQL Server 2008 R2 database in Suspect mode. I tried to fix it running this query: EXEC sp_resetstatus ‘yourDBname’; ALTER DATABASE yourDBname SET EMERGENCY DBCC checkdb(’yourDBname’) ALTER ...
5
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1answer
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Repairing corrupt SQL Server database backup?

I'm looking at a problem for someone who was backing up to a cloud-based service. Apparently the customer's server crashed while it was performing some maintenance on the cloud-based service's ...
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2answers
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How can I corrupt a table in SQL Server?

I have to write a program that detects corrupted tables and tries to repair them. For this I need to corrupt tables regularly. Is there anyway to corrupt tables manually?
4
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1answer
342 views

Alternative of DBCC CHECKDB

I am running DBCC CHECKDB on one of my database but its taking very very long time. I have some questions please help me. Is there any alternative of it that can check my database integrity? Should ...
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2answers
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Recover PostgreSQL database from WAL errors on startup?

I'm trying to set up an OpenStreetMap server on an Ubuntu 12.04 machine using the Ubuntu packages listed at switch2osm.org. I initially installed and set up everything using a Northeast US-only map ...
4
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MySQL relay log corrupted, how do I fix it? Tried but failed

A MySQL v5.1.61 relay got corrupted when the machine suddenly shut down. I tried to fix it but it didn't work. — How do I fix it? Did I do something wrong? As far as I've read, corrupted MySQL relay ...
4
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1answer
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Attaching a MDF with a missing LDF [duplicate]

Possible Duplicate: How do I attach a database in SQL Server? I was given an MDF for a database, no backups and not LDF that I was asked to attach the database to a SQL server. I get the ...
4
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RDS MYSQL instance rebooted and won't load INNODB table

So my production db in RDS apparently either crashed or was rebooted during a version update, and upon being restarted mysql couldn't load one of the innodb tables: as evidenced by the following error ...
3
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SQL Server Database is corrupted

Unfortunately hard disk of my system is damaged, now I recovered my database. But it cannot be attached again to SQL management studio 2005. The error is: myfile.mdf is not a primary database file. ...
3
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1answer
125 views

Reattaching MDF files recovered from RAID 5

We had been running a SQL Server 2005 server for many years at our company when just recently, we ran into some trouble. The server was configured with RAID 5 and had one hot spare disk in the array. ...
3
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2answers
313 views

Is there a Maintenance Plan that checks my database for corruption?

Is there any way to make a maintenance plan check all my databases on a single instance? Is the maintenance plan Check Database Integrity Task enough ?
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3answers
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Why does data get corrupted in “large” text files - Reasons to use database

I am just starting to learn about databases and using mysql. I read that databases are more reliable than having large ascii text files and that ascii text files are more prone to corruption as they ...
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2answers
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Trouble recovering data from corrupted PostgreSQL tables

I'm trying to recover my database after a recent corruption of the same. Now I have two tables that are really giving me trouble. When I do select count(*) One table returns: ERROR: could not ...
3
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1answer
379 views

An inconsistency in SQL Server 2008 R2

(could be) possible duplicate with An inconsistency was detected I have small table that returns from query UDA-SQL-0114 The cursor supplied to the operation "sqlOpenResult" is ...
3
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1answer
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InnoDB “corruption”

I use: 5.1.63-0ubuntu0.11.10.1 Apache/2.2.20 (Ubuntu) MySQL client version: 5.1.63 The system is continuously displaying the following error during reading data from a MySQL database: ...
3
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1answer
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mysql Wrong bytesec: 0-0-0 at linkstart: 0

I have several MySQL (MyISAM) tables that have been corrupted. Running CHECK TABLE mytable returns: > +-----------------+-------+----------+----------------------------------- | > ...
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1answer
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innodb_force_recovery when InnoDB corruption

When I start mysqld (in /etc/init.d), it failed with InnoDB: corruption in the InnoDB tablespace. What's the best innodb_force_recovery value to force mysqld to start? I have tried 4 and 6, but ...
3
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2answers
773 views

MySQL corruption even after full dump and re-import

We have a production issue where MySQL has started spitting InnoDB corrupt page errors and falling over. The error message seem to relate to indexes so I assume the data itself is ok and when I ...
3
votes
1answer
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MySQL 5.5 : (InnoDB) - Manually edited an .ibd file to test recovery, now entire MySQL installation is broken!

So I wanted to test MySQL recovery from Innodb corruption. file-per-table is enabled. I have a few test db's on the MySQL instance. I shutdown mysql. Manually edited/added random characters to an ...
3
votes
1answer
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SQL Server Rebuild/Reorganize Fragmented Indexes causes CRC error or consistency errors

In our test lab I've been experimenting with different jobs to keep our critical indexes from becoming too fragmented. I'm currently using the approach described here: sys.dm_db_index_physical_stats ...
3
votes
1answer
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How to run OPTIMIZE TABLE on a 3-node cluster?

I've my hands on a 3-node Percona XtraDB Cluster where, according to mysqlcheck, some tables are corrupted (some indexes contain the wrong number of entries): mydb.mytable Warning : InnoDB: Index ...
3
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1answer
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How to recover data around corrupted data in table? [closed]

I have a SQL Server database with some corrupted data unrepairable via DBCC CHECKDB in a table. I can get many of the rows before the corruption out - but how do I get the rows after the corruption ...
2
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1answer
44 views

Dealing with corruption: file-level backup vs. pg_basebackup

The wiki on corruption recommends immediately taking a file-level backup of your database by stopping the postmaster and using tar, but I was under the impression that using pg_basebackup was a better ...
2
votes
1answer
331 views

When do you remove entries from a write-ahead log (WAL)?

If I understand correctly, when a user updates a database record and commits the transaction the commit() call will block until the following steps are done: Database documents the change in the ...
2
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1answer
63 views

Troubleshoot corruption in SQL Server Database [closed]

I have been asked by my interviewer "How do you troubleshoot corrupted data in SQL in SQL Server 2012?"
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how to resolve mssqlsystemresource.mdf corruption?

Desperate for help, but fearing the worst here :( Something crashed SQLSERVER 2005 this afternoon approx 3pm. Since then I have been trying to get running again. Original log file messages told that ...
2
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2answers
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mysql 5.5 corrupt - missing temporary table

One of our mysql instances crashed and failed to start: 120422 10:04:13 InnoDB: Error: trying to open a table, but could not InnoDB: open the tablespace file './databasename/#sql-29f6_45.ibd'! ...
2
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2answers
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How do I recreate a deleted logfile on an Oracle database?

For my database assignment we were looking into "database corruption". I was asked to delete the second redo log file, which I have done with the command: rm log02a.rdo this was in the ...
2
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1answer
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How do I fix this corrupted page?

My database is in simple recovery mode. One page got corrupted and I only have backups created using simple backup. When I run this: DBCC PAGE ('myDB', 1, 952663, 3) I get: DBCC PAGE error: ...
2
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2answers
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An inconsistency was detected

Am running asp.net application.Am searching records.if i click the view button i got this error, an inconsistency was detected during an internal operation in database(database name) on ...
2
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1answer
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MySQL REPLACE appears to corrupt data

For reference, this issue was posted on StackOverflow.com before coming here. In MySQL I am running multiple REPLACE queries to update hardcoded URLs in a database. Queries look like this: UPDATE ...
2
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1answer
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CHECKDB found 2 allocation errors and 0 consistency errors not associated with any single object

Msg 8906, Level 16, State 1, Line 1 Page (1:99122) in database ID 9 is allocated in the SGAM (1:3) and PFS (1:97056), but was not allocated in any IAM. PFS flags 'MIXED_EXT ALLOCATED 0_PCT_FULL'. ...
2
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2answers
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Detecting and fixing database corruption on SQL Server mirrored database

I’m new to my current company and we have a System Administrator but no DBA. In the past I’ve taken care of DBA related issues at other companies. I’ve run into and corrected database corruption in ...
2
votes
2answers
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unable to bring database online from recovery pending

I am trying to bring a SQL Server database online and accessible that is in Recovery Pending state. The SQL Server service uses an Active directory account that is a domain administrator and a ...
2
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1answer
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sql server 2008 r2 DBCC checktable error

This morning my database went into suspect mode. I reverted back to last night's full backup to get it back online. I went through the error log and found the last command that appeared to cause the ...
2
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1answer
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SQL Server 2005 query erroring with message 7105, slot for LOB data type node does not exist

SQL Server 2005 sp3 Standard on 64-bit Windows Server 2008 inconsistently receiving an error that seems to indicate corruption select * from some_table where text_field like ‘%the fox did not go ...
2
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2answers
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FoxPro DBF Index Corruption

We are running a pretty popular application in Russia and other CIS countries through a pretty old accounting system called BEST. It's all built on FoxPro (not Visual Foxpro) DBF/CDX tables. It's open ...
2
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0answers
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Database Corruption - object in sys.parameters does not have a matching row in sys.objects

I'm using SQL Server 2008 R2 and I have a strange db corruption. I ran dbcc check db and the output is: Attribute (object_id=1096186) of row (object_id=1096186,parameter_id=1) in sys.parameters ...
2
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VSS Writer : RESTORE VERIFYONLY FROM VIRTUAL_DEVICE breaks log shipping

Log shipping has been working for a very long time, but now and then it breaks. I found it sometimes breaks (causes the transaction log to become corrupt and I get the message : "media family on ...