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Reducing DBCC Impact

 

DBCC Checks and Terabyte-Scale Databases

 

This document covers some of the options available to reduce the impact of running DBCC checks on VLDBs. ... Source : Stuart Ozer - Technical Note - SQLCAT.com

 

 

Running DBCC on a VLDB

 

In this Blog post, Paul Randal discusses the options for running DBCC CHECKDB on VLDB's  ... Source : Paul Randal - SQL Server Storage Engine - Blog Post

 

 

How long will CHECKDB take to run?

 

There are many factors that determine how long a DBCC check is likely to take on a particular database. In this blog post, Paul covers the top 10 ... Source : Paul Randal - SQLskills.com - Blog Post

 

 

Sparse Files; Under the Covers

 

Sparse files enable features such as online DBCC checks and Database Snapshots fast and efficient, but there is a fair degree of mystery surrounding how they actually work. This post addresses that very topic ... Source : Sarah Henwood & Bob Dorr - CSS SQL Server Engineers - Blog Post

 

 

Running DBCC on a user defined snapshot

 

DBCC uses a snapshot to reduce the performance impact on users whilst running. The problem with this is that the snapshot is created on the same disk(s) as the database, and may lead to failure if all the disk space is consumed by the snapshot during the dbcc check. In this post, Kalen talks about running the DBCC check on a user defined snapshot, which allows you to define the disk location for the snapshot, and therefore have more control of disk space usage during the DBCC check ... Source : Kalen Delaney - SQLblog.com - Blog Post 

 

Database Checksums - Is CHECKDB still necessary?

 

The database checksum feature introduced in SQL Server 2005 goes a long way to detecting physical corruption as early as possible, however, DBCC CHECKDB (and related commands) are still very much needed, as Bob Dorr points out in this post ... Source : Bob Dorr - CSS SQL Server Engineers - Blog Post

 

 


Preventing Corruption

 

Error 825, a.k.a Impending Doom

 

A common (and recommended) practice is to setup SQL Server alerts for all high severity errors, typically level 16 . Amongst other things, this captures errors 823 and 824, both of which relate to I/O errors. Error 825 is raised when an I/O error occurs, but subsequent reads succeed. The problem here is that this error is raised as a level 10, and therefore not captured by a lot of monitoring systems. As Paul points out, creating an alert for this particular error is crucial in receiving an early warning of possible future I/O problems, or as he puts in, Impending Doom ... Source : Paul Randal - SQLSkills.com - Blog Post

 

 

DBCC CHECKDB: Last Success and Completion Status

 

Do you use SQL Agent Jobs to run DBCC CHECKDB? If the job completes without error, do you assume that the check was successful? In this blog post, Paul highlights the danger of this assumption, and tells us how we can find out the last successful CHECKDB operation for a given database ... Source : Paul S. Randal - sqlSkills.com - Blog Post

 


Repairing Corruption

 

How to create a corrupt database

 

In order to test your processes when you encounter database corruption, you need to have a known corrupt database to test against. This article shows you how to produce a corrupt database for testing purposes ... Source : Tony Rogerson - Blog Post

 

 

Can DBCC CHECKDB repair everything?

 

In this Blog post, Paul Randal discusses the ramifations and possible outcomes from using CHECKDB to repair a damaged database... Source : Paul Randal - SQLskills.com - Blog Post

 

 

Tips and tricks for interpreting CHECKDB output

 

Having trouble understanding the output of DBCC ? Paul wrote it, so he should know :-) In this post, he explains the output, and gives some insiders tricks to understanding it better  ... Source : Paul Randal - SQLskills.com - Blog Post

 

 

Corruption Recovery Techniques: Last Resorts

 

Despite the existence on recovery options such as REPAIR_ALLOW_DATA_LOSS and REBUILD_LOG, they should not be used until a series of other (less destructive) options are explored. As Paul points out in this post, the consequences of using them can be catastrophic ... Source : Paul Randal - SQLSkills.com - Blog Post

 

 

REPAIR_ALLOW_DATA_LOSS; What CHECKDB will delete

 

Before running the REPAIR_ALLOW_DATA_LOSS command, an attempt should be made to identify the extent of loss. In this post, Paul takes us through the use of the DBCC PAGE command to do exactly that ... Source : Paul Randal - SQLSkills.com - Blog Post

 

 

What is (and what causes) corruption?

 

Depending on who you talk to, "Corruption" can mean anything from orphaned records due to an application bug through to a trashed hard drive. In this post, Paul categorizes corruptions, and dispels a few myths along the way ... Source : Paul Randal - SQLSkills.com - Blog Post

 

 



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