DBCC CHECKDB: How to Detect and Handle SQL Server Database Corruption
Originally published at SQL & Cloud Lab . Database corruption is rare, but when it happens, the difference between a five-minute fix and a lost weekend is how early you find it. SQL Server will happily keep running on a damaged database until a query touches the bad page. DBCC CHECKDB is the tool that finds damage before your users do, and knowing how to run it and what to do with the results is…
Database corruption can be a rare but devastating issue. SQL Server detects it when a read operation fails and raises errors 823, 824, or 825. These errors should trigger alerts to quickly identify the issue. To check database consistency, use the DBCC CHECKDB command. For large databases, a physical-only scan may be faster and still catch most storage problems.
If corruption occurs, first check the summary output for repair level recommendations. Common fixes include rebuilding nonclustered indexes or restoring from backup, depending on the extent of the damage. The last resort is repair_allow_data_loss, which should only be used when no backups are available. To prevent recurrence, monitor for corruption errors and address hardware or driver issues promptly.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
