SQL: TABLE CORRUPTED

MS-SQLSQL

Symptoms: SQL cannot select, insert or update data from table.

Impact: Critical

Data cannot be selected from or inserted into one or more tables causing loss of data to the application.

Expected behavior :

This alert indicates unexpected behavior and needs to be investigated.

Possible causes

IO subsystem level problem  Priority: Critical
Failure of some hardware component handling data traffic or storage is the most likely reason for this error. The elements involved are:

  • Drives
  • Controllers
  • Incorrect Drivers

Recommended action :
Firstly, identify the faulty component and repair/replace it. Next, perform database integrity checks:

    • Run SQL DBCC checkdb
    • Run Disk-Check utility

In case of damage or loss of integrity, locate the most recent database backup and restore the table with the assistance of DB Admin.

Background

Corruption of one or more tables will strongly affect functionality and availability. Building levels of redundancy (clustered servers, cloud-based infrastructures, etc.) will minimize impact, but the only sure way to guarantee full recovery in the shortest possible time is to maintain comprehensive up-to-date backup routines.

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