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Table error: Extra or invalid key.

Microsoft.SQLServer.2000.Table_error__Extra_or_invalid_key (Rule)

Knowledge Base article:

Causes

Every data row in a table (heap or clustered index) must have exactly one matching index row in every non-clustered index over that table. This error means that a non-clustered index has an index row that does not match any data row.

There will be an accompanying 8956 message that identifies the index row and its keys, and the data row that the index row thinks it matches. There may also be accompanying 8951 and 8955 errors.

Resolutions

HARDWARE FAILURE

Run hardware diagnostics and correct any problems. Also examine the Microsoft® Windows NT® system and application logs and the SQL Server™ error log to see if the error occurred as the result of hardware failure. Fix any hardware related problems.

If you have persistent data corruption problems, try to swap out different hardware components to isolate the problem. Check to ensure that your system does not have write caching enabled on the disk controller. If you suspect this to be the problem, contact your hardware vendor.

Finally, you might find it beneficial to switch to a completely new hardware system, including reformatting the disk drives and reinstalling the operating system.

RESTORE FROM BACKUP

If the problem is not hardware related and a known clean backup is available, restore the database from the backup.

DBCC CHECKDB

If no clean backup is available, execute DBCC CHECKDB without a repair clause to determine the extent of the corruption. DBCC CHECKDB will recommend a repair clause to use. Then, execute DBCC CHECKDB with the appropriate repair clause to repair the corruption.

CAUTION: If you are unsure what effect DBCC CHECKDB with a repair clause has on your data, contact your primary support provider before executing this statement.

CAUTION: Repair will rebuild the index. If running DBCC CHECKDB with one of the repair clauses does not correct the problem, contact your primary support provider.

Element properties:

TargetMicrosoft.SQLServer.2000.DBEngine
CategoryEventCollection
EnabledTrue
Event Source$Target/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/ServiceName$
Alert GenerateTrue
Alert SeverityWarning
Alert PriorityNormal
RemotableTrue
Alert Message
Table error: Extra or invalid key.
{0}
Event LogApplication
CommentMom2005ID='{D23305FF-D62F-4D67-A7D5-E7C8C961D3CB}'

Member Modules:

ID Module Type TypeId RunAs 
EventDS DataSource Microsoft.Windows.EventProvider Default
GenerateAlert WriteAction System.Health.GenerateAlert Default

Source Code:

<Rule ID="Microsoft.SQLServer.2000.Table_error__Extra_or_invalid_key" Target="SQL2000Core!Microsoft.SQLServer.2000.DBEngine" Enabled="true" Comment="Mom2005ID='{D23305FF-D62F-4D67-A7D5-E7C8C961D3CB}'" Remotable="true">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="EventDS" TypeID="Windows!Microsoft.Windows.EventProvider">

      <ComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>

      <LogName>Application</LogName>

      <Expression>

        <And>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>PublisherName</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>$Target/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/ServiceName$</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <RegExExpression>

              <ValueExpression>

                <XPathQuery>EventDisplayNumber</XPathQuery>

              </ValueExpression>

              <Operator>MatchesMOM2005RegularExpression</Operator>

              <Pattern>^(17052|17055)$</Pattern>

            </RegExExpression>

          </Expression>

          <Expression>

            <RegExExpression>

              <ValueExpression>

                <XPathQuery>EventDescription</XPathQuery>

              </ValueExpression>

              <Operator>MatchesMOM2005BooleanRegularExpression</Operator>

              <Pattern>((^.*8952 and (not ^.*\n.*8952)) or (^.*8952.*\n.*8952)) AND (NOT ^.*[0-9]+.*8952) AND (NOT ^.*8952[0-9]+)</Pattern>

            </RegExExpression>

          </Expression>

        </And>

      </Expression>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="GenerateAlert" TypeID="SystemHealth!System.Health.GenerateAlert">

      <Priority>1</Priority>

      <Severity>1</Severity>

      <AlertOwner>$Data/PublisherName$</AlertOwner>

      <AlertMessageId>$MPElement[Name="Microsoft.SQLServer.2000.Table_error__Extra_or_invalid_key.AlertMessage"]$</AlertMessageId>

      <AlertParameters>

        <AlertParameter1>$Data/EventDescription$</AlertParameter1>

      </AlertParameters>

      <Suppression>

        <SuppressionValue/>

      </Suppression>

    </WriteAction>

  </WriteActions>

</Rule>