Unique tables are used by the database client drivers, like Microsoft Access driver for SQL Server, to build updateable queries. For a given SELECT statement, the unique table identifies the table whose row values appear at most once in the result set. When reselecting a row from a result set, the values from the key columns of the unique table are enough to identify the row. This error is raised when the server is unable to compute the unique table.
Unique tables are used by the database client drivers, like Microsoft Access driver for SQL Server, to build updateable queries. For a given SELECT statement, the unique table identifies the table whose row values appear at most once in the result set. When reselecting a row from a result set, the values from the key columns of the unique table are enough to identify the row. This error is raised when the server is unable to compute the unique table.
This error may be raised when the SELECT query has a UNION, GROUP BY, ROLL UP or other aggregates. Unique tables are not defined for these cases.
Re-write the query avoiding the constructs which prevent unique table computation. In most of the error scenarios, updateable result set is not implementable.
Name | Description | Default Value |
Enabled | Enables or disables the workflow. | Yes |
Interval (seconds) | The recurring interval of time in seconds in which to run the workflow. | 300 |
Priority | Defines Alert Priority. | 1 |
Severity | Defines Alert Severity. | 2 |
Synchronization Time | The synchronization time specified by using a 24-hour format. May be omitted. |
|
Timeout (seconds) | Specifies the time the workflow is allowed to run before being closed and marked as failed. | 200 |
Timeout for query execution (seconds) | The workflow will fail and register an event, if the query execution takes longer than the specified period. | 60 |
Timeout for database connection (seconds) | The workflow will fail and register an event, if it cannot access the database during the specified period. | 15 |
Target | Microsoft.SQLServer.Linux.DBEngine | ||
Category | EventCollection | ||
Enabled | True | ||
Alert Generate | True | ||
Alert Severity | Error | ||
Alert Priority | Normal | ||
Remotable | True | ||
Alert Message |
| ||
Comment | Mom2017ID='{E8827C4D-1683-4BC1-915A-32FB2D21441B}';MOM2017GroupID={467ECC75-C5DA-42BD-955C-A73BBB51AF74} |
ID | Module Type | TypeId | RunAs |
---|---|---|---|
_F6DA1507_12AF_11D3_AB21_00A0C98620CE_ | DataSource | Microsoft.SQLServer.Linux.DataSource.EventCollectionFiltered | Default |
GenerateAlert | WriteAction | System.Health.GenerateAlert | Default |
<Rule ID="Microsoft.SQLServer.Linux.EventRule.DBEngine.Unique_table_computation_failed_1_5_Rule" Target="SqlDiscL!Microsoft.SQLServer.Linux.DBEngine" Enabled="true" ConfirmDelivery="true" Remotable="true" Comment="Mom2017ID='{E8827C4D-1683-4BC1-915A-32FB2D21441B}';MOM2017GroupID={467ECC75-C5DA-42BD-955C-A73BBB51AF74}">
<Category>EventCollection</Category>
<DataSources>
<DataSource ID="_F6DA1507_12AF_11D3_AB21_00A0C98620CE_" Comment="{F6DA1507-12AF-11D3-AB21-00A0C98620CE}" TypeID="Microsoft.SQLServer.Linux.DataSource.EventCollectionFiltered">
<MachineName>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/MachineName$</MachineName>
<NetbiosComputerName>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/NetbiosComputerName$</NetbiosComputerName>
<InstanceName>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/InstanceName$</InstanceName>
<ConnectionString>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/ConnectionString$</ConnectionString>
<InstanceVersion>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/Version$</InstanceVersion>
<InstanceEdition>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/Edition$</InstanceEdition>
<SqlExecTimeoutSeconds>60</SqlExecTimeoutSeconds>
<SqlTimeoutSeconds>15</SqlTimeoutSeconds>
<TimeoutSeconds>200</TimeoutSeconds>
<IntervalSeconds>300</IntervalSeconds>
<SyncTime/>
<EventDisplayNumber>16959</EventDisplayNumber>
</DataSource>
</DataSources>
<WriteActions>
<WriteAction ID="GenerateAlert" TypeID="Health!System.Health.GenerateAlert">
<Priority>1</Priority>
<Severity>2</Severity>
<AlertMessageId>$MPElement[Name="Microsoft.SQLServer.Linux.EventRule.DBEngine.Unique_table_computation_failed_1_5_Rule.AlertMessage"]$</AlertMessageId>
<AlertParameters>
<AlertParameter1>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/MachineName$</AlertParameter1>
<AlertParameter2>$Target/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/InstanceName$</AlertParameter2>
<AlertParameter3>Event ID: $Data/Property[@Name='EventID']$. $Data/Property[@Name='Message']$</AlertParameter3>
</AlertParameters>
<Suppression>
<SuppressionValue/>
</Suppression>
</WriteAction>
</WriteActions>
</Rule>