Analyzing Database Lock Timeout Trace Telemetry
INTRODUCED IN: Business Central 2020 release wave 1, version 16.0
Note
Azure Active Directory is now Microsoft Entra ID. Learn more
Database lock timeout telemetry gathers information about database locks that have timed out. The telemetry data allows you to troubleshoot what caused these locks.
In the client, when a lock has timed out, the user is presented with a message, similar to the following message:
The operation could not complete because a record in the [table name] table was locked by another user. Please retry the activity.
Two types of trace events are emitted to Application Insights:
The first is a Database lock timed out event. This event includes general information about the lock request. This event includes information like the AL object and code that is impacted by the lock, the extension involved, and more.
The Database lock timed out event then triggers one or more Database lock snapshot events. Database lock snapshot events provide details about SQL sessions that hold database locks at the time of lock timeout, including the session that caused the lock timeout. These events include specific details about the SQL lock request on the database, like the type, status, mode, and the table.
Note
In later versions of Business Central on-premises, the Business Central Server includes the EnableLockTimeoutMonitoring setting. Use this setting to turn database lock timeout telemetry on or off. By default, it is off. For more information, see Configuring Business Central Server.
Database lock timed out
Occurs when a database lock has timed out for a session.
General dimensions
| Dimension | Description or value |
|---|---|
| message | Database lock timed out |
| severityLevel | 3 |
Custom dimensions
| Dimension | Description or value |
|---|---|
| aadTenantId | Specifies the Microsoft Entra tenant ID used for Microsoft Entra authentication. For on-premises, if you aren't using Microsoft Entra authentication, this value is common. |
| alExecutingMethodScope | Specifies the AL action that is running the transaction that caused the lock. |
| alObjectId | Specifies the ID of the running AL object that requested the lock. |
| alObjectName | Specifies the name of the running AL object that requested the lock. not shown |
| alObjectType | Specifies the type of the running AL object that requested the lock, such as a page or report. |
| alStackTrace | The stack trace in AL. |
| clientType | Specifies the type of client that executed the SQL Statement, such as Background or Web. For a list of the client types, see ClientType Option Type. |
| companyName | Specifies the display name of the Business Central company. |
| component | Dynamics 365 Business Central Server |
| componentVersion | Specifies the version number of the component that emits telemetry (see the component dimension.) |
| deprecatedKeys | Specifies a comma-separated list of all the keys that have been deprecated. The keys in this list are still supported but will eventually be removed in the next major release. We recommend that update any queries that use these keys to use the new key name. |
| eventId | RT0012 |
| environmentName | Specifies the name of the tenant environment. See Managing Environments. |
| environmentType | Specifies the environment type for the tenant, such as Production, Sandbox, Trial. See Environment Types |
| extensionId | Specifies the AppID of the extension that was involved in the lock. |
| extensionName | Specifies the name of the extension that was involved in the lock. |
| extensionVersion | Specifies the version of that was involved in the lock. |
| sessionId | Specifies the ID of the session that requested the lock. |
| snapshotId | Specifies the ID of the database snapshot. This ID is used to identify associated Database lock snapshot trace events. |
| sqlServerSessionId | Specifies the ID of the SQL server session that requested the lock. |
| telemetrySchemaVersion | Specifies the version of the Business Central telemetry schema. |
Sample KQL code
This KQL code can help you get started troubleshooting lock timeouts.
Note
Reminder, as stated in previous section that if these events can't be found on on-premise installations it is because the EnableLockTimeoutMonitoring setting is inactivated.
traces
| where timestamp > ago(2d) // adjust to your needs
| where customDimensions has 'RT0012'
| where customDimensions.eventId == 'RT0012'
| project timestamp
, aadTenantId = customDimensions.aadTenantId
, environmentType = customDimensions.environmentType
, environmentName = customDimensions.environmentName
, companyName = customDimensions.companyName
, clientType = customDimensions.clientType
, alObjectId = customDimensions.alObjectId
, alObjectType = customDimensions.alObjectType
, alObjectName = customDimensions.alObjectName
, extensionVersion = customDimensions.extensionVersion
, extensionName = customDimensions.extensionName
, extensionId = customDimensions.extensionId
, alStackTrace = customDimensions.alStackTrace
, sqlStatement = customDimensions.sqlStatement
, sqlServerSessionId = customDimensions.sqlServerSessionId
, snapshotId = customDimensions.snapshotId
, sessionId = customDimensions.sessionId
, usertelemetryId = case(
// usertelemetryId was introduced in the platform in version 20.0
toint( substring(customDimensions.componentVersion,0,2)) >= 20, user_Id
, 'N/A'
)
Database lock snapshot
This telemetry event can occur in two ways:
- when a database lock has timed out
- when a user or AL process has issued that a snapshot is taken
In the case of a database lock timeout, the BC server also takes a snapshot. Here, the Database lock snapshot trace event is associated with a specific Database lock timed out trace event. The value of the {snapshotId} maps to the snapshotId dimension of the Database lock timed out trace event that triggered this event.
General dimensions
| Dimension | Description or value |
|---|---|
| message | Database lock snapshot: {snapshotId} |
| severityLevel | 3 |
Custom dimensions
| Dimension | Description or value |
|---|---|
| aadTenantId | Specifies the Microsoft Entra tenant ID used for Microsoft Entra authentication. For on-premises, if you aren't using Microsoft Entra authentication, this value is common. |
| alExecutingMethodScope | Specifies the AL action that is running the transaction that caused the lock. |
| alObjectId | Specifies the ID of the running AL object that requested the lock. |
| alObjectName | Specifies the name of the running AL object that requested the lock. |
| alObjectType | Specifies the type of the running AL object that requested the lock, such as a page or report. |
| alStackTrace | The stack trace in AL. |
| component | Dynamics 365 Business Central Server |
| componentVersion | Specifies the version number of the component that emits telemetry (see the component dimension.) |
| deprecatedKeys | Specifies a comma-separated list of all the keys that have been deprecated. The keys in this list are still supported but will eventually be removed in the next major release. We recommend that update any queries that use these keys to use the new key name. |
| eventId | RT0013 |
| environmentName | Specifies the name of the tenant environment. See Managing Environments. |
| environmentType | Specifies the environment type for the tenant, such as Production, Sandbox, Trial. See Environment Types |
| extensionId | Specifies the AppID of the extension that was involved in the lock. |
| extensionName | Specifies the name of the extension that was involved in the lock. |
| extensionVersion | Specifies the version of that was involved in the lock. |
| sessionId | Specifies the ID of the session that requested the lock. |
| snapshotId | Specifies the ID of the database snapshot. All messages in the snapshot share this ID. |
| sqlLockRequestMode | Specifies the lock mode that determines how concurrent transactions can access the resource. For more information, see Lock Modes. |
| sqlLockRequestStatus | Specifies the current status of the lock, which can be one of the following values:
|
| sqlLockResourceType | Specifies the database resource affected by the lock. For example, DATABASE, FILE, OBJECT, PAGE, KEY, and more. |
| sqlServerSessionId | Specifies the ID of the SQL server session that requested the lock. |
| sqlTableName | Specifies the name of table on which the lock was held. |
| telemetrySchemaVersion | Specifies the version of the Business Central telemetry schema. |
Sample KQL code
This KQL code can help you get started analyzing database lock snapshots:
traces
| where timestamp > ago(2d) // adjust to your needs
| where customDimensions has 'RT0013'
| where customDimensions.eventId == 'RT0013'
| project timestamp
, aadTenantId = customDimensions.aadTenantId
, environmentType = customDimensions.environmentType
, environmentName = customDimensions.environmentName
, companyName = customDimensions.companyName
, snapshotId = customDimensions.snapshotId
, clientTypeHoldingLock = customDimensions.clientType
, alObjectTypeHoldingLock = customDimensions.alObjectType
, alObjectIdHoldingLock = customDimensions.alObjectId
, alObjectNameHoldingLock = customDimensions.alObjectName
, alStackTraceHoldingLock = customDimensions.alStackTrace
, extensionNameHoldingLock = customDimensions.extensionName
, extensionIdHoldingLock = customDimensions.extensionId
, extensionVersionHoldingLock = customDimensions.extensionVersion
, extensionPublisherHoldingLock = customDimensions.extensionPublisher
, sqlTableLocked = customDimensions.sqlTableName
, sqlLockResourceType = customDimensions.sqlLockResourceType
, sqlLockRequestMode = customDimensions.sqlLockRequestMode
, sqlLockRequestStatus = customDimensions.sqlLockRequestStatus
, sqlServerSessionId = customDimensions.sqlServerSessionId
, alSessionIdHoldingLock = customDimensions.sessionId
Troubleshooting locking issues with telemetry
The telemetry you see for lock timeouts only represents the session that is the victim in a locking issue, not the sessions that hold the locks. When analyzing database lock timeout telemetry, it's therefore useful to look at combined data from the Database lock timed out event and Database lock snapshot events. You might be lucky that the snapshot has captured information from locks that were held when the lock timeout occurred.
You can combine data from different events by using joins in your Kusto queries. For an example, see LockTimeouts.kql in the Microsoft/BCTech repository on GitHub. For more general information about using joins, see Joins in Azure Monitor log queries in the Microsoft Azure documentation.
See also
Monitoring and Analyzing Telemetry
Enable Sending Telemetry to Application Insights
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