Troubleshooting Incomplete Runbooks: Diagnosing and Resolving Orchestrator Execution Issues

Table of Contents

System Center Orchestrator (SCO) stands as a foundational component within the Microsoft System Center suite, designed to automate IT processes and workflows across diverse systems. At its core, SCO leverages “runbooks,” which are graphical representations of automated tasks. These runbooks can be simple, single-action workflows or complex sequences involving multiple systems and decision points. A common and powerful pattern in Orchestrator is the use of parent-child runbooks, where a main runbook triggers and often waits for the completion of one or more sub-runbooks to perform specific, modular tasks.

The seamless execution of these runbooks is paramount for maintaining operational efficiency and reliability in an automated environment. However, scenarios can arise where triggered runbooks fail to complete as expected, leading to stalled processes, resource waste, and potential service interruptions. This article delves into a specific and often perplexing issue where runbooks, particularly those triggered via the invoke method, never reach a completed state. We will explore the tell-tale symptoms, pinpoint the underlying cause related to SQL Server configuration, and provide a precise resolution to restore your Orchestrator environment to full functionality.

Understanding the Symptoms of Incomplete Runbooks¶

When a runbook, especially a child runbook invoked by a parent, fails to complete, the immediate observation in the Orchestrator Runbook Designer or Orchestrator Console might be that the runbook remains in a “running” or “pending” state indefinitely, or it might simply disappear from active runs without a clear success or failure status. This ambiguity can make initial diagnosis challenging. The issue specifically arises when a runbook utilizes the invoke method to trigger a child runbook, and this child runbook subsequently fails to finish its execution.

A deeper look into the policy module logs is crucial for uncovering the true nature of the problem. These logs, which record the detailed activities and outcomes of runbook executions, will typically contain specific error messages that indicate a process termination. The characteristic log entry for this particular issue will feature an _com_error message, often accompanied by “Unspecified error” and a specific HRESULT error code, -2147467259. This pattern of errors is a strong indicator of the underlying SQL Server configuration problem.

Consider a scenario where a master runbook, designed to provision a new user, invokes a child runbook responsible for creating the user’s mailbox. If the mailbox creation runbook gets stuck or terminates unexpectedly without reporting completion, the master runbook will likely remain in a waiting state or eventually time out, causing the entire user provisioning process to fail. The key diagnostic indicator in such cases is the _com_error within the policy module log, signifying that the Orchestrator runtime engine encountered an unexpected termination during an operation that likely involved interaction with the SQL database. This error code often points to a generic COM (Component Object Model) or RPC (Remote Procedure Call) failure, suggesting a communication breakdown or an unexpected result from a system call.

<MsgCode>_com_error</MsgCode>
<Params>
    <Param>Unspecified error</Param>
    <Param></Param>
    <Param>-2147467259</Param>
</Params>
</Exception></Prev>
</Exception></Prev>
</Exception>
1 Process terminated: exception caught.

This snippet from the log signifies that the Orchestrator process encountered a critical exception, leading to its abrupt termination. The “Unspecified error” combined with the negative HRESULT indicates a low-level system error, often related to inter-process communication or database interactions. Recognizing this specific log pattern is the first critical step in resolving the incomplete runbook issue.

Pinpointing the Root Cause: SQL Server Configuration¶

The fundamental reason behind the described runbook execution failures lies within a specific configuration setting in SQL Server: disallow results from triggers. System Center Orchestrator relies heavily on its SQL Server database for storing runbook definitions, runbook instances, runbook progress, and configuration data. The interaction between Orchestrator’s runbook execution engine and the SQL database is continuous and critical.

A SQL trigger is a special kind of stored procedure that automatically executes or “fires” when a specific event occurs in the database server. These events can include data modification language (DML) events like INSERT, UPDATE, and DELETE on a table or view, or data definition language (DDL) events like CREATE, ALTER, or DROP statements. Triggers are often used to enforce business rules, maintain data integrity, or log changes.

The disallow results from triggers setting in SQL Server controls whether triggers are permitted to return result sets to the client application that initiated the database operation. When this setting is enabled (set to 1), triggers are prevented from returning any data. While this can be a security measure or a way to enforce predictable behavior in certain database applications, it directly conflicts with how Orchestrator’s invoke method might operate internally. It is highly probable that the invoke method or underlying Orchestrator database operations utilize a mechanism that, either directly or indirectly through an internal trigger, expects a result set or a confirmation message back from the SQL database. When disallow results from triggers is set to 1, this expected communication is blocked, causing the Orchestrator process to encounter the _com_error and terminate.

The disallow results from triggers option is an advanced server configuration option. It’s not typically enabled by default in SQL Server installations unless specific security policies or custom configurations are applied. Therefore, if you encounter this issue, it suggests that this setting was explicitly modified from its default state, either manually or by an automated process. Understanding this interaction between Orchestrator’s reliance on SQL Server and the implications of certain database configuration settings is key to effective troubleshooting.

Orchestrator’s Database Interaction Model¶

To further illustrate, consider Orchestrator’s interaction with SQL Server as a sophisticated conversation. When a runbook is invoked, especially using the invoke method which suggests a direct and potentially synchronous call, Orchestrator sends a command to the database. This command might, in turn, cause a trigger within the database to fire. If this trigger is designed to return status information, and disallow results from triggers is enabled, the database effectively “hangs up” on Orchestrator without providing the expected response. This lack of response or an unexpected termination of the communication channel leads Orchestrator to register the generic _com_error and ultimately terminate the runbook process, leaving it incomplete.

Comprehensive Resolution Steps¶

Resolving this issue involves modifying the disallow results from triggers setting in your SQL Server instance, changing its value from 1 to 0. This allows triggers to return results, thereby restoring the expected communication flow between Orchestrator and its database. Before proceeding with any SQL Server configuration changes, it is always recommended to perform a full backup of your Orchestrator database and any other critical databases on the SQL instance. Ensure you have the necessary SQL Server administrator (SA) permissions or equivalent to execute these commands.

The following steps will guide you through verifying the current setting and then modifying it if necessary:

Step 1: Verify the Current Setting

Open SQL Server Management Studio (SSMS) and connect to the SQL Server instance hosting your System Center Orchestrator database. Open a new query window and execute the following SQL statements. These commands are standard procedures for checking advanced configuration options in SQL Server.

USE master;
EXEC sp_configure 'show advanced options', 1;
RECONFIGURE;
EXEC sp_configure 'disallow results from triggers';

Explanation of Commands:

• USE master;: This command ensures that your current database context is set to the master database. System-wide configuration options are typically managed from the master database.
• EXEC sp_configure 'show advanced options', 1;: The sp_configure system stored procedure is used to display or change global configuration settings for the SQL Server instance. By setting 'show advanced options' to 1, you enable the visibility of advanced configuration options, which are hidden by default.
• RECONFIGURE;: This command applies the changes made by sp_configure. In this case, it makes the advanced options visible. Without RECONFIGURE, the sp_configure command for showing advanced options would not take effect immediately.
• EXEC sp_configure 'disallow results from triggers';: After enabling advanced options, this command will display the current value of the disallow results from triggers setting. The output will show the name of the option, its minimum and maximum allowed values, the config_value (the value to which it will be set on the next RECONFIGURE), and the run_value (the currently active value).

If the run_value for 'disallow results from triggers' is 1, then this is indeed the cause of your Orchestrator issues.

Step 2: Change the Setting to 0

If the verification step confirms that the run_value is 1, proceed with changing it to 0. Execute the following commands in a new query window in SSMS:

EXEC sp_configure 'disallow results from triggers', 0;
RECONFIGURE;

Explanation of Commands:

• EXEC sp_configure 'disallow results from triggers', 0;: This command sets the config_value for disallow results from triggers to 0. This means that once RECONFIGURE is executed, triggers will be allowed to return results to client applications.
• RECONFIGURE;: This command applies the pending configuration change. For many sp_configure options, RECONFIGURE immediately updates the run_value without requiring a SQL Server service restart. The disallow results from triggers setting is one such option.

Step 3: Post-Resolution Verification and Testing

After executing the RECONFIGURE command, it is a good practice to re-run the EXEC sp_configure 'disallow results from triggers'; command to confirm that the run_value has successfully updated to 0. Once confirmed, you can proceed to re-test your Orchestrator runbooks. Restarting the Orchestrator Runbook Service on your Orchestrator Management Server and Runbook Servers is often a good measure to ensure that they pick up the updated SQL Server configuration, although for this specific setting, it may not be strictly necessary as the change primarily affects database interactions.

Run the problematic parent-child runbooks again, or any runbook that utilizes the invoke method and previously failed. Monitor the Orchestrator console for completion and check the policy module logs to ensure that the _com_error related to process termination no longer appears. Successful completion of the runbook indicates that the issue has been resolved.

More Information and Broader Context¶

While this specific article addresses a critical SQL Server configuration issue, it’s important to place this troubleshooting scenario within the broader context of System Center Orchestrator management. The issue described, involving the disallow results from triggers setting, is a known cause for specific runbook failures and has been addressed previously through various knowledge base articles and product updates over time. This indicates its significance as a recurrent problem for Orchestrator administrators.

Understanding SQL Server Configuration in Orchestrator Environments¶

The performance and stability of your System Center Orchestrator environment are intrinsically linked to the underlying SQL Server instance. Incorrect or suboptimal SQL Server configurations can lead to a wide array of issues, ranging from slow runbook execution and database timeouts to outright runbook failures as seen in this scenario. Database administrators (DBAs) and Orchestrator administrators should collaborate closely to ensure that the SQL Server instance supporting Orchestrator is correctly configured, adequately resourced, and regularly maintained. Key areas of focus typically include:

• Database Sizing and Growth: Ensuring sufficient disk space and appropriate auto-growth settings for the Orchestrator database.
• Indexing and Statistics: Regular maintenance of database indexes and statistics for optimal query performance.
• Transaction Log Management: Proper sizing and backup of transaction logs to prevent database outages.
• SQL Server Agent: Ensuring the SQL Server Agent is running, as it’s often used for maintenance jobs and sometimes by Orchestrator for scheduled tasks.
• Network Connectivity and Latency: High latency or unstable network connections between Orchestrator servers and the SQL server can also manifest as mysterious errors.

General Troubleshooting Principles for Orchestrator¶

When faced with Orchestrator runbook issues, a systematic troubleshooting approach is invaluable:

1. Check Orchestrator Logs: Always start with the Orchestrator-specific logs, including the Policy Module Logs, Management Server Logs, and Runbook Designer Logs. These logs provide the most direct insight into runbook execution failures.
2. Review Event Logs: Check the Windows Event Logs (Application, System, and sometimes Security) on the Orchestrator Management Server, Runbook Servers, and the SQL Server. Look for correlated errors or warnings around the time of the runbook failure.
3. Verify Permissions: Ensure that the Orchestrator service accounts (Runbook Service Account, Management Server Account) have the necessary permissions on the SQL Server database and any systems they interact with.
4. Resource Utilization: Monitor CPU, memory, and disk I/O on Orchestrator servers and the SQL Server. Resource bottlenecks can cause timeouts and unexpected process terminations.
5. Network Connectivity: Confirm stable network connectivity between all Orchestrator components and the SQL Server.
6. SQL Server Health: Beyond specific configuration settings, ensure the SQL Server itself is healthy, performing well, and not experiencing issues like deadlocks, severe blocking, or disk I/O contention.

The _com_error with “Unspecified error” and HRESULT -2147467259 is a classic example of how a low-level system configuration can disrupt complex application functionality. By understanding the interaction between Orchestrator’s runtime and the SQL Server, and specifically the implications of the disallow results from triggers setting, administrators can quickly diagnose and resolve this particular runbook execution issue, ensuring their automation workflows run smoothly.

This particular fix is crucial for maintaining the reliability of your automated workflows. It highlights the intricate dependencies between application logic and underlying database configurations. While often overlooked, such settings can have profound impacts on system stability. Regularly reviewing and understanding these configurations is a hallmark of proactive system administration.

Do you have experience with similar Orchestrator issues, or have you encountered other obscure SQL Server settings that impacted your automation? Share your thoughts and experiences in the comments below! Your insights can help the wider community.