How To Fix SDBALM154 - Locked data collectors

SAP Error Message - Details

• Message type: E = Error

• Message class: SDBALM - SAP DB and liveCache Alert Monitoring

• Message number: 154

• Message text: Locked data collectors

What causes this issue?

The monitoring architecture locks a data collector if it detects serious
problems. The collector can then no longer be started, not even manually
in transaction RZ20.
Examples of serious problems that can cause a collector to be locked
are:
A data collector triggered a short dump.
The monitoring architecture detects that a data collector has been
running too long.
This node tells you whether one or more of the four data collectors
("Collector A", "Collector B", "Collector C", or "Collector D") have
been locked by the monitoring architecture.
Alerts
<ZH>Green:</>
None of the four data collectors have been locked.
<ZH>Red:</>
At least one of the four data collectors has been locked and can no
longer be started. The status message tells you which collector has been
locked.

How to fix this error?

Unlock the affected data collector or collectors:
In transaction RZ20, navigate to the data collectors for the affected
instance:
(RZ20 -> SAP CCMS Technical Experts Monitors -> All Monitoring Contexts
,,-> <(><<)>name of database collection> -> Collectors and Internals ->
Collectors -> Collector A/B/C/D)
Unlock the data collector:
Select the data collector.
Choose the "Details" pushbutton.
Select the top line (for the data collector).
In the menu, choose Edit -> Method Status -> Reset -> Data Collection
Method.
Then activate the data collector manually:
In the menu, choose Extras -> Activate Maintenance Function.
Select the data collector.
In the menu, choose Edit -> Nodes (MTE) -> Start Methods -> Start Data
Collection Method.
If the data collector turns green, the problem has been solved.
If you get a short dump when you try to start the data collector
manually, analyze and remove the cause of the error. Unlock the data
collector again and activate it manually.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SDBALM154 - Locked data collectors ?

  The SAP error message SDBALM154 indicates that there are locked data collectors in the SAP system. This typically occurs in the context of the SAP Database Performance Monitor (DBACOCKPIT) or when using the SAP Solution Manager for monitoring database performance.
  Cause:
  The error message is triggered when data collectors that are responsible for gathering performance metrics or statistics are locked. This can happen due to several reasons, including:
  
  Long-running transactions: If a transaction that is responsible for collecting data is taking too long to complete, it can lead to a lock.
  Deadlocks: Situations where two or more processes are waiting for each other to release locks can cause data collectors to be locked.
  Configuration issues: Incorrect settings in the monitoring configuration can lead to data collectors being unable to function properly.
  System performance issues: High load on the database or system can lead to delays in data collection processes.
  
  Solution:
  To resolve the issue of locked data collectors, you can take the following steps:
  
  
  Identify the Locked Data Collectors:
  
  Use transaction DBACOCKPIT or ST04 to check which data collectors are locked.
  Look for any long-running processes or transactions that may be causing the lock.
  
  
  
  Terminate Long-running Processes:
  
  If you identify any long-running processes that are causing the lock, consider terminating them if they are not critical. Use transaction SM66 or SM50 to monitor and manage processes.
  
  
  
  Check for Deadlocks:
  
  Investigate if there are any deadlocks occurring in the system. You can use transaction ST22 to check for dumps related to deadlocks.
  
  
  
  Adjust Configuration:
  
  Review the configuration settings for the data collectors in the DBACOCKPIT or Solution Manager. Ensure that they are set up correctly and that there are no conflicting settings.
  
  
  
  System Performance:
  
  Monitor the overall performance of the database and system. If the system is under heavy load, consider optimizing queries, increasing resources, or scheduling data collection during off-peak hours.
  
  
  
  Restart Data Collectors:
  
  In some cases, restarting the data collectors may resolve the issue. This can often be done through the DBACOCKPIT.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as DBACOCKPIT, ST04, SM66, SM50, and ST22 for monitoring and managing database performance.
  SAP Documentation: Refer to the official SAP documentation for detailed information on database monitoring and performance tuning.
  SAP Community: Engage with the SAP Community forums for insights and solutions shared by other users who may have encountered similar issues.
  
  By following these steps, you should be able to diagnose and resolve the issue related to the locked data collectors in your SAP system.