Hi
We quite often see a number of DIA and ENQ processes in status 'running' with a Semaphore 26 error in SM66/SM50. Most of these (but not always all) show reads on tables SAPLSENA and SAPLSENT.
Many other processes - DIA, BTC and UPD - then have the 'stopped ENQ' status and also show reads on tables SAPLSENA, SAPLSENT and SAPLTHFB.
This doesn't last for that long but seems to be a common occurrence and we often get performance complaints during this time.
Note 33873 - What do the semaphores mean? - shows that this is the ENQ-TABLE-Semaphore.
One suggestion was that a filesystem backup running at the time was locking a file (enque related file??) but we have not been able to substaniate this. We could run the command fuser but which file is being locked?
We have already followed SAP Note 1384191 - Transaction SM50: Many processes with report SAPLSENA, but could not see any useful indicators in the log file produced.
Has anyone else experienced this or know how to check what is causing this?
Thanks
Ross