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Central Offload DB – Trend data: Files that do not match the time configured

168 views3rd April 2025central database data offload
8
Catarina Grilo [SLC] [DevOps Enabler]1.53K 3rd April 2025 0 Comments

Hi DOJO,

I have configured a central offload database to a file. The offload interval is 30 minutes, but my trend data offload is configured for every parameter once every day at 05:00:

So, I expect a file in C:\Skyline DataMiner\System Cache\Offload\Data every day at 05:00, which I get.

However, I notice that I also have some other files there at other times of the day. I analyzed them, and they are related to a dynamic table where some columns are trended. However, this file does not specify a specific trend column, it only has the table ID, and it has no trend value, example:

Why is this file being generated with only this entry and outside of my time configuration?

Gery Ghemrani Answered question 3rd April 2025

1 Answer

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Gery Ghemrani37 Posted 3rd April 2025 1 Comment

Hi Catarina,

From what I've seen, there is not only the trend data that is offloaded to C:\Skyline DataMiner\System Cache\Offload\Data. There you'll find your trend data file at around your configured date (+/- 10 mins I'd say).

Thing is, all the files located in the above directory are not all dedicated to Trending and you will also have some about System alarms and so on. I think you should disable the "alarm data" and then you should have only the trend file at around your configured date.

Please let me know if that solves your issue, but to my mind one simple way to make any question go away would be to have different names in the files, depending what is included in them : i.e YYYY_MM_DD_HH_MM_SS_Trending.csv, YYYY_MM_DD_HH_MM_SS_SystemAlarm.csv & so on.

Also, another interesting thing would be to be able to separate into multiple files the trending, depending on the protocol treated.

Catarina Grilo [SLC] [DevOps Enabler] Posted new comment 4th April 2025
Catarina Grilo [SLC] [DevOps Enabler] commented 4th April 2025

Hi Gery,

Thank you for your reply.
However, in C:Skyline DataMinerSystem CacheOffload, there are multiple folders, each storing different types of offload data. For example:
– The Data folder stores real-time trends.
– The Dataavg folder is used for average trends.
– The Service_Alarms folder stores links between alarms contained in services and those services.
More details on this structure are in https://docs.dataminer.services/user-guide/Advanced_Functionality/Databases/Optional_database_configurations/Offload_database/Structure_of_the_offload_database.html.

In my case, I want to understand why there is a file in the Data folder (which contains real-time trends) related to an update of a dynamic table without a value. The iStatus value is -16, indicating that the row was deleted from the dynamic table.
I would like to know:
– Why is this file appearing in the trend data?
– Why is it being generated outside the configured time of 05:00?

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