CMDB CI class SNC Component

[Katie A]

I am in the process of purging our CMDB to set up integrations with external systems. I was able to delete all records in most of the CMDB tables.

However, there are some records that are automatically re-created after they are removed. These are class SNC Components. I think there might be a custom application or script written by a previous administrator that is populating these.

How can I remove these and find out the source of where they are originating?

[Atul Kumar2]

Hi,

You can perform the below steps for the initial root cause analysis .

1. Enable to Business rule debuging while deleting the records.

2. wait till the time new records are populated again.

3. Find the business rule and see what is condition which is triggering this creation of new object in ci table.

Regards,

Atul Kumar

[mechamberlain]

I'm not sure exactly what they are, but SNC probably stands for ServiceNow Corporation.   They occur in every instance I have access to, including my personal developer's instance.

I am speculating here, but I think they may be a "convenient" place for the SNow system to store some reference information about the particular instance.   For example in my "dev" instance there are three "SNC Component" class CI's:

app128048.sin1.service-now.com:dev99999999/dev/mapper/rootvg-rootlv

app128048.sin1.service-now.com:dev99999999/dev/sda1

app128048.sin1.service-now.com:dev99999999

1. First one looks like a reference to a SAN volume group (maybe)
2. Second one looks like a reference to a SCSI device
3. Third looks like a reference to the instance itself (maybe)?

Can't find any reference to the SMC class in the wiki...so it's a mystery to me.   All I can do is speculate...and I decided NOT to delete or modify these since I do not know their purpose.

I did find one reference in a script include related to Instance Monitoring...interesting:

Dates/times of creation and update of the SNC Component CI's also correspond to some instance events (instance upgrade and creation):

SO that's all I have to go on...I'm interested to know the "real" answer, though.

[sergiu_panaite · Accepted solution]

The records with class "SNC Component" are used in the ServiceNow Performance homepage where you see graphs for each node with statistics about memory, sessions, CPU, etc. If you delete these records they get recreated automatically, but as a general rule it's not recommended to delete them as it might break the graphs from ServiceNow Performance homepage.

Regards,

Sergiu