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How to investigate failover Database issue

Solved1.70K views17th November 2020Failover
3
Mieke Dryepondt [SLC] [DevOps Advocate]3.59K 17th November 2020 0 Comments

How to investigate the root cause of a Failing status on the Failover database status.

The reason shown is: object reference not set to an instance of an object.

Is there a log file with more info on what caused the error?

Mieke Dryepondt [SLC] [DevOps Advocate] Selected answer as best 17th November 2020

1 Answer

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Thijs Vanovenacker [SLC] [DevOps Advocate]2.20K Posted 17th November 2020 2 Comments

Hi Mieke,
I would start the investigation by looking at the following two logfiles on your DataMiner server:  SLDBConnection and SLDataGateway.

Paths:
“C:\Skyline DataMiner\logging\SLDBConnection.txt”
“C:\Skyline DataMiner\logging\SLDataGateway.txt”

I believe you will find your first hints on what’s going wrong in here.
Goodluck!

Mieke Dryepondt [SLC] [DevOps Advocate] Posted new comment 19th November 2020
Wouter Demuynck [SLC] [DevOps Advocate] commented 17th November 2020

– MySQL => see SLDatabase[SLNet].txt (a simple query is being executed to check the database)
– Cassandra => see SLDBConnection.txt
You can also try to send the GetCassandraHealthMessage and/or DatabaseHealthRequest through the SLNetClientTest tool and interpret the output. “Database Status” reports problems when the status isn’t GREEN or when the number of nodes is less than 2.

Mieke Dryepondt [SLC] [DevOps Advocate] commented 19th November 2020

Hi Thijs and Wouter,
The problem was that the cassandra password was not correct.
When looking in the SLDBConnection I could find that prior to the vague exception there was one about the password. Most likely because the login failed, an other operation caused the exception.

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