While starting Appian Engines do we need to do checkpoint first before starting Appian Engines for the proper startup ?

The relevant error will be:

Inconsistent DBID on GW1. Server Database

What you want to do is:

1. Takes notes on the engines showing FATAL
2. stop-suite
3. Make sure no k.exe process remains active. If one remains but is not using CPU, kill it
4. Use <APPIAN_HOME>\\server\\_scripts\          ools\\repair passing the full name with path included of the latest engine database file *.kdb for the engine to repair
5. Rename the .repaired file to be the highest numbered one

Alternatively if you are able to raise support cases on your customer's behalf, you can work with Appian Support on this.

The relevant error will be:

Inconsistent DBID on GW1. Server Database

What you want to do is:

1. Takes notes on the engines showing FATAL
2. stop-suite
3. Make sure no k.exe process remains active. If one remains but is not using CPU, kill it
4. Use <APPIAN_HOME>\\server\\_scripts\          ools\\repair passing the full name with path included of the latest engine database file *.kdb for the engine to repair
5. Rename the .repaired file to be the highest numbered one

Alternatively if you are able to raise support cases on your customer's behalf, you can work with Appian Support on this.