The Manager database fails to start

Below are some of the reasons for the Manager database failing to start on a Windows system.

The Manager database process is already running. This can be verified by opening Windows Task Manager and looking for mariadbd.exe with Memory foot print of hundreds of MB.
Start the service "Trellix IPS Manager Database" from services window. If the service has not started, check for the reason of failure in <DB_Install_Dir>\data\<hostname>.err file.
Note
The default Manager database directory is %programfiles%\Trellix\IPS Manager\MariaDB.
In the command prompt, navigate to <DB_Install_Dir>\bin and run "mariadbd --version" manually. If the service has started, the message is displayed as shown below:
mariadbd Ver 10.5.15-MariaDB-log for Win64 on AMD64 (mariadb.org binary distribution)
Note
The version number and commercial license definition vary across Manager versions.

If unexpected database service shutdown occurs, check the <DB_Install_Dir>\data\<hostname>.err file for possible reason. Also, during this unexpected shutdown, MariaDB creates a minidump that is, mariadbd.dmp in the data directory. If necessary, this file can be used for further analysis.

Below are some of the reasons for the Manager database failing to start on a Linux system.

The Manager database process is already running. This can be verified by executing database status on CLI.
Start the service by executing database start on CLI. If the service has not started, then, check for the reason of failure in <hostname>.err file. Execute the command show log file <hostname>.err to open the file.
Execute show databaseVersion on CLI. If the service has started, the message is displayed as shown below:

Manager@USER> show databaseVersion

/opt/IPSManager/MariaDB/bin/mariadb Ver 15.1 Distrib 10.5.15-MariaDB, for Linux-systemd (x86_64) using readline 5.1

Note
The version number and commercial license definition vary across Manager versions.

If unexpected database service shutdown occurs, check the <hostname>.err file for possible reason. Also, during this unexpected shutdown, MariaDB creates a minidump named mariadbd.dmp in the data directory. If necessary, this file can be used for further analysis.