@aseelvn07 If this is happening in production and unsure about the reason, you should raise sev1 or sev2 ticket with Sailpoint for immediate support. You can even get the responses here, but there could be delay. So, if you haven’t open a ticket, please do it.
This could happen due to storage issue at database end. On priority to bring IIQ up, you should coordinate with your DB and Server team to allocate additional space, you can start with allocating 100GB for now.
Also, observe IIQ logs in all servers if there is any process which is keep running,. If yes, then you want to bring down the server till you bring IIQ up.
Once it is up, you might want to perform some cleaup on tables like spt_audit_events, provisioning_trasactions, task results,etc. If auto pruning is not set, you should enable it.
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This issue is occurring because the IdentityIQ database has reached its maximum size limit (SQL Error 40544), which prevents the application from performing required database operations and causes the page not to load.
As @santhirajumunganda mentioned,you need to either free up space by deleting old audit logs, task results, and unused data, when sufficient space is available, the application should start working normally again.
As the error clearly says, that identityiq database size is full, and since it;s qa environment. i would advise, if the database size can not be increased, will suggest you to empty or delete the data from audit tables, it will free up lot of spaces, and sailpoint will be accessible