SAP HANA Won't Start? What to Check First

HANA's in-memory, columnar architecture means a failed start does not automatically mean the data is gone. The database persists its state through savepoints and redo logs on disk, and much of what stops HANA from starting again is a service, configuration or storage-visibility problem rather than damage to that persisted data. The first job is telling these apart before reaching for a restore.

The `nameserver_alert` and `indexserver` trace files in the HANA trace directory usually name the immediate cause: a missing data volume, a full filesystem, a licence or memory limit, or an explicit corruption message. Reading these before taking any action narrows the problem to one of a few categories, and each one calls for a different response.

If the underlying storage failed and has since been replaced or reattached, HANA may simply not see its data and log volumes in the expected paths. Confirm the volumes are mounted and visible at the operating system level before assuming the savepoint or log data itself is damaged. A host that failed and was rebuilt can also lose local configuration that HANA needs, without any loss to the data volumes themselves.

HANA recovers to the last consistent savepoint using the redo log to replay changes since that point. If the redo log is damaged or a log segment is missing, automatic crash recovery on restart can fail even though the last savepoint itself is intact. In that case, recovery to the last savepoint, accepting the data since then as lost, is often possible even when a full log-based recovery is not.

In a multi-tenant database container, a problem with one tenant does not necessarily affect the others or the system database. Check whether only one tenant is failing to start before treating the whole instance as down, since a single affected tenant is often a narrower and less urgent problem than it first appears.

Do not run a full system restore from backup as a first response before checking the trace files, since a restore is often unnecessary and always costs time. Do not delete and recreate data or log volumes to "start fresh" without imaging them first, in case a later recovery attempt on the original data becomes necessary. Coordinate with whoever manages backint-based backups before changing anything in the backup catalog.

Ask a specialist when the trace files point to redo log damage, when a restore itself is failing partway through, when a System Replication secondary won't take over cleanly, or when the cause isn't clear after checking storage visibility and configuration. We work alongside your existing SAP Basis or DBA team rather than around them, and we say plainly what looks realistic after an assessment.