KNOWLEDGE BASE

Error "Skipping schema validation due to unexpected error (...) Empty set of migrations" During Backup and Restore


Published: 24 May 2017
Last Modified Date: 24 May 2017

Issue

When restoring Tableau Server from a backup, the following error occurs: 
===== Skipping schema validation due to unexpected error: java.lang.IllegalStateException: Empty set of migrations
Backtrace:
com/tableausoftware/dbmigration/signature/SchemaSignatureUtil.java:158:in `removeMigrationQueryResults'
com/tableausoftware/dbmigration/signature/SchemaSignatureUtil.java:83:in `signaturesMatch'

Environment

Tableau Server

Resolution

If there is no visible negative behavior in Tableau Server, you can ignore this message.

Cause

This message does not mean that there is an issue with the backup restoration or with Tableau Server. When restoring a backup, the schema validation makes several queries of the Repository database and makes a list of the results.
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