Oracle® Database 11g / 12c / 18c error codes ORA-44730: XML Index [string] is not usable at the moment

ORA-44730: XML Index [string] is not usable at the moment

Oracle Error Code: ORA-44730

Cause: The async XML Index could not be used since ORACLE is not open for query.

Action: Try the same query again when ORACLE is open for query, or use NO_XMLINDEX_REWRITE hint.