**Glue Catalog**: AWS-only. Tables, schemas, partitions. Integrated with Athena, Glue, EMR. **Non-AWS**: Glue is not available. Need alternative—Hive Metastore (open source), Unity Catalog (Databricks), or cloud-native (BigQuery, Redshift). **Challenges**: Multi-cloud requires portable metadata. Hive Metastore can run on-prem or in cloud; Unity Catalog spans clouds for Databricks. Schema evolution, partition management differ. **Migration**: Export Glue catalog; import to Hive format....
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