YugabyteDB YSQL infrastructure boundary

Evidence-backed facts

1. YugabyteDB YSQL exposes a PostgreSQL-compatible distributed SQL API for relational schema, queries, transactions, and administration. informative
2. SELECT and metadata reads are distinct from DML, DDL, index, backup, restore, replication, and cluster-configuration operations. informative
3. Authentication, roles, grants, TLS, network policy, placement, transaction isolation, and deployment settings bound actual access. informative
4. YSQL documentation does not prove complete PostgreSQL compatibility, a cluster exists, a transaction committed, results are current, or security is configured. informative

Primary sources