r2dbc: Spring Data R2DBC CRUD, DatabaseClient, reactive transactions and Testcontainers Postgres (post 2)

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
2026-10-29 04:16:34 +00:00
parent 89358e7b7c
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+INDICATIVE, shared 2-vCPU sandbox, database in a container on the same host.
+4000 x 'SELECT ... WHERE id = ?' per round, 100 in flight, pool size 20, 5 rounds after 1 warm-up each.
+queries/second, sorted:
+  R2DBC DatabaseClient      : [233, 288, 361, 427, 435]  median=361
+  JDBC + virtual threads    : [1240, 1281, 1348, 1558, 3084]  median=1348