Ryan Malloy
495128c679
Investigation of the Phase 21 baseline finding that executemany(N) cost scaled linearly per-row (1.74 ms x N) regardless of batch size. Root cause: every autocommit=True INSERT forces a server-side transaction-log flush. Not a wire-protocol bug. Numbers: * executemany(1000) autocommit=True: 1.72 s (1.72 ms/row) * executemany(1000) in single txn: 32 ms (32 us/row) 53x speedup from changing the transaction boundary, not the driver. Pure protocol overhead is ~32 us/row -> ~31K rows/sec sustained throughput on a single connection. Comparable to pg8000. Added test_executemany_1000_rows_in_txn benchmark to make this visible. Updated README headline numbers and added a "Performance gotchas" section explaining when autocommit=False matters. Decision: don't pipeline. The remaining 32 us is already excellent; the autocommit gotcha is the real user-facing footgun. Docs > code. If someone reports needing >31K rows/sec single-connection, that becomes Phase 22.
1256 lines
43 KiB
JSON
1256 lines
43 KiB
JSON
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