PostgreSQL 7.2.1 Documentation
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# 1.8. libpq Tracing Functions

- `PQtrace` Enable tracing of the frontend/backend communication to a debugging file stream.

      void PQtrace(PGconn *conn
                   FILE *debug_port)

- `PQuntrace` Disable tracing started by `PQtrace`.

      void PQuntrace(PGconn *conn)

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