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libpq Tracing Functions

PostgreSQL
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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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