Printing of logs in Rust development PostgreSQL stored procedure

You can use Rust's standard macros directly to print:

eprintln!("test_sql_speed: {:?}", difference);

will be printed to PostgreSQL's STDERR.

If the log dump function of PostgreSQL is not enabled, the default is:

/var/log/postgresql/

in the log file in the directory.

If the log dump function is enabled, it will go to the log directory under the data directory, but this speed is a bit slow, and it will take a few seconds to come out.

It is best not to open log dumps for local debugging, but directly monitor the /var/log/postgresql/postgresql-10-main.log file.

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