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SMON_SCN_TIME and ORA-8161? Digging deeper

In the recent versions of the Oracle database, we’ve had the ability to convert between a System Change Number (SCN) and the approximate time to which that SCN pertains. These functions are unsurprisingly called SCN_TO_TIMESTAMP and TIMESTAMP_TO_SCN. The only potential misnomer here is that even though the functions are called “timestamp” and return a datatype of timestamp, on most platforms you are going to notice that the granularity doesn’t run down into fractions of seconds

SQL> select scn_to_timestamp(14816563713652) from dual;

08-JUN-19 AM

This all looks great until you start poking around too far into the past, and you end up in territory like this: