Get elapsed time for an individual command

In sqlplus, to see the elapsed time for an individual query, we can use the "set timing on" command.

SQL> set timing on;

SQL> select surname from personal_details where firstname='udvas';

Elapsed: 00:00:02.52

Again, the "set timing on" command is a SQL*Plus command, but we can measure run time for Oracle SQL with a variety of Oracle tools.

Sometimes when working on SQL command optimizations, all that is desired is a rough timing estimate; namely, the SQL*Plus client elapsed execution time, or simple clock time. Often that simple metric is sufficient for some very basic tuning needs. SQL*Plus has a built-in capability to do exactly this - it is the SET TIMING  command. It essentially records the clock time before and after the SQL command execution, then displays the run time difference.

This commands works for the single command.