timers in sqlplus

this is one of: after all these years I really didn’t know this

nested timers in sqlplus:

SYS@orcl> timing start a1
SYS@orcl> timing start   a2
SYS@orcl> timing start     a3
SYS@orcl> timing show
timing for: a3
Elapsed: 00:00:03.39
SYS@orcl> timing stop
timing for: a3
Elapsed: 00:00:07.37
SYS@orcl> timing show
timing for: a2
Elapsed: 00:00:16.55
SYS@orcl> timing stop
timing for: a2
Elapsed: 00:00:20.53
SYS@orcl> timing show
timing for: a1
Elapsed: 00:00:33.45
SYS@orcl> timing stop
timing for: a1
Elapsed: 00:00:36.44

good to know for complex scripts …