Oracle KGX mutexes appeared more than 7 years ago. However, mutex waits are still obscure. Oracle Documentation provided only brief description of mutex wait events without any information about wait durations and timeouts.
Look at the following timeline:
The way an Oracle process waits for a latch. This seems trivial. Oracle 11.2 documentation explicitly states about “latch free” wait event:
“… The wait time increases exponentially and does not include spinning on the latch (active waiting). The maximum wait time also depends on the number of latches that the process is holding. There is an incremental wait of up to 2 seconds…”
In this post, I would like to show that this exponential backoff was obsoleted in Oracle 9.2. Since that time, all the Oracle versions use completely new latch wait posting mechanism and FIFO queuing for all, except one latch.
Oracle no longer uses “repeatedly spin and sleep” approach. The process spins and waits only once. The pseudo code for contemporary latch acquisition should looks like:
Immediate latch get
Spin latch get
Add the process to the queue of latch waiters
Sleep until posted