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buffer busy waits
A buffer busy wait occurs if multiple processes want to access a buffer in the buffer cache concurrently.
The type of buffer that causes the wait can be queried with v$waitstat. v$waitstat lists the waits per buffer type for buffer busy waits only. Therefore, the following SQL statement always returns 0
select (select total_waits from v$system_event where event='buffer busy waits') - /* minus */ (select sum(count) from v$waitstat) from dual;
Type of block waited for
Buffer busy waits is one of the events that Oracle records while it is running.