This wait is signaled while the control file’s shared information is written to disk. This is an atomic operation protected by an enqueue (CF), so that only one session at a time can write to the entire database.
Wait Time: The wait time is the elapsed time of the write
| Parameter | Description |
|---|---|
| file# | This identifies the control file to which the session is currently writing |
| block# | Block number in the control file where the write begins. The block size is the as the physical block size of the port (usually 512 bytes, some UNIX ports have 1 or 2 Kilobytes). |
| blocks | The number of blocks that the session is trying to write |
Oracle Database Internal Mechanism 