Redo Log Buffer (Oracle)

This buffer (memory area in the SGA) holds information about changes made to data and objects in the database. The Oracle background process LGWR writes entries from the redo log buffer to the on-line redo log files on the disk.

Allocation fault rate shows the ratio of times Oracle attempted to find space available space in the redo log buffer and was unsuccessful. When this happens, the user process must wait until space in the buffer is free.