The Log File Parallel Write wait event occurs when the Log Writer (LGWR) process is waiting to write the contents of the redo log buffer cache to the online log files on disk. This wait event typically indicates I/O contention related to the disk subsystem that holds the online redo log files.
Read MoreThis typically occurs when the database session requests a large amount of data, often due to full table scans or fast full index scans.
Read MoreThe DB File Sequential Read wait event signifies that the user process is reading a buffer into the SGA buffer cache and is waiting for a physical I/O call to return. A sequential read is a single block read. Single block I/Os are usually the result of using indexes
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