Log file parallel write

Possible Causes:

•         LGWR waits while writing contents of the redo log buffer cache to the online log files on disk
•         I/O wait on sub system holding the online redo log files
• 
  

Actions:

•         Reduce the amount of redo being generated
•         Do not leave tablespaces in hot backup mode for longer than necessary
•         Do not use RAID 5 for redo log files
•         Use faster disks for redo log files
•         Ensure that the disks holding the archived redo log files and the online redo log files are separate so as to avoid contention
•         Consider using NOLOGGING or UNRECOVERABLE options in SQL  statements

Remarks:

•         Reference Note# 34583.1