AWR中的physical writes
awr
You have high disk write activity with 64.2 per second.
You should drill-down and identify the sessions that are performing the disk writes as they can cause locking contention within Oracle. Also investigate moving your high-write datafiles to a smaller data buffer to improve the speed of the database writer process. In addition, you can dramatically improve your disk write speed by moving the high-write datafiles to a WriteAccelerator.
if you have High Update Systems ,The database writer (DBWR) process must sweep all of the blocks in db_cache_size when performing an asynchronous write. Having a huge db_cache_size can cause excessive work and most DBA’s segregate high-update and truncate objects into a separate, smaller data buffer such as db_2k_cache_size.
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