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Performance Implications of Write Bitmaps  



There are two aspects of write bitmaps that affect performance; the message traffic that occurs between local and master write bitmaps and the size requirements of each bitmap.

The message traffic can be adjusted by changing the message mode. Single message mode is the default. Buffered message mode can improve overall system performance, but the time to record each process's write in the master write bitmap usually takes longer. These modes are described in detail in System Parameters for Managing Write Bitmap Messages and Shadow Set Limit.

Additional memory is required to support write bitmaps, as described in Memory Requirements. Depending on the memory usage of your system, it may require additional memory.


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