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This wait event occurs when the session needs a free buffer, so it can bring a data block into the buffer cache, and is waiting for a buffer that is not dirty to become available. This can occur if DBWR is not writing dirty buffers to disk fast enough.
Time spent by the various sessions waiting for hosted components, such as, but not exclusively, CLR.
Time spent by the various sessions waiting for the completion of I/O operations required to carry out a bulk load I/O.
While bulk loading significantly reduces the amount of I/O activity required for loading large amounts of data to the database inside of a single transaction, this operations still takes a relatively long time to complete.
Time spent by the various sessions waiting for I/O operations to complete.
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