Hi, Does anyone has some more information about the DBA_HIST_FILESTATXS view? I?m trying to understand the difference of the read_time/write_time columns and the time column. According to the reference guide, the time column holds the wait time, but which waits? It is my understanding that all reads list their time in the ?db file sequential / scattered read? wait events, but the value in the time column seems to be always smaller then the values in the readtime column. Also, are all columns cumulative or only the SINGLEBLKRDTIM column? Regards, Freek D'Hooge Uptime Oracle Database Administrator email: freek.dhooge@xxxxxxxxx tel +32(0)3 451 23 82 http://www.uptime.be -- //www.freelists.org/webpage/oracle-l