Hi. I have a quick question here, For the awr report, the 'Top 5 Timed Events' section, does anybody knows how the '%Total Call Time ' is calculated for each event listed there? Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time Wait Class ------------------------------ ------------ ----------- ------ ------ ---------- PX Deq Credit: send blkd 5,682,600 3,816 1 39.8 Other db file scattered read 91,236 1,681 18 17.5 User I/O CPU time 1,347 14.0 log file sync 99,426 752 8 7.8 Commit log file parallel write 97,921 523 5 5.4 System I/O Thanks, Lei