WAIT #1: nam="db file scattered read" ela= 5 p1=4 p2=1435 p3=25
WAIT #1: nam="db file scattered read" ela= 7 p1=4 p2=1461 p3=32
WAIT #1: nam="db file scattered read" ela= 7 p1=4 p2=1493 p3=32
ela 为 等待的微秒数
p1 为file_id
p2为block_id
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