how to calculate or know seq_scan scan how many blocks every time

hello:
   i know oracle scatter read blocks,can set db_file_multiblock_read_count
every time,
   i see postgres,it exists scatter read blocks,it is seq_scan,how to know
scan many bloks every time?



--
View this message in context:
http://postgresql.1045698.n5.nabble.com/how-to-calculate-or-know-seq-scan-scan-how-many-blocks-every-time-tp5717892.html
Sent from the PostgreSQL - general mailing list archive at Nabble.com.