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copy table (device_id,src_ip,src_transfer_ip,dst_ip,src_port,dst_port,transfer_port,type,ip_version,protocol_id,rule_id) from '/data01/pg92/t_log_nat1.dmp';
copy (select device_id,src_ip,src_transfer_ip,dst_ip,src_port,dst_port,transfer_port,type,ip_version,protocol_id,rule_id from t_log_nat
where id in
(select floor(random() * (max_id - min_id))::int
+ min_id
from generate_series(1,100000),
(select max(id) as max_id,
min(id) as min_id
from t_log_nat) s1
)) to '/data01/pg92/t_log_nat1.dmp';