pg_dump -h localhost -U root db > /home/{user}/dumps/db_20220720.bak
恢复数据库:psql -h localhost -U root -d db2 < /home/dumps/db_20220720.bak
备份表:pg_dump -h localhost -U root db -t table > /home/dumps/db_table_20220720.bak
恢复表:psql -h localhost -U root -d db2 -t table < /home/dumps/db_table_20220720.bak
