recovery fail

I'have made a backup my DB with pg_dump its (' pg_dump -U username dbname >backupfilename.sql.gz. When i want to
restoreit ( I drop the old database ,creaete new and language to it and i type a command 'cat
backupfilename.sql.gz|gunzip|/usr/local/pgsql/bin/psql-U username dbname) this backup restore my all tables but its
losesrelations to some tables. and when it is restoring sysem send me messeges about missing relations . I think it is
aboutorder in this recovery data from backup. How to resolve this problem? 


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