????????1???????????????md5???trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            trust
# IPv6 local connections:
host    all             all             ::1/128                 trust
?????????????????Σ?trust????????????????????????
???????????????????????????????????????????????ó?trust?????????????????
????PostgreSQL ???????????κβ???????????????????????????????????洢?? pg_authid ???????檔????????? SQL ???????? CREATE USER ?? ALTER USER ?????(???? CREATE USER foo WITH PASSWORD 'secret'; ???????????????????????????洢??????????????????????????????
??????PostgreSQL 8.2.3 ?????????20.2 ?????????
?????????????????pg_authid?????postgres???????????????