Question

师我需要备份和恢复一个PostgreSQL数据库。我的os版本是Ubuntu-14.04 64bit，PostgreSQL是：

gid: ~/works $ pg_config --version
PostgreSQL 9.3.15

我使用pg_dump来备份数据库：

gid: ~/works $ pg_dump -U db_name_user -F t db_name > db_name.tar

我尝试使用pg_restore恢复数据库并失败：

gid: ~/works $ pg_restore -U db_name_user -F t -d db_name db_name.tar

pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 3621; 0 0 COMMENT EXTENSION plpgsql 
pg_restore: [archiver (db)] could not execute query: ERROR:  must be owner of extension plpgsql
Command was: COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';

pg_restore: WARNING:  no privileges could be revoked for "public"
pg_restore: WARNING:  no privileges could be revoked for "public"
pg_restore: WARNING:  no privileges were granted for "public"
pg_restore: WARNING:  no privileges were granted for "public"
WARNING: errors ignored on restore: 1

我不知道这意味着什么？我如何备份和恢复PostgreSQL数据库？

非常感谢。

------------------------ update 1 --------------------- ---

即使我添加了＃34; - 没有所有者＆＃34;使用pg_dump和pg_restore的选项，我仍然得到相同的错误消息：

gid:~/works $ pg_restore -U db_name_user -O -Ft -d db_name db_name.tar 
pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 3621; 0 0 COMMENT EXTENSION plpgsql 
pg_restore: [archiver (db)] could not execute query: ERROR:  must be owner of extension plpgsql
    Command was: COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';  

pg_restore: WARNING:  no privileges could be revoked for "public"
pg_restore: WARNING:  no privileges could be revoked for "public"
pg_restore: WARNING:  no privileges were granted for "public"
pg_restore: WARNING:  no privileges were granted for "public"
WARNING: errors ignored on restore: 1

Answer 1

您可以忽略评论语言时出错 - 它不会影响您的代码。还要考虑不使用所有者来避免此类警告。但请记住，所有者将是您在pg_restore上连接的用户，而不是原始用户。请阅读文档： https://www.postgresql.org/docs/current/static/app-pgrestore.html：

-O

- no-owner 不输出命令来设置对象的所有权以匹配原始数据库。默认情况下，pg_restore会发出ALTER OWNER或   SET SESSION AUTHORIZATION语句用于设置已创建的所有权   架构元素。除非是最初的，否则这些陈述将失败   与超级用户（或同一用户）建立数据库连接   拥有脚本中的所有对象）。使用-O，任何用户名   可用于初始连接，此用户将拥有所有   创造了对象。

如何备份和恢复一个PostgreSQL数据库？

1 个答案: