[英]Postgres drop database error: pq: cannot drop the currently open database
[英]How to restore a postgres backup - ERROR: cannot drop the currently open database
我正在尝试从不再配置的系统中恢复 postgres 备份,但我遇到了一系列错误,具体取决于我的尝试。
(我已阅读相关/建议的问题,但它们似乎不相关)
使用以下命令创建备份(在 bash 脚本中):
pg_dump --schema=public -Fc
用于恢复脚本的命令(由备份脚本作为帮助文本回显)是:
dropdb ${PGDATABASE}
createdb ${PGDATABASE}
time pg_restore \
-j4 \
-d ${PGDATABASE} \
--create \
--no-privileges \
--no-owner \
--clean \
--if-exists \
--exit-on-error \
"${dirname}/${filename}"
当我在本地运行恢复命令时,我得到以下信息:
time pg_restore -j4 -d ${PGDATABASE} --create --no-privileges --no-owner --clean --if-exists --exit-on-error ../backups/backup__2019-09-03_16-00-19.pg_dump
pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 4954; 1262 962277 DATABASE mydb mydb
pg_restore: [archiver (db)] could not execute query: ERROR: cannot drop the currently open database
Command was: DROP DATABASE IF EXISTS mydb;
real 0m0.049s
user 0m0.019s
sys 0m0.012s
以前,我只在运行几分钟后出现“磁盘空间不足错误”,但从 output time
可以看出,此错误几乎立即发生!
备份是使用压缩-Fc
创建的,我可以使用pg_restore backup.pg_dump > backup.sql
将备份解压缩为纯文本,但我无法在其中找到与DROP DATABASE
相关的任何命令:/
-- Dumped from database version 9.6.11
-- Dumped by pg_dump version 11.3 (Ubuntu 11.3-1.pgdg14.04+1)
我看到数据库最初是从9.6.11
转储的,但我有理由确定我之前使用 PG 10 成功恢复了...
我尝试了各种方法,例如:
time pg_restore -d ${PGDATABASE} --no-privileges --no-owner --exit-on-error ../backups/backup__2019-09-03_16-00-19.pg_dump
pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 7; 2615 1033373 SCHEMA public mydb
pg_restore: [archiver (db)] could not execute query: ERROR: schema "public" already exists
Command was: CREATE SCHEMA public;
ptim:dropdb mydb; createdb mydb
ptim:gizmag ptim$ dropdb mydb
ptim:gizmag ptim$ time pg_restore -d ${PGDATABASE} --create --no-privileges --no-owner --exit-on-error ../backups/backup__2019-09-03_16-00-19.pg_dump
pg_restore: [archiver (db)] connection to database "mydb" failed: FATAL: database "mydb" does not exist
# guess I misunderstood the create flag!
ptim:gizmag ptim$ dropdb mydb; createdb mydb
dropdb: database removal failed: ERROR: database "mydb" does not exist
ptim:gizmag ptim$ time pg_restore -d ${PGDATABASE} --create --no-privileges --no-owner --exit-on-error ../backups/backup__2019-09-03_16-00-19.pg_dump
pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC entry 4954; 1262 962277 DATABASE mydb mydb
pg_restore: [archiver (db)] could not execute query: ERROR: database "mydb" already exists
Command was: CREATE DATABASE mydb WITH TEMPLATE = template0 ENCODING = 'UTF8' LC_COLLATE = 'en_US.UTF-8' LC_CTYPE = 'en_US.UTF-8';
我也尝试从明文转储中恢复但未成功:
psql -U ptim -d mydb -1 -f ../backups/backup__2019-09-03_16-00-19.sql
SET
SET
SET
SET
SET
set_config
------------
(1 row)
SET
SET
SET
SET
psql:../backups/backup__2019-09-03_16-00-19.sql:23: ERROR: schema "public" already exists
psql:../backups/backup__2019-09-03_16-00-19.sql:26: ERROR: current transaction is aborted, commands ignored until end of transaction block
# snip... repeated, and varied errors follow
有什么建议么?!
感谢@a_horse_with_no_name 的提示,我了解到:
-C
,--create
在恢复之前创建数据库。 如果还指定了--clean
,则在连接到它之前删除并重新创建目标数据库。使用此选项时,以
-d
命名的数据库仅用于发出初始DROP DATABASE
和CREATE DATABASE
命令。 所有数据都恢复到存档中出现的数据库名称中。
(在dba.stackexchange 进一步解释:为什么 pg_restore 忽略 --create 。请注意, --create
在较新版本的pg_restore中具有进一步的不相关影响)
我的解决方案是删除--create
参数:
dropdb ${PGDATABASE}
createdb ${PGDATABASE}
time pg_restore \
-j4 \
-d ${PGDATABASE} \
--no-privileges \
--no-owner \
--clean \
--if-exists \
--exit-on-error \
backup.pg_dump
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