PostgreSQL单个表误删除进行恢复

最后编辑时间：2022年1月23日00:09:24

恢复步骤：
1）首先找到最近的备份文件（日常备份必不可少）
2）创建一个新的数据库，并用备份文件进行恢复
3）在新的数据库中将目标表的数据进行导出
4）将该表数据进行恢复
以下为测试示例：

[postgres@rhel6wcb ~]$ pg_dump -h 127.0.0.1 -p 5432 -d test -Fc -f pg_dump.dmp
[postgres@rhel6wcb ~]$ ls -lth
total 35M
-rw-rw-r-- 1 postgres postgres 35M Dec  2 22:23 pg_dump.dmp
[postgres@rhel6wcb ~]$ psql
psql (11.7)
Type "help" for help.
postgres@postgres=>\c test
You are now connected to database "test" as user "postgres".
postgres@test=>\dt+ test_big1
                      List of relations
 Schema |   Name    | Type  |  Owner   |  Size  | Description 
--------+-----------+-------+----------+--------+-------------
 public | test_big1 | table | postgres | 280 MB | 
(1 row)
postgres@test=>select count(*) from test_big1;
  count  
---------
 5000000
(1 row)
postgres@test=>drop table test_big1;
DROP TABLE


postgres@postgres=>create database test2;
CREATE DATABASE
[postgres@rhel6wcb ~]$ pg_restore -h 127.0.0.1 -p 5432 -d test2 pg_dump.dmp
[postgres@rhel6wcb ~]$ psql
psql (11.7)
Type "help" for help.

postgres@postgres=>\c test2
You are now connected to database "test2" as user "postgres".
postgres@test2=>\dt+ test_big1;
                      List of relations
 Schema |   Name    | Type  |  Owner   |  Size  | Description 
--------+-----------+-------+----------+--------+-------------
 public | test_big1 | table | postgres | 280 MB | 
(1 row)
[postgres@rhel6wcb ~]$ pg_dump -h 127.0.0.1 -p 5432 -d test2 -t test_big1 -Fp -f test_big1.sql
[postgres@rhel6wcb ~]$ ls -lht
total 261M
-rw-rw-r-- 1 postgres postgres 227M Dec  2 22:27 test_big1.sql
-rw-rw-r-- 1 postgres postgres  35M Dec  2 22:23 pg_dump.dmp
[postgres@rhel6wcb ~]$ psql test <test_big1.sql
SET
SET
SET
SET
SET
 set_config 
------------
 
(1 row)

SET
SET
SET
SET
SET
SET
CREATE TABLE
ALTER TABLE
COPY 5000000
CREATE INDEX
[postgres@rhel6wcb ~]$ psql
psql (11.7)
Type "help" for help.

postgres@postgres=>\c test
You are now connected to database "test" as user "postgres".
postgres@test=>\dt+ test_big1;
                      List of relations
 Schema |   Name    | Type  |  Owner   |  Size  | Description 
--------+-----------+-------+----------+--------+-------------
 public | test_big1 | table | postgres | 280 MB | 
(1 row)
postgres@test=>select count(*) from test_big1;
  count  
---------
 5000000
(1 row)

到此误删除的表的数据已经恢复。