openGauss每日一练第 20 天 | 逻辑备份与恢复

学习目标
掌握openGauss数据库的逻辑备份和恢复技术。

课程作业
1.逻辑备份和恢复案例1:使用sql格式进行备份和恢复omm数据库

root@modb:~# su - omm
omm@modb:~$ pwd            
/home/omm
omm@modb:~$ mkdir bk
omm@modb:~$ gsql -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# create user dhr identified by 'dhr@1234' sysadmin;
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# create tablespace testtbs relative location 'tablespace/tbs';
CREATE TABLESPACE
omm=# create database testdb with tablespace=testtbs;
omm=# CREATE DATABASE
omm=# 
create table t1(id int);
CREATE TABLE
omm=# create table t2(id int);
CREATE TABLE
omm=# \dt
                        List of relations
 Schema | Name | Type  | Owner |             Storage              
--------+------+-------+-------+----------------------------------
 public | t1   | table | omm   | {orientation=row,compression=no}
 public | t2   | table | omm   | {orientation=row,compression=no}
(2 rows)


omm@modb:~$ gs_dump -U dhr -W dhr@1234 omm -F p -f /home/omm/bk/backup.sql
gs_dump[port='5432'][omm][2022-12-13 11:13:30]: The total objects number is 413.
gs_dump[port='5432'][omm][2022-12-13 11:13:30]: [100.00%] 413 objects have been dumped.
gs_dump[port='5432'][omm][2022-12-13 11:13:30]: dump database omm successfully
gs_dump[port='5432'][omm][2022-12-13 11:13:30]: total time: 1724  ms

omm@modb:~$ gsql -d testdb -U dhr -W dhr@1234 -f /home/omm/bk/backup.sql
SET
SET
SET
SET
SET
SET
CREATE SCHEMA
ALTER SCHEMA
SET
SET
SET
CREATE TABLE
ALTER TABLE
CREATE TABLE
ALTER TABLE
REVOKE
REVOKE
GRANT
GRANT
total time: 20  ms

omm@modb:~$ gsql -d omm -c "\dt"
                        List of relations
 Schema | Name | Type  | Owner |             Storage              
--------+------+-------+-------+----------------------------------
 public | t1   | table | omm   | {orientation=row,compression=no}
 public | t2   | table | omm   | {orientation=row,compression=no}
(2 rows)

omm@modb:~$ gsql -d testdb -U dhr -W dhr@1234 -c "\dt"
                        List of relations
 Schema | Name | Type  | Owner |             Storage              
--------+------+-------+-------+----------------------------------
 public | t1   | table | omm   | {orientation=row,compression=no}
 public | t2   | table | omm   | {orientation=row,compression=no}
(2 rows)

2.逻辑备份和恢复案例2:使用dump格式进行备份和恢复omm数据库

omm@modb:~$ gsql -r 
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# create table t3(id int);
CREATE TABLE
omm=# create table t4(id int);
CREATE TABLE
omm=# \q

omm@modb:~$ gs_dump -U dhr -W dhr@1234 omm -F p -f /home/omm/bk/bk.dump
gs_dump[port='5432'][omm][2022-12-13 11:18:16]: The total objects number is 417.
gs_dump[port='5432'][omm][2022-12-13 11:18:16]: [100.00%] 417 objects have been dumped.
gs_dump[port='5432'][omm][2022-12-13 11:18:16]: dump database omm successfully
gs_dump[port='5432'][omm][2022-12-13 11:18:16]: total time: 1575  ms
omm@modb:~$ gsql -d testdb -U dhr -W dhr@1234 -f /home/omm/bk/bk.dump
SET
SET
SET
SET
SET
SET
gsql:/home/omm/bk/bk.dump:16: ERROR:  schema "dhr" already exists
ALTER SCHEMA
SET
SET
SET
gsql:/home/omm/bk/bk.dump:34: ERROR:  relation "t1" already exists in schema "public"
DETAIL:  creating new table with existing name in the same schema
ALTER TABLE
gsql:/home/omm/bk/bk.dump:46: ERROR:  relation "t2" already exists in schema "public"
DETAIL:  creating new table with existing name in the same schema
ALTER TABLE
CREATE TABLE
ALTER TABLE
CREATE TABLE
ALTER TABLE
REVOKE
REVOKE
GRANT
GRANT
total time: 21  ms

omm@modb:~$ gsql -d testdb -U dhr -W dhr@1234 -c "\dt"
                        List of relations
 Schema | Name | Type  | Owner |             Storage              
--------+------+-------+-------+----------------------------------
 public | t1   | table | omm   | {orientation=row,compression=no}
 public | t2   | table | omm   | {orientation=row,compression=no}
 public | t3   | table | omm   | {orientation=row,compression=no}
 public | t4   | table | omm   | {orientation=row,compression=no}
(4 rows)