openGauss每日一练第20天 | 学习心得体会

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:~$ mkdir /var/lib/opengauss/backup
omm@modb:~$ ls
omm@modb:~$ dir
omm@modb:~$ ls -al
total 20
drwxr-xr-x 2 omm  omm  4096 Aug 25 12:29 .
drwxr-xr-x 1 root root 4096 Aug 25 12:29 ..
-rw-r--r-- 1 omm  omm   220 Apr 18  2019 .bash_logout
-rw-r--r-- 1 omm  omm  3691 Aug 25 12:29 .bashrc
-rw-r--r-- 1 omm  omm   807 Apr 18  2019 .profile
omm@modb:~$ ls /var/lib/opengauss/backup
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  test IDENTIFIED BY 'huawei@1234' sysadmin ;
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# CREATE TABLESPACE test_tbs RELATIVE LOCATION 'tablespace/test_tbs1';
CREATE TABLESPACE
omm=# CREATE DATABASE testdb WITH TABLESPACE = test_tbs;
CREATE DATABASE
omm=# CREATE TABLE test1(col int);
CREATE TABLE
omm=# CREATE TABLE test2(col int);
CREATE TABLE
omm=# \q
omm@modb:~$ gsql -d omm    -c "\dt"
                         List of relations
 Schema | Name  | Type  | Owner |             Storage              
--------+-------+-------+-------+----------------------------------
 public | test1 | table | omm   | {orientation=row,compression=no}
 public | test2 | table | omm   | {orientation=row,compression=no}
(2 rows)

gs_dump[port='5432'][omm][2022-12-13 21:23:04]: The total objects number is 413.
gs_dump[port='5432'][omm][2022-12-13 21:23:04]: [100.00%] 413 objects have been dumped.
gs_dump[port='5432'][omm][2022-12-13 21:23:04]: dump database omm successfully
gs_dump[port='5432'][omm][2022-12-13 21:23:04]: total time: 1603  ms
omm@modb:~$ gsql -d testdb   -U test  -W huawei@1234  -f /var/lib/opengauss/backup/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: 17  ms
omm@modb:~$ gsql -d omm    -c "\dt"
                         List of relations
 Schema | Name  | Type  | Owner |             Storage              
--------+-------+-------+-------+----------------------------------
 public | test1 | table | omm   | {orientation=row,compression=no}
 public | test2 | table | omm   | {orientation=row,compression=no}
(2 rows)

omm@modb:~$ gsql -d testdb   -U test   -W huawei@1234 -c "\dt"
                         List of relations
 Schema | Name  | Type  | Owner |             Storage              
--------+-------+-------+-------+----------------------------------
 public | test1 | table | omm   | {orientation=row,compression=no}
 public | test2 | 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

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 test3(col int);
CREATE TABLE
omm=#   CREATE TABLE test4(col int);
CREATE TABLE
omm=# \q
omm@modb:~$ gs_dump -U test -W huawei@1234  omm -F p -f /var/lib/opengauss/backup/backup.dump
gs_dump[port='5432'][omm][2022-12-13 21:26:45]: The total objects number is 417.
gs_dump[port='5432'][omm][2022-12-13 21:26:45]: [100.00%] 417 objects have been dumped.
gs_dump[port='5432'][omm][2022-12-13 21:26:45]: dump database omm successfully
gs_dump[port='5432'][omm][2022-12-13 21:26:45]: total time: 1508  ms
omm@modb:~$ gsql -d testdb   -U test  -W huawei@1234  -f /var/lib/opengauss/backup/backup.dump
SET
SET
SET
SET
SET
SET
gsql:/var/lib/opengauss/backup/backup.dump:16: ERROR:  schema "test" already exists
ALTER SCHEMA
SET
SET
SET
gsql:/var/lib/opengauss/backup/backup.dump:34: ERROR:  relation "test1" already exists in schema "public"
DETAIL:  creating new table with existing name in the same schema
ALTER TABLE
gsql:/var/lib/opengauss/backup/backup.dump:46: ERROR:  relation "test2" 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: 23  ms
omm@modb:~$ gsql -d omm    -c "\dt"
                         List of relations
 Schema | Name  | Type  | Owner |             Storage              
--------+-------+-------+-------+----------------------------------
 public | test1 | table | omm   | {orientation=row,compression=no}
 public | test2 | table | omm   | {orientation=row,compression=no}
 public | test3 | table | omm   | {orientation=row,compression=no}
 public | test4 | table | omm   | {orientation=row,compression=no}
(4 rows)

omm@modb:~$ gsql -d testdb   -U test   -W huawei@1234 -c "\dt"
                         List of relations
 Schema | Name  | Type  | Owner |             Storage              
--------+-------+-------+-------+----------------------------------
 public | test1 | table | omm   | {orientation=row,compression=no}
 public | test2 | table | omm   | {orientation=row,compression=no}
 public | test3 | table | omm   | {orientation=row,compression=no}
 public | test4 | table | omm   | {orientation=row,compression=no}
(4 rows)