Article directory
foreword
I encountered database migration operations at work, but using the traditional navicate data connection tool may cause a series of problems, such as data loss, so I use mysql and pgsql commands to do the migration in combination with my personal situation. Mysql or pgsql must be arranged before use.
1. How does mysql do backup?
1.1, backup a database
mysqldump -u用户名 -p密码 数据库名 > 导出的文件名
例如：
mysqldump -hhostname -uroot -ppwd dataname >dataname.sql
1.2, back up all databases
mysqldump -h *.*.*.* -p -u username -p password --all-databases > /data/backup/mysql_db.sql
1.3, backup a table
For example:
mysqldump -hhostname -uroot -ppwd dataname specific_tabname1 specific_tabname2> dataname_specific_tabname.sql
1.4, backup multiple databases
mysqldump -hhostname -uusername -ppwd --databases dbname1 dbname2 dbname3 > multibackupfile.sql
1.5. Export a database structure
mysqldump -hhostname -uroot -ppwd -–add-drop-table --no-data dataname > dataname_nodata.sql
--no-data: no data
--add-drop-table Add a drop table command before each create statement
1.6. Backup compression
2. Backup compression
Format: mysqldump -h host IP -P port -u user name -p password --database database name | gzip > file name
. compression
mysqldump -h *.*.*.* -p -u username -p password --database mysql | gzip > /data/backup/mysql.sql.gz
Two, mysql restore backup
2.1. Command to restore MySQL database
#database is the database name
mysql -h ... -u username -p password database < backupfile.sql
2.2. Restore the compressed MySQL database
database is the database name
gunzip < backupfile.sql.gz | mysql -u username -p password database
2.3. Transfer the database to the new server
database is the database name
mysqldump -u username -p password database | mysql –host=*.*.*.* -C database
2.4. Import database
The source command is commonly used, use use to enter a certain database, mysql>source d:\test.sql, and the following parameters are script files.
3. How to make pgsql backup
Backup on linux system (here introduces the work of migrating a single database to another server)
-h connect database ip address
-p database port
-U database user
-c clear database object before recreating
-d specify database
-f specify backup to local file path
pg_dump -h 120.55.163.126 -p 5432 -U postgres -c -d homestead_pengze_prod -f
/ws/db-bak/homestead_pengze_prod.bak
提示：window安装的话进入pgsql的bin目录使用cmd目录执行命令
Migration:
Copy the backup file to the destination server directory (such as /ws), create a database with the same name on another server, use docker to install pgsql on the destination server, and first copy the backup script
to the container
docker cp homestead_pengze_prod.bak postgresql:/
Enter the container and execute the following restore backup script
docker exec -it postgresql /bin/sh
Four, pgsql restore backup
Restore script:
-d database to restore
-f backup file
psql -h 127.0.0.1 -p 5432 -U postgres -d homestead_pengze_prod -f
homestead_pengze_prod.bak