You can backup a single MySQL database using the following syntax: mysqldump -v -u Username pPassword Databasename > Dumpfile.sqlMysqldump is a client utility that is used to perform logical backups of the MySQL database. This utility will help you to backup a local or remote MySQL database into a single file. You can backup and restore the MySQL database using the mysqldump utility. Backup a Single MySQL Database.
Click Manage on the database you want to access. Dashboard In the left pane, click MySQL Management. Step 1: Create your new databaseBackup a MySQL database Log in to your Hosting Dashboard. Restore your database backup to this new database using one of several possible commands. The process to restore a MySQL database from a backup file created by mysqldump is a simple two-step process: Create a new MySQL database using the mysqladmin utility (or mysql command).
Migrating data across different managed MySQL service providers.docker exec CONTAINER /usr/bin/mysqldump -u root -passwordroot DATABASE > backup.sql. Make sure that the exact path for the dump file which is. On the host machine, databasename can be in a root directory, so it may not be necessary to add the path. Make sure to include databasename and filename in the path. To restore a MySQL backup, enter: mysql -u user -p databasename < filename.sql.
Mysql Restore Backup How To Handle Import
In the first part, we focus on the prerequisites you need to take care while importing the MySQL table data and in the second part, we will talk about how to handle import for stored program objects and views.First off, it’s important to ensure that your destination database volume has sufficient space to hold the imported data. This is why it’s important to plan well before you take up the dump and restore activity.In this 2-part blog series, we discuss some of the common aspects you should handle upfront to ensure a successful dump and restore activity. The process might even turn cumbersome if you encounter errors during either dump or restore as it may lead you to fix the issues and re-run the operations. Since this model uses reading of the whole database and then essentially rebuilding, both dump and restore are time-consuming operations for a large database. By replaying these statements on the destination database server, the original data is reconstructed. Migrating data between different versions of MySQL.Mysqldump works by reading the source database objects and generating a set of SQL statements that are stored in a dump file.
Sql_modeSql_mode settings for MySQL server determine the SQL statement syntax and data validation checks that the server performs for the operations. Without these precautions, you may see your dump or restore failing due to insufficient space after running for a long time which is a loss of your productive time and effort. In such cases, it’s a good idea to plan the destination size greater than twice the size of the source database.It is also important to ensure sufficient space is available on the volume where you generate the mysqldump output file. Binary logs are needed if you want to restore your data on one server and want that to be replicated.
This is a problem since mysqldump utility dumps the tables in alphabetical order. Whenever a table with foregin key constraint is created, MySQL expects that the parent table which is referred to by the foregin key already exists. For big tables, this saves a lot of disk I/O because InnoDB can use its change buffer to write secondary index records in a batch.If you have FOREIGN KEY constraints in your tables, you can speed up table restore operation by turning off the foreign key checks for the duration of the restore session: For big tables, this can save a lot of disk I/O.Disabling FOREIGN_KEY_CHECKS will also help to avoid errors due to foregin key constraint checks during the restore operation. Unique_checks and foreign_key_checksBy default (if you don’t use –compact option), mysqldump also sets the following:As explained here, you can speed up restore operation by temporarily turning off the uniqueness checks during the session. Let’s demonstrate this with an example.Say you have a table on your source which has a date column having entries as zero dates:+-+-Suppose the strict sql_mode (and NO_ZERO_DATE) is disabled on source, but enabled on the destination – restoring such rows will result in failure such as:ERROR 1292 (22007) at line 40: Incorrect date value: '' for column 'ts’' at row 2You will typically see such issues if you are taking a compact dump by enabling the compact option as part of your mysqldump.If compact is disabled (which is by default) then you will not face this issue as mysqldump generates following conditional statement as part of the dump:This means that during the restore sql_mode is set to 'NO_AUTO_VALUE_ON_ZERO' before restoring the table data so restore goes through fine.Best practice for mysqldump: Part 1 - MySQL Prerequisites Click To Tweet 3.
Privileges required for running mysqldumpThe minimum privilege required by mysqldump for dumping a database is SELECT on that database.However, if your database has views, you will need SHOW VIEW permissions as well, as mysqldump always dumps views along with the tables of the database. When this is replayed at the time of restore, it will fail with the error:ERROR 1215 (HY000) at line 50: Cannot add foreign key constraint -Which happens while executing the create table statement for ‘ref_table’.In summary, be aware of the issues you may encounter, if you specify -compact option while running mysqldump. Based on the alphabetical order, mysqldump first dumps the contents of ref_table.
This is also an important setting that can be checked and set appropriately upfront, rather than facing the errors at a later time.In this first part of the mysqldump series, we discussed prerequisites for a successful dump and restore operation for large MySQL databases in order to help you avoid multiple attempts and unproductive time spent.In the next part, we will discuss best practices to import the stored programs and views from your MySQL database.
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