Introduction to MariaDB export database
MariaDB provides the export database functionality to the user; export database is a very good skill when a user handles the website or blog. When a database is corrupted or we need to migrate to a different server or development environment at that time we can use the export database concept to achieve our desired goal. In another situation when the user needs to restore the database , we also use the export database command. To perform export database commands we must have the root access to the database server and it is suitable to run the different commands. The export database commands are interchangeable. This is the best utility to use backup copy of server’s database by using mysqldump command.
Syntax
mysqldump -u specified user name –p specified database name > data-dump.sql
Explanation
In the above syntax we use mysqldump command to export the database here specified user name means user name that refers to the database. After that we use the specified database name for the name of the database that we need to export and in the last part of syntax contains the data-dump.sql is the file name, it will be generated along with all the database information. This command does not generate any visual output so first we need to verify the generated copy is correct or not.
How to export database in MariaDB using various ways?
Let’s see how we can export databases in MariaDB as follows.
Basically we can perform backup by using two methods as follows.
1. By using Logical Export
In logical Export we can restore data on the other hardware configuration such as DBMS or MariaDB version. The Logical export is more flexible. We can perform logical export at the level of table and database because of flexibility reasons. The size of logical export is larger as compared to the physical export and it takes more time to back and restore the database. The log files and configuration files we cannot consider for logical export.
2. By using Physical Export
In physical export we cannot restore data on other hardware configurations like DBMS or different MariaDB versions. We can perform physical export at the level of directories and files.
In a logical export database we use mysqldump command, this is more suitable or we can say that more flexible way to perform logical export and it is suitable for small databases. If database size is large then it also required large time to table export. The mysqldump exports data into the sql format as well as it also exports the data into the other format such as CSV or XML format and it can be easily imported into the other database. We are also able to dump the data into the other version of MariaDB, MySQL and another DBMS.
Logical Export of InnoDB
In InnoDB it uses the buffer pool concept to store data and index of its table in the memory. When we consider performance then buffer is very important for that purpose. The buffer contains the frequently accessed data from MariaDB server. When we perform a full table scan at that time it copies all data into the buffer pool but this is the disadvantage of logical export because every time it scans the entire table or database and it is a time consuming process, so how we can avoid this problem by using the innidb_old_blocks_time system variable. It works with milliseconds that means recently accessed data inserted into the new sub list of buffer pool and data which is accessed only ounces should remain in the old sub list of buffer pool.
- Examples
Now let’s see the different examples of export databases in MariaDB as follows.
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First we need to find out the path of MariaDB server on user machine that means location of bin folder in user machine.
Here the path of the user machine looks as follows.
C:\Program Files (x86)\MariaDB 10.5\bin
Explanation
In above path C is user systems drive and program files folder is used to store all installed software in the user machine, here we installed MariaDB 10.5 server in which we have bin folder as shown in above path.
After that we need to create a new folder on the user machine.
Now see the actual statement of the export database as follows.
mysqldump –h 127.0.0.1 root –p sample> D:\back\demo1.sql
Explanation
In the above example we use mysqldump command to export the database, in this example we have a sample database and we need to export them by using mysqldump command. In the above example we used a local host IP address; this is a by default address of the local host as shown in the above statement. After that we use root user credential to fetch the sample database. Here D is system drive and we created a new folder on D drive, name of folder is back and demo1.sql is the export database file name. In this example we exported the database name as a sample. The end output of the above query we illustrate by using the following snapshot.
Now see another way to export the database in MariaDB as follows.
mysqldump sample > samplebackup.sql
Explanation
In the above example we use mysqldump command to export the entire database. Here sample is a database name that we need to export and samplebackup.sql is sql filename for export of sample database. See here we export only a single database as shown in the above statement. The end output of the above query we illustrate by using the following snapshot.
The mysqldump provides different options to the user as follows.
- –all- database
The above option is used to dump the entire database from MariaDB server.
- –all-tablespaces
With the help of the above option we can dump all table spaces.
Conclusion
We hope from this article you have understood about the MariaDB export database. From this article we have learned the basic syntax of export databases and we also see different examples of export databases. From this article we learned how and when we use MariaDB export databases.
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