How To Use Mysqldump

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Part 1 of 2: If you have used MySQL for a while, you have probably used to backup your database. In part one of this blog, I am going to show you how to create a simple full and partial backup using. In, I will show you how to use (which is the successor to the InnoDB Hot Backup product). MySQL Enterprise Backup allows you to backup your database while it is online and it keeps the database available to users during backup operations (you don’t have to take the database offline or lock any databases/tables – but to do this, you need to use the –no-locking option).This post will deal with. For those of you that aren’t familiar with:The mysqldump client is a utility that performs logical backups, producing a set of SQL statements that can be run to reproduce the original schema objects, table data, or both. It dumps one or more MySQL database for backup or transfer to another SQL server.

Mysqldump is an effective tool to backup MySQL database. It creates a.sql file with DROP table, CREATE table and INSERT into sql-statements of the source database. To restore the database, execute the.sql file on destination database. For MyISAM, use mysqlhotcopy method that we explained. Backup MySQL or MariaDB Server with a single Command-Line using mysqldump How to perform a full backup of a MySQL or MariaDB Server instance on a Windows or Linux machine with single command-line. Summary: in this tutorial, you will learn how to use mysqldump tool back up MySQL databases. MySQL GUI tools such as phpMyAdmin, SQLyog and etc, often provide features for backup MySQL databases with ease.

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The mysqldump command can also generate output in CSV, other delimited text, or XML format.The best feature about is that it is easy to use. The main problem with using occurs when you need to restore a database. When you execute, the database backup (output) is an SQL file that contains all of the necessary SQL statements to restore the database – but restoring requires that you execute these SQL statements to essentially rebuild the database. Since you are recreating your database, the tables and all of your data from this file, the restoration procedure can take a long time to execute if you have a very large database.There are a lot of features and options with –. I won’t review all of the features, but I will explain some of the ones that I use.Here is the command to use to simply backup all of your databases (assuming you have InnoDB tables).

This command will create a dump (backup) file named alldatabases.sql. Warning: A partial dump from a server that has GTIDs will by default include the GTIDs of all transactions, even those that changed suppressed parts of the database. If you don' t want to restore GTIDs, pass - set - gtid - purged = OFF. To make a complete dump, pass - all - databases - triggers - routines - events.You can also execute a of all of your databases. This example will be a because I am not going to backup the default databases for MySQL (which are created during installation) – mysql, test, PERFORMANCESCHEMA and INFORMATIONSCHEMANote: does not dump the INFORMATIONSCHEMA database by default. To dump INFORMATIONSCHEMA, name it explicitly on the command line and also use the option.never dumps the performanceschema database.also does not dump the MySQL Cluster information database.Before MySQL 5.6.6, does not dump the generallog or slowquerylog tables for dumps of the mysql database.

As of 5.6.6, the dump includes statements to recreate those tables so that they are not missing after reloading the dump file. Log table contents are not dumped.If you encounter problems backing up views due to insufficient privileges, see for a workaround.(from: )To do a partial backup, you will need a list of the databases that you want to backup. You may retrieve a list of all of the databases by simply executing the SHOW DATABASES command from a mysql prompt. Databases - This allows you to specify the databases that you want to backup. You can also specify certain tables that you want to backup.

If you want to do a full backup of all of the databases, then leave out this option-add-drop-database - This will insert a DROP DATABASE statement before each CREATE DATABASE statement. This is useful if you need to import the data to an existing MySQL instance where you want to overwrite the existing data. You can also use this to import your backup onto a new MySQL instance, and it will create the databases and tables for you.-triggers - this will include the triggers for each dumped table-routines - this will include the stored routines (procedures and functions) from the dumped databases-events - this will include any events from the dumped databases-set-gtid-purged=OFF - since I am using replication on this database (it is the master), I like to include this in case I want to create a new slave using the data that I have dumped. This option enables control over global transaction identifiers (GTID) information written to the dump file, by indicating whether to add a SET @@global.gtidpurged statement to the output.-user - The MySQL user name you want to use-password - Again, you can add the actual value of the password (ex.password=mypassword), but it is less secure than typing in the password manually. This is useful for when you want to put the backup in a script, in cron or in Windows Task Scheduler.-single-transaction - Since I am using InnoDB tables, I will want to use this option. Mysqldump - databases comicbookdb coupons scripts watchdb - single - transaction - set - gtid - purged = OFF - add - drop - database - triggers - routines - events - user = root - password partialdatabasebackup. SqlI will need to enter my password on the command line.

After the backup has completed, if your backup file isn’t too large, you can open it and see the actual SQL statements that will be used if you decide that you need to recreate the database(s). If you accidentally dump all of the databases into one file, and you want to separate the dump file into smaller files,.For example, here is the section of the dump file ( partialdatabasebackup.db) for the comicbookdb database (without the table definitions). (I omitted the headers from the dump file.). Current Database: `comicbookdb`-/.!40000 DROP DATABASE IF EXISTS `comicbookdb`./;CREATE DATABASE /.!32312 IF NOT EXISTS./ `comicbookdb` /.!40100 DEFAULT CHARACTER SET latin1./;USE `comicbookdb`;- Table structure for table `comics`-DROP TABLE IF EXISTS `comics`;/.!40101 SET @savedcsclient = @@charactersetclient./;/.!40101 SET charactersetclient = utf8./;CREATE TABLE `comics` (`serialid` int(7) NOT NULL AUTOINCREMENT,`datetimeadded` datetime NOT NULL,`publisherid` int(6) NOT NULL. SET @ @ GLOBAL.

GTIDPURGED = '82F20158-5A16-11E2-88F9-C4A801092ABB:1-168523';You may also test your backup without exporting any data by using the –no-data option. This will show you all of the information for creating the databases and tables, but it will not export any data. This is also useful for recreating a blank database on the same or on another server.When you export your data, will create INSERT INTO statements to import the data into the tables. However, the default is for the INSERT INTO statements to contain multiple-row INSERT syntax that includes several VALUES lists.

This allows for a quicker import of the data. But, if you think that your data might be corrupt, and you want to be able to isolate a given row of data – or if you simply want to have one INSERT INTO statement per row of data, then you can use the –skip-extended-insert option. If you use the –skip-extended-insert option, importing the data will take much longer to complete, and the backup file size will be larger.Importing and restoring the data is easy.

To import the backup file into a new, blank instance of MySQL, you can simply use the mysql command to import the data. Mysql - uroot - p mysqldump.

How To Use Mysqldump Linux

The main thing to remember is that you should backup your data on a regular basis, and move a copy of the backup file off the MySQL server.Finally, here is a Perl script that I use in cron to backup my databases. This script allows you to specify which databases you want to backup via the mysqlbak.config file. This config file is simply a list of the databases that you want to backup, with an option to ignore any databases that are commented out with a #. This isn’t a secure script, as you have to embed the MySQL user password in the script. Hi,When I restore a database which is 47 GB in size, the recovered database is only 36 GB. I am creating a new database and running tools to recover the database on this new database.DBA has confirmed that all data is restored. They have counted tables and records and have even compared a few reports from Live database & recovered database.Where is this gap?What I understand is that the new recovered database is a clean fresh db and has no whitespaces so the recovered database is smaller than the live database.

How To Use Mysqldump In Xampp

I just want to authenticate my understanding and any other reasons for this behavior.Regards,Anuj.