What is dumping a database?
Database dump is a text file containing a set of SQL statements that need to be run on an SQL server to create a database with the entire internal structure and fill it up with values. Generally, a database dump can be used for several purposes: Backup – to restore data in case of a disaster.
Does Mysqldump affect performance?
Using default mysqldump it quickly spirals the server load out of control and locks up everything… affecting my users. Trying to stop the process can lead to crashed tables and lots of downtime during recovery of those tables. The mysqldump reference at dev.mysql.com even says…
What is Mysqldump command?
Mysqldump is a command-line utility that is used to generate the logical backup of the MySQL database. It produces the SQL Statements that can be used to recreate the database objects and data. The command can also be used to generate the output in the XML, delimited text, or CSV format.
What is Mysqlpump?
The mysqlpump client utility performs logical backups, producing a set of SQL statements that can be executed to reproduce the original database object definitions and table data. It dumps one or more MySQL databases for backup or transfer to another SQL server.
How does SQL dump work?
mysqldump produces an SQL representation of the data for one or more tables or databases. The two main use cases for dumping SQL are: Backing up the database data. The SQL can be read in (“played back”) to an empty database server and it will re-create the tables and populate them with rows.
Where is Mysqldump stored?
The mysqldump tool is located in the root/bin directory of the MySQL installation directory.
Should I stop MySQL before Mysqldump?
5 Answers. No, ytou don’t have to take down the web site to do a MySQL backup. You not only can use mysqldump on a running MySQL database but in fact the server must be running for mysqldump to be able to connect to it.
Is Mysqldump safe?
MySQL’s unencrypted port is not secure. If you’re running mysqldump on your VPS host, and only transferring the resulting dump file to your PC, then you can do this securely. If you can ssh to your VPS, you should be able to use scp too. This gives you the ability to transfer files securely.
Can Mysqldump lock tables?
By default, the mysqldump utility, which allows to back a MySQL database, will perform a lock on all tables until the backup is complete. You can use the Mysqldump utility with a specific flag, –single-transaction, which will allow you to backup your database tables without locking them.
Does Mysqldump delete database?
1 Answer. By default mysqldump will output commands to drop tables, if they exist. This is why you get the error.
What is percona XtraBackup?
Percona XtraBackup is an open source tool for performing hot backups of MariaDB, MySQL and Percona Server databases. Percona XtraBackup can perform compressed, incremental and streaming backups. It was designed to back up XtraDB/InnoDB tables but can also back up other storage engines.
What is Mysqlbackup?
The mysqlbackup client is an easy-to-use tool for all backup and restore operations. During backup operations, mysqlbackup backs up: All InnoDB tables and indexes, including: Each one contains one table and its associated indexes. Each data file can use either the original Antelope or the new Barracuda file format.
How does mysqldumpslow abstract values in a query?
Normally, mysqldumpslow groups queries that are similar except for the particular values of number and string data values. It “abstracts” these values to N and ‘S’ when displaying summary output. To modify value abstracting behavior, use the -a and -n options.
What does the slow query log in MySQL mean?
The MySQL slow query log contains information about queries that take a long time to execute (see Section 5.4.5, “The Slow Query Log” ). mysqldumpslow parses MySQL slow query log files and summarizes their contents. Normally, mysqldumpslow groups queries that are similar except for the particular values of number and string data values.
Which is the Reference Manual for MySQL 5.7?
MySQL 5.7 Reference Manual / / The MySQL slow query log contains information about queries that take a long time to execute (see Section 5.4.5, “The Slow Query Log” ). mysqldumpslow parses MySQL slow query log files and summarizes their contents.