Backup recovery strategies using mysqldump and binary login
Other third-party solutions may be available. Symptoms of corrupted tables include queries that abort unexpectedly and observable errors such as these:. For example, you would use commands something like these:. To avoid problems like this, use a single connection to execute the contents of all binary logs that you want to process.
The backup driver for the snapshot engine works with only those storage engines that support consistent read via the handler interface, which currently includes only InnoDB and Falcon. Alternatively, you can omit --databases from the mysqldump command. During backup, clients might be able to read data while it is being backed up. See Chapter 16, Replication. In this case, you should at least make a backup of the table before running myisamchk.
This improves join performance by enabling the join optimizer to better choose the order in which to join the tables and which indexes it should use. Other table-repair information can be found at Section 2. This is also useful for testing downgrades. This can be done like so:.
One advantage of these statements over myisamchk is that the server does all the work. If the database to be reloaded does not exist, you must create it first. In the single-database case, it is allowable to omit the --databases option:. The -s option short for --silent causes myisamchk to run in silent mode, printing messages only when errors occur.
To dump only specific tables from a database, name them on the command line following the database name:. The rows are not removed from the table by the server. The mysqldump program and the mysqlhotcopy script can make backups. Changes made by other clients to InnoDB tables are not seen by the mysqldump process.
This number is the ID for the corresponding row or rows in the metadata tables described later. For reloading, you can specify a database name different from the backup recovery strategies using mysqldump and binary login name, which enables you to reload the data into a different database. Using myisamchk for Crash Recovery. The table name is the basename for these files. In this case, if the server tries to update a table that myisamchk is using, the server will wait for myisamchk to finish before it continues.
One advantage of these statements over myisamchk is that the server does all the work. To avoid this problem, follow the guidelines in Section 4. This enables recovery of data changes for a given span of time. This section surveys techniques that enable you to use mysqldump to solve specific problems:. Then it is necessary to recover our MySQL data from backups, which means that backups must already have been made.
To restore logical backups, SQL-format dump files can be processed using the mysql client. After editing the file, execute the contents as follows:. The backup is done by querying the MySQL server to obtain database structure and content information.
The example commands do not include options such as --user and --password for the mysqldump and mysql client programs. Then you will need to create the database on Server 2 if necessary and specify it as the default database when you reload the dump file. To dump all databases, invoke mysqldump with the --all-databases option:. If the data file contains everything that it should and the delete links point at the correct locations within the data file, this should work, and the table is fixed.