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MySQL backup to file, gzip and load in one step

When a MySQL Slave is set-up with mysqldump you have 2 possibilities:

  • You dump into a file and then load the data into the Slave with the mysql client utility.
  • You dump directly into the mysql client utility.

The first possibility has the advantage that you can start the load again if it failed. You can look into the file (and do some changes if needed).
The second possibility has the advantage that you do not need disk space and that it is possibly faster. But when the load fails you have to start from the very beginning.

What I was looking for is a way to combine everything in one step: Dumping to a file including compression and in the same step load the database to a slave. This is what I found to solve these requirements:

mysqldump --user=root --all-databases --flush-privileges --single-transaction --master-data=1 --quick \
--flush-logs --triggers --routines --events | tee >(gzip > /tmp/full_backup.sql.gz) | mysql --user=root --host= --port 3306

With this command you can even load several CPUs of the system:

24747 mysql     20   0  534m  56m 5504 S 36.1  0.7   4:12.35 mysqld
 4967 mysql     20   0  402m  33m 5236 S  7.0  0.4   0:02.06 mysqld
 4982 mysql     20   0 23348 2112 1216 S  6.6  0.0   0:01.64 mysqldump
 4984 mysql     20   0 28608 3856 1372 S  5.6  0.0   0:01.58 mysql
 4986 mysql     20   0  4296  688  304 S  5.3  0.0   0:02.10 gzip
 4983 mysql     20   0 98.5m  628  544 S  0.7  0.0   0:00.13 tee

If gzip becomes the bottleneck you can try with pigz.

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