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13.6.2.2 `LOAD DATA FROM MASTER' Syntax
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LOAD DATA FROM MASTER
Takes a snapshot of the master and copies it to the slave. It updates
the values of `MASTER_LOG_FILE' and `MASTER_LOG_POS' so that the slave
will start replicating from the correct position. Any table and database
exclusion rules specified with the `--replicate-*-do-*' and
`--replicate-*-ignore-*' options are honored. `--replicate-rewrite-db'
is _not_ taken into account (because one user could, with this option,
set up a non-unique mapping such as `--replicate-rewrite-db=db1->db3'
and `--replicate-rewrite-db=db2->db3', which would confuse the slave
when it loads the master's tables).
Use of this statement is subject to the following conditions:
* It works only with `MyISAM' tables.
* It acquires a global read lock on the master while taking the
snapshot, which prevents updates on the master during the load
operation.
In the future, it is planned to make this statement work with `InnoDB'
tables and to remove the need for a global read lock by using
non-blocking online backup.
If you are loading big tables, you might have to increase the values of
`net_read_timeout' and `net_write_timeout' on both your master and
slave servers. Server system variables.
Note that `LOAD DATA FROM MASTER' does _not_ copy any tables from the
`mysql' database. This makes it easy to have different users and
privileges on the master and the slave.
The `LOAD DATA FROM MASTER' statement requires the replication account
that is used to connect to the master to have the `RELOAD' and `SUPER'
privileges on the master and the `SELECT' privilege for all master
tables you want to load. All master tables for which the user does not
have the `SELECT' privilege are ignored by `LOAD DATA FROM MASTER'.
This is because the master will hide them from the user: `LOAD DATA
FROM MASTER' calls `SHOW DATABASES' to know the master databases to
load, but `SHOW DATABASES' returns only databases for which the user has
some privilege. See `SHOW DATABASES' SHOW DATABASES. On the
slave's side, the user that issues `LOAD DATA FROM MASTER' should have
grants to drop and create the databases and tables that are copied.
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