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On Unix, the way to symlink a database is to first create a directory on some disk where you have free space and then create a symlink to it from the MySQL database directory.
shell> mkdir /dr1/databases/test shell> ln -s /dr1/databases/test mysqld-datadir |
MySQL doesn't support that you link one directory to multiple
databases. Replacing a database directory with a symbolic link will
work fine as long as you don't make a symbolic link between databases.
Suppose you have a database db1
under the MySQL data
directory, and then make a symlink db2
that points to db1
:
shell> cd /path/to/datadir shell> ln -s db1 db2 |
Now, for any table tbl_a
in db1
, there also appears to be
a table tbl_a
in db2
. If one thread updates db1.tbl_a
and another thread updates db2.tbl_a
, there will be problems.
If you really need this, you must change the following code in `mysys/mf_format.c':
if (flag & 32 || (!lstat(to,&stat_buff) && S_ISLNK(stat_buff.st_mode))) |
to
if (1) |
On Windows you can use internal symbolic links to directories by compiling
MySQL with -DUSE_SYMDIR
. This allows you to put different
databases on different disks. See section 7.6.1.3 Using Symbolic Links for Databases on Windows.