Merge work:/home/bk/mysql-4.0 into hundin.mysql.fi:/my/bk/mysql-4.0

MySQL uses memory mapping (@code{mmap()}) on compressed tables and

falls back to normal read/write file usage if @code{mmap()} doesn't work.

There are currently two limitations with @code{myisampack}:

Please note the following:

@itemize @bullet

@item

After packing, the table is read-only.

After packing, the table is read-only. This is generally intended

(such as when accessing packed tables on a CD). Also allowing writes

to a packed table is on our TODO list but with low priority.

@item

@code{myisampack} can also pack @code{BLOB} or @code{TEXT} columns. The

older @code{pack_isam} could not do this.

@code{myisampack} can also pack @code{BLOB} or @code{TEXT} columns.

The older @code{pack_isam} (for @code{ISAM} tables) can not do this.

@end itemize

Fixing these limitations is on our TODO list but with low priority.

@code{myisampack} is invoked like this:

@example