Sybase Adaptive Server, Configuration Manual

Page: 127 / 150

CHAPTER 9 Managing Adaptive Server Databases
Configuration Guide
111
In this example,
"size = 2048"
tells the command to allocate 2048 “virtual”
pages to the device. A virtual page is 2048 bytes, so this command creates a
4MB device.
The example command does not specify a device number, instead letting the
server choose one. Unless you need to assign a specific number to a given
device, Sybase recommends you use this method. If you do need an explicit
device number, use the parameter
"vdevno = N"
, where N is the device
number you want to use. If you specify a device number, that number must not
be in use by any other device on this server. Use
sp_helpdevice
to see what
device numbers have already been used.
If you find an existing database device is too small, you can make that device
larger using the
disk resize
command. This command takes the same “name”
and “size” parameters as
disk init
,except that the “size” parameter specifies how
much larger you want the device to be.
Note
Operating system constraints will limit how much larger you can make
any given device. For example, you cannot make a device on a UNIX raw
partition larger if you have already allocated the full defined size of that
partition.
For more information about
sp_helpdevice
and
disk init
command, see the
System Administration Guide and the Reference Manual.
For more information about device files, see the Performance and Tuning
Guide.