In some cases its handy to quickly be able to adjust your swap.
Here is a little trick i mostly use to do so.
First you can check your physical memory total :
grep MemTotal /proc/meminfo
To check your swap space total :
grep SwapTotal /proc/meminfo
So if you find yourself short in swap space , lets say for an Oracle installation.
You can safely expand your swap space like this
$>su – root
( You have to be root to be able to do this)
$>dd if=/dev/zero of=tmpswap bs=1k count=900000
( 900000 being 900 Megabytes )
$>chmod 600 tempswap
$>mkswap tempswap
$>swapon tempswap
Whenever you want to remove this extra swap space, use these commands :
$>su – root
$>swapoff tempswap
$>rm tempswap
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