How to empty deleted files?

I want to delete some files,first I use X window to move to recycle,but it pop a windows,"no disk space",then I delete some files by using command #rm -r database , but I find my total free disk space don't change. Why? How to do it? Thanks

Hi.
1) If You delete open files, free space will not increase while this files will not close. It may be problem find what process was open file after file was removed. Reboot may resolve this problem
2) If file have hard links, free space will not increase, becouse file realy not removed. Removed only one link.
3) For some file result for ls -l and du -ks may be different.
( File with hole). So delete this file may not free space as you expected.
Regards.

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