Fix busy handler implementation and update database handle name

Fix busy handler implementation and update database handle name

Use a more specific database handle name instead of using 'database', since this
may conflict with other global variables from external libraries by accident

Change-Id: If1cca3013dc8558d80722f3582c416243a4e41df
Signed-off-by: Abhay Agarwal <ay.agarwal@samsung.com>