How can I weigh my DB?

[ManicQin]

I have a problem and many ways to solve them in DB.
How can I weigh my solutions? (except building them and timing them)

[Sahir]

You don't need to build and measure them. Use your theoretical knowledge to evaluate solutions. If you aren't sure, ask an expert.

[ManicQin]

all the solutions has Logical advantages but I need to time my solutions, and to estimate the size on disk for every solution (with same amount of entries in each DB). Is there any advanced tool to help me do it instead of building the code (which will take toooooo much time i'm not lazy i'm efficient)