Physical memory usage approaching 100%(96%)
is there some kind of memory-leak problems here?


No, the problem is more someone who does not know how SQL Server works.

SQL Server uses as much memory as feasible as cache for the database. Why not use it? So, what happens basically is that SQ LServer has a lot of data in memory in case it needs it, to avoid accessing the disc.

If you need more free memory, set a memory limit in SQL Server properties.

If oot - be happy, your memroy is used.