Question: So I just noticed one of my table have been dropped/deleted, I am using MySQL anyway I can trace or see logs of this?

I have no idea where to start look.

Answer: 
Create a `List<Integer>` with 12 values (1-12) 

```
List<Integer> list = new ArrayList<Integer>(12);
for(int i = 0; i < 12 ; i++){ list.add(i);}

```

and then shuffle it 

[`Collections.suffle(list)`](http://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#shuffle%28java.util.List%29)
```
long pattern = 0b111111;
Random r = new Random();
while (pattern != 0) {
    int n = r.nextInt(6);
    long mask = 1 << n;
    if ((pattern & mask) == 0) continue;
    pattern ^= mask;
    System.out.println("n = " + n);
}

```