Query takes long time for first time

I have a table with 100 million records and another tables with many rows.
When I ran a query - it's takes about 1 minute to complete, but when I ran it again it takes less than 1 second to complete.
Why it is happening?
Thanks,
Tz.

Welcome to the forum.
When you post a question always provide your 4 digit Oracle version. Different versions have different functionality and this can affect your results and the advice you need.
For performance tuning questions see the FAQ (upper right corner of page) for the information needed for tuning requests.
>
When I ran a query
>
How did you run it? Did you use sql*plus, sqldeveloper, some other tool?
What command did you enter?
Using sql*plus you can get an execution plan for the query by
SQL> set serveroutput on
SQL> set autotrace traceonly
SQL> select * from emp;
Execution Plan
Plan hash value: 3956160932
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |    14 |   546 |     3   (0)| 00:00:01 |
|   1 | TABLE ACCESS FULL| EMP |    14 |   546 |     3   (0)| 00:00:01 |
SQL>

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