I'm playing with in-memory storage in oracle sql. I would like to compare the results of compression, I meant the amount of used space. For example, I'm running these queries:

```
ALTER TABLE RENTING INMEMORY MEMCOMPRESS FOR QUERY LOW(RETURN_DATE);

```

vs

```
ALTER TABLE RENTING INMEMORY MEMCOMPRESS FOR CAPACITY HIGH(RETURN_DATE);

```

Is there any easy way to check the size used by these compressions in SQL developer?

I found this article <https://blogs.oracle.com/in-memory/database-in-memory-compression>, there is a table containing 'space used' for each type of compression. This exactly what I am trying to do on my own. Thanks for any advices.