content_image/996342.jpg
The measurement results of our tests are listed in Table 3-1. The allocated LFAREA that was used during both measurements was the same. There were 68,009 1 MB frames allocated in the run that used 1 MB frames (EXP_1M), while 33 2 GB and 425 1 MB frames were used during the run that used 2 GB frames (EXP_2G). The results showed 33 * 2048*1 MB + 425*1 MB frames = 68,009 1 MB frames allocated; therefore, an equal number of storage was used as LFAREA in both cases. 

<img src='content_image/996342.jpg'>

Although this measurement is not Db2 12 specific and was performed by using a Db2 11 environment, you can expect similar results when Db2 12 on a z13 is used with 2 GB page frames. 

## 3.4.2 Usage guidance and considerations 

The IEASYSxx LFAREA keyword specifies the amount of real storage to be made available for 1 MB and 2 GB large frames. All 1 MB and 2 GB frames are backed by contiguous 4 KB real storage frames, and are allocated from real storage as specified by the LFAREA keyword, as shown in the following example: 

LFAREA=(1M=88064,2G=40) 

As a result of this command, 88,064 1 MB frames and 40 2 GB frames (166 GB real storage) are allocated in the LFAREA at IBM MVS™ IPL time. 

